LTC490CS8#PBF Linear Technology, LTC490CS8#PBF Datasheet - Page 5

• Manufacturer Part Number: LTC490CS8#PBF
• Description: IC TXRX RS485 LOW POWER 8-SOIC
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC490CS8#PBF

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Drivers: 1
• Supply Voltage Range: 4.75V To 5.25V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: 0°C To +70°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

PI FU CTIO S
SWITCHI G TI E WAVEFOR S
V
R (Pin 2): Receiver Output. If A > B by 200mV, R will be
high. If A < B by 200mV, then R will be low.
D (Pin 3): Driver Input. A low on D forces the driver outputs
Y low and Z high. A high on D will force Y high and Z low.
GND (Pin 4): Ground Connection.
TEST CIRCUITS
CC
U
A-B
V
(Pin 1): Positive Supply; 4.75V V
–V
D
O
–V
R
V
V
3V
0V
OD2
OD2
V
V
Y
O
O
Z
OH
OL
U
1/2 V
U
O
Figure 1. Driver DC Test Load
10%
50%
t
1.5V
PLH
t
Y
Z
U
PLH
0V
t
r
V
OD2
W
1.5V
80%
t
SKEW
LTC490 • F01
R
R
V
OC
CC
f = 1MHz : t
Figure 4. Receiver Propagation Delays
f = 1MHz ; t
Figure 3. Driver Propagation Delays
5.25V.
V
W
DIFF
r
= V(Y) – V(Z)
OUTPUT
r
INPUT
10ns : t
10ns : t
f
f
10ns
10ns
Y (Pin 5): Driver Output.
Z (Pin 6): Driver Output.
B (Pin 7): Receiver Input.
A (Pin 8): Receiver Input.
D
DRIVER
Figure 2. Driver/Receiver Timing Test Circuit
Y
Z
1/2 V
R
DIFF
O
90%
t
PHL
1.5V
t
PHL
0V
t
f
50%
C
C
1.5V
L1
L2
20%
t
SKEW
A
B
RECEIVER
LTC490
LTC490 • F02
LTC490 • F03
LTC490 • F04
5
490fb
15pF
R