74AHCT594
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74AHCT594
8-BIT SHIFT REGISTER WITH 8-BIT OUTPUT REGISTER
Description
The 74AHCT594 is an advanced high speed CMOS device that is
designed to be pin compatable with 74LS low power Schottky types.
An eight bit shift register accepts data from the serial input (DS) on
each positive transition of the shift register clock (SHCP). When
asserted low the shift register reset function (SHR) sets all shift
register values to zero and is independent of all clocks. Also when
asserted low, the storage register reset function (STR) sets all shift
register values to zero and is independent of all clocks.
Data from the input serial shift register is placed in the output register
with a rising pulse on the storages resister clock (STCP). The
storage resister includes output Q7S which is used for cascading
information between devices. As the information moves into the
storage register, it is asserted on the push-pull outputs Q0-Q7.
All registers capture data on rising edge and change output on the
falling edge. If both clocks are connected together, the input shift
register is always one clock cycle ahead of the output register.
Features
Wide Supply Voltage Range from 4.5V to 5.5V
Sinks or sources 8mA at VCC = 4.5V
CMOS low power consumption
Schmitt Trigger Action at All Inputs
Inputs accept up to 6.0V
ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115-A)
Exceeds 2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
Latch-Up Exceeds 250mA per JESD 78, Class II
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
1
3
2
4
5
6
7
Q1
Q3
Q2
Q6
8
Q0
DS
SHCP
SHR
Vcc
(Top View)
SO-16
GND
13
14
12
11
10
9
Q5
Q7
Q7S
STCP
15
16
Q4 STR
TSSOP-16/
Applications
General Purpose Logic
Serial to Parallel Data conversion
Capture and hold data for extended periods of time.
Allow simple serial bit streams from a microcontroller to control as
many peripheral lines as needed.
Wide array of products such as:
Computer Peripherals
Appliances
Industrial control
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- an d Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Click here for ordering information, located at the end of datasheet
74AHCT594
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74AHCT594
Pin Descriptions
Pin Number Pin Name Description
1 Q1 Parallel Data Output 1
2 Q2 Parallel Data Output 2
3 Q3 Parallel Data Output 3
4 Q4 Parallel Data Output 4
5 Q5 Parallel Data Output 5
6 Q6 Parallel Data Output 6
7 Q7 Parallel Data Output 7
8 GND Ground
9 Q7S Serial Data Output
10 SHR Shift Register Reset active low
11 SHCP Shift Register Clock Input
12 STCP Storage Register Clock Input
13 STR Storage Register Reset active low
14 DS Serial Data input
15 Q0 Parallel Data Output 0
16 Vcc Supply Voltage
Functional Diagram
Logic Diagram
R
DQ
CP
FF0
DQ
CP
LATCH
STAGE 0
DQ
STAGES 1 TO 6
R
DQ
CP
FF7
DQ
CP
LATCH
STAGE 7
DS
SHCP
SHR
STCP
STR
Q0 Q1 Q2 Q3 Q5
Q4 Q6 Q7
RR
74AHCT594
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74AHCT594
Functional Description and Timing Diagram
Control Input Output Function
SHR STR SHCP STCP DS Q7S Qn
L X X X X L NC Clear Shift Register
X L X X X NC L Clear Storage Register
H X L H or L Q6S NC Loads DS into shift register stage 0. All QS shifted
H H X X NC Qs
Contents of shift register moved to starge register all QS -> QN
H H H or L Q6S QnS Shift Register one pulse count ahead of storage register.
H=HIGH voltage state
L=LOW voltage state
=LOW to HIGH transition
X= don’t care – high or low (not floating)
NC= No change
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
ESD HBM Human Body Model ESD Protection 2 KV
ESD CDM Charged Device Model ESD Protection 1 KV
ESD MM Machine Model ESD Protection 200 V
VCC Supply Voltage Range -0.5 to +7.0 V
VI Input Voltage Range -0.5 to +7.0 V
Vo Voltage applied to output in high or low state -0.3 to VCC +0.5 V
IIK Input Clamp Current VI< -0.5V -20 mA
IOK Output Clamp Current VO<-0.5V -20 mA
IOK Output Clamp Current VO> VCC +0.5V 20 mA
IO Continuous output current ±25 mA
ICC Continuous current through Vcc 75 mA
IGND Continuous current through GND -75 mA
TJ Operating Junction Temperature -40 to +150 °C
TSTG Storage Temperature -65 to +150 °C
PTOT Total Power Dissipation 500 mW
Notes: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device
operation should be within recommend values.
