SN74CB3T3306
www.ti.com
SCDS119B – JANUARY 2003 – REVISED AUGUST 2012
DUAL FET BUS SWITCH 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH
WITH 5-V TOLERANT LEVEL SHIFTER
Check for Samples: SN74CB3T3306
FEATURES
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Output Voltage Translation Tracks VCC
Supports Mixed-Mode Signal Operation
on All Data I/O Ports
– 5-V Input Down to 3.3-V Output Level
Shift With 3.3-V VCC
– 5-V/3.3-V Input Down to 2.5-V Output
Level Shift With 2.5-V VCC
5-V Tolerant I/Os With Device Powered Up
or Powered Down
Bidirectional Data Flow With Near-Zero
Propagation Delay
Low ON-State Resistance (ron)
Characteristics (ron = 5 Ω Typ)
Low Input/Output Capacitance Minimizes
Loading (Cio(OFF) = 4.5 pF Typ)
Data and Control Inputs Provide
Undershoot Clamp Diodes
Low Power Consumption
(ICC = 20 μA Max)
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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 250 mA Per
JESD 17
ESD Performance Tested Per JESD 22
– 2000-V Human-Body Model
(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
Supports Digital Applications: Level
Translation, USB Interface, Bus Isolation
Ideal for Low-Power Portable Equipment
DCT OR DCU PACKAGE
(TOP VIEW)
1OE
1A
1B
GND
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8
2
7
3
6
4
5
VCC
2OE
2B
2A
DESCRIPTION/ORDERING INFORMATION
The SN74CB3T3306 is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing
for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by
providing voltage translation that tracks VCC. The SN74CB3T3306 supports systems using 5-V TTL, 3.3-V
LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1).
The SN74CB3T3306 is organized as two 1-bit bus switches with separate ouput-enable (1OE, 2OE) inputs. It
can be used as two 1-bit bus switches or as one 2-bit bus switch. When OE is low, the associated 1-bit bus
switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE
is high, the associated 1-bit bus switch is OFF, and a high-impedance state exists between the A and B ports.
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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 © 2003–2012, Texas Instruments Incorporated
