EVB-ES1022SI - Altera - Product.Network

May 2014 Altera Corporation

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ES1022SI Datasheet

The ES1022SI IC provides four delay adjustable

sequenced outputs while monitoring an input voltage all

with a minimum of external components.

High performance DSP, FPGA, µP and various sub-

systems require input power sequencing for proper

functionality at initial power up and the ES1022SI

provides this function while monitoring the distributed

voltage for over and undervoltage compliance.

This IC operates over the +3.3V to +24V nominal voltage

range. It has a user adjustable time from UV and OV

voltage compliance to sequencing start via an external

capacitor when in auto start mode and adjustable time

delay to subsequent EN output signal via external

resistors.

Additionally, the ES1022SI provides I/O for sequencing

on and off operation (SEQ_EN) and for voltage window

compliance reporting (FAULT) over the +3.3V to +24V

nominal voltage range.

Easily daisy chained for more than 4 sequenced signals.

Altogether, the ES1022SI provides these adjustable

features with a minimum of external BOM. See Figure 1

for typical implementation.

Features

• Adjustable Delay to Subsequent EN Signal

• Adjustable Delay to Sequence Auto Start

• Adjustable Distributed Voltage Monitoring

• Under and Overvoltage Adjustable Delay to Auto

Start Sequence

• I/O Options: EN and SEQ_EN

• Voltage Compliance Fault Output

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Power Supply Sequencing

• System Timing Function

FIGURE 1. ES1022SI IMPLEMENTATION

EN_A

VIN

FAULT

SEQ_EN EN_B

EN_C

EN_D

3.3-24V

DC/DC

EN Vo1

Vo2

Vo3

V04

GND

TDLY_AB

TDLY_BC

TDLY_CD

TIME

Enpirion® Power Datasheet

ES1022SI Adjustable Quad Sequencer

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

Ordering Information

PART NUMBER (Note 1) PART MARKING

TEMP.

RANGE (°C)

PACKAGE

(Pb-free)

PKG.

DWG. #

ES1022SI* ES1022SI -40 to +85 14 Ld SOIC M14.15

EVB-ES1022SI Evaluation Platform

*Add “-T” suffix for tape and reel. Please refer to Packing and Marking Information: www.altera.com/support/reliability/packing/rel-

packing-and-marking.html

NOTES:

1. Altera Enpirion Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Altera Enpirion Pb-free

products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

10037 May 28, 2014 Rev A

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Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

Pinout

ES1022SI

(14 LD SOIC)

TOP VIEW

Pin Descriptions

Number PIN NAME FUNCTION DESCRIPTION

1 EN_D EN output D. Active high open drain sequenced output. Sequenced on after EN_C and first output to sequence off. Pulls low

with VIN < 1V.

2 EN_C EN output C. Active high open drain sequenced output. Sequenced on after EN_B and sequenced off after EN_D. Pulls low

with VIN < 1V.

3 EN_B EN output B. Active high open drain sequenced output. Sequenced on after EN_A and sequenced off after EN_C. Pulls low

with VIN < 1V.

4 EN_A EN output A. Active high open drain sequenced output. Sequenced on after CTIME period and sequenced off after EN_B. Pulls

low with VIN < 1V.

5 OV The voltage on this pin must be under its 1.22V Vth or the four EN outputs will be immediately pulled down.

6 UV The voltage on this pin must be over its 1.22V Vth or the four EN outputs will be immediately pulled down.

7 GND IC ground.

8 FAULT The VIN voltage when not within the desired UV to OV window will cause FAULT to be released to be pulled high to a voltage

equal to or less than VIN via an external resistor.

9 SEQ_EN This pin provides a sequence on signal input with a high input. Internally pulled high to ~2.4V.

10 TIME This pin provides a 2.6µA current output so that an adjustable VIN valid to sequencing on and off start delay period is created

with a capacitor to ground.

11 TDLY_AB A resistor connected from this pin to ground determines the time delay from EN_A being active to EN _B being active on turn-

on and also going inactive on turn-off via the SEQ_EN input.

