Datasheet

3
LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
V
CC
= V
DD
(LTC1321/LTC1322) = 5V ±5%, V
EE
= –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS485 Driver (SEL1 = SEL2 = HIGH)
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 5V
V
OD2
Differential Driver Output Voltage (With Load) Figure 1, R = 50 (RS422) 2.0 5 V
Figure 1, R = 27 (RS485) 1.5 5 V
V
OD
Change in Magnitude of Driver Differential Figure 1, R = 27 or R = 50 0.2 V
Output Voltage for Complementary Output States
V
OC
Driver Common-Mode Output Voltage Figure 1, R = 27 or R = 50 3V
∆V
OC
Change in Magnitude of Driver Common-Mode Figure 1, R = 27 or R = 50 0.2 V
Output Voltage for Complementary Output States
I
OSD
Driver Short-Circuit Current 7V V
O
12V, V
O
= HIGH 35 250 mA
7V V
O
12V, V
O
= LOW (Note 4) 10 250 mA
I
OZD
Three-State Output Current (Y, Z) 7V V
O
12V ±5 ±500 µA
EIA/TIA-562 Driver (SEL1 = SEL2 = LOW)
V
O
Output Voltage Swing Figure 4, R
L
= 3k, Positve 3.7 4.2 V
Figure 4, R
L
= 3k, Negative 3.7 4.3 V
I
OSD
Output Short-Circuit Current V
O
= 0V ±11 ±60 mA
Driver Inputs and Control Inputs
V
IH
Input High Voltage D, DE, ON/OFF, SEL1, SEL2, LB 2V
OE (LTC1335) 2V
V
IL
Input Low Voltage D, DE, ON/OFF, SEL1, SEL2, LB 0.8 V
OE (LTC1335)
0.8 V
I
IN
Input Current D, SEL1, SEL2 ±10 µA
DE, ON/OFF, LB –4 15 µA
OE (LTC1335)
4 15 µA
RS485 Receiver (SEL1 = SEL2 = HIGH)
V
TH
Differential Input Threshold Voltage 7V V
CM
7V, Commercial 0.2 0.2 V
7V V
CM
7V, Industrial 0.3 0.3 V
V
TH
Input Hysteresis V
CM
= 0V 70 mV
I
IN
Input Current (A, B) 7V V
IN
12V ±1mA
R
IN
Input Resistance 7V V
IN
12V 12 24 k
EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW)
V
TH
Receiver Input Voltage Threshold Input Low Threshold 0.8 1.1 V
Input High Threshold
1.7 2.4 V
V
TH
Receiver Input Hysteresis 0.1 0.6 1.0 V
R
IN
Receiver Input Resistance V
IN
= ±10V 3 5 7 k
Receiver Output
V
OH
Receiver Output High Voltage I
O
= –3mA, V
IN
= 0V, SEL1 = SEL2 = LOW 3.5 4.6 V
V
OL
Receiver Output Low Voltage I
O
= 3mA, V
IN
= 3V, SEL1 = SEL2 = LOW 0.2 0.4 V
I
OSR
Short-Circuit Current 0V V
O
V
CC
785mA
I
OZR
Three-State Output Current ON/OFF = 0V ±10 µA
OE = V
CC
(LTC1335) ±10 µA