LTC485CS8#TRPBF Linear Technology, LTC485CS8#TRPBF Datasheet - Page 8
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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
APPLICATIO S I FOR ATIO
The LTC485 output stage will maintain a high impedance
state until the breakdown of the N-channel or P-channel is
reached when going positive or negative respectively. The
output will be clamped to either V
voltage plus a Schottky diode drop, but this voltage is way
beyond the RS485 operating range. This clamp protects
the MOS gates from ESD voltages well over 2000V.
Because the ESD injected current in the N-well or substrate
consists of majority carriers, latchup is prevented by
careful layout techniques.
LTC485
8
RECEIVER
OUTPUTS
OUTPUT
DRIVER
RO
A
B
Figure 11. Receiver t
U U
CC
t
r
, t
or ground by a Zener
W
TTL IN
f
Figure 13. Receiver Propagation Delay Test Circuit
PHL
< 6ns
D
LTC485 • F11
U
100pF
R
100Ω
100pF
Propagation Delay
Many digital encoding schemes are dependent upon the
difference in the propagation delay times of the driver and
the receiver. Using the test circuit of Figure 13, Figures 11
and 12 show the typical LTC485 receiver propagation
delay.
The receiver delay times are:
The driver skew times are:
LTC485 • F13
RECEIVER
BR
OUTPUTS
OUTPUT
DRIVER
⏐
Skew = 5ns Typ, V
t
PLH
R
RO
– t
A
B
10ns Max, V
RECEIVER
OUT
PHL
Figure 12. Receiver t
⏐
= 9ns Typ, V
CC
CC
= 5V
= 5V, T
CC
PLH
= 5V
A
= – 40°C to 85°C
LTC485 • F12
sn485 LTC485ffs