SiT1534
Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Electrical Specifications
Table 1. Electrical Characteristics
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Programmable Output Frequency
1.00
32768.0
Hz
Factory programmed between 1 and 32.768 kHz in powers of 2
Frequency Tolerance[1]
F_tol
20
ppm
TA = 25°C, post reflow, includes underfill, Vdd: 1.5 V – 3.63 V
Frequency Stability[2]
F_stab
75
ppm
TA = -10°C to +70°C, Vdd: 1.5 V – 3.63 V
100
TA = -40°C to +85°C, Vdd: 1.5 V – 3.63 V
150
TA = -55°C to +85°C, Vdd: 1.5 V – 3.63 V
250
TA = -10°C to +70°C, Vdd: 1.2 V – 1.5 V
25°C Aging
-1
1
ppm
1st Year
Operating Supply Voltage
Vdd
1.2
3.63
V
TA = -10°C to +70°C
1.5
3.63
V
TA = -55°C to +85°C
Core Operating Current[3]
Idd
0.9
μA
TA = 25°C, Vdd: 1.8 V. No load
1.3
TA = -10°C to +70°C, Vdd max: 3.63 V. No load
1.4
TA = -55°C to +85°C, Vdd max: 3.63 V. No load
Output Stage Operating Current[3]
Idd_out
0.065
0.125
μA/Vpp
TA = -40°C to +85°C, Vdd: 1.5 V – 3.63 V. No load
Power-Supply Ramp
t_Vdd
Ramp
100
ms
Over temperature, 0 to 90%
Start-up Time[4]
t_start
300 + 1
period
ms
TA = 25°C ±10°C, valid output
500 + 1
period
TA = -55°C to +85°C, valid output
Commercial Temperature
T_use
-10
70
°C
Industrial Temperature
-40
85
°C
Extended Cold Industrial
Temperature
-55
85
°C
Notes:
1. Measured peak-to-peak. Tested with Agilent 53132A frequency counter. Due to the low operating frequency, the gate time must be ≥100 ms to ensure an accurate
frequency measurement.
2. Measured peak-to-peak. Inclusive of Initial Tolerance at 25°C, and variations over operating temperature, rated power supply voltage and load. Stability is
specified for two operating voltage ranges. Stability progressively degrades with supply voltage below 1.5 V.
3. Core operating current does not include output driver operating current or load current. To derive total operating current (no load), add core operating
current + (0.065 µA/V) * (output voltage swing).
4. Measured from the time Vdd reaches 1.5 V.
Features
◼ Factory programmable from 32.768 kHz down to 1 Hz
◼ <20 ppm frequency tolerance
◼ Smallest footprint in chip-scale (CSP): 1.5 x 0.8 mm
◼ Pin-compatible to 2.0 x 1.2 mm XTAL SMD package
◼ Ultra-low power: <1 µA
◼ Vdd supply range: 1.5 V to 3.63 V over -55°C to +85°C
◼ Supports low-voltage battery backup from a coin cell or
supercap
◼ Oscillator output eliminates external load caps
◼ Internal filtering eliminates external Vdd bypass cap
◼ NanoDrive™ programmable output swing for lowest power
◼ Pb-free, RoHS and REACH compliant
Applications
◼ Mobile Phones
◼ Tablets
◼ Health and Wellness Monitors
◼ Fitness Watches
◼ Sport Video Cams
◼ Wireless Keypads
◼ Ultra-Small Notebook PC
◼ Pulse-per-Second (pps) Timekeeping
◼ RTC Reference Clock
◼ Battery Management Timekeeping
Rev 1.41
November 23, 2020
www.sitime.com
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 2 of 13
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Table 1. Electrical Characteristics (continued)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Output Rise/Fall Time
tr, tf
100
200
ns
10-90% (Vdd), 15 pF load, Vdd = 1.5 V to 3.63 V
Output Clock Duty Cycle
DC
48
52
%
Output Voltage High
VOH
90%
V
Vdd: 1.5 V – 3.63 V. IOH = -10 μA, 15 pF
Output Voltage Low
VOL
10%
V
Vdd: 1.5 V – 3.63 V. IOL = 10 μA, 15 pF
Output Rise/Fall Time
tf, tf
200
ns
30-70% (VOL/VOH), 10 pF Load
Output Clock Duty Cycle
DC
48
52
%
AC-coupled Programmable
Output Swing
V_sw
0.20 to
0.80
V
SiT1534 does not internally AC-couple. This output description
is intended for a receiver that is AC-coupled. See Table 6 for
acceptable NanoDrive swing options
Vdd: 1.5 V – 3.63 V, 10 pF Load, IOH / IOL = ±0.2 μA.
