1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

B8

B7

B6

B5

B4

B3

B2

B1

OEAB

CLKAB

CLKENAB

GND

A8

A7

A6

A5

A4

A3

A2

A1

OEBA

CLKBA

CLKENBA

SN54LVT2952 . . . JT PACKAGE

SN74LVT2952 . . . DB, DW, OR PW PACKAGE

(TOP VIEW)

32 1 28 27

12 13 14 15 16 17 18

5

6

7

8

9

10

11

25

24

23

22

21

20

19

A6

A5

A4

NC

A3

A2

A1

B5

B4

B3

NC

B2

B1

OEAB

426

SN54LVT2952 . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

SN54LVT2952, SN74LVT2952

3.3V ABT OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3STATE OUTPUTS

SCBS152E − MAY 1992 − REVISED JULY 1995

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Technology (ABT) Design for 3.3-V

Operation and Low-Static Power

Dissipation

Down to 2.7 V

MIL-STD-883C, Method 3015; Exceeds

200 V Using Machine Model

(C = 200 pF, R = 0)

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 (JT) DIPs

description

These octal bus transceivers and registers are

operation, but with the capability to provide a TTL

interface to a 5-V system environment.

The ’LVT2952 consist of two 8-bit back-to-back

registers that store data flowing in both directions

between two bidirectional buses. Data on the A or

B bus is stored in the registers on the low-to-high

transition of the clock (CLKAB or CLKBA) input provided that the clock-enable (CLKENAB or CLKENBA) input

is low. Taking the output-enable (OEAB or OEBA) input low accesses the data on either port.

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

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN74LVT2952 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 SN54LVT2952 is characterized for operation over the full military temperature range of −55

°C to 125°C.

The SN74LVT2952 is characterized for operation from − 40

°C to 85°C.

Copyright

 1995, Texas Instruments Incorporated

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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.