74ACT299M STMICROELECTRONICS [STMicroelectronics], 74ACT299M Datasheet - Page 2

• Manufacturer Part Number: 74ACT299M
• Description: 8 BIT PIPO SHIFT REGISTER WITH ASYNCHRONOUS CLEAR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

74ACT299
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
* When one or both output controls are high, the eight, input/output terminals arethe high impedanc e state: howewer sequential operation or clearing of
the register is not affected.
Z
Qn0 : THE LEVELOF An BEFORE THE INDICATED STEADYSTATEINPUTCONDITIONS WERE ESTABLISED.
Qnn : THE LEVELOF Qn BEFORETHE MOST RECENTACTIVETRANSITIONINDICATEDBY OR
a,h : THE LEVELOF THE STEADYSTATEINPUTSA, H, RESPECTIVELY.
X
2/13
CLEAR
MO DE
RIGHT
SHIFT
SHIFT
HOLD
LOAD
LEFT
7, 13, 6, 14, 5, 15, 4, 16
Z
: HIGH IMPEDANCE
: DON’T CARE
PIN No
CLEAR
1, 19
8, 17
2, 3
11
12
18
10
20
9
H
H
H
H
H
H
L
L
L
SELECTED
F UNCTIO N
S1
H
X
H
H
H
L
L
L
L
S0
H
X
H
H
H
L
L
L
L
INPUTS
A/QA to H/QH
QA’ to QH’
SYMBOL
CLOCK
CLEAR
G1, G2
S0, S1
GND
G1*
V
CONTRO L
SR
SL
X
X
OUTPUT
L
L
L
L
L
L
L
CC
G2*
X
X
L
L
L
L
L
L
L
CLO CK
Mode Select Inputs
3 State Output Enable Inputs (Active LOW)
Parallel Data Inputs or 3 State Parallel Outputs (Bus Driver)
Serial Outputs (Standard Output)
Asynchronous Master Reset Input (Active LOW)
Serial Data Shift Right Input
Clock Input (LOW to HIGH, Edge-triggered)
Serial Data Shift Left Input
Ground (0V)
Positive Supply Voltage
X
X
X
X
SL
X
X
X
X
X
X
H
X
L
SERIAL
INPUTS/OUTPUTS
NAME AND F UNCTION
SR
X
X
X
X
H
X
X
X
L
A/Q A
QA0
QBn
QBn
Z
H
L
L
L
a
H/Q H
QGn
QGn
QH0
Z
H
L
L
L
h
QA’
QA0
QBn
QBn
O UT PUT S
H
L
L
L
L
a
QGn
QGn
QH’
QH0
H
L
L
L
L
h