Philips Semiconductors

Product specification

74ABT543A

Octal latched transceiver with dual enable

(3-State)

2

1998 Sep 24

853-1794 20080

FEATURES

and 200 V per Machine Model

DESCRIPTION

The 74ABT543A high-performance BiCMOS device combines low

static and dynamic power dissipation with high speed and high

output drive.

The 74ABT543A Octal Registered Transceiver contains two sets of

D-type latches for temporary storage of data flowing in either

direction. Separate Latch Enable (LEAB, LEBA) and Output Enable

(OEAB, OEBA) inputs are provided for each register to permit

independent control of data transfer in either direction. The outputs

are guaranteed to sink 64mA.

FUNCTIONAL DESCRIPTION

The 74ABT543A contains two sets of eight D-type latches, with

separate control pins for each set. Using data flow from A to B as an

example, when the A-to-B Enable (EAB) input and the A-to-B Latch

Enable (LEAB) input are Low the A-to-B path is transparent. A

subsequent Low-to-High transition of the LEAB signal puts the A

data into the latches where it is stored and the B outputs no longer

change with the A inputs. With EAB and OEAB both Low, the

3-State B output buffers are active and display the data present at

the outputs of the A latches.

Control of data flow from B to A is similar, but using the EBA, LEBA,

and OEBA inputs.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

Propagation delay

An to Bn or Bn to An

2.9

3.6

ns

Input capacitance

4

pF

I/O capacitance

Outputs disabled;

7

pF

Total supply current

110

µA

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

OUTSIDE NORTH AMERICA

NORTH AMERICA

DWG NUMBER

24-Pin Plastic DIP

–40

°C to +85°C

74ABT543A N

74ABT543A N

SOT222-1

24-Pin plastic SO

–40

°C to +85°C

74ABT543A D

74ABT543A D

SOT137-1

24-Pin Plastic SSOP Type II

–40

°C to +85°C

74ABT543A DB

74ABT543A DB

SOT340-1

24-Pin Plastic TSSOP Type I

–40

°C to +85°C

74ABT543A PW

7ABT543APW DH

SOT355-1

PIN CONFIGURATION

24

23

22

21

20

19

18

17

16

10

15

9

8

7

6

5

4

3

2

1

VCC

EBA

B0

B1

B2

B3

B4

B5

B6

B7

OEBA

A0

A1

A2

A3

A4

A5

A6

A7

LEBA

14

12

13

11

LEAB

OEAB

EAB

GND

SA00168

PIN DESCRIPTION

PIN NUMBER

SYMBOL

FUNCTION

14, 1

LEAB / LEBA

A to B / B to A Latch Enable

input (active-Low)

11, 23

EAB / EBA

A to B / B to A Enable input

(active-Low)

13, 2

OEAB / OEBA

A to B / B to A Output Enable

input (active-Low)

3, 4, 5, 6,

7, 8, 9, 10

A0 – A7

Port A, 3-State outputs

22, 21, 20, 19,

18, 17, 16, 15

B0 – B7

Port B, 3-State outputs

12

GND

Ground (0V)

24

Positive supply voltage