SN74CB3T3257 - 4位 2 选 1 FET 多路复用器/多路解复用器，具有 5V 容限电平转换器的 2.5V/3.3V 低电压总线开关

SN74CB3T3257是TI德州仪器公司的一款数字多路复用器/多路解复用器产品，SN74CB3T3257是4位 2 选 1 FET 多路复用器/多路解复用器，具有 5V 容限电平转换器的 2.5V/3.3V 低电压总线开关，本站介绍了SN74CB3T3257的封装应用图解、特点和优点、功能等，并给出了与SN74CB3T3257相关的TI元器件型号供参考。

SN74CB3T3257 - 4位 2 选 1 FET 多路复用器/多路解复用器，具有 5V 容限电平转换器的 2.5V/3.3V 低电压总线开关 - 数字多路复用器/多路解复用器 - 多路复用器/多路解复用器(Mux/Demux) - 德州仪器

产品描述

The SN74CB3T3257 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 SN74CB3T3257 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 SN74CB3T3257 is a 4-bit 1-of-2 multiplexer/demultiplexer with a single output-enable (OE)\ input. The select (S) input controls the data path of the multiplexer/demultiplexer. When OE\ is low, the multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE\ is high, the multiplexer/demultiplexer is disabled, 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.

产品特性

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 Typical)
Low Input/Output Capacitance Minimizes Loading (Cio(OFF) = 5 pF Typical)
Data and Control Inputs Provide Undershoot Clamp Diodes
Low Power Consumption (ICC = 20 µA Max)
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, Memory Interleaving, Bus Isolation
Ideal for Low-Power Portable Equipment

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