DC-Biased Programmable
Output Voltage High Range
VOH
0.60 to
1.225
V
Vdd: 1.5 V – 3.63 V. IOH = -0.2 μA, 10 pF Load. See Table 5 for
acceptable VOH/VOL setting levels
DC-Biased Programmable
Output Voltage Low Range
VOL
0.35 to
0.80
V
Vdd: 1.5 V – 3.63 V. IOL = 0.2 μA, 10 pF Load. See Table 5 for
acceptable VOH/VOL setting levels
Programmable Output Voltage
Swing Tolerance
-0.055
0.055
V
TA = -40°C to +85°C, Vdd = 1.5 V to 3.63 V
Period Jitter
T_djitt
35
nsRMS
Cycles = 10,000, TA = 25°C, Vdd = 1.5 V – 3.63 V
Table 2. Pin Configuration (SMD) SMD Package (Top View)
Figure 1. Pin Assignments
(SMD)
Table 3. Pin Configuration (CSP) CSP Package (Top View)
GND
Vdd
CLK Out
GND 14
23
Figure 2. Pin Assignments
(CSP)
Pin
Symbol
I/O
Functionality
1
NC
No Connect,
don’t care
No Connect. Will not respond to any input signal. When the SiT1534
is used as an alternative to an XTAL, this pin is typically connected
to the receiving ICs X Out pin. In this case, the SiT1534 will not be
affected by the signal on this pin.
2
GND
Power Supply
Ground
Connect to ground.
3
CLK Out
OUT
Oscillator clock output. When the SiT1534 is used as an alternative
to an XTAL, the CLK Out is typically connected to the receiving ICs
X IN pin. No need for load capacitors. The output driver is
independent of capacitive loading.
4
Vdd
Power Supply
Connect to power supply 1.2 V ≤ Vdd ≤ 3.63 V. Under normal
operating conditions, Vdd does not require external
bypass/decoupling capacitor(s).
For more information about the internal power-supply filtering, see
the Power Supply Noise Immunity section in the detailed description.
Contact SiTime for applications that require a wider operating supply
voltage range.
Pin
Symbol
I/O
Functionality
1, 4
GND
Power Supply
Ground
Connect to ground. Acceptable to connect pin 1 and 4 together. Both
pins must be connected to GND.
2
CLK Out
OUT
Oscillator clock output. The CLK can drive into a Ref CLK input or into
an ASIC or chip-set’s 32kHz XTAL input. When driving into an ASIC
or chip-set oscillator input (X IN and X Out), the CLK Out is typically
connected directly to the XTAL IN pin. No need for load capacitors.
The output driver is intended to be insensitive to capacitive loading.
3
Vdd
Power Supply
Connect to power supply 1.2 V ≤ Vdd ≤ 3.63 V. Under normal
operating conditions, Vdd does not require external
bypass/decoupling capacitor(s). For more information about the
internal power-supply filtering, see the Power Supply Noise Immunity
section in the detailed description.
Contact SiTime for applications that require a wider operating supply
voltage range.
4
1
3
2
Vdd
CLK Out
NC
GND
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 3 of 13
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System Block Diagram
Ultra-Low
Power
PLL
Sustaining
Amp
Regulators Vdd
GND CLK Out
Prog
Divider
NC or
GND
MEMS Resonator
Prog
Control
Frequency
Adjust
Ultra-Low
Power Driver
Figure 3. SiT1534 Block Diagram
Table 4. Absolute Maximum Limits
Attempted operation outside the absolute maximum ratings cause permanent damage to the part.
