LT1483 Linear Technology, LT1483 Datasheet - Page 4

• Manufacturer Part Number: LT1483
• Description: Ultra-Low Power RS485 Low EMI Transceiver with Shutdown
• Manufacturer: Linear Technology

PIN
FU CTIO TABLES
LTC1483
TYPICAL PERFORMANCE CHARACTERISTICS
RO (Pin 1): 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.
RE (Pin 2): Receiver Output Enable. A low enables the
receiver output, RO. A high input forces the receiver
output into a high impedance state.
DE (Pin 3): Driver Outputs Enable. A high on DE enables
the driver output. A, 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. If RE is high and DE is low, the part will enter a low
power (1 A) shutdown state.
4
LTC1483 Transmitting
*Shutdown mode for LTC1483
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
U
RE
X
X
0
1
U
–50
Driver Differential Output Voltage
vs Temperature
FUNCTIONS
–25
INPUTS
U
DE
1
1
0
0
0
TEMPERATURE ( C)
U
25
50
DI
U
1
0
X
X
75
R
W
L
= 54
100
B
0
1
Z
Z*
OUTPUTS
1483 G04
125
U
A
1
0
Z
Z*
70
60
50
40
30
20
10
0
Driver Output Low Voltage
vs Output Current
0
T
A
= 25 C
1
OUTPUT VOLTAGE
2
DI (Pin 4): 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.
GND (Pin 5): Ground.
A (Pin 6): Driver Output/Receiver Input.
B (Pin 7): Driver Output/Receiver Input.
V
LTC1483 Receiving
*Shutdown mode for LTC1483
CC
RE
0
0
0
1
(Pin 8): Positive Supply. 4.75V < V
3
INPUTS
1483 G05
DE
0
0
0
0
4
Inputs Open
A – B
– 0.2V
0.2V
X
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
0
Driver Output High Voltage
vs Output Current
T
A
= 25 C
OUTPUTS
1
OUTPUT VOLTAGE (V)
RO
1
0
1
Z*
2
CC
< 5.25V.
3
4
1483 G06
5