SN54/74LS192 • SN54/74LS193
AC SETUP REQUIREMENTS (T = 25°C)
A
Limits
Typ
Symbol
Parameter
Unit
ns
Test Conditions
Min
20
Max
t
t
t
t
Any Pulse Width
W
Data Setup Time
Data Hold Time
Recovery Time
20
ns
s
V
CC
= 5.0 V
5.0
40
ns
h
ns
rec
DEFINITIONS OF TERMS
SETUP TIME (t ) is defined as the minimum time required for
s
tion. A negative HOLD TIME indicates that the correct logic
level may be released prior to the PL transition from
LOW-to-HIGH and still be recognized.
thecorrectlogicleveltobepresentatthelogicinputpriortothe
PLtransitionfromLOW-to-HIGHinordertoberecognizedand
transferred to the outputs.
RECOVERY TIME (t ) is defined as the minimum time
rec
HOLD TIME (t ) is defined as the minimum time following the
h
PL transition from LOW-to-HIGH that the logic level must be
maintained at the input in order to ensure continued recogni-
required between the end of the reset pulse and the clock
transition from LOW-to-HIGH in order to recognize and
transfer HIGH data to the Q outputs.
FAST AND LS TTL DATA
5-356
MOTOROLA [ MOTOROLA ]
