FEATURES
· Member of the Texas Instruments Widebus™
Family
· DOC™ Circuitry Dynamically Changes Output
Impedance, Resulting in Noise Reduction
Without Speed Degradation
· Dynamic Drive Capability Is Equivalent to
Standard Outputs With IOH and IOL of ±24 mA
at 2.5-V VCC
· Control Inputs VIH/VIL Levels Are Referenced
to VCCB Voltage
· If Either VCC Input Is at GND, Both Ports Are in
the High-Impedance State
· Overvoltage-Tolerant Inputs/Outputs Allow
Mixed-Voltage-Mode Data Communications
· Ioff Supports Partial-Power-Down Mode
Operation
· Fully Configurable Dual-Rail Design Allows
Each Port to Operate Over Full 1.4-V to 3.6-V
Power-Supply Range
· Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
· ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)

DESCRIPTION
This 16-bit (dual-octal) noninverting bus transceiver uses two separate configurable power-supply rails. The
A port is designed to track VCCA. VCCA accepts any supply voltage from 1.4 V to 3.6 V. The B port is designed to
track VCCB. VCCB accepts any supply voltage from 1.4 V to 3.6 V. This allows for universal low-voltage
bidirectional translation between any of the 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVCB164245 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 SN74AVCB164245 is designed so that the control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by VCCB.
To ensure the high-impedance state during power up or power down, OE should be tied to VCCB through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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. If either VCC input is at GND,
both ports are in the high-impedance state.