SN74AVC4T774

具有可配置电压转换和三态输出的 4 位双电源总线收发器

This 4-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.2 to 3.6 V. The is optimized to operate with VCCA/VCCB set at 1.4 V to 3.6 V. It is operational with VCCA/VCCB as low as 1.2 V. This allows for universal low-voltage bi-directional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.

The SN74AVC4T774 is designed for asynchronous communication between data buses. The logic levels of the direction-control DIR input and the output-enable OE input activate either the B-port outputs or the A-port outputs or place both output ports in the high-impedance mode. The device transmits data from the A bus to the B bus when the B outputs are activated, and from the B bus to the A bus when the A outputs are activated. The input circuitry on both A and B ports is always active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ.

The SN74AVC4T774 is designed so that the control pins DIR1, DIR2, DIR3, DIR4, and OE are supplied by VCCA. 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. The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance state.

To ensure the high-impedance state during power-up or power-down, OE should be tied to VCCA through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. Since this device has CMOS inputs, it is very important to not allow them to float. If the inputs are not driven to either a high VCC state, or a low-GND state, an undesirable larger than expected ICC current may result. Since the input voltage settlement is governed by many factors for example, capacitance, board-layout, package inductance, surrounding conditions, and so forth, ensuring that they these inputs are kept out of erroneous switching states and tying them to either a high or a low level minimizes the leakage-current.

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Each Channel Has an Independent DIR Control Input

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Control Inputs VIH/VIL Levels are

Referenced to VCCA Voltage

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Fully Configurable Dual-Rail Design Allows Each Port to

Operate Over the Full 1.2-V to 3.6-V Power-Supply Range

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I/Os are 4.6-V Tolerant

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Ioff Supports Partial Power-Down-Mode Operation

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Typical Data Rates

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380 Mbps 1.8-V to 3.3-V Translation

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200 Mbps <1.8-V to 3.3-V Translation

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200 Mbps Translate to 2.5 V or 1.8 V

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150 Mbps Translate to 1.5 V

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100 Mbps Translate to 1.2 V

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Latch-Up Performance Exceeds 100 mA Per JESD 78,

Class II

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ESD Protection Exceeds the Following Levels

Tested Per JESD 22

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±8000-V Human-Body Model A114-A

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250-V Machine Model A115-A

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±1500-V Charged-Device Model C101