Actual performance of the IC is only guaranteed within the operational specifications, not at absolute maximum ratings.
Parameter
Test Condition
Value
Unit
Continuous Power Supply Voltage Range (Vdd)
-0.5 to 3.63
V
Short Duration Maximum Power Supply Voltage (Vdd)
≤30 minutes
4.0
V
Continuous Maximum Operating Temperature Range
Vdd = 1.5 V - 3.63 V
105
°C
Short Duration Maximum Operating Temperature Range
Vdd = 1.5 V - 3.63 V, ≤30 mins
125
°C
Maximum Continuous Operating Life at Temperature Extreme
(meeting datasheet limits)
TA = -55°C, Continuous
Vdd = 1.8 V – 3.3 V ±10%
8
Hours
Human Body Model (HBM) ESD Protection
JESD22-A114
3000
V
Charge-Device Model (CDM) ESD Protection
JESD22-C101
750
V
Machine Model (MM) ESD Protection
JESD22-A115
300
V
Latch-up Tolerance
JESD78 Compliant
Mechanical Shock Resistance
Mil 883, Method 2002
10,000
g
Mechanical Vibration Resistance
Mil 883, Method 2007
70
g
2012 SMD Junction Temperature
150
°C
1508 CSP Junction Temperature
150
°C
Storage Temperature
-65°C to 150°C
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 4 of 13
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Description
The SiT1534 is the first programmable oscillator capable
of a frequency range between 32.768 kHz down to 1 Hz
for true pulse-per-second (PPS) operation. SiTime’s
silicon MEMS technology enables the smallest footprint
and chip-scale packaging. In the chip-scale package
(CSP), these devices reduce footprint by as much as
80% compared to existing 2.0 x 1.2 mm SMD XTAL
packages. Unlike XTALs, the SiT1534 oscillator output
enables greater component placement flexibility and
eliminates external load capacitors, thus saving additional
component count and board space. And unlike standard
oscillators, the SiT1534 features NanoDrive™, a factory
programmable output that reduces the voltage swing to
minimize power.
SiTime’s MEMS oscillators consist of MEMS resonators
and a programmable analog circuit. Our MEMS resonators
are built with SiTime’s unique MEMS First® process. A key
manufacturing step is EpiSeal® during which the MEMS
resonator is annealed with temperatures over 1000°C.
EpiSeal creates an extremely strong, clean, vacuum
chamber that encapsulates the MEMS resonator and
ensures the best performance and reliability. During
EpiSeal, a poly silicon cap is grown on top of the resonator
cavity, which eliminates the need for additional cap wafers
or other exotic packaging. As a result, SiTime’s MEMS
resonator die can be used like any other semiconductor
die. One unique result of SiTime’s MEMS First and
EpiSeal manufacturing processes is the capability to
integrate SiTime’s MEMS die with a SOC, ASIC,
microprocessor or analog die within a package to
eliminate external timing components and provide a highly
integrated, smaller, cheaper solution to the customer.
For applications that require XTAL resonator compatibility,
the SiT1534 is available in the 2.0 x 1.2 mm (2012)
package. Unlike XTAL resonators, SiTime’s silicon MEMS
oscillators require a power supply (Vdd) and ground
(GND) pin. Vdd and GND pins are conveniently placed
between the two large XTAL pins. When using the SiTime
Solder Pad Layout (SPL), the SiT1534 footprint is
compatible with existing 32 kHz XTALs in the 2012 SMD
package. Figure 4 shows the comparison between the
quartz XTAL footprint and the SiTime footprint.
