LTC485CS8#TRPBF Linear Technology, LTC485CS8#TRPBF Datasheet - Page 5
LTC485CS8#TRPBF
Manufacturer Part Number
LTC485CS8#TRPBF
Description
IC TXRX INTRFC RS485 LOPWR 8SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Specifications of LTC485CS8#TRPBF
Number Of Drivers/receivers
1/1
Protocol
RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Interface Circuit Standard 1
RS-485
Number Of Receivers
1
Number Of Transmitters
1
Number Of Transceivers
1
Data Transmission Topology
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
0.9mA
Power Supply Requirement
Single
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
PI FU CTIO S
SWITCHI G TI E WAVEFOR S
TEST CIRCUITS
RO (Pin 1): Receiver Output. If the receiver output is
enabled(RE low), then if A > B by 200mV, RO will be high.
If A < B by 200mV, then RO will be low.
RE (Pin 2): Receiver Output Enable. A low enables the
receiver output, RO. A high input forces the receiver
output into a high impedance state.
DE (Pin 3): Driver Outputs Enable. A high on DE enables
the driver output. A and B, and the chip will function as a
line driver. A low input will force the driver outputs into a
high impedance state and the chip will function as a line
receiver.
U
DI
DI
3V
Figure 3. Driver/Receiver Timing Test Circuit
DE
–V
U
3V
0V
V
0V
B
A
O
O
A
B
U
Figure 1. Driver DC Test Load
A
B
R
U
DIFF
V
W
OD
LTC485 • F01
V
O
1/2 V
R
R
C
C
L1
L2
O
t
10%
V
r
A
B
OC
1.5V
Figure 5. Driver Propagation Delays
80%
t
t
RE
PLH
SKEW
W
15pF
f = 1MHz, t
LTC485 • F03
RO
V
r
DIFF
≤ 10ns, t
= V(A) – V(B)
DI (Pin 4): Driver Input. If the driver outputs are enabled
(DE high), then a low on DI forces the outputs A low and
B high. A high on DI with the driver outputs enabled will
force A high and B low.
GND (Pin 5): Ground Connection.
A (Pin 6): Driver Output/Receiver Input.
B (Pin 7): Driver Output/Receiver Input.
V
f
CC
≤ 10ns
(Pin 8): Positive Supply; 4.75 < V
RECEIVER
UNDER TEST
OUTPUT
t
PLH
OUTPUT
Figure 4. Driver Timing Test Load #2
Figure 2. Receiver Timing Test Load
t
f
TEST POINT
1.5V
90%
C
15pF
20%
RL
t
SKEW
C
500Ω
L
1/2 V
1k
O
S1
S2
S1
S2
CC
LTC485 • F05
< 5.25.
1k
LTC485 • F02
LTC485
LTC485 • F02
V
CC
sn 485LTC485ffs
V
CC
5