LTC2872
elecTrical characTerisTics
SYMBOL
V
CC
V
L
PARAMETER
Supply Voltage Operating Range
Logic Supply Voltage Operating Range
V
CC
Supply Current in Shutdown Mode
V
CC
Supply Current in RS485 Transceiver Mode
(Outputs Unloaded) (Note 3)
V
CC
Supply Current in RS232 Transceiver Mode
(Outputs Unloaded) (Note 3)
V
L
≤ V
CC
RXEN1
=
RXEN2
= V
L
,
DXEN1 = DXEN2 = FEN = H/F = 0V
485/232_1 = 485/232_2 = DXEN1 =
DXEN2 = V
L
,
RXEN1
=
RXEN2
= 0V
DXEN1 = DXEN2 = V
L
; 485/232_1 =
485/232_2 =
RXEN1
=
RXEN2
= 0V
Power Supply
l
l
l
l
l
l
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_1 = TE485_2 = 0V, LB = 0V unless otherwise noted.
CONDITIONS
MIN
3
1.7
8
4.5
5.5
0
TYP
MAX
5.5
V
CC
60
7
8
5
UNITS
V
V
µA
mA
mA
µA
V
L
Supply Current in RS485 or RS232 Transceive DXEN1 = DXEN2 = V
L
,
RXEN1
=
RXEN2
= 0V
Mode (Outputs Unloaded)
RS485 Drivers
|V
OD
|
Differential Output Voltage
R
L
= ∞, V
CC
= 3V (Figure 1)
R
L
= 27Ω, V
CC
= 4.5V (Figure 1)
R
L
= 27Ω, V
CC
= 3V (Figure 1)
R
L
= 50Ω, V
CC
= 3.13V (Figure 1)
R
L
= 27Ω, V
CC
= 3V (Figure 1)
R
L
= 50Ω, V
CC
= 3.13V (Figure 1)
R
L
= 27Ω or 50Ω (Figure 1)
l
l
l
l
l
l
l
l
l
l
2.1
1.5
2
6
V
CC
V
CC
V
CC
0.2
0.2
3
0.2
V
V
V
V
V
V
V
V
µA
mA
µA
kΩ
∆|V
OD
|
V
OC
∆|V
OC
|
I
OZD485
I
OSD485
I
IN485
R
IN485
Difference in Magnitude of Differential Output
Voltage for Complementary Output States
Common Mode Output Voltage
Difference in Magnitude of Common Mode
R
L
= 27Ω or 50Ω (Figure 1)
Output Voltage for Complementary Output States
Three-State (High Impedance) Output Current
Maximum Short-Circuit Current
Input Current
Input Resistance
Differential Input Signal Threshold Voltage (A–B)
Differential Input Signal Hysteresis
Differential Input DC Failsafe Threshold Voltage
(A–B)
Differential Input DC Failsafe Hysteresis
V
OUT
= 12V or –7V,
V
CC
= 0V or 3.3V (Figure 2)
–7V ≤ V
OUT
≤ 12V (Figure 2)
V
IN
= 12V or –7V, V
CC
= 0V or 3.3V
(Figure 3) (Note 5)
V
IN
= 12V or –7V, V
CC
= 0V or 3.3V
(Figure 3) (Note 5)
–7V ≤ (A or B) ≤ 12 (Note 5)
B = 0V (Notes 3, 5)
–7V ≤ (A or B) ≤ 12 (Note 5)
B = 0V (Note 5)
Output Low, I(RA) = 3mA (Sinking),
3V ≤ V
L
≤ 5.5V
Output Low, I(RA) = 1mA (Sinking),
1.7V ≤ V
L
< 3V
–100
–250
–100
125
125
250
125
RS485 Receiver
l
l
±200
190
–200
–65
30
0
mV
mV
mV
mV
l
V
OL
Output Low Voltage
l
l
l
l
l
l
l
0.4
0.4
V
L
– 0.4
V
L
– 0.4
0
108
120
±5
±135
156
V
V
V
V
μA
mA
Ω
V
OH
Output High Voltage
Output High, I(RA) = –3mA (Sourcing),
3V ≤ V
L
≤ 5.5V
Output High, I(RA) = –1mA (Sourcing),
1.7V ≤ V
L
< 3V
Three-State (High Impedance) Output Current
Short-Circuit Output Current
R
TERM
Terminating Resistor
0V ≤ RA ≤ V
L
, V
L
= 5.5V
0V ≤ RA ≤ V
L
, V
L
= 5.5V
TE485 = V
L
, A–B = 2V, B = –7V, 0V, 10V
(Figure 8) (Note 5)
2872f
3
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
