●This 16-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 1.65 V to 5.5 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65 V to 5.5 V. This allows for universal low-voltage bidirectional translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes.
●The SN74LVCH16T245 device control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by VCCA.
●The SN74LVCH16T245 device 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.
●Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry on the powered-up side always stays active.
●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 all outputs 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.
● Control Inputs VIH/VIL Levels are Referenced to
●VCCA Voltage
● VCC Isolation Feature If Either VCC Input is at
●GND, All Outputs are in the High-Impedance State
● Overvoltage-Tolerant Inputs and Outputs Allow
●Mixed-Voltage-Mode Data Communications
● Fully Configurable Dual-Rail Design Allows Each
●Port to Operate Over the Full 1.65 V to 5.5 V
●Power-Supply Range
● Bus Hold on Data Inputs Eliminates the Need for
●External Pullup and Pulldown Resistors
● Ioff Supports Partial-Power-Down Mode Operation
● Latch-Up Performance Exceeds 100 mA Per
●JESD 78, Class II
● ESD Protection Exceeds JESD 22
