SN54LVTH18512, SN54LVTH182512, SN74LVTH18512, SN74LVTH182512

3.3-V ABT SCAN TEST DEVICES

WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS

SCBS671B – AUGUST 1996 – REVISED OCTOBER 1997

11

POST OFFICE BOX 655303

device-identification register

The device-identification register (IDR) is 32 bits long. It can be selected and read to identify the manufacturer,

part number, and version of this device.

For the ’LVTH18512, the binary value 00000000000000111011000000101111 (0003B02F, hex) is captured

(during Capture-DR state) in the IDR to identify this device as Texas Instruments SN54/74LVTH18512.

For the ’LVTH182512, the binary value 00000000000000111100000000101111 (0003C02F, hex) is captured

(during Capture-DR state) in the device-identification register to identify this device as Texas Instruments

SN54/74LVTH182512.

The IDR order of scan is from TDI through bits 31–0 to TDO. Table 2 shows the IDR bits and their significance.

Table 2. Device-Identification Register Configuration

IDR BIT

NUMBER

IDENTIFICATION

SIGNIFICANCE

IDR BIT

NUMBER

IDENTIFICATION

SIGNIFICANCE

IDR BIT

NUMBER

IDENTIFICATION

SIGNIFICANCE

31

VERSION3

27

PARTNUMBER15

11

MANUFACTURER10†

30

VERSION2

26

PARTNUMBER14

10

MANUFACTURER09†

29

VERSION1

25

PARTNUMBER13

9

MANUFACTURER08†

28

VERSION0

24

PARTNUMBER12

8

MANUFACTURER07†

––

––

23

PARTNUMBER11

7

MANUFACTURER06†

––

––

22

PARTNUMBER10

6

MANUFACTURER05†

––

––

21

PARTNUMBER09

5

MANUFACTURER04†

––

––

20

PARTNUMBER08

4

MANUFACTURER03†

––

––

19

PARTNUMBER07

3

MANUFACTURER02†

––

––

18

PARTNUMBER06

2

MANUFACTURER01†

––

––

17

PARTNUMBER05

1

MANUFACTURER00†

––

––

16

PARTNUMBER04

0

LOGIC1†

––

––

15

PARTNUMBER03

––

––

––

––

14

PARTNUMBER02

––

––

––

––

13

PARTNUMBER01

––

––

––

––

12

PARTNUMBER00

––

––

† Note that for TI products, bits 11–0 of the device-identification register always contain the binary value 000000101111

(02F, hex).