SN74AVC8T245 8-Bit Dual-Supply Bus Transceiver With Configurable Voltage Translation and 3-State Outputs
ESD Protection Exceeds JESD 8000-V Human-Body Model 200-V Machine Model 1000-V Charged-Device Model (C101)
Control Inputs VIH/VIL Levels Are Referenced to VCCA Voltage
VCC Isolation Feature If Either VCC Input Is at GND, All I/O Ports Are in the High-Impedance State
Ioff Supports Partial Power-Down Mode Operation Fully Configurable Dual-Rail Design Allows Each
Port to Operate Over the Full to 3.6-V Power-Supply Range I/Os Are 4.6-V Tolerant Maximum Data Rates 170 Mbps (VCCA V or VCCB 320 Mbps (VCCA 1.8 V and VCCB 1.8 V)
This 8-bit noninverting bus transceiver uses two separate configurable power-supply rails. The SN74AVC8T245 is optimized to operate with VCCA/VCCB set 3.6 V. The device is operational with VCCA/VCCB as low 1.2 V. The A port is designed to track VCCA. VCCA accepts any supply voltage from 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 3.6 V. This allows for universal low-voltage bidirectional translation between any of the 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVC8T245 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 at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so the buses are effectively isolated.
The SN74AVC8T245 is designed so that the control pins (DIR and OE) are supplied by VCCA.
The SN74AVC8T245 solution is compatible with a single-supply system and can be replaced later with a '245 function, with minimal printed circuit board redesign.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, thus 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, both ports are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE shall be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changed MAX value for Operating free-air temperature, TA from: 85°C to: : 5 Added values for +125°C in Electrical Characteristics and all Switching Characteristics tables : 6 Added Documentation Support section, Receiving Notification of Documentation Updates, and Community
Added Pin Configuration and Functions section, ESD Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section : 1
DESCRIPTION
3-state output-mode enables. Pull OE high to place all outputs in 3-state mode. Referenced to VCCA.
Required
