Texas Instruments SN74F543DBLE, SN74F543DBR, SN74F543DW, SN74F543DWR, SN74F543NT Datasheet

SN74F543

OCTAL REGISTERED TRANSCEIVER

WITH 3-STATE OUTPUTS

SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993

Copyright  1993, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• 3-State True Outputs

• Back-to-Back Registers for Storage

• Package Options Include Plastic

Small-Outline and Shrink Small-Outline
Packages and Standard Plastic 300-mil
DIPs

description

The SN74F543 octal transceiver contains two
sets of D-type latches for temporary storage of
data flowing in either direction. Separate
latch-enable (LEAB

or LEBA) and output enable

(OEAB

or OEBA) inputs are provided for each
register to permit independent control in either
direction of data flow. The A outputs are
characterized to sink 24 mA while the B outputs
are characterized to sink 64 mA.

The A-to-B enable (CEAB

) input must be low in order to enter data from A or to output data from B. Having CEAB
low and LEAB low makes the A-to-B latches transparent; a subsequent low-to-high transition of LEAB puts the
A latches in the storage mode. With CEAB

and OEAB both low, the 3-state B outputs are active and reflect the

data present at the output of the A latches. Data flow from B to A is similar, but requires using the CEBA

, LEBA,

and OEBA

inputs.

The SN74F543 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN74F543 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

†

INPUTS

OUTPUT

CEAB LEAB OEAB A

B

H X X X Z
X XHX Z
LHLXB

0

‡

LLLL L
LLLHH

†

A-to-B data flow is shown; B-to-A flow control is the
same except that it uses CEBA

, LEBA, and OEBA.

‡

Output level before the indicated steady-state input
conditions were established.

DB, DW, OR NT PACKAGE

(TOP VIEW)

1
2
3
4
5
6
7
8
9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

LEBA

OEBA

A1
A2
A3
A4
A5
A6
A7
A8

CEAB

GND

V

CC

CEBA
B1
B2
B3
B4
B5
B6
B7
B8
LEAB
OEAB

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SN74F543
OCTAL REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS

SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

4

2C6

14

3

A1

4

A2

B1

22

5D

5

A3

6

A4

7

A5

8

A6

9

A7

10

A8

B2

21

B3

20

B5

18

B4

19

B6

17

B8

15

B7

16

LEAB

3

G2

11

CEAB

2EN4

13

OEAB

1C5

1

LEBA

G1

23

CEBA

1EN3

2

OEBA

6D

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

logic diagram (positive logic)

OEBA

CEBA

LEBA

OEAB

CEAB

LEAB

A1

B1

C1
1D

C1
1D

2

23

1

13

11

14

3

22

To Seven Other Channels

SN74F543

OCTAL REGISTERED TRANSCEIVER

WITH 3-STATE OUTPUTS

SDFS025B – D2942, MARCH 1987 – REVISED OCTOBER 1993

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

†

Supply voltage range, V

CC

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, V

I

(excluding I/O ports) (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current range, I

IK

–30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state –0.5 V to V

CC

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

Current into any output in the low state: A1–A8 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B1–B8 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input-voltage ratings may be exceeded provided the input-current ratings are observed.

recommended operating conditions

MIN NOM MAX UNIT

V

CC

Supply voltage 4.5 5 5.5 V

V

IH

High-level input voltage 2 V

V

IL

Low-level input voltage 0.8 V

I

IK

Input clamp current –18 mA

p

A1–A8 –3

IOHHigh-level output current

B1–B8 –15

mA

p

A1–A8 24

IOLLow-level output current

B1–B8 64

mA

T

A

Operating free-air temperature 0 70 °C