Texas Instruments SN74AXCH2T45 Dual-Supply Bus Transceiver

Texas Instruments SN74AXCH2T45 Dual-Supply Bus Transceiver is a two-bit, non-inverting bus transceiver that uses two individually configurable power-supply rails. The device is operational with V_CCA and V_CCB supplies as low as 0.65V. The A port is designed to track V_CCA, which accepts any supply voltage from 0.65V to 3.6V. The B port is designed to track V_CCB, which also accepts any supply voltage from 0.65V to 3.6V. The SN74AXCH2T45 is also compatible with a single-supply system. The Texas Instruments SN74AXCH2T45 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level of the direction-control input (DIR). The SN74AXCH2T45 is designed to reference the control pin (DIR) to V_CCA.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Using pullup or pulldown resistors with the bus-hold circuitry is not recommended. If a supply is present for V_CCA or V_CCB, the bus-hold circuitry always remains active on the A or B inputs, respectively, independent of the state of the direction control pin. The device is fully specified for partial-power-down applications using the I_off current. The I_off protection circuitry ensures that no excessive current is drawn from or to an input, output, or combined I/O that is biased to a specific voltage while the device is powered down. The V_CC isolation feature ensures that if either V_CCA or V_CCB is less than 100mV, both I/O ports enter a high-impedance state by disabling the device's outputs. Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance.

Features

Fully configurable dual-rail design allows each port to operate with a power supply range from 0.65V to 3.6V
Operating temperature from -40°C to +125°C
Glitch-free power supply sequencing
Up to 380Mbps support when translating from 1.8V to 3.3V
V_CC isolation feature
If either V_CC input is below 100mV, all I/O outputs are disabled and become high-impedance

I_off supports partial-power-down mode operation
Compatible with AVC family-level shifters
Latch-up performance exceeds 100mA per JESD 78, Class II
ESD protection exceeds JESD 22
- 8000V human-body model (HBM)
- 1000V charged-device model (CDM)