MAX3140 Maxim, MAX3140 Datasheet - Page 8

• Manufacturer Part Number: MAX3140
• Description: SPI/MICROWIRE-Compatible UART with Integrated True Fail-Safe RS-485/RS-422 Transceivers
• Manufacturer: Maxim

SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
(V
8
CC
1000
600
500
400
300
200
100
700
900
800
700
600
500
400
300
200
100
60
50
40
30
20
10
_______________________________________________________________________________________
0
0
0
= +5V, T
-40
0
0
vs. RECEIVER OUTPUT LOW VOLTAGE
1.8432MHz CRYSTAL
TRANSMITTING AT 115.2 kbps
-20
EXTERNAL CLOCK FREQUENCY
EXTERNAL CLOCK FREQUENCY (MHz)
UART SUPPLY CURRENT vs.
RS-485 OUTPUT CURRENT
1
A
1
UART SUPPLY CURRENT
OUTPUT LOW VOLTAGE (V)
= +25°C, unless otherwise noted.)
vs. TEMPERATURE
0
TEMPERATURE (°C)
2
2
20
40
3
3
60
4
4
80
100
5
5
10
80
70
60
50
40
30
20
10
30
25
20
15
10
90
9
7
5
3
1
8
6
4
2
0
5
0
0
-40
0
0
vs. RECEIVER OUTPUT HIGH VOLTAGE
TX, RTS, DOUT OUTPUT CURRENT
0.1
-20
UART SHUTDOWN CURRENT
RS-485 OUTPUT CURRENT
vs. OUTPUT LOW VOLTAGE
0.2
1
OUTPUT HIGH VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
vs. TEMPERATURE
0
0.3
TEMPERATURE (°C)
0.4
2
20
1.8432MHz CRYSTAL
0.5
40
Typical Operating Characteristics
0.6 0.7 0.8
3
RTS
60
DOUT
4
TX
80
0.9
100
1.0
5
525
500
475
450
425
400
375
350
325
300
400
350
300
250
150
100
200
20
18
16
14
12
10
50
8
6
4
2
0
-60
100
-60
SUPPLY CURRENT vs. TEMPERATURE
A: SRL = GND
1.8432 MHz
RS-485 TRANSCEIVER SHUTDOWN
CRYSTAL
RS-485 TRANSCEIVER NO-LOAD
A
B
A
B
-40 -20
-40 -20
CURRENT vs. TEMPERATURE
UART SUPPLY CURRENT
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
vs. BAUD RATE
BAUD RATE (bps)
0
0
TRANSMITTING
20
10k
20
B: SRL = OPEN OR V
40
40
100k
DE = GND
60
60
DE = V
STANDBY
80
80
CC
CC
100
100
1M