74AHCT594
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Recommended Operating Conditions (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Max Unit
VCC Supply Voltage 4.5 5.5 V
VI Input Voltage 0 5.5 V
VO Output Voltage Active Mode 0 VCC V
t/V Input transition Rise or Fall Rate VCC = 4.5V to 5.5V 20 ns/V
TA Operating Free-Air Temperature -40 +125 °C
Note: 5. Unused inputs should be held at VCC or Ground.
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Test Conditions VCC TA = +25°C TA = -40°C to +85°C TA = -40°C to +125°C Unit
Min Typ Max Min Max Min Max
VIH High-level Input
Voltage 4.5V to 5.5V 2.0 2.0 2.0 V
VIL Low-level input
voltage 4.5V to 5.5V 0.8 0.8 0.8 V
VOH High Level
Output Voltage IOH = -50μA 4.5V 4.4 4.5
4.4 4.4 V
IOH = -8mA 4.5V 3.94
3.80 3.70
VOL Low-level
Output Voltage IOL = 50μA 4.5V 0 0.1 0.1 0.1 V
IOL = 8mA 4.5V 0.36 0.44 0.55
II Input Current VI = GND or 5.5V 0V to 5.5V 0.1 ±0.1 ± 1 ± 2 μA
ICC Supply Current VI = GND or VCC
IO = 0 5.5V 4.0 40 80 μA
∆ICC Additional
Supply Current
per Input
VI = VCC -2.1V
IO = 0 4.5V to 5.5V 1.35 1.5 1.5 mA
Ci Input
Capacitance Vi = VCC or GND 5.5V 3.5 10 10 10 pF
74AHCT594
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Switching Characteristics
Symbol /
Parameter Pins Test Conditions VCC TA = +25°C -40°C to +85°C -40°C to +125°C Unit
Min Typ Max Min Max Min Max
fMAX
Maximum
Frequency
SHCP or
STCP Figure 2 CL = 15pF 4.5V to 5.0V 90 160 80 70 MHz
tW
Pulse Width
SHCP
HIGH or LOW Figure 2 CL = 50pF 4.5V to 5.0V 5.5 6.0 6.5
ns
STCP
HIGH or LOW Figure 2 CL = 50pF 4.5V to 5.0V 5.5 6.0 6.5
SHR and STR
HIGH or LOW Figure 2 CL = 50pF 4.5V to 5.0V 5.2 5.5 6.0
tSU
Set-up Time
DS to SHCP Figure 2 CL = 50pF 4.5V to 5.0V 3.0 3.0 3.5
ns
SHR to STCP Figure 2 CL = 50pF 4.5V to 5.0V 5.0 5.0 5.5
SHCP to
STCP Figure 2 CL = 50pF 4.5V to 5.0V 5.0 5.0 5.5
tH
Hold Time DS to SHCP Figure 2 CL = 50pF 4.5V to 5.0V 5 2.0 2.0 2.5 ns
tREC
Recovery Time
SHR to SHCP
and STR to
STCP Figure 2 CL = 50pF 4.5V to 5.0V 10 2.9 3.3 3.8 ns
tPLH
Propagation
Delay
SHCP toQ7S Figure 2 CL = 15pF 4.5V to 5.0V 4.1 6.7 1.8 7.6 1.8 8.3
ns
Figure 2 CL = 50pF 4.5V to 5.0V 5.4 8.8 2.4 10.1 2.4 11.0
STCP to Qn Figure 2 CL = 15pF 4.5V to 5.0V 3.7 6.1 1.9 6.9 1.9 7.2
Figure 2 CL = 50pF 4.5V to 5.0V 5.2 8.5 2.6 9.7 2.6 10.5
tPHl
Propagation
Delay
SHCP to Q7S Figure 2 CL = 15pF 4.5V to 5.0V 4.1 6.7 1.8 7.6 1.8 8.3
ns
Figure 2 CL = 50pF 4.5V to 5.0V 5.4 8.8 2.4 10.1 2.4 11.0
STCP to Qn Figure 2 CL = 15pF 4.5V to 5.0V 3.7 6.1 1.9 6.9 1.9 7.2
Figure 2 CL = 50pF 4.5V to 5.0V 5.2 8.5 2.6 9.7 2.6 10.5
SHR to Q7S Figure 2 CL = 15pF 4.5V to 5.0V 4.3 7.0 2.4 8.0 2.4 8.7 ns