Figure 4. SiT1534 Footprint Compatibility with Quartz
XTAL Footprint[5]
Frequency Stability
The SiT1534 is factory calibrated (trimmed) to guarantee
frequency stability to be less than 20 ppm at room
temperature and less than 100 ppm over the full -40°C to
+85°C temperature range. Unlike quartz crystals that
have a classic tuning fork parabola temperature curve
with a 25°C turnover point, the SiT1534 temperature
coefficient is extremely flat across temperature. This
device maintains less than 100 ppm frequency stability
over the full operating temperature range when the
operating voltage is between 1.5 and 3.63 V as shown in
Figure 5.
Functionality is guaranteed over the full supply voltage
range. However, frequency stability degrades below 1.5 V
and steadily degrades as it approaches 1.2 V due to the
internal regulator limitations.
When measuring the SiT1534 output frequency with a
frequency counter, it is important to make sure the
counter's gate time is >100 ms. The slow frequency of a 32
kHz clock will give false readings with faster gate times.
For applications that require a higher operating voltage
range, consider the SiT1544 with a 2.7 V to 4.5 V supply
voltage range.
Figure 5. SiTime vs. Quartz
Note:
5. On the SiTime device, X IN is not internally connected and will not respond to any signal. It is acceptable to connect to chipset X OUT.
Quartz SiTime
X OUT
X IN
Connect to
X OUT or NC
Clock Out
Connect to X IN
GND
Top View Top View
SiT153x Industrial Temp Specification
Quartz XTAL
-160 to -220 ppm Over Temp
Temperature (°C)
SiT1534 20 ppm Max @ 25°C
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 5 of 13
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Power Supply Noise Immunity
In addition to eliminating external output load capacitors
common with standard XTALs, this device includes special
power supply filtering and thus, eliminates the need for an
external Vdd bypass-decoupling capacitor. This feature
further simplifies the design and keeps the footprint as
small as possible. Internal power supply filtering is
designed to reject AC-noise greater than ±150 mVpp and
beyond 10 MHz frequency components.
Programmable Frequency
The SiT1534 is the first oscillator to feature a programmable
frequency range between 1 Hz and 32.768 kHz in powers
of two. Reducing the frequency significantly reduces the
output load current (C*V*F). For example, reducing the
frequency from 32.768 kHz to 10 kHz improves load
current by 70%. Similarly, reducing the output frequency
from 32.768 kHz down to 1 Hz reduces the load current
by more than 99%.
The Part Number Ordering shows the specific frequency
options.
NanoDrive™ Reduced Swing Output Voltage
For low-power applications that drive directly into a chip-
set’s XTAL input, the reduced swing output is ideal.
SiTime’s unique NanoDrive™, factory-programmable
output stage is optimized for low voltage swing to minimize
power and maintain compatibility with the downstream
oscillator input (X IN pin). The SiT1534 output swing is
factory programmed between 250 mV and 800 mV.
For DC-coupled applications, output VOH and VOL are
individually factory programmed. Contact SiTime for
programming support.
Power-up
The SiT1534 starts-up to a valid output frequency within
300 ms when operating at 32.768 kHz. For frequencies
less than 32.768 kHz, the start-up time can increase by an
additional clock period. The maximum start-up time over
temperature is 500 ms max over temperature plus a clock
period. For example, the maximum start-up time for a
256 Hz clock is 500 ms + 3.9 ms. To ensure the device
starts-up within the specified limit, make sure the power-
supply ramps-up in approximately 10 – 20 ms (to within
90% of Vdd). Start-up time is measured from the time Vdd
reaches 1.5 V. For applications that require start-up
between 1.2 V and 1.5 V, the start-up time will be
typically 50 ms longer.
SiT1534 NanoDrive™
Figure 6 shows a typical output waveform of the SiT1534
(into a 10 pF load) when factory programmed for a 0.70 V
swing and DC bias (VOH/VOL) for 1.8 V logic:
Example:
◼ NanoDrive™ part number coding: D14.
Example part number: SiT1534AI-J4-D14-32.768
◼ VOH = 1.1 V, VOL = 0.4 V (VSW = 0.70 V)
Figure 6. SiT1534AI-J4-D14-32.768
Output Waveform (10 pF load)
Table 5 shows the supported NanoDrive™ VOH, VOL factory
programming options.
