74AHCT594

74AHCT594
8-BIT SHIFT REGISTER WITH 8-BIT OUTPUT REGISTER
Description
Pin Assignments
The 74AHCT594 is an advanced high speed CMOS device that is
( Top View )
designed to be pin compatable with 74LS low power Schottky types.
Q1
1
16
Vcc
asserted low the shift register reset function (SHR) sets all shift
Q2
2
15
Q0
register values to zero and is independent of all clocks. Also when
Q3
3
14
DS
register values to zero and is independent of all clocks.
Q4
4
13
STR
Data from the input serial shift register is placed in the output register
Q5
5
12
STCP
Q6
6
11
SHCP
Q7
7
10
SHR
8
9
Q7S
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 storage register reset function (STR) sets all shift
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.
GND
All registers capture data on rising edge and change output on the
SO-16 / TSSOP-16
falling edge. If both clocks are connected together, the input shift
register is always one clock cycle ahead of the output register.
Features
Applications


Wide Supply Voltage Range from 4.5V to 5.5V
Sinks or sources 8mA at VCC = 4.5V

General Purpose Logic

Serial to Parallel Data conversion

CMOS low power consumption

Capture and hold data for extended periods of time.

Schmitt Trigger Action at All Inputs


Inputs accept up to 6.0V

Allow simple serial bit streams from a microcontroller to control as
many peripheral lines as needed.

ESD Protection Tested per JESD 22
Wide array of products such as:

Exceeds 200-V Machine Model (A115-A)

Computer Peripherals

Exceeds 2000-V Human Body Model (A114-A)

Appliances

Exceeds 1000-V Charged Device Model (C101C)

Industrial control

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)
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- and 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
Document number: DS35485 Rev. 2 - 2
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74AHCT594
Pin Descriptions
Functional Diagram
Pin Number
Pin Name
1
Q1
Parallel Data Output 1
Description
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
9
Q7S
Serial Data Output
10
SHR
Shift Register Reset active low
11
SHCP
12
STCP
13
STR
14
DS
Serial Data input
15
Q0
Parallel Data Output 0
16
Vcc
Supply Voltage
Ground
Shift Register Clock Input
Storage Register Clock Input
Storage Register Reset active low
Logic Diagram
STAGE 0
DS
D
STAGES 1 TO 6
D
Q
STAGE 7
Q
D
Q
FF0
FF7
CP
CP
R
R
SHCP
SHR
D
Q
D
LATCH
Q
LATCH
CP
CP
R
R
STCP
STR
Q0
74AHCT594
Document number: DS35485 Rev. 2 - 2
Q1 Q2 Q3
Q4 Q5 Q6
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Q7
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74AHCT594
Functional Description and Timing Diagram
Control
SHR
L
X
STR
X
L
Input
SHCP
X
X
Output
Function
STCP
X
X
DS
X
X
Q7S
L
NC
Qn
NC
L
Clear Shift Register
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
H
H


H or L
Q6S
QnS
Contents of shift register moved to starge register all QS -> QN
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
ESD HBM
ESD CDM
ESD MM
Rating
2
1
200
Unit
KV
KV
V
V
Supply Voltage Range
-0.5 to +7.0
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
VCC
Notes:
Parameter
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
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
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
Document number: DS35485 Rev. 2 - 2
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74AHCT594
Recommended Operating Conditions (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol
Min
Max
Unit
Supply Voltage

4.5
5.5
V
VI
Input Voltage

0
5.5
V
VO
VCC
Parameter
Conditions
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
TA = +25°C
Min Typ Max
VCC
TA = -40°C to +85°C TA = -40°C to +125°C
Min
Max
Min
Max
Unit
VIL
High-level Input

Voltage
Low-level input

voltage
VOH
High Level
Output Voltage
IOH = -50μA
4.5V
4.4
4.5

4.4

4.4

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
IOL = 8mA
4.5V


0.36

0.44

0.55
Input Current
VI = GND or 5.5V
0V to 5.5V

0.1
±0.1

±1

±2
μA
Supply Current
VI = GND or VCC
IO = 0
5.5V


4.0

40

80
μA
4.5V to 5.5V


1.35

1.5

1.5
mA
5.5V

3.5
10

10

10
pF
VIH
II
ICC
∆ICC
Ci
Additional
Supply Current
per Input
Input
Capacitance
VI = VCC -2.1V
IO = 0
Vi = VCC or GND
74AHCT594
Document number: DS35485 Rev. 2 - 2
4.5V to 5.5V
2.0


2.0

2.0

V
4.5V to 5.5V


0.8

0.8

0.8
V
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V
V
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74AHCT594
Switching Characteristics
Symbol /
Parameter
Pins
fMAX
Maximum
Frequency
SHCP or
STCP
Test Conditions
TA = +25°C
Min
Typ
Max
VCC
tH
Hold Time
Max
Unit

