TECHNICAL DATA
8-Bit Bidirectional Universal
Shift Register with Parallel I/O
High-Speed Silicon-Gate CMOS
The IN74AC299 is identical in pinout to the LS/ALS299, HC/HCT299.
The device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALS outputs.
The IN74AC299 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.
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Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0
µA;
0.1
µA
@ 25°C
High Noise Immunity Characteristic of CMOS Devices
Outputs Source/Sink 24 mA
IN74AC299
ORDERING INFORMATION
IN74AC299N Plastic
IN74AC299DW SOIC
T
A
= -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 20=V
CC
PIN 10 = GND
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
