74ACT11286
9-BIT PARITY GENERATOR/CHECKER
WITH BUS DRIVER PARITY I/O PORTS

SCAS069B - AUGUST 1988 - REVISED APRIL 1996

Copyright © 1996, Texas Instruments Incorporated

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

• Inputs Are TTL-Voltage Compatible
• Generates Either Odd or Even Parity for Nine Data Lines
• Cascadable for n-Bits Parity
• Center-Pin V_CC and GND Configurations Minimize High-Speed Switching Noise
• EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic 300-mil DIPs (N)

EPIC is a trademark of Texas Instruments Incorporated.

description

The 74ACT11286 universal 9-bit parity generator/checker features a local output for parity checking and a bus-driving parity I/O port for parity generation/checking. The word-length capability is easily expanded by cascading.

The control input is implemented specifically to accommodate cascading. When the is low, the parity tree is disabled and the PARITY ERROR output remains at a high logic level, regardless of the input levels. When is high, the parity tree is enabled. PARITY ERROR indicates a parity error when either an even number of inputs (A through I) are high and PARITY I/O is forced to a low logic level, or when an odd number of inputs are high and PARITY I/O is forced to a high logic level.

The I/O control circuitry is designed so that the I/O port remains in the high-impedance state during power up or power down, to prevent bus glitches.

The 74ACT11286 is characterized for operation from -40°C to 85°C.