LTC2872
Typical perForMance characTerisTics
VCC Supply Current vs Supply
Voltage in Shutdown Mode
VCC Supply Current vs Supply
Voltage in Fast Enable Mode
VCC Supply Current
vs RS485 Data Rate
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
200
180
160
140
120
100
80
30
25
20
15
10
5
V
CC
V
CC
= 5V
= 3.3V
ALL RS485 DRIVERS AND
RECEIVERS SWITCHING.
Y TIED TO A; Z TIED TO B,
H/F = 0V, C = 100pF
L
H/F HIGH
H/F LOW
ON Y AND Z TO GND
85°C
25°C
DRIVER AND RECEIVER
TERMINATION ENABLED
60
–40°C
40
TERMINATION DISABLED
20
0
0
3
3.5
4
4.5
5
5.5
0.1
1
10
100
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
DATA RATE (Mbps)
INPUT VOLTAGE (V)
2872 G02
2872 G03
2872 G01
VCC Supply Current
vs Supply Voltage for RS485
at Maximum Data Rate
VCC Supply Current
vs RS232 Data Rate
RS485 Driver Differential Output
Voltage vs Temperature
240
220
200
180
160
140
120
100
80
50
45
40
35
30
25
20
15
10
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
V
= 5V
BOTH RS485 DRIVERS AND
RECEIVERS SWITCHING.
Y TIED TO A, Z TIED TO B
H/F = 0V
ALL RS232 DRIVERS
AND RECEIVERS
SWITCHING
CC
CC
R
= 100Ω
L
= 3.3V
R
= 54Ω
DRIVER AND RECEIVER
TERMINATION ENABLED
L
2.5nF
0.5nF
20Mbps, C = 100pF ON
R
= 100Ω
= 54Ω
L
L
Y AND Z TO GND
R
L
0.05nF
0.5nF
2.5nF
85°C
25°C
–40°C
0.05nF
V
CC
V
CC
= 5V
= 3.3V
3
3.5
4
4.5
5
5.5
0
50 100 150 200 250 300 350 400 450 500
–50
–25
0
25
50
75
100
SUPPLY VOLTAGE (V)
DATA RATE (kbps)
TEMPERATURE (°C)
2872 G05
2872 G04
2872 G06
RS485 Driver Propagation Delay
vs Temperature
RS485 Driver Short-Circuit Current
vs Short-Circuit Voltage
RS485 Driver and Receiver Skew
vs Temperature
50
40
30
20
10
0
150
100
50
3.0
2.5
2.0
1.5
1.0
0.5
0
V
CC
V
CC
= 5V
= 3.3V
V
V
V
V
= 3.3V, V = 1.7V
L
CC
CC
CC
CC
= 5V, V = 1.7V
L
= 3.3V, V = 3.3V
L
= 5V, V = 5V
L
OUTPUT LOW
DRIVER
0
–50
–100
–150
RECEIVER
OUTPUT HIGH
10
–50
–25
0
25
50
75
100
–10
–5
0
5
15
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
SHORT-CIRCUIT VOLTAGE (V)
TEMPERATURE (°C)
2872 G07
2872 G08
2872 G09
2872f
6
Linear Systems [ Linear Systems ]
