Texas Instruments 99/4A - Page 126

LS 373
OCTAL (8) D-TYPE LATCHES
3 STATE OUPUT: 1) HIGH
2) LOW
3) HIGH IMPEDANCE
WHEN G (ENABLE) IS HIGH, THEN Q (INPUT) WILL FOLLOW D (INPUT)
WHEN G (ENABLE) IS LOW, THEN Q (OUTPUT) WILL LATCH D (INPUT)
OUTPUT
CONTROL
I ENABLE
I G
D
I OUTPUT
i
L
i
! H
i
H
i
I H
i
L
! H
i
L I L
i
L I L
i
X
! Qo
i
H
I X
i
X
! HI = Z
i
Q o = DATA PRESENT AT INPUT WHEN ENABLE WENT LOW
X = DON'T CARE Fig. 37
116