Table 5. Acceptable VOH/VOL NanoDrive™ Levels
NanoDrive
VOH (V)
VOL (V)
Swing (mV)
Comments
D26
1.2
0.6
600 ±55
1.8 V logic compatible
D14
1.1
0.4
700 ±55
1.8 V logic compatible
D74
0.7
0.4
300 ±55
XTAL compatible
AA3
n/a
n/a
300 ±55
XTAL compatible
SiT1534 Full Swing LVCMOS Output
The SiT1534 can be factory programmed to generate full-
swing LVCMOS levels. Figure 5 shows the typical waveform
(Vdd = 1.8 V) at room temperature into a 15 pF load.
Figure 7. LVCMOS Waveform
(Vdd = 1.8 V) into 15 pF Load
Example:
◼ LVCMOS output part number coding is always DCC
Example part number: SiT1534AI-J4-DCC-32.768
VSW = 0.7
V
VOL = 0.4 V
VOH = 1.1 V
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
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Calculating Load Current
No Load Supply Current
When calculating no-load power for the SiT1534, the core
and output driver components need to be added. Since the
output voltage swing can be programmed for reduced swing
between 250 mV and 800 mV for ultra-low power
applications, the output driver current is variable and is a
function of the output voltage swing and the output
frequency. Therefore, no-load operating supply current is
broken into two sections; core and output driver. The real
benefit of NanoDrive™ is shown in the Total Supply Current
with Load calculation in the next section. The equation is
as follows:
Total Supply Current (no load) = Idd Core + Idd Output Driver
Example 1: Full-swing LVCMOS
◼ Vdd = 1.8 V
◼ Fout = 32.768 kHz
◼ Vout = Vdd
◼ Idd Output Driver: (3.5 pF)(Vout)(Fout) = 206 nA
◼ Idd Core = 900 nA (typ)
◼ Vout = Vdd = 1.8 V
Supply Current = 900 nA + 206 nA = 1.1 µA
Example 2: NanoDrive™ Reduced Swing
◼ Vdd = 1.8 V
◼ Fout = 32.768 kHz
◼ Vout (programmable) = Voh – Vol = 1.1 V - 0.6 V = 500 mV
◼ Idd Core = 900 nA (typ)
◼ Idd Output Driver: (3.5 pF)(Vout)(Fout) = 57 nA
Supply Current = 900 nA + 57 nA = 957 nA
Calculating Total Supply Current with Load
To calculate the total supply current, including the load, follow
the equation listed below. Note the 35% reduction in power
with NanoDrive™ as shown in Example 2. Reducing the
output clock frequency reduces the load current significantly,
as shown in Example 3.
Total Current = Idd Core + Idd Output Driver + Load Current
Example 1: Full-swing LVCMOS
◼ Vdd = 1.8 V
◼ Fout = 32.768 kHz
◼ Vout = Vdd
◼ Idd Core = 900 nA
◼ Idd Output Driver: (3.5 pF)(Vout)(Fout) = 206 nA
◼ Load Current: (10 pF)(1.8 V)(32.768 kHz) = 590 nA
Total Current with Load = 900 nA + 205 nA + 590 nA =1.5 µA
Example 2: NanoDrive™ Reduced Swing
◼ Vdd = 1.8 V
◼ Fout = 32.768 kHz
◼ Idd Core = 900 nA
◼ Vout (programmable): Voh – Vol = 1.2 V - 0.6 V = 600 mV
◼ Idd Output Driver: (3.5 pF)(Vout)(Fout) = 69 nA
◼ Load Current: (5 pF)(0.6 V)(32.768 kHz) = 98 nA
Total Current with Load = 900 nA + 69 nA + 98 nA = 1.07 µA
Example 3: LVCMOS and 1 Hz Output Frequency
◼ Same conditions as above example 1, but with output
frequency = 1 Hz. This will significantly reduce the
current consumption from the output stage and the load.
