SN74CB3T16211

具有 5V 容限电平转换器的 24 位 FET 2.5V/3.3V 低电压总线开关

The 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 SN74CB3T16211 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels.

The I/O port of this device has a pullup current source that maintains the output voltage at VCC when the device is ON, and the input is greater than or equal to VCC – 1. Because of the pullup current source, the output voltage level may be less than VCC when the operating frequency is low and the I/O port is connected to a pulldown resistor. In order to maintain the output voltage at VCC, a pullup resistor must be connected to VCC instead of a pulldown resistor to ground.

The SN74CB3T16211 is organized as two 12-bit bus switches with separate output-enable 1OE, 2OE inputs. It can be used as two 12-bit bus switches or as one 24-bit bus switch. When OE is low, the associated 12-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 12-bit bus switch 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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Member of the Texas Instruments Widebus Family

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Output Voltage Translation Tracks VCC

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Supports Mixed-Mode Signal Operation on

All Data I/O Ports

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5-V Input Down to 3.3-V Output Level

Shift With 3.3-V VCC

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5-V/3.3-V Input Down to 2.5-V Output

Level Shift With 2.5-V VCC

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5-V Tolerant I/Os With Device Powered Up

or Powered Down

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Bidirectional Data Flow With Near-Zero

Propagation Delay

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Low ON-State Resistance ron Characteristics

ron = 5 Ω Typ

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Low Input/Output Capacitance Minimizes

Loading CioOFF = 5 pF Typ

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Data and Control Inputs Provide

Undershoot Clamp Diodes

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Low Power Consumption

ICC = 70 µA Max

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VCC Operating Range From 2.3 V to 3.6 V

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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

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Control Inputs Can Be Driven by TTL

or 5-V/3.3-V CMOS Outputs

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Ioff Supports Partial-Power-Down Mode Operation

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Latch-Up Performance Exceeds 250 mA Per JESD 17

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ESD Performance Tested Per JESD 22

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2000-V Human-Body Model A114-B, Class II

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1000-V Charged-Device Model C101

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Supports Digital Applications: Level

Translation, PCI Interface, Bus Isolation

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Ideal for Low-Power Portable Equipment