Datasheet

LTC2870/LTC2871
8
28701f
TYPICAL PERFORMANCE CHARACTERISTICS
RS232 Receiver Input Threshold
vs Temperature
RS232 Receiver Output Voltage
vs Load Current
RS485 Termination Resistance
vs Temperature
RS232 Operation at 500kbps RS485 Operation at 20Mbps LTC2870 Drivers Changing Modes
RS485 Receiver Propagation
Delay vs Temperature
RS485 Receiver Skew
vs Temperature
RS485 Receiver Output Voltage
vs Load Current
TEMPERATURE (°C)
–50
DELAY (ns)
80
70
60
50
40
50 75–25
28701 G10
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
2.0
1.0
1.5
0.5
0
50 75–25
28701 G11
100250
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
6
5
4
2
3
1
0
82
28701 G12
1064
V
L
= 5V
V
L
= 3.3V
V
L
= 1.7V
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
50 75–25
28701 G13
100250
V
CC
= 5V
V
CC
= 3.3V
INPUT HIGH
INPUT LOW
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
6
5
4
2
3
1
0
82
28701 G14
1064
V
L
= 5V
V
L
= 3.3V
V
L
= 1.7V
TEMPERATURE (°C)
–50
RESISTANCE ()
130
118
116
114
112
110
128
126
124
122
120
50 75–25
28701 G15
100250
V
CM
= –7V
V
CM
= 2V
V
CM
= 12V
WRAPPING DATA
DOUT LOADS: 5kΩ + 50pF
5V/DIV
28701 G16
1µs/DIV
DOUT1
DOUT2
ROUT1
ROUT2
DIN1
DIN2
H/F HIGH
Y, Z LOADS: 120Ω (DIFF) + 50pF
1V/DIV
5V/DIV
28701 G17
20ns/DIV
RO
Y
DI
Z
5V/DIV
5V/DIV
28701 G18
2µs/DIV
RS232
MODE
RS485
MODE
RS232
MODE
Y
485/232
Z
T
A
= 25°C, V
CC
= V
L
= 3.3V, unless otherwise noted.