12 TDLY_BC A resistor connected from this pin to ground determines the time delay from EN_B being active to EN _C being active on turn-

on and also going inactive on turn-off via the SEQ_EN input.

13 TDLY_CD A resistor connected from this pin to ground determines the time delay from EN_C being active to EN _D being active on turn-

on and also going inactive on turn-off via the SEQ_EN input.

14 VIN IC Bias Pin Nominally 3.3V to 24V

This pin requires a 1μF decoupling capacitor close to IC pin.

EN_D

EN_C

EN_B

EN_A

VIN

TDLY_CD

TDLY_BC

TDLY_AB

TIME

SEQ_EN

FAULT

GND

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

Absolute Maximum Ratings Thermal Information

VIN, EN, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27V, to -0.3V

TIME, TDLY_AB, TDLY_BC, TDLY_CD, UV, OV .+6V, to -0.3V

SEQ_EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN+0.3V, to -0.3V

EN Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C

Supply Voltage Range (Nominal) . . . . . . . . . . . . . . 3.3V to 24V

Thermal Resistance (Typical, Note 2) . . . . . . . . . . . θJA (°C/W)

14 Ld SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Maximum Junction Temperature (Plastic Package) +125°C

Maximum Storage Temperature Range . . . . . . -65°C to +150°C

Maximum Lead Temperature (Soldering 10s) . . . . . . . . +300°C

(SOIC Lead Tips Only)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of

the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

2. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air.

Electrical Specifications Nominal VIN = 3.3V to +24V, TA = TJ = -40°C to+85°C, Unless Otherwise Specified.

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

UV AND OV INPUTS

UV/OV Rising Threshold VUVRvth 1.16 1.21 1.28 V

UV/OV Falling Threshold VUVFvth 1.06 1.10 1.18 V

UV/OV Hysteresis VUVhys VUVRvth - VUVFvth -104-mV

UV/OV Input Current IUV -10-nA

TIME, EN OUTPUTS

TIME Pin Charging Current ITIME -2.6-μA

TIME Pin Threshold VTIME_VTH 1.9 2.0 2.25 V

Time from VIN Valid to EN_A tVINSEQpd SEQ_EN = high, CTIME = open - 30 - μs

tVINSEQpd_10 SEQ_EN = high, CTIME = 10nF - 7.7 - ms

tVINSEQpd500 SEQ_EN = high, CTIME = 500nF - 435 - ms

Time from VIN Invalid to Shutdown tshutdown UV or OV to simultaneous shutdown - - 1 μs

EN Output Resistance REN IEN = 1mA -100- Ω

EN Output Low Vol IEN = 1mA -0.1- V

EN Pull-down Current Ipulld EN = 1V 10 15 - mA

Delay to Subsequent EN Turn-on/off tdel_120 RTX = 120kΩ155 195 240 ms

tdel_3 RTX = 3kΩ3.5 4.7 6 ms

tdel_0 RTX = 0Ω-0.5-ms

SEQUENCE EN AND FAULT I/O

VIN Valid to FAULT Low tFLTL 15 30 50 μs

VIN Invalid to FAULT High tFLTH -0.5- μs

FAULT Pull-down Current FAULT = 1V 10 15 - mA

SEQ_EN Pull-up Voltage VSEQ SEQ_EN open - 2.4 - V

SEQ_EN Low Threshold Voltage VilSEQ_EN --0.3V

SEQ_EN High Threshold Voltage VihSEQ_EN 1.2 - - V

Delay to EN_A Deasserted tSEQ_EN_ENA SEQ_EN low to EN_A low - 0.2 1 μs

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Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

Functional Block Diagram

Functional Description

ES1022SI provides four delay adjustable sequenced outputs while monitoring a single distributed voltage in the nominal

range of 3.3V to 24V for both under and overvoltage. Only when the voltage is in compliance will the ES1022SI initiate the

pre-programmed A-B-C-D sequence of the EN outputs. Although this IC has a bias range of 3.3V to 24V it can monitor any

voltage >1.22V via the external divider if a suitable bias voltage is otherwise provided.

