VOL

V

SN74AS1821

10BIT BUS INTERFACE FLIPFLOPS WITH 3STATE OUTPUTS

SDAS131 − APRIL 1987

POST OFFICE BOX 655303

3

absolute maximum ratings over operating free-air temperature range (uness otherwise noted)

7V

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

Input voltage

7 V

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

Voltage applied to a disabled 3-state output

5.5 V

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

Operating free-air temperature range

0

°C to 70°C

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

Storage temperature range

−65

°C to 150°C

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

recommended operating conditions

MIN

NOM

MAX

UNIT

VCC

Supply Voltage

4.5

5

5.5

V

VIH

High-level input voitage

2

V

VIL

Low-level input voltage

0.8

V

VOH

High-level output current

−24

mA

IOL

Low-level output current

48

mA

tw

Pulse duration, CLK high or low

8

ns

tsu

Setup time, data before CLK

↑

6

ns

th

Hold time, data after CLK

↑

0

ns

TA

Operating free-air temperature

0

70

°C

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

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V

II = −18 mA

−1.2

V

VCC = 4.5 V to 5.5 V,

IOH = −2mA

VCC−2

VOH

VCC = 4.5 V,

IOH = −15 mA

2.4

3.2

V

VCC = 4.5 V,

IOH = −24 mA

2

VCC = 4.5 V,

IOL = 32 mA

VCC = 4.5 V,

IOL = 48 mA

0.35

0.5

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

µA

IOZL

VCC = 5.5 V,

VO = 0.4 V

−50

µA

II

VCC = 5.5 V,

VI = 7 V

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

µA

IL

VCC = 5.5 V,

VI = 0.4 V

0.5

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

−30

−112

mA

Outputs high

55

88

ICC

VCC 5.5 V

Outputs low

68

09

mA

Outputs disabled

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, I[OS]