LTC491IS#TR Linear Technology, LTC491IS#TR Datasheet - Page 6

• Manufacturer Part Number: LTC491IS#TR
• Description: IC TXRX RS485 LOW POWER 14-SOIC
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC491IS#TR

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SWITCHI G TI E WAVEFOR S
LTC491
6
REB
A-B
A, B
A, B
V
DE
R
R
R
D
O
–V
–V
V
V
V
V
V
3V
0V
V
V
V
3V
0V
5V
OH
0V
OD2
OD2
3V
0V
5V
OH
0V
OL
OL
O
O
Z
Y
OH
OL
1/2 V
U
O
10%
50%
t
1.5V
PLH
t
PLH
0V
t
r
W
80%
1.5V
t
SKEW
t
1.5V
ZH
1.5V
t
t
t
ZH
ZL
ZL
1.5V
2.3V
2.3V
1.5V
Figure 8. Receiver Enable and Disable Times
Figure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
f = 1MHz : t
Figure 5. Driver Propagation Delays
f = 1MHz ; t
W
V
DIFF
r
= V(Y) – V(Z)
OUTPUT
r
f = 1MHz : t
f = 1MHz : t
INPUT
10ns : t
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
OUTPUT NORMALLY LOW
10ns : t
f
f
10ns
r
r
10ns
10ns : t
10ns : t
f
r
10ns
10ns
1/2 V
O
90%
t
PHL
1.5V
t
PHL
0V
t
t
t
t
t
f
LZ
HZ
LZ
HZ
1.5V
1.5V
50%
1.5V
20%
t
SKEW
0.5V
0.5V
0.5V
0.5V
LTC491 • F06
LTC491 • F08
LTC491 • F05
LTC491 • F07
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