描述 Description

The ?ABTE16245 devices are 16-bit (dual-octal) noninverting 3-state transceivers designed for synchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. These devices can be used as two 8-bit transceivers or one 16-bit transceiver. They allow data transmission 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 device so that the buses are effectively isolated. When (OE)\\ is low, the device is active.
The B port has an equivalent 25- series output resistor to reduce ringing. Active bus-hold inputs also are on the B port to hold unused or floating inputs at a valid logic level.
The A port provides for the precharging of the outputs via VCCBIAS, which establishes a voltage between 1.3 V and 1.7 V when VCC is not connected.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

特性 Features

? Members of the Texas Instruments Widebus? Family
? Support the VME64 ETL Specification
? Reduced, TTL-Compatible, Input Threshold Range
? High-Drive Outputs (IOH = ?60 mA, IOL = 90 mA) Support 25- Incident-Wave Switching
? VCC BIAS Pin Minimizes Signal Distortion During Live Insertion
? Internal Pullup Resistor on (OE)\\ Keeps Outputs in High-Impedance State During Power Up or Power Down
? Distributed VCC and GND Pins Minimize High-Speed Switching Noise
? Equivalent 25- Series Damping Resistor on B Port
? Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
Widebus is a trademark of Texas Instruments.