DM74AS161, Synchronous 4-Bit Counter with Asynchronous Clear DM74AS163, Synchronous 4-Bit Counter
©1984 Fairchild Semiconductor Corporation www.fairchildsemi.com
DM74AS161, DM74AS163 Rev. 1.2 5
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol Parameter Rating
V
CC
Supply Voltage 7V
V
I
Input Voltage 7V
T
A
Operating Free Air Temperature Range 0°C to +70°C
T
STG
Storage Temperature Range –65°C to +150°C
θ
JA
Typical Thermal Resistance 101.0°C/W
Symbol Parameter Min. Nom. Max. Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current –2 mA
I
OL
LOW Level Output Current 20 mA
f
CLK
Clock Frequency 0 75 MHz
t
SU
t
SETUP
, Set-Up Time Data; A, B, C, D 8 ns
En P, En T 8
LO
AD 8
CLEAR
(Only for DM74AS163)
LOW 12
HIGH 9
Set-up 1 (Only for DM74AS161) CLEAR
8
t
H
t
HOLD
, Hold Time Data; A, B, C, D 0 ns
En P, En T 0
LO
AD 0
CLEAR
(Only for DM74AS163)
0
Hold 0 (Only for DM74AS161) CLEAR
0
t
WCLK
Width of Clock Pulse 6.7 ns
t
WCLR
Width of Clear Pulse, (DM74ASAS161 LOW) 8 ns
