Datasheet

LTC2872
4
2872f
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_1 = TE485_2 = 0V, LB = 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS232 Driver
V
OLD
Output Low Voltage R
L
= 3kΩ, V
EE
≤ –6V
l
–5 –5.7 V
EE
V
V
OHD
Output High Voltage R
L
= 3kΩ, V
DD
≥ 6.5V
l
5 6.2 V
DD
V
Three-State (High Impedance) Output Current Y or Z = ±15V
l
±156 µA
Output Short-Circuit Current Y or Z = 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) = 1mA (Sinking),
1.7V ≤ V
L
≤ 5.5V
l
0.4 V
Output High Voltage I(RA, RB) = –1mA (Sourcing),
1.7V ≤ V
L
≤ 5.5V
l
V
L
– 0.4 V
Input Resistance –15V ≤ (A, B) ≤ 15V, Receiver Enabled
l
3 5 7 kΩ
Three-State (High Impedance) Output Current 0V ≤ (RA, RB) ≤ V
L
l
0 ±5 μA
Output Short-Circuit Current V
L
= 5.5V, 0V ≤ (RA, RB) ≤ 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
L
= 3kΩ to GND, DY1 = DY2 = V
L
,
DZ1 = DZ2 = 0V (Note 3)
7 V
V
EE
Regulated V
EE
Output Voltage –6.3 V
ESD
Interface Pins (A, B, Y, Z) Human Body Model to GND or V
CC
, Powered
or Unpowered (Note 7)
±16 kV
All Other Pins Human Body Model (Note 7) ±4 kV
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