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July 2001
s
HIGH SPEED :
f
MAX
= 50 MHz (TYP.) at V
CC
= 6V
s
LOW POWER DISSIPATION:
I
CC
=4
A(MAX.) at T
A
=25C
s
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
WIDE OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 597
DESCRIPTION
The M74HC597 is an high speed CMOS 8 BIT
PIPO SHIFT REGISTER fabricated with silicon
gate C
2
MOS technology.
This devices comes in a 16-pin package and
consist of an 8-bit storage latch feeding a parallel
in, serial out 8-bit shift register. Both the storage
register and shift register have positive edge
triggered clocks. The shift register also has direct
load (from storage) and clear inputs.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC597
8 BIT LATCH/SHIFT REGISTER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
M74HC597B1R
SOP
M74HC597M1R
M74HC597RM13TR
TSSOP
M74HC597TTR
TSSOP
DIP
SOP
M74HC597
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INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don't Care
PIN No
SYMBOL
NAME AND FUNCTION
9
QH'
Serial Data Outputs
10
SCLR
Asynchronous Reset
Input (Active LOW)
11
SCK
Shift Clock Input (LOW to
HIGH Edge-triggered)
12
RCK
Storage Clock Input (LOW
to HIGH Edge-triggered)
13
SLOAD
Parallel Data Input (Active
Low)
10
SI
Serial Data Input
15, 1, 2, 3, 4,
5, 6, 7
A to H
Parallel Data Inputs
8
GND
Ground (0V)
16
Vcc
Positive Supply Voltage
INPUTS
OUTPUT
SI
SCK
SCLR
SLOAD
RCK
X
X
L
H
X
S.R. IS CLEARED TO "L"
X
X
H
L
X
INPUT REGISTER DATA IS STORED INTO S.R.
L
H
H
X
FIRST STAGE OF S.R. BECOMES "L" OTHER STAGES
STORE THE DATA OF PREVIOUS STAGE, RESPECTIVELY
H
H
H
X
FIRST STAGE OF S.R. BECOMES "H" OTHER STAGES
STORE THE DATA OF PREVIOUS STAGE, RESPECTIVELY
X
H
H
X
STATE OF S.R. IS NOT CHANGED
X
X
X
X
INPUT DATA ON A
~ H LINE IS STORED INTO INPUT REG-
ISTER
X
X
X
X
STORAGE REGISTER STATE IS NOT CHANGED
M74HC597
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TIMING CHART
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
C; derate to 300mW by 10mW/
C from 65
C to 85
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
P
D
Power Dissipation
500(*)
mW
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
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