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參數(shù)資料
| 型號： | DP8238 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 137K |
| 代理商： | DP8238 |
TL/F/6825
D
December 1988
DP8228/DP8228M/DP8238/DP8238M
System Controller and Bus Driver
General Description
The DP8228/DP8228M, DP8238/DP8238M are system
controller/bus 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 input/output 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
user-selected
single-level
(RST 7)
Y
Provides
interrupt
vector
Y
Provides isolation of data bus
Y
Supports a wide variety of system bus structures
Y
Reduces system component count
Y
DP8238/DP8238M
Write and Memory Write control signals for large sys-
tem timing control
provides
advanced
Input/Output
8080A Microcomputer Family Block Diagram
TL/F/6825–1
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
相關PDF資料 |
PDF描述 |
|---|---|
| DP8238M | |
| DP8300 | Single 8-bit Bus Transceiver |
| DP8303A | Single 8-Bit Inverting Bus Transceiver |
| DP8303AJ | Single 8-Bit Inverting Bus Transceiver |
| DP8303J | Single 8-Bit Inverting Bus Transceiver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DP8238J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:System Controller and Bus Driver |
| DP8238J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:System Controller |
| DP8238M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| DP8238MJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:System Controller and Bus Driver |
| DP8238MJ/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:System Controller |
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