SN74CB3Q3244
8ĆBIT FET BUS SWITCH
2.5ĆV/3.3ĆV LOWĆVOLTAGE HIGHĆBANDWIDTH BUS SWITCH
SCDS154B − OCTOBER 2003 − REVISED DECEMBER 2004
D
D
D
D
D
† 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.
D Data and Control Inputs Provide
D
D
D
D
D
D
D
D
Undershoot Clamp Diodes
Low Power Consumption
(ICC = 0.7 mA Typical)
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: Differential Signal Interface,
Memory Interleaving, Bus Isolation,
Low-Distortion Signal Gating
RGY PACKAGE
(TOP VIEW)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
1
VCC
2OE
1B1
2A4
1B2
2A3
1B3
2A2
1B4
2A1
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
20
19 2OE
18 1B1
2
3
17 2A4
16 1B2
4
5
15 2A3
14 1B3
6
7
13 2A2
12 1B4
8
9
10
11
GND
1OE
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
GND
1OE
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
2A1
D
(Up To 500 MHz†)
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 Typical)
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 Typical)
Fast Switching Frequency
(fOE = 20 MHz Max)
VCC
D High-Bandwidth Data Path
description/ordering information
The SN74CB3Q3244 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 SN74CB3Q3244 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.
Copyright 2004, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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