Datasheet

LTC2872
7
2872f
Typical perForMance characTerisTics
RS485 Termination Resistance
vs Temperature RS232 Operation at 500kbps
RS485 Operation at 20Mbps
RS485 Receiver Output Voltage
vs Load Current
RS232 Receiver Input Threshold
vs Temperature
RS232 Receiver Output Voltage
vs Load Current
RS232 Driver Outputs Enabling
and Disabling V
DD
and V
EE
Powering Up
RS485 Receiver Propagation
Delay vs Temperature
TEMPERATURE (°C)
–50
DELAY (ns)
80
70
60
50
40
50 75–25
2872 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
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
6
5
4
2
3
1
0
82
2872 G11
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
2872 G12
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
2872 G13
1064
V
L
= 5V
V
L
= 3.3V
V
L
= 1.7V
TEMPERATURE (°C)
–50
RESISTANCE (Ω)
130
118
116
114
112
110
128
126
124
122
120
50 75–25
2872 G14
100250
V
CM
= –7V
V
CM
= 2V
V
CM
= 12V
1µs/DIV
WRAPPING DATA
DOUT LOADS: 5kΩ + 50pF
5V/DIV
2872 G15
DY
DZ
RA
RB
Z
Y
20ns/DIV
H/F HIGH
Y, Z LOADS: 120Ω (DIFF) + 50pF
1V/DIV
5V/DIV
5V/DIV
2872 G16
DY
RA
Z
Y
40ns/DIV
5V/DIV
2872 G17
DXEN
FEN = VL
FEN = 0V
Z
Y
Z
Y
100µs/DIV
5V/DIV
2V/DIV
2872 G18
FEN
V
DD
V
EE
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