70

5.5


6.0

6.5

5.5


6.0

6.5

SHR and STR Figure 2 C = 50pF 4.5V to 5.0V
L
HIGH or LOW
5.2


5.5

6.0

Figure 2 CL = 50pF 4.5V to 5.0V
3.0


3.0

3.5

SHR to STCP Figure 2 CL = 50pF 4.5V to 5.0V
SHCP to
Figure 2 CL = 50pF 4.5V to 5.0V
STCP
5.0


5.0

5.5

5.0


5.0

5.5

Figure 2 CL = 50pF 4.5V to 5.0V
5
2.0


2.0

2.5
ns
SHR to SHCP
and STR to Figure 2 CL = 50pF 4.5V to 5.0V
STCP
10
2.9


3.3

3.8
ns
STCP to Qn
SHCP to Q7S
STCP to Qn
tPHl
Propagation
Delay
Min
80
SHCP toQ7S
tPLH
Propagation
Delay
Max

DS to SHCP
tREC
Recovery Time
Min
160
DS to SHCP
tSU
Set-up Time
-40°C to +125°C
90
Figure 2 CL = 15pF 4.5V to 5.0V
SHCP
Figure 2 CL = 50pF 4.5V to 5.0V
HIGH or LOW
STCP
Figure 2 CL = 50pF 4.5V to 5.0V
HIGH or LOW
tW
Pulse Width
-40°C to +85°C
SHR to Q7S
STR to Qn
Figure 2 CL = 15pF 4.5V to 5.0V

4.1
6.7
1.8
7.6
1.8
8.3
Figure 2 CL = 50pF 4.5V to 5.0V

5.4
8.8
2.4
10.1
2.4
11.0
Figure 2 CL = 15pF 4.5V to 5.0V

3.7
6.1
1.9
6.9
1.9
7.2
10.5
Figure 2 CL = 50pF 4.5V to 5.0V

5.2
8.5
2.6
9.7
2.6
Figure 2 CL = 15pF 4.5V to 5.0V

4.1
6.7
1.8
7.6
1.8
8.3
Figure 2 CL = 50pF 4.5V to 5.0V

5.4
8.8
2.4
10.1
2.4
11.0
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
Figure 2 CL = 15pF 4.5V to 5.0V

4.3
7.0
2.4
8.0
2.4
8.7
Figure 2 CL = 50pF 4.5V to 5.0V

5.4
8.8
2.7
10.1
2.7
11.0
Figure 2 CL = 15pF 4.5V to 5.0V

4.5
7.4
2.3
8.4
2.3
9.2
Figure 2 CL = 50pF 4.5V to 5.0V

5.7
9.4
3.1
10.7
3.1
11.7
MHz
ns
ns
ns
ns
ns
ns
Operating Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter
Cpd
Power dissipation
capacitance
74AHCT594
Document number: DS35485 Rev. 2 - 2
Test
Conditions
VCC = 5V
Typ
Unit
f = 1 MHz all outputs switching-no load
VI = GND TO VCC -1.5V
51
pF
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74AHCT594
Parameter Measurement Information
VCC
Inputs
VI
4.5V
VCC
tr/tf
6ns
5.0V
VCC
6ns
Voltage Waveform
Pulse Duration and Recovery Time
VM
VCC/2
VCC/2
Voltage 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. tPLH and tPHL are the same as tPD.
Figure 2 Load Circuit and Voltage Waveforms
74AHCT594
Document number: DS35485 Rev. 2 - 2
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74AHCT594
Ordering Information
Device
Package Code
Packaging
S16
T16
SO-16
TSSOP-16
74AHCT594S16-13
74AHCT594T16-13
Note:
7” Tape and Reel (Note 6)
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
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
74AHCT594S16
74AHCT594T16
74AHCT594
Document number: DS35485 Rev. 2 - 2
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Package
SO-16
TSSOP-16
June 2013
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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
H
E
Gauge Plane

L
Detail ‘A’
D
A
A2
e
B
A1
C
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
Detail ‘A’
Package Type: TSSOP-16
E/2
SEE DETAIL 'A'
E1
E
Y
X
PIN 1
x)
b
e

Ø0.760Depth0.050±0.02
A2
R1
D
R
L2
C
GAUGE
PLANE
A
L
SEATING PLANE
A1
L1

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
Θ
0°
8°
Θ1
5°
15°
Θ2
0°
All Dimensions in mm
DETAIL 'A'
74AHCT594
Document number: DS35485 Rev. 2 - 2
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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
X1
Y1
Y
Dimensions
C
X
X1
Y
Y1
Value (in mm)
1.270
0.670
9.560
1.450
6.400
Pin 1
C
X
Package Type: TSSOP-16
X1
Dimensions
C
X
X1
Y
Y1
Y1
Y (16x)
Value (in mm)
0.650
0.350
4.900
1.400
6.800
1
X (16x)
74AHCT594
Document number: DS35485 Rev. 2 - 2
C
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74AHCT594
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
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website, harmless against all damages.
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
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