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MM54240 Datasheet

  • MM54240

  • Asynchronous Receiver/Transmitter Remote Controller

  • 10頁

  • NSC

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MM54240 Asynchronous Receiver Transmitter Remote Controller
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
鈥樷€榤aster鈥欌€?and 鈥樷€榮lave鈥欌€?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
sor units remote digital transducer or remote data peripher-
al devices
Features
Y
Y
Y
Y
Y
Y
Y
Y
Supply voltage range 4 75V to 11 5V single supply
Low quiescent current 5 0 mA maximum
On-chip oscillator based on inexpensive R-C
components
Pulse width modulation techniques minimize error and
maximize frequency tolerance
Mode input for either master or slave operations
Chip select (CS) input in the master mode
Selectable output port options in the slave mode
Transmit receive control output (CS) in the slave mode
Applications
The MM54240 finds application in transmitting data to and
receiving data from remote A-D D-A remote microproces-
Functional Block Diagram
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Configuration
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)
TL F 10819 鈥?1
Order Number MM54240N
See NS Package Number N24C
C
1995 National Semiconductor Corporation
TL F 10819
RRD-B30M105 Printed in U S A

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