SN74AVC4T245DR

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 V to 3.6 V. The SN74AVC4T245 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 bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes. The SN74AVC4T245 is designed for asynchronous communication between two 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 into the high-impedance mode. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port 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 SN74AVC4T245 is designed so that the control pins (1DIR, 2DIR, etc., and 2OE) are supplied by VCCA. This device is fully specified for partial-power-down applications using l0H. 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 VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Applications

• Asynchronous communication
• Low-voltage bidirectional translation
• Partial power-down mode operation

Key features

• Control Inputs IH/IL Levels Are Referenced to VCCA Voltage
• Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.2-V to 3.6-V Power-Supply Range
• I/Os Are 4.6-V Tolerant
• Ioff Supports Partial Power-Down-Mode Operation
• Maximim Data Rates:
• 380 Mbps (1.8-V to 3.3-V Translation)
• 200 Mbps (1.8-V to 3.3-V Translation)
• 200 Mbps (Translate to 2.5 V or 1.8 V)
• 150 Mbps (Translate to 1.5 V)
• 100 Mbps (Translate to 1.2 V)
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22:
• 8000-V Human-Body Model (A114-A)
• 150-V Machine Model (A115-A)
• 1000-V Charged-Device Model (C101)