74ABTH16899

INTEGRATED CIRCUITS www.DataSheet4U.net 74ABT16899 74ABTH16899 18-bit latched transceiver with 16-bit parity generator/checker (3-State) Product specification Supersedes data of 1997 Mar 28 IC23 Data Handbook 1998 Feb 25 Philips Semiconductors Philips Semiconductors Product specification 18-bit latched transceiver with 16-bit parity generator/checker (3-State) 74ABT16899 74ABTH16899 FEATURES Symmetrical (A and B bus functions are identical) Selectable generate parity or ”feed-through” parity for A-to-B and B-to-A directions Parity error checking of the A and B bus latches is continuously provided with ERRA and ERRB, even with both buses in 3-State. The 74ABT/H16899 features independent latch enables for the A and B bus latches, a select pin for ODD/EVEN parity, and separate error signal output pins for checking parity. Independent transparent latches for A-to-B and B-to-A directions Selectable ODD/EVEN parity Continuously checks parity of both A bus and B bus latches as ERRA and ERRB FUNCTIONAL DESCRIPTION The 74ABT/H16899 has three principal modes of operation which are outlined below. All modes apply to both the A-to-B and B-to-A directions. Transparent latch, Generate parity, Check A and B bus parity: Bus A (B) communicates to Bus B (A), parity is generated and passed on to the B (A) Bus as BPAR (APAR). If LEA and LEB are High and the Mode Select (SEL) is Low, the parity generated from A0-A7 and B0-B7 can be checked and monitored by ERRA and ERRB. (Fa...