Figure 2 CL = 50pF 4.5V to 5.0V 5.4 8.8 2.7 10.1 2.7 11.0
STR to Qn Figure 2 CL = 15pF 4.5V to 5.0V 4.5 7.4 2.3 8.4 2.3 9.2 ns
Figure 2 CL = 50pF 4.5V to 5.0V 5.7 9.4 3.1 10.7 3.1 11.7
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter Test
Conditions VCC = 5V Unit
Typ
Cpd Power dissipation
capacitance f = 1 MHz all outputs switching-no load
VI = GND TO VCC -1.5V 51 pF
74AHCT594
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Parameter Measurement Information
VCC Inputs VM
VI t
r/tf
4.5V VCC 6ns VCC/2
5.0V VCC 6ns VCC/2
Voltage Waveform
Pulse Duration and Recovery Time Voltag e Waveform
Set-up and Hold Times
Voltage Waveform
Propagation Delay Times
Inverting and Non Inverting Outputs
Notes: A. Includes test lead and test apparatus capacitance.
B. All pulses are supplied at pulse repetition rate ≤ 10 MHz.
C. Inputs are measured separately one transition per measurement.
D. t
PLH and tPHL are the same as tPD.
Figure 2 Load Circuit and Voltage Waveforms
74AHCT594
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74AHCT594
Ordering Information
Device Package Code Packaging 7” Tape and Reel (Note 6)
Quantity Part Number Suffix
74AHCT594S16-13 S16 SO-16 2500/Tape & Reel -13
74AHCT594T16-13 T16 TSSOP-16 2500/Tape & Reel -13
Note: 6. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf
Marking Information
(1) SO-16, TSSOP16
Part Number Package
74AHCT594S16 SO-16
74AHCT594T16 TSSOP-16
74AHCT594
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74AHCT594
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
Package Type: SO-16
Package Type: TSSOP-16
SO-16
Dim Min Max
A 1.40 1.75
A1 0.10 0.25
A2 1.30 1.50
B 0.33 0.51
C 0.19 0.25
D 9.80 10.00
E 3.80 4.00
e 1.27 Typ
H 5.80 6.20
L 0.38 1.27
Θ
0 8
All Dimensions in mm
TSSOP-16
Dim Min Max Typ
A - 1.08 -
A1 0.05 0.15 -
A2 0.80 0.93 -
b 0.19 0.30 -
c 0.09 0.20 -
D 4.90 5.10 -
E 6.40 BSC
E1 4.30 4.50 -
e 0.65 BSC
L 0.45 0.75 -
L1 1.00 REF
L2 0.25 BSC
R 0.09 - -
R1 0.09 - -
X - - 1.350
Y - - 1.050
Θ0° 8° -
Θ1 5° 15° -
Θ2 0° - -
All Dimensions in mm
D
EH
L
A2
BeA1
A
C
Detail ‘A’
Detail ‘A’
Gauge Plane
PIN 1
eb
E
E/2
E1
A2
A
D
A1
X
Y
SEE DETAIL 'A'
SEATING PLANE
GAUGE
PLANE
R
L
L1
L2
Ø0.760Depth0.050±0.02
R1
x)
C
DETAIL 'A'
74AHCT594
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74AHCT594
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
Package Type: SO-16
Package Type: TSSOP-16
Dimensions Value (in mm)
C 1.270
X 0.670
X1 9.560
Y 1.450
Y1 6.400
Dimensions Value (in mm)
C 0.650
X 0.350
X1 4.900
Y 1.400
Y1 6.800
X1
XC
Y
Y1
Pin 1
X1
Y (16x )
Y1
X (16x)
1
C
74AHCT594
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74AHCT594
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