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 SN74AVCH4T245 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 SN74AVCH4T245 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.
Control Inputs VIH/VIL 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
Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
Max Data Rates
380 Mbps (1.8V to 3.3V Translation)
200 Mbps (<1.8V to 3.3V Translation)
200 Mbps (Translate to 2.5V or 1.8V)
150 Mbps (Translate to 1.5V)
100 Mbps (Translate to 1.2V)
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II