SN74CB3T3253_15 Datasheet, PDF (1/20 Pages) Texas Instruments – DUAL 1-OF-4 FET MULTIPLEXER/DEMULTIPLEXER

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SN74CB3T3253
DUAL 1-OF-4 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V TOLERANT LEVEL SHIFTER
SCDS148 – OCTOBER 2003 – REVISED JUNE 2005
FEATURES
• Output Voltage Translation Tracks V_CC
• 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
• 5-V Tolerant I/Os With Device Powered Up or
Powered Down
• Bidirectional Data Flow With Near-Zero
Propagation Delay
• Low ON-State Resistance (r_on) Characteristics
(r_on = 5 Ω Typ)
• Low Input/Output Capacitance Minimizes
Loading (C_io(OFF) = 5 pF Typ)
• Data and Control Inputs Provide Undershoot
Clamp Diodes
• Low Power Consumption (I_CC = 20 µA Max)
• V_CC 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
• I_off 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, Memory
Interleaving, Bus Isolation
• Ideal for Low-Power Portable Equipment
D, DBQ, DGV, OR PW PACKAGE
(TOP VIEW)
1OE 1
S1 2
1B4 3
1B3 4
1B2 5
1B1 6
1A 7
GND 8
16 V_CC
15 2OE
14 S0
13 2B4
12 2B3
11 2B2
10 2B1
9 2A
DESCRIPTION/ORDERING INFORMATION
The SN74CB3T3253 is a high-speed TTL-compatible FET multiplexer/demultiplexer 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 SN74CB3T3253 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 SN74CB3T3253 is organized as two 1-of-4 multiplexer/demultiplexers with separate output-enable (1OE,
2OE) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When OE is low,
the associated multiplexer/demultiplexer is ON, and the A port is connected to the B port, allowing bidirectional
data flow between ports. When OE is high, the associated multiplexer/demultiplexer is OFF, and a
high-impedance state exists between the A and B ports.
This device is fully specified for partial-power-down applications using I_off. The I_off feature ensures that damaging
current will not backflow through the device when it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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 © 2003–2005, Texas Instruments Incorporated