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ꢊꢅꢋ ꢆ ꢌ ꢊꢍ ꢎꢊ ꢈ ꢎ ꢏꢆ ꢐ ꢑꢒꢆ ꢋꢓ ꢒꢏ ꢔꢏꢕꢖ ꢗꢏꢐ ꢑꢒꢆꢋ ꢓ ꢒꢏ ꢔꢏ ꢕ
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SCDS017M − MAY 1995 − REVISED JANUARY 2004
D
5-Ω Switch Connection Between Two Ports
D
TTL-Compatible Input Levels
D, DB, DBQ, OR PW PACKAGE
(TOP VIEW)
RGY PACKAGE
(TOP VIEW)
V
S
1B1
1B2
1A
2B1
2B2
2A
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
OE
4B1
4B2
4A
3B1
3B2
3A
1
16
1B1
1B2
1A
2B1
2B2
2A
15
14
13
12
11
10
2
3
4
5
6
7
OE
4B1
4B2
4A
3B1
3B2
GND
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
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
QFN − RGY
Tape and reel
SN74CBT3257RGYR
SN74CBT3257D
CU257
Tube
SOIC − D
CBT3257
Tape and reel
Tape and reel
SN74CBT3257DR
SN74CBT3257DBR
SN74CBT3257DBQR
SN74CBT3257PW
SSOP − DB
CU257
CU257
−40°C to 85°C
SSOP (QSOP) − DBQ Tape and reel
Tube
TSSOP − PW
CU257
Tape and reel
SN74CBT3257PWR
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
FUNCTION
OE
L
S
L
A port = B1 port
A port = B2 port
Disconnect
L
H
X
H
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.
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