SN54AS821A, SN74AS821A

10-BIT BUS-INTERFACE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SDAS230A – DECEMBER 1983 – REVISED AUGUST 1995

3

POST OFFICE BOX 655303

recommended operating conditions

SN54AS821A

SN74AS821A

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

–24

–24

mA

IOL

Low-level output current

32

48

mA

tw*

Pulse duration, CLK high or low

9

8

ns

tsu*

Setup time, data before CLK

↑

7

6

ns

th*

Hold time, data after CLK

↑

0

0

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.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54AS821A

SN74AS821A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

– 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = – 2 mA

VCC –2

VCC –2

VOH

VCC =4 5V

IOH = – 15 mA

2.4

3.2

2.4

3.2

V

VCC = 4.5 V

IOH = – 24 mA

2

2

VOL

VCC =4 5V

IOL = 32 mA

0.25

0.5

V

VOL

VCC = 4.5 V

IOL = 48 mA

0.35

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

50

µA

IOZL

VCC = 5.5 V,

VI = 0.4 V

–50

–50

µA

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

VCC = 5.5 V,

VI = 0.4 V

– 0.5

– 0.5

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

–30

–112

–30

–112

mA

Outputs high

55

88

55

88

ICC

VCC = 5.5 V

Outputs low

68

109

68

109

mA

Outputs disabled

70

113

70

113

† All typical values are at VCC = 5 V, TA = 25°C.

‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.