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

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

Specifications of LTC491IS#PBF

• 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
• Data Rate: 2.5Mbps
• Interface Circuit Standard 1: RS-422/RS-485
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Number Of Transceivers: 1
• Data Transmission Topology: Multidrop/Multipoint
• Receiver Signal Type: Differential
• Transmitter Signal Type: Differential
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.75V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Supply Current: 0.5mA
• Power Supply Requirement: Single
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: SOIC N
• No. Of Drivers: 1
• Supply Voltage Range: 4.75V To 5.25V
• Driver Case Style: SOIC
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Ic Interface Type: RS422, RS485
• Lead Free Status / RoHS Status: Lead free / RoHS 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
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