SN54BCT25245, SN74BCT25245
25
Ω
OCTAL BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SCBS053B − MAY 1990 − REVISED APRIL 1994
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State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25
Ω
or Greater
Distributed V
CC
and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
SN54BCT25245 . . . JT OR W PACKAGE
SN74BCT25245 . . . DW OR NT PACKAGE
(TOP VIEW)
A1
GND
A2
A3
GND
A4
A5
GND
A6
A7
GND
A8
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DIR
B1
B2
V
CC
B3
B4
B5
B6
V
CC
B7
B8
OE
SN54BCT25245 . . . FK PACKAGE
(TOP VIEW)
The
′BCT25245
is a 25-Ω octal bus transceiver
designed for asynchronous communication
between data buses. It improves both the
performance and density of 3-state memory
address drivers, clock drivers, and bus-oriented
transceivers.
The device allows data transmission 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 disable the device so that both
buses are effectively isolated.
These transceivers are capable of sinking 188-mA
I
OL
, which facilitates switching 25-Ω transmission
lines on the incident wave. The distributed V
CC
and GND pins minimize switching noise for more
reliable system operation.
The SN54BCT25245 is characterized for opera-
tion over the full military temperature range of
−55°C to 125°C. The SN74BCT25245 is
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OE
L
L
H
DIR
L
H
X
B3
V
CC
B2
NC
B1
DIR
A1
B4
B5
B6
NC
V
CC
B7
B8
4
5
6
7
8
9
10
3 2 1 28 27 26
25
24
23
22
21
20
19
11
12 13 14 15 16 17 18
description
OE
A8
GND
NC
A7
A6
GND
NC − No internal connection
OPERATION
B data to A bus
A data to B bus
Isolation
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.
POST OFFICE BOX 655303
POST OFFICE BOX 1443
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HOUSTON, TEXAS 77251−1443
•
DALLAS, TEXAS 75265
GND
A2
A3
NC
GND
A4
A5
Copyright
1994, Texas Instruments Incorporated
2−1
TI [ TEXAS INSTRUMENTS ]