During initial bias voltage (VIN) application the ES1022SI EN outputs are held low once VIN =1V. Once V

IN > the V bias

power on reset threshold (POR) of 2.8V, VIN is constantly monitored for compliance via the input voltage resistor divider

and the voltages on the UV and OV pins and reported by the FAULT output. Internally, voltage regulators generate 3.5V

and 1.17V ±5% voltage rails for internal usage once VIN > POR. Once UV > 1.22V and with the SEQ_EN pin high or open,

the auto sequence of the four EN outputs begins as the TIME pin charges its external capacitor with a 2.6µA current source.

The voltage on TIME is compared to the internal reference (VTIME_VTH) comparator input and when greater than VTIME_VTH

the EN_A is released to go high via an external pull-up resistor or a pull-up in a DC/DC convertor EN input, for example.

The time delay generated by the external capacitor is to assure continued voltage compliance within the programmed

limits, as during this time any OV or UV condition will halt the start-up process. TIME cap is discharged once VTIME_VTH is

met.

BIAS

IC Supply Current IVIN_3.3V VIN = 3.3V - 191 - μA

IVIN_12V VIN = 12V - 246 400 μA

IVIN_24V VIN = 24V - 286 - μA

VIN Power On Reset VIN_POR VIN low to high - 2.3 2.8 V

Electrical Specifications Nominal VIN = 3.3V to +24V, TA = TJ = -40°C to+85°C, Unless Otherwise Specified. (Continued)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

VIN VOLTAGE

1.17V

INTERNAL VOLTAGE

REGULATOR

VIN (2.8V MIN - 27V MAX)

2.0V VIN POR

3.5V

LOGIC

VIN

PROGRAMMABLE

DELAY TIMER

VTIME_VTH

2.6μA

VIN

TDLY_AB TDLY_BC TDLY_CD

EN_A

EN_B

EN_C

EN_D

TIME

GND

FAULT

SEQ_EN

VREF

30μs

REFERENCE

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

Once EN_A is active (released high on the ES1022SI) a counter is started and using the resistor on TDLY_AB as a timing

component a delay is generated before EN_B is activated. At this time, the counter is restarted using the resistor on

TDLY_BC as its timing component for a separate timed delay until EN_C is activated. This process is repeated for the

resistor on TDLY_CD to complete the A-B-C-D sequencing order of the EN outputs. At any time during sequencing if an

OV or UV event is registered, all four EN outputs will immediately return to their low reset state. CTIME is immediately

discharged after initial ramp up thus waiting for subsequent voltage compliance to restart. Once sequencing is complete,

any subsequently registered UV or OV event will trigger an immediate and simultaneous reset of all EN outputs.

On the ES1022SI, enabling of on or off sequencing can also be signaled via the SEQ_EN input pin once voltage

compliance is met. Initially, the SEQ_EN pin should be held low and released when sequence start is desired. SEQ_EN is

internally pulled high and sequencing is enabled unless it is pulled low. The on sequence of the EN outputs is as

previously described. The off sequence is D off, then C off, then B off and finally A off. Once SEQ_EN is signaled low, the

TIME cap is charged to 2V once again. Once this Vth is reached, EN_D transitions to its reset state and CTIM is

discharged. A delay and subsequent sequence off is then determined by TDLY_CD resistor to EN_C. Likewise, a delay to

EN_B and then EN_A turn-off is determined by TDLY_BC and TDLY_AB resistor values respectively.

The FAULT signal is always valid at operational voltages and can be used as justification for SEQ_EN release or even

controlled with an RC timer for sequence on.

