SN74ALVCHR162282
18-BIT TO 36-BIT REGISTERED BUS EXCHANGER
WITH 3-STATE OUTPUTS

SCES087 - SEPTEMBER 1996

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

features

• EPIC^TM (Enhanced-Performance Implanted CMOS) Sub-Micron Process
• Output Ports Have Equivalent 26- Series Resistors, So No External Resistors Are Required
• Member of the Texas Instruments Widebus^TM Family
• Bus-Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
• Packaged in Thin Shrink Small-Outline Package

EPIC and Widebus are trademarks of Texas Instruments Incorporated.

description

The SN74ALVCHR162282 is an 18-bit to 36-bit registered bus exchanger designed for 2.3-V to 3.6-V V_CC operation. This part is intended for use in applications where data must be transferred from a narrow high-speed bus to a wide lower-frequency bus. It is designed specifically for low-voltage (3.3-V) V_CC operation.

The device provides synchronous data exchange between the two ports. Data is stored in the internal registers on the low-to-high transition of the CLK input. For data transfer in the B-to-A direction, selects 1B or 2B data for the A outputs.

For data transfer in the A-to-B direction, a two-stage pipeline is provided in the 1B path, with a single storage register in the 2B path. Data flow is controlled by the active-low output enable () \and the DIR input. The DIR control pin is registered to synchronize the bus direction changes with the clock.

The outputs, which are designed to sink up to 12mA, include 26- resistors to reduce overshoot and undershoot.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN74ALVCHR162282 is characterized for operation from -40°C to 85°C.