SCES785E December 2008 – November 2023 SN74AVC8T245-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The SN74AVC8T245-Q1 is an
8-bit noninverting bus transceiver that uses two separate configurable power-supply
rails. The SN74AVC8T245-Q1 operation is optimal with VCCA and
VCCB set at
1.4 V to 3.6 V. It is
operational with VCCA and VCCB as low as 1.2 V. 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. 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 SN74AVC8T245-Q1 design enables 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. One can use the output-enable (OE) input to disable the outputs so the buses are effectively isolated.
In the SN74AVC8T245-Q1 design, VCCA supplies the control pins (DIR and OE).
This device specification covers partial-power-down applications using Ioff. The Ioff circuitry disables the outputs when the device is powered down. This inhibits current backflow into the device which prevents damage to the device.
The VCC isolation feature allows both ports to be in the high-impedance state if either VCC input is at GND.
To put the device in the high-impedance state during power up or power down, tie OE to VCC through a pullup resistor; the current-sinking capability of the driver determines the minimum value of the resistor.
PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) |
---|---|---|
SN74AVC8T245-Q1 | RHL (VQFN, 24) | 5.5 mm × 3.5 mm |
PW (TSSOP, 24) | 7.8 mm × 6.4 mm |