LTC1480 Linear Technology, LTC1480 Datasheet - Page 4

• Manufacturer Part Number: LTC1480
• Description: 3.3V Ultra-Low Power RS485 Transceiver
• Manufacturer: Linear Technology

PIN
LTC1480
RO (Pin 1): Receiver Output. If the receiver output is
enabled (RE LOW) and A > B by 200mV, then 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. If RE is low and DE is
4
TYPICAL PERFORMANCE CHARACTERISTICS
3.0
7.0
5.5
5.0
4.5
4.0
6.5
6.0
3.5
U
12
10
8
6
4
2
0
– 40
–40
Driver Skew vs Temperature
Receiver t
vs Temperature
FUNCTIONS
V
V
CC
– 20
–20
CC
= 3.3V
= 3.3V
U
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
PLH
20
20
– t
U
PHL
40
40
60
60
W
LT1480 • TPC04
LT1480 • TPC07
80
80
U
100
100
25
20
15
10
0.6
0.5
0.4
0.3
0.2
0.1
5
0
0
0
–40
Receiver Output Low Voltage
vs Output Current
Receiver Output Low Voltage
vs Temperature
0.2 0.4 0.6
V
T
A
CC
V
1 = 8mA
–20
= 25 C
CC
= 3.3V
= 3.3V
OUTPUT VOLTAGE (V)
0
TEMPERATURE ( C)
0.8
20
1.0
high, the driver outputs will be fed back to the receiver and
the receive output will correspond to the driver input.
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
CC
40
1.2
(Pin 8): Positive Supply. 3.0V < V
1.4
60
1.6
LTC1480 • TPC05
LTC1480 • TPC08
80
1.8
2.0
100
– 16
– 14
– 12
– 10
– 8
– 6
– 4
–2
2.6
2.0
3.0
2.8
2.4
2.2
0
3.30
– 40
Receiver Output High Voltage
vs Output Current
Receiver Output High Voltage
vs Temperature
V
T
3.05
V
1 = 8mA
A
CC
– 20
CC
= 25 C
= 3.3V
= 3.3V
2.80
OUTPUT VOLTAGE (V)
0
TEMPERATURE ( C)
2.55
CC
20
2.30
< 3.6V.
40
2.05
1.80
60
LT1480 • TPC06
LTC1480 • TPC09
1.55
80
1.30
100