Datasheet

SN54LVTH18504A, SN54LVTH182504A, SN74LVTH18504A, SN74LVTH182504A
3.3-V ABT SCAN TEST DEVICES
WITH 20-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS667B – JULY 1996 – REVISED JUNE 1997
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
A1 GND LEBA TDO A3 A2 OEBA V CLKENBA B1 B2 B3 TMS CLKBA GND B4
A19
GND
CLKENAB
CLKAB
A17 A18 A20
TDI
LEAB
OEAB
B20 B19
V
TCK
GND
B18
A4
A5
A6
GND
A7
A8
A9
A10
V
CC
A11
A12
A13
GND
A14
A15
A16
B5
B6
B7
GND
B8
B9
B10
V
CC
B11
B12
B13
B14
GND
B15
B16
B17
CC
CC
SN74LVTH18504A, SN74LVTH182504A . . . PM PACKAGE
(TOP VIEW)
FUNCTION TABLE
†
(normal mode, each register)
INPUTS
OUTPUT
OEAB LEAB CLKENAB CLKAB A
B
L L L L X B
0
‡
L LL ↑ LL
L LL ↑ HH
L LH XXB
0
‡
L HX XLL
L HX XHH
H X X X X Z
†
A-to-B data flow is shown. B-to-A data flow is similar, but uses
OEBA
, LEBA, CLKENBA, and CLKBA.
‡
Output level before the indicated steady-state input conditions were
established