See datasheet for actual packaging/pinout drawings

Packaging

Package | PIN:

DGV | 16

Temp:

I (-40 to 85)

ECO Plan:

Green (RoHS & no Sb/Br)

SN74CB3T3253DGVR


Dual 1-of-4 FET Mult/Demult 2.5-V/3.3-V Low-Voltage Bus Switch with 5-V Tolerant Level Shifter

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Texas Instruments SN74CB3T3253DGVR

The SN74CB3T3253 is a high-speed TTL-compatible FET multiplexer/demultiplexer 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 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 Ioff. The Ioff 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 VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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