1.
General description
The 74AHC594; 74AHCT594 is a high-speed Si-gate CMOS device and is pin compatible
with Low-Power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard
No. 7A.
The 74AHC594; 74AHCT594 is an 8-bit, non-inverting, serial-in, parallel-out shift register
that feeds an 8-bit D-type storage register. Separate clocks (SHCP and STCP) and direct
overriding clears (SHR and STR) are provided on both the shift and storage registers.
A serial output (Q7S) is provided for cascading purposes.
Both the shift and storage register clocks are positive-edge triggered. If the user wishes to
connect both clocks together, the shift register will always be one count pulse ahead of the
storage register.
2.
Features
s
Wide supply voltage range from 2.0 V to 5.5 V
s
8-bit serial-in, parallel-out shift register with storage
s
Independent direct overriding clears on shift and storage registers
s
Independent clocks for shift and storage registers
s
Latch-up performance exceeds 100 mA per JESD 78 Class II
s
Input levels:
x
CMOS levels: 74AHC594 only
x
TTL levels: 74AHCT594 only
s
ESD protection:
x
HBM JESD22-A114-C exceeds 2000 V
x
MM JESD22-A115-A exceeds 200 V
x
CDM JESD22-C101-C exceeds 1000 V
s
Specified from
-
40
C to +85
C and from
-
40
C to +125
C
3.
Applications
s
Serial-to parallel data conversion
s
Remote control holding register
74AHC594; 74AHCT594
8-bit shift register with output register
Rev. 01 -- 4 July 2006
Product data sheet
74AHC_AHCT594_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 -- 4 July 2006
2 of 29
Philips Semiconductors
74AHC594; 74AHCT594
8-bit shift register with output register
4.
Ordering information
5.
Functional diagram
Table 1.
Ordering information
Type number
Package
Temperature
range
Name
Description
Version
74AHC594D
-
40
C to +125
C
SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74AHC594DB
-
40
C to +125
C
SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74AHC594PW
-
40
C to +125
C
TSSOP16
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
74AHC594BQ
-
40
C to +125
C
DHVQFN16
plastic dual in-line compatible thermal enhanced very
thin quad flat package; no leads; 16 terminals;
body 2.5
3.5
0.85 mm
SOT763-1
74AHCT594D
-
40
C to +125
C
SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74AHCT594DB
-
40
C to +125
C
SSOP16
plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74AHCT594PW
-
40
C to +125
C
TSSOP16
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
74AHCT594BQ
-
40
C to +125
C
DHVQFN16
plastic dual in-line compatible thermal enhanced very
thin quad flat package; no leads; 16 terminals;
body 2.5
3.5
0.85 mm
SOT763-1
Fig 1.
Functional diagram
mbc320
Q7
Q0 Q1 Q2 Q3 Q4 Q5 Q6
DS
SHCP
SHR
STCP
STR
14
10
13
11
12
15
9
1
2
3
4
5
6
7
8-STAGE SHIFT REGISTER
8-BIT STORAGE REGISTER
Q7S
74AHC_AHCT594_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 -- 4 July 2006
5 of 29
Philips Semiconductors
74AHC594; 74AHCT594
8-bit shift register with output register
6.2 Pin description
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
supply pin or input
Fig 7.
Pin configuration TSSOP16
Fig 8.
Pin configuration DHVQFN16
74AHC594
74AHCT594
Q1
V
CC
Q2
Q0
Q3
DS
Q4
STR
Q5
STCP
Q6
SHCP
Q7
SHR
GND
Q7S
001aae344
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
001aae345
74AHC594
74AHCT594
Q7
SHR
Q6
SHCP
Q5
STCP
Q4
STR
Q3
DS
Q2
Q0
GND
Q7S
Q1
V
CC
Transparent top view
7
10
6
11
5
12
4
13
3
14
2
15
8
9
1
16
terminal 1
index area
GND
(1)
Table 2.
Pin description
Symbol
Pin
Description
Q1
1
parallel data output Q1
Q2
2
parallel data output Q2
Q3
3
parallel data output Q3
Q4
4
parallel data output Q4
Q5
5
parallel data output Q5
Q6
6
parallel data output Q6
Q7
7
parallel data output Q7
GND
8
ground (0 V)
Q7S
9
serial data output Q7S
SHR
10
shift register reset SHR (active LOW)
SHCP
11
shift register clock input SHCP
STCP
12
storage register clock input STCP
STR
13
storage register reset STR (active LOW)
DS
14
serial data input DS
Q0
15
parallel data output Q0
V
CC
16
supply voltage
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