Linear Technology LTC2871 RS232/RS485 Multiprotocol Transceiver with Integrated Termination DC1786A DC1786A Ficha De Dados
Códigos do produto
DC1786A
LTC2870/LTC2871
5
28701f
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
L
= 3.3V, TE485 = 0V, LB = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
R
TERM
Terminating Resistor
TE485 = V
L
, A – B = 2V, B = –7V, 0V, 10V
(Figure 8) (Note 5)
l
108
120
156
Ω
RS232 Driver
V
OLD
Output Low Voltage
R
L
= 3kΩ; V
EE
≤ –5.9V
l
–5
–5.7
–7.5
V
V
OHD
Output High Voltage
R
L
= 3kΩ; V
DD
≥ 6.5V
l
5
6.2
7.5
V
Three-State (High Impedance) Output Current
Y or Z (LTC2870) = ±15V
RS232 Receiver Enabled
DOUT1 or DOUT2 (LTC2871) = ±15V
RS232 Receiver Enabled
DOUT1 or DOUT2 (LTC2871) = ±15V
l
l
±156
±10
μA
μA
Output Short-Circuit Current
Driver Output = 0V
l
±35
±90
mA
RS232 Receiver
Input Threshold Voltage
l
0.6
1.5
2.5
V
Input Hysteresis
l
0.1
0.4
1.0
V
Output Low Voltage
I(RA, RB, ROUT1, ROUT2) = 1mA (Sinking)
1.7V ≤ V
1.7V ≤ V
L
≤ 5.5V
l
0.4
V
Output High Voltage
I(RA, RB, ROUT1, ROUT2) = –1mA (Sourcing)
1.7V ≤ V
1.7V ≤ V
L
≤ 5.5V
l
V
L
– 0.4
V
Input Resistance
–15V ≤ (A, B, RIN1, RIN2) ≤ 15V,
RS232 Receiver Enabled
RS232 Receiver Enabled
l
3
5
7
kΩ
Three-State (High Impedance) Output Current
0V ≤ (RA, RB, ROUT1, ROUT2) ≤ V
L
l
0
±5
μA
Output Short-Circuit Current
V
L
= 5.5V
0V ≤ (RA, RB, ROUT1, ROUT2) ≤ V
L
l
±25
±50
mA
Logic Inputs
Threshold Voltage
l
0.4
0.75 • V
L
V
Input Current
l
0
±5
μA
Power Supply Generator
V
DD
Regulated V
DD
Output Voltage
RS232 Drivers Enabled, Outputs Loaded with
R
R
L
= 3kΩ to GND, DIN1/DY = V
L
, DIN2/DZ = 0V
(Note 3)
7
V
V
EE
Regulated V
EE
Output Voltage
–6.3
V
ESD
LTC2870 Interface Pins (A, B, Y, Z)
Human Body Model to GND or V
CC
, Powered or
Unpowered (Note 7)
±26
kV
LTC2871 Interface Pins (A, B, Y, Z, RIN1, RIN2,
DOUT1, DOUT2)
DOUT1, DOUT2)
±16
kV
All Other Pins
Human Body Model (Note 7)
±4
kV