SN54AS867, SN54AS869

SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869

SYNCHRONOUS 8-BIT UP/DOWN COUNTERS

SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995

12

POST OFFICE BOX 655303

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 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

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

IOH

High-level output current

–2

–2

mA

IOL

Low-level output current

20

20

mA

fclock*

Clock frequency

0

40

0

50

MHz

tw(clock)*

Pulse duration, CLK high or low

12.5

10

ns

tw(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

tsu*

Setup time before 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

th*

Hold time after CLK

↑

Data inputs A – H

0

0

ns

tskew*

Skew time between S0 and S1

(maximum to avoid inadvertent clear)

8

7

ns

TA

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.