TECHNICAL DATA
IN74HC299A
8-Bit Bidirectional Universal
Shift Register with Parallel I/O
High-Performance Silicon-Gate CMOS
The IN74HC299A 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 IN74HC299A 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-
Select lines, S
1
and S
2
, high. This places the outputs in the high-
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
IN74HC299AN Plastic
IN74HC299ADW SOIC
T
A
= -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 20=V
CC
PIN 10 = GND
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
