LTC490IS8 Linear Technology, LTC490IS8 Datasheet - Page 5
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LTC490IS8
Manufacturer Part Number
LTC490IS8
Description
IC TXRX RS485 LOWPWR DIFF 8-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet
1.LTC490CN8PBF.pdf
(12 pages)
Specifications of LTC490IS8
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)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC490IS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC490IS8#PBF
Manufacturer:
LT
Quantity:
6 500
Company:
Part Number:
LTC490IS8#PBF
Manufacturer:
LTC
Quantity:
1 067
Part Number:
LTC490IS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC490IS8#TRPBF
Manufacturer:
LT
Quantity:
20 000
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