Linear Technology LTC2871 RS232/RS485 Multiprotocol Transceiver with Integrated Termination DC1786A DC1786A Ficha De Dados
Códigos do produto
DC1786A
LTC2870/LTC2871
4
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
Power Supply
V
CC
Supply Voltage Operating Range
3
5.5
V
V
L
Logic Supply Voltage Operating Range
V
L
≤ V
CC
1.7
V
CC
V
V
CC
Supply Current in Shutdown Mode
RXEN = V
L
, DXEN = TE485 = FEN = 0V, (LTC2870)
DX485 = DX232 = TE485 = FEN = H/F = 0V,
RX485 = RX232 = V
L
(LTC2871)
l
8
60
μA
V
CC
Supply Current in Transceiver Mode
(Outputs Unloaded) (Note 3)
485/232 = DXEN = V
L
, RXEN = 0V,
DY/DZ = 0V or V
L
(LTC2870)
DX485 = DX232 = V
L
, RX485 = RX232 = 0V,
DI/DIN1/DIN2 = 0V or V
L
(LTC2871)
3.3
mA
V
L
Supply Current in Transceiver Mode
(Outputs Unloaded)
l
0
5
μA
RS485 Driver
|V
OD
|
Differential Output Voltage
R
L
= ∞, V
CC
= 3V (Figure 1)
R
L
= 27Ω, V
CC
= 3V (Figure 1)
R
L
= 50Ω, V
CC
= 3.13V (Figure 1)
l
l
l
1.5
1.5
1.5
2
6
V
CC
V
CC
V
V
V
V
V
Δ|V
OD
|
Difference in Magnitude of Differential Output
Voltage for Complementary Output States
Voltage for Complementary Output States
R
L
= 27Ω, V
CC
= 3V (Figure 1)
R
L
= 50Ω, V
CC
= 3.13V (Figure 1)
l
l
0.2
0.2
0.2
V
V
V
V
OC
Common Mode Output Voltage
R
L
= 27Ω or 50Ω (Figure 1)
l
3
V
Δ|V
OC
|
Difference in Magnitude of Common Mode
Output Voltage for Complementary Output
States
Output Voltage for Complementary Output
States
R
L
= 27Ω or 50Ω (Figure 1)
l
0.2
V
I
OZD485
Three-State (High Impedance) Output Current
V
OUT
= 12V or –7V, V
CC
= 0V or 3.3V (Figure 2)
l
–100
125
μA
I
OSD485
Maximum Short-Circuit Current
–7V ≤ V
OUT
≤ 12V (Figure 2)
l
–250
250
mA
RS485 Receiver
I
IN485
Input Current
V
IN
= 12V or –7V, V
CC
= 0V or 3.3V (Figure 3)
(Note 5)
l
–100
125
μA
R
IN485
Input Resistance
V
IN
= 12V or –7V, V
CC
= 0V or 3.3V (Figure 3)
(Note 5)
l
96
125
kΩ
Differential Input Signal Threshold Voltage
(A-B)
(A-B)
–7V ≤ (A or B) ≤ 12V (Note 5)
l
±200
mV
Input Hysteresis
B = 0V (Notes 3, 5)
130
mV
Differential Input Failsafe Threshold Voltage
–7V ≤ (A or B) ≤ 12V (Note 5)
l
–200
–50
0
mV
Input DC Failsafe Hysteresis
B = 0V (Note 5)
25
mV
V
OL
Output Low Voltage
Output Low, I(RA, RO) = 3mA (Sinking),
3V ≤ V
3V ≤ V
L
≤ 5.5V
l
0.4
V
Output Low, I(RA, RO) = 1mA (Sinking),
1.7V ≤ V
1.7V ≤ V
L
< 3V
l
0.4
V
V
OH
Output High Voltage
Output High, I(RA, RO) = –3mA (Sourcing),
3V ≤ V
3V ≤ V
L
≤ 5.5V
l
V
L
– 0.4
V
Output High, I(RA, RO) = –1mA (Sourcing),
1.7V ≤ V
1.7V ≤ V
L
< 3V
l
V
L
– 0.4
V
Three-State (High Impedance) Output Current
0V ≤ (RA, RO), ≤V
L
, V
L
= 5.5V
l
0
±5
μA
Short-Circuit Output Current
0V ≤ (RA, RO), ≤V
L
, V
L
= 5.5V
l
±125
mA