LTC1481 Linear Technology, LTC1481 Datasheet - Page 4

• Manufacturer Part Number: LTC1481
• Description: Ultra-Low Power RS485 Transceiver with Shutdown
• Manufacturer: Linear Technology

FU CTIO TABLES
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.
LTC1481
PIN
LTC1481 Transmitting
*Shutdown mode for LTC1481
4
TYPICAL PERFORMANCE CHARACTERISTICS
–10
–20
–30
–40
–50
–60
–70
–80
–90
RE
U
0
X
X
U
0
1
0
Driver Output High Voltage
vs Output Current
FUNCTIONS
T
A
= 25°C
INPUTS
U
1
DE
1
1
0
0
OUTPUT VOLTAGE (V)
U
2
DI
U
X
X
1
0
3
W
4
B
0
1
Z
Z*
1481 G04
OUTPUTS
U
5
A
1
0
Z
Z*
14
12
10
8
6
4
2
0
–50
Receiver t
Temperature
–25
0
TEMPERATURE (°C)
PLH
25
– t
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
LTC1481 Receiving
*Shutdown mode for LTC1481
PHL
50
CC
RE
0
0
0
1
(Pin 8): Positive Supply. 4.75V < V
75
vs
100
INPUTS
1481 G05
DE
0
0
0
0
125
Inputs Open
A – B
– 0.2V
0.2V
X
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
Driver Skew vs Temperature
–25
OUTPUTS
0
RO
TEMPERATURE (°C)
Z*
1
0
1
25
CC
50
< 5.25V.
75
100
1481 G05
125