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PDF LTC1481IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1481IS8 | |
| Descripción | Ultra-Low Power RS485 Transceiver with Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1481
Ultra-Low Power
RS485 Transceiver
with Shutdown
FEATURES
s Low Power: ICC = 120µA Max with Driver Disabled
s ICC = 500µA Max with Driver Enabled, No Load
s Drivers/Receivers Have ±10kV ESD Protection
s 1µA Quiescent Current in Shutdown Mode
s High Speed: Up to 2.5Mbits/s Data Rate
s Single 5V Supply
s – 7V to 12V Common-Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
s Thermal Shutdown Protection
s Power Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
s Driver Maintains High Impedance in Three-State
or with the Power Off
s Up to 32 Transceivers on the Bus
s 30ns Typical Driver Propagation Delays
with 5ns Skew
s Pin Compatible with the LTC485
APPLICATI S
s Battery-Powered RS485/RS422 Applications
s Low Power RS485/RS422 Transceiver
s Level Translator
DESCRIPTIO
The LTC®1481 is an ultra-low power differential line trans-
ceiver designed for data transmission standard RS485
applications. It will also meet the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterparts without sacrificing ruggedness against
overload or ESD damage. Typical quiescent current is only
80µA while operating and less than 1µA in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open.
The LTC1481 is fully specified over the commercial and
extended industrial temperature range and is available in
8-pin DIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
RO1 R VCC1
RE1
Rt
DE1
DI1 D
GND1
Rt
RO2 R VCC2
RE2
DE2
DI2 D
GND2
LTC1481 • TA01
Supply Current vs Temperature
350
300 THERMAL SHUTDOWN
WITH DRIVER ENABLED
250
DRIVER ENABLED
200
150
100 DRIVER DISABLED
50
0
–50 –25
0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1481 TA02
1
1 page  
TEST CIRCUITS
A
VOD
R
R
B
LTC1481 • F01
VOC
Figure 1. Driver DC Test Load
3V
DE
A
DI
B
RDIFF
A
CL1
RO
B
CL2 RE 15pF
LTC1481 • F03
Figure 3. Driver/Receiver Timing Test Circuit
UW
W
SWITCHI G TI E WAVEFOR S
LTC1481
RECEIVER
OUTPUT
TEST POINT
S1
CRL 1k S2
1k
VCC
LTC1481 • F02
Figure 2. Receiver Timing Test Load
OUTPUT
UNDER TEST
500Ω
CL
S1
VCC
S2
LTC1481 • F04
Figure 4. Driver Timing Test Load
3V
DI
0V
B
A
VO
0V
– VO
1.5V f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
t PLH
VO
1/2 VO
10%
tr
tSKEW
90%
VDIFF = V(A) – V(B)
1.5V
t PHL
1/2 VO
t SKEW
90%
10%
tf
Figure 5. Driver Propagation Delays
LTC1481 • F05
3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
1.5V f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
tZL(SHDN), tZL
2.3V OUTPUT NORMALLY LOW
t LZ
1.5V
0.5V
2.3V OUTPUT NORMALLY HIGH
tZH(SHDN), tZH
t HZ
Figure 6. Driver Enable and Disable Times
0.5V
LTC1481 • F06
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1481IS8.PDF ] | |
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