LT1785 Linear Technology, LT1785 Datasheet - Page 4

• Manufacturer Part Number: LT1785
• Description: 60V Fault Protected RS485/RS422 Transceivers
• Manufacturer: Linear Technology

SWITCHI G CHARACTERISTICS
LT1785/LT1785A
LT1791/LT1791A
The
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
f
t
t
t
t
t
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
TYPICAL PERFORMANCE CHARACTERISTICS
4
PLH
PHL
SKEW
r
ZH
ZL
LZ
HZ
PLH
PHL
SKD
ZL
ZH
LZ
HZ
MAX
SHDN
ZH(SHDN)
ZL(SHDN)
ZH(SHDN)
ZL(SHDN)
, t
f
4
3
2
1
0
10
Driver Differential Output Voltage
vs Load Resistance
denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 C, V
T
A
= 25 C
PARAMETER
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
Receiver Input to Output
Differential Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
Maximum Data Rate
Time to Shut Down
Driver Enable from Shutdown to Output High
Driver Enable from Shutdown to Output Low
Receiver Enable from Shutdown to Output High
Receiver Enable from Shutdown to Output Low
LOAD RESISTANCE ( )
U
100
W
1785/91 G01
U
1k
3.0
2.5
2.0
1.5
1.0
0.5
0
–40
Driver Differential Output Voltage
vs Temperature
R = 27
CONDITIONS
Figures 3, 5
Figures 3, 5
Figures 3, 5
Figures 3, 5
Figures 4, 6
Figures 4, 6
Figures 4, 6
Figures 4, 6
Figures 3, 7
Figures 3, 7
Figures 2, 8
Figures 2, 8
Figures 2, 8
Figures 2, 8
Figures 2, 6, 8
Figures 2, 6; RE = 5V
Figures 2, 6; RE = 5V
Figures 2, 8; DE = 0V
Figures 2, 8; DE = 0V
–20
0
TEMPERATURE ( C)
20
40
60
80
1785/91 G03
100
1000
800
600
400
200
0
MIN
200
250
–40
Receiver Propagation Delay
vs Temperature
–20
0
TEMPERATURE ( C)
TYP
700
700
100
800
500
800
200
800
400
400
200
300
300
400
400
12
12
3
4
4
20
t
t
PHL
PLH
40
2000
2000
2000
3000
3000
5000
5000
1000
1000
1000
1000
MAX
900
900
60
CC
80
1785/91 G03
= 5V.
UNITS
kbps
100
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
s
s