LT1791 LINER [Linear Technology], LT1791 Datasheet - Page 3

• Manufacturer Part Number: LT1791
• Description: 60V Fault Protected RS485/RS422 Transceivers
• Manufacturer: LINER [Linear Technology]

DC ELECTRICAL CHARACTERISTICS
The
SYMBOL
V
V
V
V
V
I
I
V
V
V
R
I
I
IN1
IN2
SC
CC
OD1
OD2
OC
IH
IL
TH
OH
OL
V
V
IN
OD
V
TH
OC
denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 C, V
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (With Load)
Change in Magnitude of Driver Differential Output
Voltage for Complementary Output States
Driver Common Mode Output Voltage
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output States
Input High Voltage
Input Low Voltage
Input Current
Input Current (A, B); (LT1791 or LT1785 with
DE = 0V)
Differential Input Threshold Voltage for Receiver
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (High Impedance) Output Current
at Receiver 0V < V
Receiver Input Resistance (LT1791)
LT1785
RS485 Unit Load
Driver Short-Circuit Current
Driver Output Fault Current
Receiver Short-Circuit Current
Driver Three-State Output Current
Supply Current
OUT
< 6V
CONDITIONS
I
R = 50 (RS422), Figure 1
R = 27 (RS485), Figure 1
R = 18
R = 27 or R = 50 , Figure 1
R = 27 or R = 50 , Figure 1
R = 27 or R = 50 , Figure 1
DI, DE, RE
DI, DE, RE
DI, DE, RE
V
V
– 60V V
LT1785/LT1791: – 7V V
LT1785A/LT1791A: – 7V V
– 7V < V
I
I
RE > 2V or Power Off
– 7V V
– 60V V
– 7V V
V
V
V
V
0V V
–7V V
– 60V V
No Load, RE = 0V, DE = 5V
No Load, RE = 5V, DE = 5V
No Load, RE = 0V, DE = 0V
No Load, RE = 5V, DE = 0V
O
O
O
IN
IN
OUT
OUT
O
O
= 0
= – 400 A, V
= 1.6mA, V
= 60V
= – 60V
= 12V
= – 7V
= HIGH, Force V
= LOW, Force V
O
CM
CM
CM
O
IN
O
CM
V
< 12V
CC
12V
60V
ID
12V
12V
60V
ID
60V
= – 200mV
= 200mV
O
O
= 12V
= – 7V
CM
CM
12V
12V
– 0.15
– 0.2
– 0.2
– 0.2
MIN
2.0
1.5
1.2
3.5
– 6
– 1
85
50
35
35
– 6
– 6
2
2
LT1785/LT1785A
LT1791/LT1791A
– 0.08
2.70
2.45
0.15
TYP
125
125
4.1
2.2
2.5
0.3
5.5
5.5
4.5
0.2
20
90
4
MAX
0.25
250
250
0.2
0.2
0.8
0.3
0.2
0.5
0.3
0.3
5
3
5
6
0
1
6
6
9
9
8
30
CC
= 5V.
UNITS
3
mA
mA
mA
mV
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
k
k
k
V
V
V
V
V
V
V
V
V
A
V
V
V
V
A