LTC485I LINER [Linear Technology], LTC485I Datasheet - Page 5

• Manufacturer Part Number: LTC485I
• Description: Low Power RS485 Interface Transceiver
• Manufacturer: LINER [Linear Technology]

FU CTIO TABLES
LTC485 Transmitting
LTC485 Receiving
TYPICAL PERFOR
36
32
28
24
20
16
12
RE
8
X
X
X
X
0
U
4
RE
0
Receiver Output Low Voltage
vs Output Current
0
0
0
1
T
A
= 25°C
INPUTS
0.5
DE
1
1
0
1
OUTPUT VOLTAGE (V)
U
INPUTS
1.0
DE
0
0
0
0
DI
1
0
X
X
1.5
W
LTC485 • TPC01
CONDITION
Inputs Open
No Fault
No Fault
2.0
Fault
A
LINE
A – B
– 0.2V
X
0.2V
X
U
CE
C
HARA TERISTICS
–12
–10
–18
–16
–14
–8
– 6
–4
–2
B
0
1
Z
Z
0
OUTPUTS
OUTPUTS
5
Receiver Output High Voltage
vs Output Current
T
A
R
1
0
1
Z
= 25°C
C
A
1
0
Z
Z
OUTPUT VOLTAGE (V)
4
PI FU CTIO S
PIN #
U
1
2
3
4
5
6
7
8
3
LTC485 • TPC02
NAME
U
GND
V
RO
RE
DE
DI
A
B
CC
2
DESCRIPTION
Receiver Output. If the receiver output is enabled
(RE low), then if A > B by 200mV, RO will be
high. If A < B by 200mV, then RO will be low.
Receiver Output Enable. A low enables the
receiver output, RO. A high input forces the
receiver output into a high impedance state.
Driver Outputs Enable. A high on DE enables the
driver output. A and B, and the chip will function
as a line driver. A low input will force the driver
outputs into a high impedance state and the chip
will function as a line receiver.
Driver Input. If the driver outputs are enabled
(DE high), then a low on DI forces the outputs A
low and B high. A high on DI with the driver
outputs enabled will force A high and B low.
Ground Connection.
Driver Output/Receiver Input.
Driver Output/Receiver Input.
Positive Supply; 4.75 < V
U
4.8
4.6
4.4
4.2
4.0
3.8
3.4
3.6
3.2
3.0
–50
Receiver Output High Voltage
vs Temperature
I = 8mA
–25
0
TEMPERATURE (°C)
25
CC
< 5.25
50
LTC485
75
LTC485 • TPC03
100
5
125