SN74CBT3257
4 BIT 1 OF 2 FET MULTIPLEXER/DEMULTIPLEXER
SCDS017M − MAY 1995 − REVISED JANUARY 2004
D
5-Ω Switch Connection Between Two Ports
D, DB, DBQ, OR PW PACKAGE
(TOP VIEW)
D
TTL-Compatible Input Levels
RGY PACKAGE
(TOP VIEW)
S
1B1
1B2
1A
2B1
2B2
2A
GND
2
3
4
5
6
7
8
15
14
13
12
11
10
9
S
1
16
V
CC
OE
4B1
4B2
4A
3B1
3B2
3A
1
16
15
OE
14
4B1
13
4B2
12
4A
11
3B1
10
3B2
1B1
1B2
1A
2B1
2B2
2A
2
3
4
5
6
7
8
9
description/ordering information
The SN74CBT3257 is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer. The low
on-state resistance of the switch allows connections to be made with minimal propagation delay.
Output-enable (OE) and select-control (S) inputs select the appropriate B1 and B2 outputs for the A-input data.
ORDERING INFORMATION
TA
QFN − RGY
SOIC − D
−40°C to 85 C
−40 C 85°C
SSOP − DB
SSOP (QSOP) − DBQ
TSSOP − PW
PACKAGE†
Tape and reel
Tube
Tape and reel
Tape and reel
Tape and reel
Tube
Tape and reel
ORDERABLE
PART NUMBER
SN74CBT3257RGYR
SN74CBT3257D
SN74CBT3257DR
SN74CBT3257DBR
SN74CBT3257DBQR
SN74CBT3257PW
SN74CBT3257PWR
CU257
CBT3257
CU257
CU257
TOP-SIDE
MARKING
CU257
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OE
L
L
H
S
L
H
X
FUNCTION
A port = B1 port
A port = B2 port
Disconnect
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
GND
Copyright
2004, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3A
V
CC
1
TI [ TEXAS INSTRUMENTS ]
