Datasheet

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