Datasheet
SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
8
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
: SN74ALS867A 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
SN74ALS867A
UNIT
MIN NOM MAX
UNIT
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 –0.4 mA
I
OL
Low-level output current 8 mA
f
clock
Clock frequency 0 35 MHz
t
w(clock)
Pulse duration, CLK high or low 14 ns
t
w(clear)
Pulse duration of clear pulse, S0 and S1 low 10 ns
Data inputs A–H 10
ENP or ENT 15
t
su
Setup time before CLK↑
S0 low and S1 high (load)
12
ns
S0 high and S1 low (count down) 12
S0 and S1 high (count up) 12
t
h
Hold time after CLK↑
S0 high after S1↑ or S1 high after S0↑ 3
ns
t
h
H
o
ld
t
i
me a
f
ter
CLK↑
Data inputs A–H 0
ns
T
A
Operating free-air temperature 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74ALS867A
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
‡
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.2 V
V
OH
V
CC
= 4.5 V to 5.5 V, I
OH
= –0.4 mA V
CC
–2 V
V
OL
V
CC
=45V
I
OL
= 4 mA 0.25 0.4
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 8 mA 0.35 0.5
V
I
I
V
CC
= 5.5 V, V
I
= 7 V 0.1 mA
I
IH
V
CC
= 5.5 V, V
I
= 2.7 V 20 µA
I
IL
V
CC
= 5.5 V, V
I
= 0.4 V –0.2 mA
I
O
§
V
CC
= 5.5 V, V
O
= 2.25 V –30 –112 mA
I
CC
V
CC
= 5.5 V 28 45 mA
‡
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.