SN74CBT3257C
4 BIT 1 OF 2 FET MULTIPLEXER/DEMULTIPLEXER
5 V BUS SWITCH WITH 2 V UNDERSHOOT PROTECTION
SCDS137 − OCTOBER 2003
D
Undershoot Protection for Off-Isolation on
D
D
D
D
D
D
D
D
D
D
D
A and B Ports Up To −2 V
Bidirectional Data Flow, With Near-Zero
Propagation Delay
Low ON-State Resistance (r
on
)
Characteristics (r
on
= 3
Ω
Typical)
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(C
io(OFF)
= 5.5 pF Typical)
Data and Control Inputs Provide
Undershoot Clamp Diodes
Low Power Consumption
(I
CC
= 3
µA
Max)
V
CC
Operating Range From 4 V to 5.5 V
Data I/Os Support 0 to 5-V Signaling Levels
(0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)
Control Inputs Can be Driven by TTL or
5-V/3.3-V CMOS Outputs
I
off
Supports Partial-Power-Down Mode
Operation
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
− 1000-V Charged-Device Model (C101)
Supports I
2
C Bus Expansion
Supports Both Digital and Analog
Applications: USB Interface, Bus Isolation,
Low-Distortion Signal Gating
D, DB, DBQ, OR PW PACKAGE
(TOP VIEW)
S
1B1
1B2
1A
2B1
2B2
2A
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OE
4B1
4B2
4A
3B1
3B2
3A
RGY PACKAGE
(TOP VIEW)
S
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
D
D
description/ordering information
ORDERING INFORMATION
TA
QFN − RGY
SOIC − D
−40 C 85°C
−40°C to 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
SN74CBT3257CRGYR
SN74CBT3257CD
SN74CBT3257CDR
SN74CBT3257CDBR
SN74CBT3257CDBQR
SN74CBT3257CPW
SN74CBT3257CPWR
CU257C
CBT3257C
CU257C
CU257C
TOP-SIDE
MARKING
CU257C
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
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.
Copyright
2003, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
GND
3A
V
CC
1
TI [ TEXAS INSTRUMENTS ]