◼ Idd Core = 900 nA
◼ Idd Output Stage = (3.5 pF)(1.8 V)(1 Hz) = 6.3 pA
◼ 1 Hz Output Frequency impacts the load current as
shown below:
Load Current = CVF = (10 pF)(1.8 V)(1 Hz) = 18 pA
Total Supply Current with Load = Core Current + Output
Stage Current + Load Current = 900 nA + 0.0063 nA +
0.018 nA = 900 nA
Summary: Reducing the output frequency to 1 Hz virtually
eliminates the current consumption from the output stage
and load current.
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 7 of 13
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Typical Operating Curves
(TA = 25°C, Vdd = 1.8 V, unless otherwise stated)
Frequency Stability over Temperature
Figure 8. Initial Tolerance Histogram
Figure 9. Frequency Stability over Temperature
Figure 10. Core Current over Temperature
Figure 11. Output Stage Current over Temperature
Figure 12. 32.768 kHz Start-up Time
Temperature (°C)
Temperature (°C)
Time (sec)
Voltage (V)
Initial Tolerance (ppm)
TA = 25°C Post Reflow, No underfill
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 8 of 13
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Frequency Error (ppm)
Noise Injection Frequency (Hz)
Vdd 1.8 V
Vdd 3.3 V
Figure 13. Power Supply Noise Rejection
(±150 mV Noise)
Figure 14. NanoDrive™ Output Waveform
(VOH = 1.1 V, VOL = 0.4 V; SiT1534AI-J4-D14-32.768)
Figure 15. LVCMOS Output Waveform
(Vswing = 1.8 V, SiT1534AI-J4-DCC-32.768)
VSW = 0.7
V
VOL = 0.4 V
VOH = 1.1 V
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
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Dimensions and Patterns
Package Size – Dimensions (Unit: mm)[6]
Recommended Land Pattern (Unit: mm)
2.0 x 1.2 mm SMD
#1
#2
#3
#4
#3 #1
#4
#2
SiTime Only SPL
SiTime Alternate SPL with Larger Center Pads
0.3
(2x)
0.4
(2x)
0.55
0.4
0.65
1.4
(2x)
1.2
2.0
0.5(2x)
XTAL Compatible SPL
0.5(2x)
Note:
6. For marking guidance, see SiTime’s Manufacturing Notes, located on the SiTime web site in the Quality & Reliability section.
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 10 of 13
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Dimensions and Patterns
#1 #2
#4 #3
(soldermask openings shown with
dashed line around NSMD pad)
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 11 of 13
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Manufacturing Guidelines
1) No Ultrasonic Cleaning: Do not subject the SiT1534 to
an ultrasonic cleaning environment. Permanent
damage or long term reliability issues to the MEMS
structure may occur.
2) Applying board-level underfill (BLUF) to the device is
acceptable. It is reasonable to expect a slight shift in
the frequency and has been accounted for in the
frequency tolerance specification. Tested with UF3810,
UF3808, and FP4530 underfill.
3) CSP Reflow profile, per JESD22-A113D.
4) When designing-in the SiT1534 in the 2012 SMD
package into noisy, high EM environments, we
recommend the following design guidelines:
▪
Place oscillator as far away from EM noise
sources as possible (e.g., high-voltage switching
regulators, motor drive control).
▪
Route noisy PCB traces, such as digital data
lines or high di/dt power supply lines, away from
the SiTime oscillator.
▪
Add a low ESR/ESL, 0.1 uF to 1.0 uF ceramic
capacitor (X7R) to help filter high frequency
noise on the Vdd power-supply line. Place it as
close to the SiTime oscillator Vdd pin as
possible.
▪
Place a solid GND plane underneath the SiTime
oscillator to shield the oscillator from noisy traces
on the other board layers.
▪
For details, please refer to the PCB Layout
Guidelines in AN10006.
5) For additional manufacturing guidelines and marking/
tape-reel instructions, refer to SiTime Manufacturing
Notes.
