SL74HC299

System Logic

Semiconductor

SLS

8-Bit Bidirectional Universal

Shift Register with Parallel I/O

High-Performance Silicon-Gate CMOS

The SL74HC299 is identical in pinout to the LS/ALS299. The device

inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LS/ALSTTL outputs.

The SL74HC299 features a multiplexed parallel input/output data

port to achieve full 8-bit handling in a 20 pin package. Due to the large

output drive capability and the 3-state feature, this device is ideally

suited for interface with bus lines in a bus-oriented system.

Two Mode-Select inputs and two Output Enable inputs are used to

choose the mode of operation as listed in the Function Table.

Synchronous parallel loading is accomplished by taking both Mode-

impedance state, which permits data applied to the data port to be

clocked into the register. Reading out of the register can be

accomplished

when

the

outputs

are

enabled.

The

active-low

asynchronous Reset overrides all other inputs.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

ORDERING INFORMATION

SL74HC299N Plastic

SL74HC299D SOIC

° to 125° C for all packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 10 = GND