Programming the Under and Overvoltage Limits

When choosing resistors for the divider remember to keep the current through the string bounded by power loss at the top

end and noise immunity at the bottom end. For most applications, total divider resistance in the 10kΩ to1000kΩ range is

advisable with high precision resistors being used to reduce monitoring error. Although for the ES1022SI, two dividers of

two resistors each can be employed to separately monitor the OV and UV levels for the VIN voltage. We will discuss using a

single three resistor string for monitoring the VIN voltage, referencing Figure 1. In the three resistor divider string with Ru

(upper), Rm (middle) and Rl (lower), the ratios of each in combination to the other two is balanced to achieve the desired

UV and OV trip levels. Although this IC has a bias range of 3.3V to 24V, it can monitor any voltage >1.22V.

The ratio of the desired overvoltage trip point to the internal reference is equal to the ratio of the two upper resistors to the

lowest (gnd connected) resistor.

The ratio of the desired undervoltage trip point to the internal reference voltage is equal to the ratio of the uppermost

(voltage connected) resistor to the lower two resistors.

These assumptions are true for both rising (turn-on) or falling (shutdown) voltages.

The following is a practical example worked out. For detailed equations on how to perform this operation for a given

supply requirement please see the next section.

1. Determine if turn-on or shutdown limits are preferred. In this example, we will determine the resistor values based on

the shutdown limits.

2. Establish lower and upper trip level: 12V ±10% or 13.2V (OV) and 10.8V (UV)

3. Establish total resistor string value: 100kΩ, Ir = divider current

4. (Rm+Rl) x Ir = 1.1V @ UV and Rl x Ir = 1.2V @ OV

5. Rm+Rl = 1.1V/Ir @ UV = Rm+Rl = 1.1V/(10.8V/100kΩ) = 10.370kΩ

6. Rl = 1.2V/Ir @ OV = Rl = 1.2V/(13.2V/100kΩ) = 9.242kΩ

7. Rm = 10.370kΩ - 9.242kΩ = 1.128kΩ

8. Ru = 100kΩ - 10.370kΩ = 89.630kΩ

9. Choose standard value resistors that most closely approximate these ideal values. Choosing a different total divider

resistance value may yield a more ideal ratio with available resistor’s values.

In our example, with the closest standard values of Ru = 90.9kΩ, Rm = 1.13kΩ and Rl = 9.31kΩ, the nominal UV falling and

OV rising will be at 10.9V and 13.3V respectively.

Programming the EN Output Delays

The delay timing between the four sequenced EN outputs are programmed with four external passive components. The

delay from SEQ_EN being valid to EN_A is determined by the value of the capacitor on the TIME pin to GND. The external

TIME pin capacitor is charged with a 2.6µA current source. Once the voltage on TIME is charged up to the internal

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Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

reference voltage, (VTIME_VTH) the EN_A output is released out of its reset state. The capacitor value for a desired delay (±10%)

to EN_A once VIN and SEQ_EN where applicable has been satisfied is determined by:

CTIME = tVINSEQpd/770kΩ

Once EN_A reaches VTIME_VTH, the TIME pin is pulled low in preparation for a sequenced off signal via SEQ_EN. At this

time, the sequencing of the subsequent outputs is started. EN_B is released out of reset after a programmable time, then

EN_C, then EN_D, all with their own programmed delay times.

The subsequent delay times are programmed with a single external resistor for each EN output providing maximum

flexibility to the designer through the choice of the resistor value connected from TDLY_AB, TDLY_BC and TDLY_CD pins

to GND. The resistor values determine the charge and discharge rate of an internal capacitor comprising an RC time

constant for an oscillator whose output is fed into a counter generating the timing delay to EN output sequencing.

The RTX value for a given delay time is defined as:

RTX = tdel/1667nF

An Advanced Tutorial on Setting UV and OV Levels

This section discusses in additional detail the nuances of setting the UV and OV levels, providing more insight into the

ES1022SI than the earlier text.

The following equation set can alternatively be used to work out ideal values for a 3 resistor divider string of Ru, Rm and Rl.

