sn74cb3t3306 Datasheet, PDF (1/12 Pages) Texas Instruments – DUAL FET BUS SWITCH 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V TOLERANT LEVEL SHIFTER

SN74CB3T3306
DUAL FET BUS SWITCH
2.5ĆV/3.3ĆV LOWĆVOLTAGE BUS SWITCH WITH 5ĆV TOLERANT LEVEL SHIFTER
SCDS119A − JANUARY 2003 − REVISED OCTOBER 2003
D Output Voltage Translation Tracks V_CC
D 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 V_CC
− 5-V/3.3-V Input Down To 2.5-V Output
Level Shift With 2.5-V V_CC
D 5-V Tolerant I/Os With Device Powered-Up
or Powered-Down
D Bidirectional Data Flow, With Near-Zero
Propagation Delay
D Low ON-State Resistance (r_on)
Characteristics (r_on = 5 Ω Typical)
D Low Input/Output Capacitance Minimizes
Loading (C_io(OFF) = 4.5 pF Typical)
D Data and Control Inputs Provide
Undershoot Clamp Diodes
D V_CC Operating Range From 2.3 V to 3.6 V
D 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)
D Control Inputs Can be Driven by TTL or
5-V/3.3-V CMOS Outputs
D I_off Supports Partial-Power-Down Mode
Operation
D Latch-Up Performance Exceeds 250 mA Per
JESD 17
D ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
− 1000-V Charged-Device Model (C101)
D Supports Digital Applications: Level
Translation, USB Interface, Bus Isolation
D Ideal for Low-Power Portable Equipment
D Low Power Consumption
(I_CC = 20 µA Max)
DCT OR DCU PACKAGE
(TOP VIEW)
1OE 1
1A 2
1B 3
GND 4
8 V_CC
7 2OE
6 2B
5 2A
description/ordering information
The SN74CB3T3306 is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r_on),
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 V_CC. 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.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING‡
−40°C to 85°C
SSOP − DCT Tape and reel SN74CB3T3306DCTR
VSSOP − DCU Tape and reel SN74CB3T3306DCUR
WA6_ _ _
WA6_
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design}
guidelines are available at www.ti.com/sc/package.
‡ _{DCT: The actual top-side marking has three additional characters that designate the year, month, and}
assembly/test site.
DCU: The actual top-side marking has one additional character that designates the assembly/test site.
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.
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Copyright  2003, Texas Instruments Incorporated
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