74HC594; 74HCT594
8-bit shift register with output register
Rev. 4 — 25 February 2016
Product data sheet
1. General description
The 74HC594; 74HCT594 is an 8-bit serial-in/serial or parallel-out shift register with a
storage register. Separate clock and reset inputs are provided on both shift and storage
registers. The device features a serial input (DS) and a serial output (Q7S) to enable
cascading. Data is shifted on the LOW-to-HIGH transitions of the SHCP input, and the
data in the shift register is transferred to the storage register on a LOW-to-HIGH transition
of the STCP input. If both clocks are connected together, the shift register will always be
one clock pulse ahead of the storage register. A LOW level on one of the two register
reset pins (SHR and STR) will clear the corresponding register. Inputs include clamp
diodes. This enables the use of current limiting resistors to interface inputs to voltages in
excess of V
CC
.
2. Features and benefits
Synchronous serial input and output
Complies with JEDEC standard No.7A
8-bit parallel output
Shift and storage registers have independent direct clear and clocks
Independent clocks for shift and storage registers
100 MHz (typical)
Input levels:
For 74HC594: CMOS level
For 74HCT594: TTL level
Multiple package options
Specified from
40 C
to +85
C
and from
40 C
to +125
C
3. Applications
Serial-to parallel data conversion
Remote control holding register
Nexperia
74HC594; 74HCT594
8-bit shift register with output register
4. Ordering information
Table 1.
Ordering information
Package
Temperature
range
74HC594D
74HCT594D
74HC594DB
74HCT594DB
40 C
to +125
C
SSOP16
40 C
to +125
C
Name
SO16
Description
plastic small outline package; 16 leads;
body width 3.9 mm
plastic shrink small outline package; 16 leads;
body width 5.3 mm
Version
SOT109-1
SOT338-1
Type number
5. Functional diagram
Fig 1.
Functional diagram
Fig 2.
Logic symbol
Fig 3.
IEC logic symbol
74HC_HCT594
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 25 February 2016
2 of 23
Nexperia
74HC594; 74HCT594
8-bit shift register with output register
Fig 4.
Logic diagram
Fig 5.
Timing diagram
74HC_HCT594
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 25 February 2016
3 of 23
Nexperia
74HC594; 74HCT594
8-bit shift register with output register
6. Pinning information
6.1 Pinning
Fig 6.
Pin configuration SO16
Fig 7.
Pin configuration SSOP16
6.2 Pin description
Table 2.
Symbol
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7
GND
Q7S
SHR
SHCP
STCP
STR
DS
V
CC
Pin description
Pin
15, 1, 2, 3, 4, 5, 6, 7
8
9
10
11
12
13
14
16
Description
parallel data output
ground (0 V)
serial data output
shift register reset (active LOW)
shift register clock input
storage register clock input
storage register reset (active LOW)
serial data input
supply voltage
74HC_HCT594
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 25 February 2016
4 of 23
Nexperia
74HC594; 74HCT594
8-bit shift register with output register
7. Functional description
Table 3.
Function
Clear shift register
Clear storage register
Load DS into shift register stage 0, advance previous stage data to the next stage
Transfer shift register data to storage register and outputs Qn
Shift register one count pulse ahead of storage register
[1]
H = HIGH voltage level;
L = LOW voltage level;
= LOW-to-HIGH transition;
X = don’t care.
Function table
[1]
Input
SHR
L
X
H
X
H
STR
X
L
X
H
H
SHCP STCP
X
X
X
X
X
X
DS
X
X
H or L
X
X
8. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
Parameter
supply voltage
input clamping current
output clamping current
output current
V
I
<
0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
0.5
V or V
O
> V
CC
+ 0.5 V
V
O
=
0.5
V to V
CC
+ 0.5 V
Serial data output Q7S
Parallel data output
I
CC
I
GND
T
stg
P
tot
[1]
[2]
[1]
[1]
Conditions
Min
0.5
-
-
-
-
-
-
-
-
65
[2]
Max
+7.0
20
20
25
35
50
70
50
70
+150
500
Unit
V
mA
mA
mA
mA
mA
mA
mA
mA
C
mW
supply current
ground current
storage temperature
total power dissipation
Serial data output Q7S
Parallel data output
Serial data output Q7S
Parallel data output
T
amb
=
40 C
to +125
C
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SO16 packages: above 70
C
the value of P
tot
derates linearly with 8 mW/K.
For SSOP16 packages: above 60
C
the value of P
tot
derates linearly with 5.5 mW/K.
74HC_HCT594
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 25 February 2016
5 of 23
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