These equations assume that VREF is the center point between VUVRvth and VUVFvth (i.e. (VUVRvth + VUVFvth)/2 = 1.17V), Iload

is the load current in the resistor string (i.e. VIN /(Ru + Rm + Rl)), VIN is the nominal input voltage and Vtol is the acceptable

voltage tolerance, such that the UV and OV thresholds are centered at VIN ± Vtol. The actual acceptable voltage window will

also be affected by the hysteresis at the UV and OV pins. This hysteresis is amplified by the resistor string such that the

hysteresis at the top of the string is:

Vhys = VUVhys x VOUT/VREF

This means that the VIN ± Vtol thresholds will exhibit hysteresis resulting in thresholds of VIN + Vtol ± Vhys/2 and VIN

- Vtol ± Vhys/2.

There is a window between the VIN rising UV threshold and the VIN falling OV threshold where the input level is

guaranteed not to be detected as a fault. This window exists between the limits VIN ± (Vtol - Vhys/2). There is an

extension of this window in each direction up to VIN ± (Vtol + Vhys/2), where the voltage may or may not be detected

as a fault, depending on the direction from which it is approached. These two equations may be used to determine the

required value of Vtol for a given system. For example, if VIN is 12V, Vhys = (0.1 x 12)/1.17 = 1.03V. If VIN must remain

within 12V ± 1.5V, Vtol = 1.5 - 1.03/2 = 0.99V. This will give a window of 12 ±0.48V where the system is guaranteed not

to be in fault and a limit of 12 ±1.5V beyond which the system is guaranteed to be in fault.

It is wise to check both these voltages, for if the latter is made to tight, the former will cease to exist. This point comes when

Vtol < Vhys/2 and results from the fact that the acceptable window for the OV pin no longer aligns with the acceptable

window for the UV pin. In this case, the application will have to be changed such that UV and OV are provided separate

resistor strings. In this case, the UV and OV thresholds can be individually controlled by adjusting the relevant divider.

The previous example will give voltage thresholds of:

with VIN rising

UVr = VIN - Vtol + Vhys/2 = 11.5V and

OVr = VIN + Vtol + Vhys/2 = 13.5V

with VIN falling

Ovf = VIN + Vtol - Vhys/2 = 12.5V and

UVf = VIN - Vtol - Vhys/2 = 10.5V.

So with a single three resistor string, the resistor values can be calculated as:

Rl = (VREF/Iload) (1 - Vtol/VIN)

Rm = 2(VREF x Vtol)/(VIN x Iload)

Ru = 1/Iload x (VIN - VREF (1+Vtol/VIN))

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

For the above example, with Vtol = 0.99V, assuming a 100µA Iload at VIN = 12V:

Rl = 10.7kΩ

Rm = 1.9kΩ

Ru = 107.3kΩ

Typical Performance Curves

FIGURE 4. UV/OV RISING THRESHOLD FIGURE 5. VIN CURRENT

FIGURE 2. ES1022SI OPERATIONAL DIAGRAM

EN OUTPUTS ABCD

FAULT

ABCD

SEQ_EN

TIME

FIGURE 3. ES1022SI FAULT OPERATIONAL DIAGRAM

UNDERVOLTAGE

OVERVOLTAGE

MONITORED VOLTAGE

FAULT OUTPUT

tFLTH

LIMIT

RAMPING UP AND DOWN

tFLTH

tFLTL

<tFLTH

1.198

1.199

1.200

1.201

1.202

1.203

1.204

1.205

1.206

1.207

1.208

-40 -10 0 25 60 85 100

TEMP (°C)

UV/OV THRESHOLD (V)

VIN = 2.5V

VIN = 12V

VIN = 24V

150

170

190

210

230

250

270

290

310

-40 -10 0 25 60 85 100

TEMP (°C)

IVIN (µA)

VIN = 12V

VIN = 24V

VIN = 2.5V

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Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

Applications Usage

Using the EVB-ES1022SI Platform

The EVB-ES1022SI platform is the primary evaluation board for this family of sequencers. See Figure 15 for

photograph and schematic. The evaluation board is shipped with an ES1022SI mounted in the left position and with

the other device variants loose packed. In the following discussion, test points names are bold on initial occurrence for

identification.

