DP8228 Datasheet | National Semiconductor

Description The DP8228 DP8228M DP8238 DP8238M are system controller bus drivers contained in a standard 28-pin dualin-line package The chip which is fabricated using Schottky Bipolar technology generates all the read and write control signals required to directly interface the memory and input output ponents of the 8080A microputer family The chip also provides drive and isolation for the bidirectional data bus of the 8080A microprocessor Data bus isolation enables the use of slower memory and input output ponents in a system and provides for enhanced system noise immunity A user-selected signal-level interrupt vector (RST 7) is provided by the device for use in the interrupt structure of small systems that need only one basic vector No additional ponents (such as an interrupt instruction port) are required to use the single interrupt vector in these systems The devices also generate an Interrupt Acknowledge (INTA) control signal for each byte of a multibyte CALL instruction when an interrupt is acknowledged by the 8080A This feature permits the use of a multilevel priority interrupt structure in large interrupt-driven systems Features Single chip system controller and bus driver for 8080A Microputer Systems Allows use of multibyte CALL instructions for Interrupt Acknowledge Provides user-selected single-level interrupt vector (RST 7) Provides isolation of data bus Supports a wide variety of system bus structures Reduces system ponent count DP8238 DP8238M provides advanced Input Output Write and Memory Write control signals for large system timing control 8080A Microputer Family Block Diagram TL F 6825 - 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 6825 RRD-B30M105 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications...