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參數資料
| 型號： | MM54240N |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Asynchronous Receiver/Transmitter Remote Controller |
| 中文描述： | 異步接收器/發射器遙控器 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 187K |
| 代理商： | MM54240N |
TL/F/10819
M
April 1990
MM54240
Asynchronous Receiver/Transmitter Remote Controller
General Description
The MM54240 is a monolithic MOS integrated circuit utiliz-
ing N-channel low-threshold, enhancement mode and ion-
implanted depletion mode devices. The circuit is designed
for processor-type remote control applications. The data
transmission consists of a pulse width modulated serial data
stream of 18 bits. This stream consists of 7 address bits, 1
command bit, 8 data bits, 1 parity bit and 1 dummy bit in that
order.
The MM54240 can be operated in two modes; namely
‘‘master’’ and ‘‘slave’’. The master interfaces to a processor
bus, and is capable of polling and controlling 128 slave cir-
cuits. The slave circuits are interfaced to remote data sourc-
es and/or data destinations.
Applications
The MM54240 finds application in transmitting data to and
receiving data from remote A-D/D-A, remote microproces-
sor units, remote digital transducer or remote data peripher-
al devices.
Features
Y
Supply voltage rangeD4.75V to 11.5V single supply
Y
Low quiescent currentD5.0 mA maximum
Y
On-chip oscillator based on inexpensive R-C
components
Y
Pulse width modulation techniques minimize error and
maximize frequency tolerance
Y
Mode input for either master or slave operations
Y
Chip select (CS) input in the master mode
Y
Selectable output port options in the slave mode
Y
Transmit/receive control output (CS) in the slave mode
Functional Block Diagram
TL/F/10819–1
Order Number MM54240N
See NS Package Number N24C
Pin
Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
V
SS
D7 (MSB)
D6
D5
D4
D3
D2
D1
D0 (LSB)
Serial
Mode
CS
V
DD
R/C1
W/C2
S
OSC
A6 (MSB)
A5
A4
A3
A2
A1
A0 (LSB)
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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