The VIN test point is the chip bias and can be biased from 3.3V to 24V. The VHI test point is for the EN and FAULT

pull-up voltage which are limited to a maximum of 24V independent of VIN. The UV/OV resistor divider is set so that

a nominal 12V on the VMONITOR test point is compliant and with a rising OV set at 13.2V and a falling UV set at

10.7V. These three test points (VIN,VHI and VMONITOR) are brought out separately for maximum flexibility in

evaluation.

VMONITOR ramping up and down through the UV and OV levels will result in the FAULT output signaling the out

of bound conditions by being released to pull high to the VHI voltage as shown in Figures 6 and 7.

Once the voltage monitoring FAULT is resolved and where applicable, the SEQ_EN is satisfied, sequencing of the

EN_X outputs begins. When sequence enabled the EN_A, EN_B, EN_C and lastly EN_D are asserted in that order and

when SEQ_EN is disabled the order is reversed. See Figures 8 and 9 demonstrating the sequenced enabling and

disabling of the EN outputs. The timing between EN outputs is set by the resistor values on the TDLY_AB, TDLY_BC,

TDLY_CD pins as shown. Figure 10 illustrates the timing from either SEQ_EN and/or VMONITOR being valid to

EN_A being asserted with a 10nF TIME capacitor. Figure 11 shows that EN_X outputs are pulled low even before VIN

= 1V. This is critical to ensure that a false EN is not signaled. Figure 12 shows the time from SEQ_EN transition with

the voltage ramping across the TIME capacitor to TIME Vth being met. This results in the immediate pull down of the

TIME pin and simultaneous EN_A enabling.

FIGURE 6. VMONITOR RISING TO FAULT FIGURE 7. VMONITOR FALLING TO FAULT

FAULT OUTPUT

VMON RISING

VMON > UV

VMON > OV

LEVEL

VMON FALLING

VMON > OV

VMON > UV

LEVEL

FAULT OUTPUT

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

FIGURE 8. EN_X TO EN_X ENABLING FIGURE 9. EN_X TO EN_X DISABLING

FIGURE 10. VIN/SEQ_EN VALID TO EN_A FIGURE 11. EN AS VIN RISES

FIGURE 12. SEQ_EN TO EN_A FIGURE 13. OV AND UV TRANSIENT IMMUNITY

RTDLY_CD = 120k

DELAY = 196ms

RTDLY_BC = 51k

RTDLY_AB = 3k

DELAY = 5ms

DELAY = 86ms

RTDLY_CD = 120k

DELAY = 196ms

RTDLY_AB = 3k

DELAY = 5ms

RTDLY_BC = 51k

DELAY = 86ms

CTIME = 10nF

DELAY = 8.5ms

1V/DIV 10ms/DIV

VIN RISING

EN OUTPUTS TRACKS VIN TO < 0.8V

EN_A

TIME

SEQ_EN

0.5V/DIV

8µs/DIV

FAULT = LOW

VMONITOR OV

VMONITOR UV

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Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

Application Recommendations

Best practices VIN decoupling is required, a 1μF capacitor is recommended.

Coupling from the EN_X pins to the sensitive UV and OV pins can cause false OV/UV events to be detected. This is

relevant due to the EN_A and OV pins being adjacent. This coupling can be reduced by adding a ground trace

between UV and the EN/FAULT signals, as shown in Figure 14. The PCB traces on OV and UV should be kept as small

as practical and the EN_X and FAULT traces should ideally not be routed under/over the OV/UV traces on different

PCB layers unless there is a ground or power plane in between. Other methods that can be used to eliminate this issue

are by reducing the value of the resistors in the network connected to UV and OV (R2, R3, R5 in Figure 15) or by

adding small decoupling capacitors to OV and UV (C2 and C7 in Figure 15). Both these methods act to reduce the AC

impedance at the nodes, although the latter method acts to filter the signals which will also cause an increase in the

time that a UV/OV fault takes to be detected.

