Datasheet

SN54LVTH18502A, SN54LVTH182502A, SN74LVTH18502A, SN74LVTH182502A
3.3-V ABT SCAN TEST DEVICES
WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS668C − JULY 1996 − REVISED JUNE 2004
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1B4
1B5
1B6
GND
1B7
1B8
1B9
V
CC
2B1
2B2
2B3
2B4
GND
2B5
2B6
2B7
18 19
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
21 22 23 24
63 62 61 60 5964 58 56 55 5457
25 26 27 28 29
53 52
17
51 50 49
30 31 32
1OEAB GND 1CLKAB TDO 1A2 1A1 1LEAB V 1LEBA 1OEBA 1B1 1B2 TMS 1CLKBA GND 1B3
2A9
GND
2LEAB
2CLKAB
2A7 2A8
2OEAB
TDI
2CLKBA
2LEBA
2OEBA
2B9
V
TCK
GND
2B8
1A3
1A4
1A5
GND
1A6
1A7
1A8
1A9
V
CC
2A1
2A2
2A3
GND
2A4
2A5
2A6
CC
CC
SN74LVTH18502A, SN74LVTH182502A . . . PM PACKAGE
(TOP VIEW)
FUNCTION TABLE
†
(normal mode, each register)
INPUTS
OUTPUT
OEAB LEAB CLKAB A
OUTPUT
B
L L L X B
0
‡
L L ↑ LL
L L ↑ HH
L HXLL
L HXHH
H X X X Z
†
A-to-B data flow is shown. B-to-A data flow is similar,
but uses OEBA
, LEBA, and CLKBA.
‡
Output level before the indicated steady-state input
conditions are established