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DP8228 Datasheet(PDF) 2 Page - Texas Instruments |
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DP8228 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 8 page TLF6825 December 1988 DP8228DP8228MDP8238DP8238M System Controller and Bus Driver General Description The DP8228DP8228M DP8238DP8238M are system controllerbus drivers contained in a standard 28-pin dual- in-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 components of the 8080A microcomputer 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 inputoutput compo- nents in a system and provides for enhanced system noise immunity A user-selected signal-level interrupt vector (RST 7) is pro- vided by the device for use in the interrupt structure of small systems that need only one basic vector No additional components (such as an interrupt instruction port) are re- quired 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 fea- ture permits the use of a multilevel priority interrupt structure in large interrupt-driven systems Features Y Single chip system controller and bus driver for 8080A Microcomputer Systems Y Allows use of multibyte CALL instructions for Interrupt Acknowledge Y Provides user-selected single-level interrupt vector (RST 7) Y Provides isolation of data bus Y Supports a wide variety of system bus structures Y Reduces system component count Y DP8238DP8238M provides advanced InputOutput Write and Memory Write control signals for large sys- tem timing control 8080A Microcomputer Family Block Diagram TLF6825 – 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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