SN54LVTR245, SN74LVTR245

3.3-V ABT OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCAS428 – OCTOBER 1993

Copyright

1

POST OFFICE BOX 655303

Technology (ABT) Design for 3.3-V

Operation and Low-Static Power

Dissipation

(5-V Input and Output Voltages With

Down to 2.7 V

Per JEDEC Standard JESD-17

for External Pullup Resistors

Small-Outline (DW), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages, Ceramic Chip Carriers (FK), and

Ceramic DIPs (J)

description

These octal bus transceivers are designed

but with the capability to provide a TTL interface to

a 5-V system environment.

The

′LVTR245 is designed for asynchronous communication between data buses. The device transmits data

from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction-control

(DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The A port is designed to minimize the undershoot exhibited on high to low transition during simultaneous

switching conditions.

The SN74LVTR245 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 SN54LVTR245 is characterized for operation over the full military temperature range of – 55

°C to 125°C.

The SN74LVTR245 is characterized for operation from – 40

°C to 85°C.

FUNCTION TABLE

INPUTS

OPERATION

OE

DIR

OPERATION

L

L

B data to A bus

L

H

A data to B bus

H

X

Isolation

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

DIR

A1

A2

A3

A4

A5

A6

A7

A8

GND

OE

B1

B2

B3

B4

B5

B6

B7

B8

SN54LVTR245 ...J PACKAGE

SN74LVTR245 . . . DB, DW, OR PW PACKAGE

(TOP VIEW)

32

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

B1

B2

B3

B4

B5

A3

A4

A5

A6

A7

SN54LVTR245 . . . FK PACKAGE

(TOP VIEW)

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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.