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
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Ordering Information
Part number characters in blue represent the customer specific options. The other characters in the part number are fixed.
SiT1534A I - H 4 - D14 - 08.192 S
Temperature Range Tape and Reel
“C”: Commercial, -10 to 70°C
“I”: Industrial, -40 to 85°C
“D”: -55 to 85°C
Package Size
“S”: 8 mm Tape & Reel, 10 ku reel
“J”: 1.5 mm x 0.8 mm CSP
“D”: 8 mm Tape & Reel, 3 ku reel
“E”: 8 mm Tape & Reel, 1 ku reel
Frequency Stability
“5”: 75 ppm (-10 to 70°C only)
“4”: 100 ppm (-40 to 85°C only)
“6”: 150 ppm (-55 to 85°C only)
Output Voltage Setting
DCC: LVCMOS Output
NanoDrive™ Reduced Swing Output
Refer to Table 6 for output setting options
“H”: 2.0 mm x 1.2 mm SMD
Output Clock Frequency (kHz)
32.768
16.384
08.192
04.096
02.048
01.024
00.512
00.256
00.128
00.064
00.032
00.016
00.008
00.004
00.002
00.001
“A”: AC-coupled signal path
“D”: DC-coupled signal path
SiT1534A I - J 4 - D14 - 08.192 Q
Tape and Reel (“J” Package Size Only)
“S”: 8 mm Tape & Reel, 10 ku reel
“D”: 8 mm Tape & Reel, 3 ku reel
“E”: 8 mm Tape & Reel, 1 ku reel
CSP
SMD
Part
Family Silicon
Revision
Letter “Q”: 8 mm Tape & Reel, 5 ku reel
The following examples illustrate how to select the appropriate temp range and output voltage requirements:
Example 1: SiT1534AI-J4-D14-08.192
1)
Industrial temp & corresponding 100 ppm
frequency stability
2)
Output swing requirements:
a) Output frequency = 8.192 kHz
b) “D” = DC-coupled receiver
c) “1” = VOH = 1.1 V
d) “4” = VOL = 0.4 V
Example 2: SiT1534AC-J5-AA5-00.001
1)
Commercial temp & corresponding 75 ppm
frequency stability
2)
Output swing requirements:
a) Output frequency = 1 Hz
b) “A” = AC-coupled receiver
c) “A” = AC-coupled receiver
d) “5” = 500 mV swing
Table 6. Acceptable VOH/VOL NanoDrive™ Levels[7]
NanoDrive
VOH (V)
VOL (V)
Swing (mV)
Comments
D26
1.2
0.6
600 ±55
1.8 V logic compatible
D14
1.1
0.4
700 ±55
1.8 V logic compatible
D74
0.7
0.4
300 ±55
XTAL compatible
AA3
n/a
n/a
300 ±55
XTAL compatible
Note:
7. If these available options do not accommodate your application, contact Factory for other NanoDrive options.
SiT1534 Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Rev 1.41
Page 13 of 13
www.sitime.com
Table 7. Revision History
Version
Release Date
Change Summary
1.0
Sep 3, 2014
Rev 0.9 Preliminary to Rev 1.0 Production Release
Added start-up time at TA = 85°C
Added typical operating plots
Labeled 25C frequency stability as Frequency Tolerance
Added Manufacturing Guidelines section
1.1
Nov 25, 2014
Added 2012 SMD package design/mfg guidelines
1.2
Jan 5, 2016
Updated NanoDrive options
1.3
Apr 3, 2016
Added SiTime alternate landing pattern option
Updated Note 6
1.31
Jan 18, 2018
Updated SPL, page layout changes
1.4
Jun 1, 2018
Added -55 to 85°C temperature range option
Updated POD (Package Outline Drawing)
Updated logo and company address, other page layout changes
1.41
Nov 23, 2020
Formatting, rev table date format, TempFlat MEMS logo and trademarks update
Added Q-suffix to the Ordering table as CSP option only
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