MM74HC594 8-Bit Shift Register with Output Registers
January 1992
Revised May 1999
MM74HC594
8-Bit Shift Register with Output Registers
The 74HC logic family is speed, function, and pin-out com-
General Description
patible with the standard 74LS logic family. All inputs are
This high speed shift register utilizes advanced silicon-gate
protected from damage due to static discharge by internal
CMOS technology. This device possesses the high noise
diode clamps to V and ground.
CC
immunity and low power consumption of standard CMOS
integrated circuits, as well as the ability to drive 15 LS-TTL
Features
loads.
Low quiescent current: 80 A maximum
This device contains an 8-bit serial-in, parallel-out shift reg-
ister that feeds an 8-bit D-type storage register. Separate
Low input current: 1 A maximum
clocks and direct overriding clears are provided for both the
8-bit serial-in, parallel-out shift register with storage
shift register and the storage register. The shift register has
Wide operating voltage range: 2V to 6V
a direct-overriding clear, serial input, and serial output
Cascadable
(standard) pins for cascading. Both the shift register and
storage register use positive-edge triggered clocks. If both
Shift register has direct clear
clocks are connected together, the shift register state will
Guaranteed shift frequency: DC to30 MHz
always be one clock pulse ahead of the storage register.
Ordering Code:
Order Number Package Number Package Description
MM74HC594M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HC594N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code.
Connection Diagram Truth Table
RCK SCK SCLR RCLR Function
X X X L Storage Register cleared
Shift Register cleared
XX L X
Q = 0
H
Shift Register clocked
X HH
Q = Q , Q = SER
N n- 1 0
Contents of Shift
XH H Register transferred
to output latches
1999 Fairchild Semiconductor Corporation DS010915.prf www.fairchildsemi.comLogic Diagram
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MM74HC594