74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS

SCAS527A - AUGUST 1995 - NOVEMBER 1995

features

• Member of the Texas Instruments Widebus^TM Family
• Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17
• Bus-Hold Inputs Eliminate the Need for External Pullup Resistors
• Typical V_OLP (Output Ground Bounce) < 0.8 V at V_CC = 5 V, T_A = 25°C
• Distributed V_CC and GND Pin Configuration Minimizes High-Speed Switching Noise
• Packaged in Plastic Thin Shrink Small-Outline (DGG) Package

  Widebus is a trademark of Texas Instruments Incorporated.

description

The 74ACT16254 is a dual 16-bit, noninverting bus-interface device. The A and C ports perform a transceiver function, like that of the 74ACT245. The B and C ports perform the buffer/driver function of the 74ACT244. The A and C port outputs are designed to sink up to 12 mA.

The 74ACT16254 is designed for asynchronous communication between data buses. The control function implementation minimizes externaltiming requirements.

Data transmission from the A port to the C port, C port to A port, or B port to C port is accomplished by setting the appropriate logic levels on the bus enable (EN1 and EN2) inputs.

All outputs are disabled when logic highs are placed on both EN1 and EN2; the buses are effectively isolated.

The 74ACT16254 is packaged in TI's thin shrink small-outline package (DGG), which provides twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

Active bus-hold circuitry is provided to hold unused or floating data and I/O pins at a valid logic level.

The 74ACT16254 is characterized for operation from -40°C to 85°C.