SN54ABT821, SN74ABT821A

10-BIT BUS-INTERFACE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCBS193E – FEBRUARY 1991 – REVISED MAY 1997

4

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

TA = 25°C

SN54ABT821

SN74ABT821A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

MAX

MIN

MAX

UNIT

VIK

VCC = 4.5 V,

II = –18 mA

–1.2

–1.2

–1.2

V

VCC = 4.5 V,

IOH = –3 mA

2.5

2.5

2.5

VOH

VCC = 5 V,

IOH = –3 mA

3

3

3

V

VOH

VCC =4 5V

IOH = –24 mA

2

2

V

VCC = 4.5 V

IOH = –32 mA

2*

2

VOL

VCC =4 5V

IOL = 48 mA

0.55

0.55

V

VOL

VCC = 4.5 V

IOL = 64 mA

0.55*

0.55

V

Vhys

100

mV

II

VCC = 0 to 5.5 V,

VI = VCC or GND

±1

±1

±1

µA

IOZPU‡

VCC = 0 to 2.1 V, VO = 0.5 to 2.7 V, OE = X

±50*

±50

µA

IOZPD‡

VCC = 2.1 V to 0, VO = 0.5 to 2.7 V, OE = X

±50*

±50

µA

IOZH

VCC = 2.1 V to 5.5 V, VO = 2.7 V, OE ≥ 2 V

10

10

10

µA

IOZL

VCC = 2.1 V to 5.5 V, VO = 0.5 V, OE ≥ 2 V

–10

–10

–10

µA

Ioff

VCC = 0,

VI or VO ≤ 4.5 V

±100

±100

µA

ICEX

VCC = 5.5 V, VO = 5.5 V

Outputs high

50

50

50

µA

IO§

VCC = 5.5 V,

VO = 2.5 V

–50

–100

–180

–50

–180

–50

–180

mA

V5 5 V I

0

Outputs high

1

250

250

250

µA

ICC

VCC = 5.5 V, IO = 0,

VI =VCC or GND

Outputs low

24

38

38

38

mA

VI = VCC or GND

Outputs disabled

0.5

250

250

250

µA

∆ICC¶

VCC = 5.5 V, One input at 3.4 V,

Other inputs at VCC or GND

1.5

1.5

1.5

mA

Ci

VI = 2.5 V or 0.5 V

3.5

pF

Co

VO = 2.5 V or 0.5 V

7.5

pF

* On products compliant to MIL-PRF-38535, this parameter does not apply.

† All typical values are at VCC = 5 V.

‡ This parameter is characterized, but not production tested.

§ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.

¶ This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 1)

VCC = 5 V,

TA = 25°C

SN54ABT821

SN74ABT821A

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

fclock

Clock frequency

0

125

0

125

0

125

MHz

t

Pulse duration CLK high or low

High

2.9

2.9

2.9

ns

tw

Pulse duration, CLK high or low

Low

3.8

3.8

3.8

ns

tsu

Setup time, data before CLK

↑

2.1

2.1

2.1

ns

th

Hold time, data after CLK

↑

1.3

1.3

1.3

ns