8-bit serial-in, serial or parallel-out shift register with output
latches; 3-state
Rev. 6 — 12 December 2011Product data sheet
1. General description
The 74HC595; 74HCT595 are high-speed Si-gate CMOS device s and ar e pin co mpatible
with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard No. 7A.
The 74HC595; 74HCT595 are 8-stage serial shift registers with a storage register and
3-state outputs. The registers have separate clocks.
Data is shifted on the positive-going transitions of the shift register clock input (SHCP).
The data in each register is transferred to the storage register on a positive-going
transition of the storage register clock input (STCP). If both clocks are connected together,
the shift register will always be one clock pulse ahead of the storage register.
The shift register has a serial input (DS) and a serial standard output (Q7S) for cascading.
It is also provided with asynchronous reset ( active LOW) for all 8 shif t register st ages. The
storage register has 8 parallel 3-state bus driver output s. Data in the storage register
appears at the output whenever the output enable input (OE
2. Features and benefits
8-bit serial input
8-bit serial or parallel output
Storage register with 3-state outputs
Shift register with direct clear
100 MHz (typical) shift out frequency
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
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
) is LOW.
NXP Semiconductors
mna554
3-STATE OUTPUTS
8-BIT STORAGE REGISTER
8-STAGE SHIFT REGISTER
Q
0
Q1 Q2 Q3 Q4 Q5 Q6 Q7
Q7S
14
151234567
9
D
S
SHCP
STCP
OE
11
10
12
13
MR
4. Ordering information
74HC595; 74HCT595
8-bit serial-in, serial or parallel-out shift register with output latches;
3-state
Table 1.Ordering information
Type numberPackage
Temperature range NameDescriptionVersion
74HC595N40 C to +125 CDIP16plastic dual in-line package; 16 leads (300 mil)SOT38-4
74HCT595N
74HC595D40 C to +125 CSO16plastic small outline package; 16 leads;
74HCT595D
body width 3.9 mm
74HC595DB40 C to +125 CSSOP16plastic shrink small outline package; 16 leads;
74HCT595DB
body width 5.3 mm
74HC595PW40 C to +125 CTSSOP16plastic thin shrink small outline package; 16 leads;
74HCT595PW
body width 4.4 mm
74HC595BQ40C to +125 CDHVQFN16plastic dual in-line compatible thermal enhanced
74HCT595BQ
very thin quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm
Product data sheetRev. 6 — 12 December 2011 4 of 24
NXP Semiconductors
8-bit serial-in, serial or parallel-out shift register with output latches;
6.2 Pin description
Table 2.Pin description
SymbolPinDescription
Q11parallel data output 1
Q22parallel data output 2
Q33parallel data output 3
Q44parallel data output 4
Q55parallel data output 5
Q66parallel data output 6
Q77parallel data output 7
GND8ground (0 V)
Q7S9serial data output
MR
SHCP11shift register clock input
STCP12storage register clock input
OE
DS14serial data input
Q015parallel data output 0
V
CC
10master reset (active LOW)
13output enable input (active LOW)
16supply voltage
74HC595; 74HCT595
3-state
7. Functional description
Table 3.Function table
ControlInput OutputFunction
SHCP STCP OEMRDSQ7SQn
XXLLXLNCa LOW-level on MR
XLLXLLempty shift register loaded into storage register
XXHLXLZshift register clear; parallel outputs in high-impedance OFF-state
XLHHQ6SNClogic HIGH-level shifted into shift register stage 0. Contents of all
XLHXNCQnScontents of shift register stages (internal QnS) are transferred to
LHXQ6SQnScontents of shift register shifted throug h ; pre vi o us contents of the
[1] H = HIGH voltage state;
L = LOW voltage state;
= LOW-to-HIGH transition;
X = don’t care;
NC = no change;
Z = high-impedance OFF-state.
[1]
only affects the shift registers
shift register stages shifted through, e.g. previous state of stage 6
(internal Q6S) appears on the serial output (Q7S).
the storage register and parallel output stages
shift register is transferred to the storage register and the parallel
output stages
Product data sheetRev. 6 — 12 December 2011 5 of 24
NXP Semiconductors
SHCP
DS
STCP
MR
OE
Q0
74HC595; 74HCT595
8-bit serial-in, serial or parallel-out shift register with output latches;
3-state
Z-state
Q1
Q6
Q7
Q7S
Z-state
Z-state
Z-state
mna556
Fig 8.Timing diagram
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).
SymbolParameterConditionsMinMaxUnit
V
I
IK
I
OK
I
O
I
CC
I
GND
T
P
CC
stg
tot
supply voltage0.5+7V
input clamping currentVI < 0.5 V or VI>VCC+ 0.5 V-20mA
output clamping currentVO< 0.5 V or VO > VCC + 0.5 V-20mA
output currentVO= 0.5 V to (VCC+0.5V)
supply current-70mA
ground current70-mA
storage temperature65+150C
total power dissipation
Product data sheetRev. 6 — 12 December 2011 20 of 24
NXP Semiconductors
14. Abbreviations
74HC595; 74HCT595
8-bit serial-in, serial or parallel-out shift register with output latches;
3-state
Table 10. Abbreviations
AcronymAbbreviation
CMOSComplementary Metal Oxide Semiconductor
DUTDevice Under Test
ESDElectroStatic Discharge
HBMHuman Body Model
LSTTLLow-power Schottky Transistor-Transistor Logic
MMMachine Model
Product data sheetRev. 6 — 12 December 2011 21 of 24
NXP Semiconductors
74HC595; 74HCT595
8-bit serial-in, serial or parallel-out shift register with output latches;
3-state
16. Legal information
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information is available on the Internet at URL
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[3]
Definition
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Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
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Product data sheetRev. 6 — 12 December 2011 22 of 24
NXP Semiconductors
74HC595; 74HCT595
8-bit serial-in, serial or parallel-out shift register with output latches;
3-state
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