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PDF UPB8228 Data sheet ( Hoja de datos )
| Número de pieza | UPB8228 | |
| Descripción | 8080A SYSTEM CONTROLLER AND BUS DRIVER | |
| Fabricantes | NEC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UPB8228 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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NEe Microcomputers, Inc.
fttIEC
Jl,PB8228
J.I PB8238
8080A SYSTEM CONTROLLER
AND BUS DRIVER
OESCR IPTION
The pPB8228/8238 is a single chip cOntroller and bus driver for 8080A based
systems. All the required interface signals rrecessary to connect RAM, ROM and
I/O components to a pPD8080A are generated.
The pPB8228/8238 provides a bi·directional three·state bus driver for high TTL
fan-out and isolation of the processor data bus from the system data bus for
increased noise immunity.
The system controller portion of the pPB8228/8238 consists of a status latch for
definition of processor machine cycles and a gating array to decode this information
for direct interface to system components. The controller can enable gating of a
multi·byte interrupt onto the data bus or can automatically insert a RESTART 7 Onto
the data bus without any additional components.
Two devices are provided:. the pPB8228 for small systems without tight write timing
constraints and the pPB8238 for larger systems.
FEATU RES
• System Controller for 8080A Systems
• Bi-Directional Data Bus for Processor Isolation
• 3.60V Output High Voltage for Direct Interface to 8080A Processor
•• Three State Outputs on System Data Bus
• Enables Use of Multi-Byte Interrupt Instructions
• Generates RST 7 Interrupt Instruction
• pPB8228 for Small Memory Systems
• pPB8238 for Large Memory Systems
• Reduces System Package Count
• Schottky Bipolar Technology
PIN CONFIGURATION
STSTB
HLDA
WR
DBIN
DB4
D4
DB7
D7
DB3
D3
DB2
D2
DBa
GND
NC: No Connection
Vee
I/OW
MEMW
I/OR
MEMR
INTA
BUSEN
DS
DBS
D5
DB5
D,
DB,
DO
PIN NAMES
07 - Do
DB7 DB
liaR
IIOW
MEMR
MEMW
DBIN
I'ITA
HLDA
WR
BUSEN
STSTB
Vec
GND
Data Bus (Processor Side)
Data Bus (System Si<!~
I/O Read
1/0 Write
Memory Read
Memory Write
OBI N (From ProcttliSOri
Interrupt Al:.knowledge
HLDA (From Processor)
WR (From Processorl
Bus Enabte Input
Status Strobe (From J.'PB8224)
+5V
OVohs
II
Rev/l
571
1 page  
STATUS WORD CHART
Jl. P88228/8238
CD000®®0®®@
DO INTA
0000000101
110 10 10 111
02 STACK 0 0 0 1 1 0 0 0 0 0
o0 0 0 0 0 0 o1
o0 0 0 0 0 1 o0 o
06 INP
07 MEMR
1 0 000 0 0 1 0
001 0 0 0 I 0 a 0
1 1Ia 1 a a a o 1
a
o
24 MEMR o o 1 0 1 1 1 1 1
26 MEMW
a10 1111
25 I/OR
1 1 1a1 1 1
27 I/OW
1 111a11
23 INTA
1 11 1 100
PIN\.
NO\
\
SIGNAL STATUS
IlP88228/8238 CONTROL SIGNALS
IlP0 8080A
OUTPUT
IlPB8228/8238
OUTPUT
II
575
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet UPB8228.PDF ] | |
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