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Texas Instruments (TI) Electronic Components Datasheet

SN74BCT2953 Datasheet

Octal Bus Transceiver And Register

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State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
Two 8-Bit, Back-to-Back Registers Store
Data Flowing in Both Directions
A Port Sinks 24 mA and Sources 3 mA
B Port Sinks 64 mA and Sources 15 mA
Inverting Outputs
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
SN74BCT2953
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3ĆSTATE OUTPUTS
SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
DW OR NT PACKAGE
(TOP VIEW)
B8
B7
B6
B5
B4
B3
B2
B1
OEAB
CLKAB
CLKENAB
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 A8
22 A7
21 A6
20 A5
19 A4
18 A3
17 A2
16 A1
15 OEBA
14 CLKBA
13 CLKENBA
The SN74BCT2953 octal bus transceiver contains 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 allows access of the data on the
output port (B port or A port).
The SN74BCT2953 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE†
CLKENAB
H
X
L
INPUTS
CLKAB OEAB
XL
H or L
L
L
A
X
X
L
OUTPUT
B
B0‡
B0‡
H
L
LH
L
X
X HX
Z
A-to-B data flow is shown; B-to-A data flow is similar but
uses CLKENBA, CLKBA, and OEBA.
Level of B before the indicated steady-state input
conditions were established.
logic symbol§
OEBA
CLKENBA
CLKBA
OEAB
CLKENAB
CLKAB
A1
15
13
14
9
11
10
16
17
A2
18
A3
19
A4
20
A5
21
A6
22
A7
23
A8
EN3
G1
1 C5
EN4
G2
2 C6
31
6D 1
5D
4
8
B1
7
B2
6
B3
5
B4
4
B5
3
B6
2
B7
1
B8
§ This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
PRODUCTION DATA information is 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.
Copyright 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
2−1


Texas Instruments (TI) Electronic Components Datasheet

SN74BCT2953 Datasheet

Octal Bus Transceiver And Register

No Preview Available !

SN74BCT2953
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3ĆSTATE OUTPUTS
SCBS105B − DECEMBER 1990 − REVISED NOVEMBER 1993
logic diagram (positive logic)
11
CLKENAB
10
CLKAB
9
OEAB
13
CLKENBA
14
CLKBA
15
OEBA
16
A1
C1
1D
C1
1D
8
B1
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input negative-voltage rating may be exceeded if the input clamp-current rating is observed.
2−2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443


Part Number SN74BCT2953
Description Octal Bus Transceiver And Register
Maker Texas
Total Page 5 Pages
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