SN74LV245ATNSR

具有三态输出的八路总线收发器

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FEATURES

• Inputs Are TTL-Voltage Compatible

• 4.5-V to 5.5-V VCC Operation

• Typical tpd of 3.5 ns at 5 V

• Typical VOLP (Output Ground Bounce)<0.8 V at VCC = 5 V, TA = 25°C

• Typical VOHV (Output VOH Undershoot) >2.3 Vat VCC = 5 V, TA = 25°C

• Supports Mixed-Mode Voltage Operation on All Ports

• Ioff Supports Partial-Power-Down Mode  Operation

• Latch-Up Performance Exceeds 250 mA Per JESD 17

• ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 1000-V Charged-Device Model (C101)

DESCRIPTION

This octal bus transceiver is designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements.

The SN74LV245AT allows data transmission from the A bus to the B bus or from the B bus to the A bus,depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated.

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.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.