SN54ABT843, SN74ABT843

9-BIT BUS-INTERFACE D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS197D – FEBRUARY 1991 – REVISED MAY 1997

5

POST OFFICE BOX 655303

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

temperature (unless otherwise noted) (see Figures 1 and 2)

VCC = 5 V,

TA = 25°C

SN54ABT843

SN74ABT843

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

CLR low

5.5

5.5

5.5

tw

Pulse duration

PRE low

4.5

4.5

4.5

ns

LE low

3.3

3.3

3.4

Data before LE

↓

Low

2.5

2.5

2.5

t

Setup time

Data before LE

↓

High

3

3

3

ns

tsu

Setup time

PRE inactive

1.6

1.6

1.6

ns

CLR inactive

2

2

2

th

Hold time data after LE

↓

High

1

1

1

ns

th

Hold time, data after LE

↓

Low

1.5†

2.3†

1.5†

ns

† This data sheet limit may vary among suppliers.

switching characteristics over recommended ranges of supply voltage and operating free-air

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

TA = 25°C

SN54ABT843

SN74ABT843

UNIT

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

D

Q

1.2†

3.8

5.2

1.2†

7.8

1.2†

6.7†

ns

tPHL

D

Q

1.5†

3.4

6.3

1.5†

7.3

1.5†

7.2

ns

tPLH

LE

Q

1.7†

4.4

5.6

1.7†

8.3

1.7†

7.2†

ns

tPHL

LE

Q

1.9†

4.1

6.3

1.3†

7.2

1.9†

6.9

ns

tPLH

PRE

Q

2.2

5

6.2

2.2

8.3

2.2

7.4

ns

tPHL

PRE

Q

2.1†

4.1

6.5

2.1†

7.5

2.1†

7.2

ns

tPLH

CLR

Q

2†

4.4

6.3

2†

7.6

2†

7.1

ns

tPHL

CLR

Q

1.9†

4.5

6.8

1.9†

8.1

1.9†

8

ns

tPZH

OE

Q

1

3.4

4.5†

1

6.4

1

5.7†

ns

tPZL

OE

Q

2

4.3

5.7†

2

6.6

2

6.5

ns

tPHZ

OE

Q

2.4†

4.9

6.2

2.4†

7.3

2.4†

6.8

ns

tPLZ

OE

Q

1.5†

4.2

6.3

1.5†

7

1.5†

5.9†

ns

† This data sheet limit may vary among suppliers.