Qualified for Automotive Applications

ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

Wide Operating Voltage Range of 2 V to 6 V

Outputs Can Drive Up To 10 LSTTL Loads

Low Power Consumption, 80-μA Max ICC

Typical tpd = 13 ns

±4-mA Output Drive at 5 V

Low Input Current of 1 μA Max

Synchronous Load

Direct Overriding Clear

Parallel-to-Serial Conversion

description/ordering information

This parallel-in or serial-in, serial-out register

features gated clock (CLK, CLK INH) inputs and an

overriding clear (CLR) input. The parallel-in or

serial-in modes are established by the shift /load

(SH/LD) input. When high, SH/LD enables the serial (SER) data input and couples the eight flip-flops for serial

shifting with each clock (CLK) pulse. When low, the parallel (broadside) data inputs are enabled, and

synchronous loading occurs on the next clock pulse. During parallel loading, serial data flow is inhibited.

Clocking is accomplished on the low-to-high-level edge of CLK through a 2-input positive-NOR gate, permitting

one input to be used as a clock-enable or clock-inhibit function. Holding either CLK or CLK INH high inhibits

clocking; holding either low enables the other clock input. This allows the system clock to be free running, and

the register can be stopped on command with the other clock input. CLK INH should be changed to the high

level only when CLK is high. CLR overrides all other inputs, including CLK, and resets all flip-flops to zero.