Datasheet

SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54AS867 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74AS867 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54AS867 SN74AS867
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
OH
High-level output current –2 –2 mA
I
OL
Low-level output current 20 20 mA
f
clock
* Clock frequency 0 40 0 50 MHz
t
w(clock)
* Pulse duration, CLK high or low 12.5 10 ns
t
w(clear)
* Pulse duration of clear pulse, S0 and S1 low 12.5 10 ns
Data inputs A–H 5 4
ENP or ENT 9 8
t
*
Set p time before CLK↑
S0 low and S1 high (load) 11 10
ns
t
su
*
S
etup t
i
me
b
e
f
ore
CLK↑
S0 and S1 low (clear) 11 10
ns
S0 high and S1 low (count down) 42 40
S0 and S1 high (count up) 42 40
t
h
* Hold time after CLK↑ Data inputs A–H 0 0 ns
t
skew
*
Skew time between S0 and S1
(maximum to avoid inadvertent clear)
8 7 ns
T
A
Operating free-air temperature –55 125 0 70 °C
* On products compliant to MIL-STD-883, Class B, this parameter is based on characterization data but is not production tested.