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PDF LTC1483CN8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1483CN8 | |
| Descripción | Ultra-Low Power RS485 Low EMI Transceiver with Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1483
Ultra-Low Power RS485 Low EMI
Transceiver with Shutdown
FEATURES
s Low Power: ICC = 120µA Max with Driver Disabled
s ICC = 500µA Max with Driver Enabled, No Load
s 1µA Quiescent Current in Shutdown Mode
s Controlled Slew Rate Driver for Reduced EMI
s Single 5V Supply
s Drivers/Receivers Have ±10kV ESD Protection
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 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®1483 is an ultra-low power differential line trans-
ceiver designed for data transmission standard RS485
applications with extended common-mode range (– 7V to
12V). It will also meet the requirements of RS422. The
LTC1483 features output drivers with controlled slew rate,
decreasing the EMI radiated from the RS485 lines, and
improving signal fidelity with misterminated lines. 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. I/O pins are protected against multiple
ESD strikes of over ±10kV.
The LTC1483 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
RTERM
DE1
DI1 D
GND1
RTERM
RO2 R VCC2
RE2
DE2
DI2 D
GND2
LTC1483 • TA01
DI
A–B
RO
1483 TA02
1
1 page  
TEST CIRCUITS
A
VOD
R
R
B
LTC1483 • F01
VOC
Figure 1. Driver DC Test Load
LTC1483
RECEIVER
OUTPUT
TEST POINT
S1
CRL
1k
S2
1k
VCC
LTC1483 • F02
Figure 2. Receiver Timing Test Load
3V
DE
A
DI
B
RDIFF
A
CL1
B
CL2
RO
RE 15pF
LTC1483 • F03
Figure 3. Driver/Receiver Timing Test Circuit
OUTPUT
UNDER TEST
500Ω
CL
S1
VCC
S2
LTC1483 • F04
Figure 4. Driver Timing Test Load
UW
W
SWITCHI G TI E WAVEFOR S
3V
DI
0V
B
A
VO
0V
– VO
1.5V
t PLH
tr ≤ 10ns, tf ≤ 10ns
1.5V
t PHL
1/2 VO
VO
1/2 VO
10%
tr
tSKEW
90%
VDIFF = V(A) – V(B)
t SKEW
90%
10%
tf
Figure 5. Driver Propagation Delays
LTC1483 • F05
3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
1.5V 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
LTC1483 • F06
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1483CN8.PDF ] | |
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