SN74CB3Q3251
1-OF-8 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE HIGH-BANDWIDTH BUS SWITCH
www.ti.com
SCDS173A – AUGUST 2004 – REVISED MARCH 2005
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(1)
For additional information regarding the performance
characteristics of the CB3Q family, refer to the TI application
report, CBT-C, CB3T, and CB3Q Signal-Switch Families,
literature number SCDA008.
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Data and Control Inputs Provide Undershoot
Clamp Diodes
Low Power Consumption (ICC = 1 mA Typ)
VCC Operating Range From 2.3 V to 3.6 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
Ioff 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 Both Digital and Analog
Applications: PCI Interface, Differential Signal
Interface, Memory Interleaving, Bus Isolation,
Low-Distortion Signal Gating
DBQ, DGV, OR PW PACKAGE
(TOP VIEW)
16
2
15
3
14
4
13
5
12
6
7
11
10
8
9
VCC
B5
B6
B7
B8
S0
S1
S2
B4
1
1
B3
B2
B1
A
NC
OE
16
15 B5
14 B6
2
3
4
13 B7
12 B8
11 S0
5
6
10 S1
7
8
NC - No internal connection
9
GND
B4
B3
B2
B1
A
NC
OE
GND
RGY PACKAGE
(TOP VIEW)
VCC
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High-Bandwidth Data Path (up to 500 MHz (1))
Equivalent to IDTQS3VH251 Device
5-V Tolerant I/Os With Device Powered Up or
Powered Down
Low and Flat ON-State Resistance (ron)
Characteristics Over Operating Range
(ron = 4 Ω Typ)
Rail-to-Rail Switching on Data I/O Ports
– 0- to 5-V Switching With 3.3-V VCC
– 0- to 3.3-V Switching With 2.5-V VCC
Bidirectional Data Flow With Near-Zero
Propagation Delay
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(Cio(OFF) = 3.5 pF Typ)
Fast Switching Frequency
(fOE or fS = 20 MHz Max)
S2
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FEATURES
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NC - No internal connection
DESCRIPTION/ORDERING INFORMATION
The SN74CB3Q3251 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of
the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows
for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The device
also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus.
Specifically designed to support high-bandwidth applications, the SN74CB3Q3251 provides an optimized
interface solution ideally suited for broadband communications, networking, and data-intensive computing
systems.
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated
