Datasheet
LTC2870/LTC2871
7
28701fb
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Typical perForMance characTerisTics
V
CC
Supply Current
vs RS232 Data Rate
V
CC
Supply Current vs Supply
Voltage, All Transceivers at Max
Rate (LTC2871)
RS485 Driver Differential Output
Voltage vs Temperature
RS485 Driver Propagation Delay
vs Temperature
RS485 Driver Skew
vs Temperature
RS485 Driver Short-Circuit
Current vs Short-Circuit Voltage
V
CC
Supply Current vs Supply
Voltage in Shutdown Mode
V
CC
Supply Current vs Supply
Voltage in Fast Enable Mode
V
CC
Supply Current
vs RS485 Data Rate
INPUT VOLTAGE (V)
3
INPUT CURRENET (µA)
30
25
20
15
10
5
0
4.5 53.5
28701 G01
5.54
H/F LOW
H/F HIGH
SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
5
4
3
2
1
4.5 53.5
28701 G02
5.54
–40°C
25°C
85°C
ALL DRIVERS AND RECEIVERS DISABLED
TE485 LOW
DATA RATE (Mbps)
0.1
SUPPLY CURRENT (mA)
100
80
60
40
20
0
10
28701 G03
1001
TE HIGH
TE LOW
V
CC
= 5V
V
CC
= 3.3V
ALL RS485 DRIVERS
AND RECEIVERS
SWITCHING.
CL = 100pF ON EACH
DRIVER OUTPUT.
DATA RATE (kbps)
0
INPUT CURRENT (mA)
35
30
25
15
20
10
5
400
28701 G04
500300200100
0.05nF
0.05nF
0.5nF
0.5nF
2.5nF
2.5nF
V
CC
= 5V
V
CC
= 3.3V
ALL RS232 DRIVERS
AND RECEIVERS
SWITCHING.
SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
120
110
100
90
80
70
4.5 53.5
28701 G05
5.54
85°C
ALL DRIVERS AND
RECEIVERS SWITCHING.
DRIVER OUTPUTS TIED TO
RECEIVER INPUTS.
RS232: 0.5Mbps (CL = 500pF)
RS485: 20Mbps (CL = 100pF)
TE485 HIGH
25°C
–40°C
TEMPERATURE (°C)
–50
VOLTAGE (V)
4.5
3.5
2.5
1.5
4.0
3.0
2.0
1.0
0.5
0
50 75–25
28701 G06
100250
R
L
= 100Ω
R
L
= 54Ω
R
L
= 100Ω
R
L
= 54Ω
V
CC
= 5V
V
CC
= 3.3V
TEMPERATURE (°C)
–50
DELAY (ns)
50
40
30
20
10
0
50 75–25
28701 G07
100250
V
CC
= 3.3V, V
L
= 1.7V
V
CC
= 5V, V
L
= 1.7V
V
CC
= 3.3V, V
L
= 3.3V
V
CC
= 5V, V
L
= 5V
TEMPERATURE (°C)
–50
SKEW (ns)
3.0
2.5
1.5
2.0
1.0
0.5
0
50 75–25
28701 G08
100250
OUTPUT LOW
OUTPUT HIGH
SHORT–CIRCUIT VOLTAGE (V)
–15
–10
–5
0
5
10
15
–150
–100
–50
0
50
100
150
SHORT–CIRCUIT CURRENT (mA)
28701 G09
V
CC
= 5V
V
CC
= 3.3V
T
A
= 25°C, V
CC
= V
L
= 3.3V, unless otherwise noted.
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