When the ES1022SI is implemented on a hot swappable card that is plugged into an always powered passive back

plane an RC filter is required on the VIN pin to prevent a high dv/dt transient. With the already existing 1μF decoupling

capacitor the addition of a small series R (>50Ω) to provide a time constant >50μs is all that is necessary.

FIGURE 14. LAYOUT DETAIL OF GND BETWEEN PINS 4 AND 5

PIN 4

PIN 5

GND

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

TABLE 1. EVB-ES1022SI LEFT CHANNEL COMPONENT LISTING

COMPONENT

DESIGNATOR COMPONENT FUNCTION COMPONENT DESCRIPTION

U1 ES1022SI, Quad Under/Overvoltage Sequencer Altera Enpirion, ES1022SI, Quad Under/Overvoltage Sequencer

R3 UV Resistor for Divider String 1.1kΩ 1%, 0603

R2 VMONITOR Resistor for Divider String 88.7kΩ 1%, 0603

R5 OV Resistor for Divider String 9.1kΩ 1%, 0603

C1 CTIME Sets Delay from Sequence Start to First EN 0.01μF, 0603

R1 RTDLY_CD Sets Delay from Third to Fourth EN 120kΩ 1%, 0603

R9 RTDLY_AB Sets Delay from First to Second EN 3.01kΩ 1%, 0603

R7 RTDLY_BC Sets Delay from Second to Third EN 51kΩ 1%, 0603

R4, R6, R8, R10, R11 EN_X and FAULT Pull-up Resistors 4kΩ 10%, 0402

C3 Decoupling Capacitor 1μF, 0603

FIGURE 15. EVB-ES1022SI PHOTOGRAPH AND SCHEMATIC OF LEFT CHANNEL

TIMING

COMPONENTS

RESISTORS

UV/OV SET

RESISTORS

PULL-UP

EN_A

EN_B

EN_C

EN_D

ES1022SI

TDLY_CD

TDLY_BC

TDLY_AB

10037 May 28, 2014 Rev A

Page 13

Enpirion Power Datasheet ES1022SI Adjustable Quad SequencerMay 2014 Altera Corporation

Revision History

The table lists the revision history for this document.

DATE REVISION CHANGE

May, 2014 1.0 Initial Release.

10037 May 28, 2014 Rev A

Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer May 2014 Altera Corporation

Page 14

Small Outline Plastic Packages (SOIC)

NOTES:

1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publica-

tion Number 95.

2. Dimensioning and tolerancing per ANSI Y14.5M-1982.

3. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold

flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per

side.

4. Dimension “E” does not include interlead flash or protrusions. Interlead flash

and protrusions shall not exceed 0.25mm (0.010 inch) per side.

5. The chamfer on the body is optional. If it is not present, a visual index feature

must be located within the crosshatched area.

6. “L” is the length of terminal for soldering to a substrate.

7. “N” is the number of terminal positions.

8. Terminal numbers are shown for reference only.

9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the

seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch).

10. Controlling dimension: MILLIMETER. Converted inch dimensions are not nec-

essarily exact.

INDEX

AREA

123

-B-

0.25(0.010) C AMBS

-A-

-C-

SEATING PLANE

0.10(0.004)

h x 45o

H0.25(0.010) BM M

M14.15 (JEDEC MS-012-AB ISSUE C)

14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE

SYMBOL

INCHES MILLIMETERS

NOTESMIN MAX MIN MAX

A 0.0532 0.0688 1.35 1.75 -

A1 0.0040 0.0098 0.10 0.25 -

B 0.013 0.020 0.33 0.51 9

C 0.0075 0.0098 0.19 0.25 -

D 0.3367 0.3444 8.55 8.75 3

E 0.1497 0.1574 3.80 4.00 4

e 0.050 BSC 1.27 BSC -

H 0.2284 0.2440 5.80 6.20 -

h 0.0099 0.0196 0.25 0.50 5

L 0.016 0.050 0.40 1.27 6

N14 147

a0o8o0o8o-

Rev. 0 12/93

10037 May 28, 2014 Rev A