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PDF LTC1482IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1482IS8 | |
| Descripción | Low Power RS485 Transceiver with Carrier Detect and Receiver Fail-Safe | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s No Damage or Latchup to ±15kV (Human Body
Model), IEC1000-4-2 Level 4 (±8kV) Contact and
Level 3 (±8kV) Air Discharge
s Active Low Carrier Detect Output
s Guaranteed High Receiver Output State for
Floating, Shorted or Terminated Inputs with
No Signal Present
s Drives Low Cost Residential Telephone Wires
s Low Power: ICC = 700µA Max with Driver Disabled
s ICC = 900µA Max in Driver Mode Without Load
s 20µA Max Quiescent Current in Shutdown Mode
s Single 5V Supply
s – 7V to 12V Common Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
s Maximum Data Rate of 4Mbps
s Power Up/Down Glitch-Free Driver Outputs
s Up to 32 Transceivers on the Bus
s Available in 8-Lead MSOP, PDIP and SO Packages
U
APPLICATIO S
s Battery-Powered RS485/RS422 Applications
s Low Power RS485/RS422 Transceiver
s Level Translator
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1482
Low Power RS485 Transceiver
with Carrier Detect and
Receiver Fail-Safe
DESCRIPTIO
The LTC®1482 is a low power RS485 compatible trans-
ceiver that offers an active low carrier detect output. The
open-drain carrier detect pin allows several transceivers
to share the same carrier detect line and can be used to
detect the insertion or removal of a driven RS485/RS422
cable.
Enhanced ESD protection allows the LTC1482 to with-
stand ±15kV (human body model), IEC-1000-4-2 level 4
(±8kV) contact and level 3 (±8kV) air discharge ESD
without latchup or damage.
The LTC1482 receiver stays alive at all times except in
shutdown. The supply current is a maximum of 700µA
and 900µA when the driver is disabled and enabled
respectively. In shutdown, the quiescent current of the
LTC1482 drops to a maximum of 20µA.
When the driver is disabled or the LTC1482 is in shut-
down, the driver outputs are three-stated and remain in
a high impedance state over the RS485 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 LTC1482 is fully specified over the commercial and
industrial temperature ranges and is available in 8-lead
MSOP, PDIP and SO packages.
TYPICAL APPLICATIO
RO1
CD1
DE1
DI1/SHDN1
RS485 Interface
LTC1482
R
D
VCC1
B1
A1 120Ω
GND1
VCC2
B2
120Ω A2
GND2
LTC1482
R
D
RO2
CD2
DE2
DI2/SHDN2
1482 TA01
Carrier Detect Output (2000 Foot STP Cable)
DE1
A2
B2
CD2
DE1 ↑↓
DE2 = 0
1k PULL-UP AT CD
Dl1 = VCC
Dl2 = VCC
1482 TA01a
1
1 page  
LTC1482
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Input Offset Voltage vs
Temperature
0
–20 VCC = 5V
–40
–60
–80
–100
VCM = 12V
–120
–140
–160
VCM = 0V
VCM = –7V
–180
–200
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G04
Receiver Hysteresis vs
Temperature
100
90 VCC = 5V
80
70
60
50 VCM = –7V TO 12V
40
30
20
10
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G05
Carrier Detect Output Voltage vs
Receiver Input Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.25
–0.15 –0.05 0.05 0.15
RECEIVER INPUT VOLTAGE (V)
0.25
1482 G07
Carrier Detect Threshold Voltage
(Output High) vs Temperature
0.25
0.20
0.15
0.10
0.05
0
–0.05
POSITIVE
VTHCD(HIGH)
NEGATIVE VCM = 0V
VTHCD(HIGH)
VCM = 12V
VCM = –7V
VCM = 12V
–0.10
–0.15
VCM = 0V VCM = –7V
–0.20 VCC = 5V
–0.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G08
Receiver Output High Voltage vs
Temperature
4.5
4.4
VCC = 4.75V
IOUT = –8mA
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G10
Carrier Detect Output High
Voltage vs Output Current
5.0
4.5
VCC = 4.75V
TA = 25°C
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–35 –30 –25 –20 –15 –10
OUTPUT CURRENT (µA)
–5 0
1482 G11
Receiver Input Threshold Voltage
vs Supply Voltage
0
–0.02
TA = 25°C
–0.04
–0.06
–0.08
VTHRO(HIGH)
–0.10
–0.12
VTHRO(LOW)
–0.14
–0.16
–0.18
–0.20
4.5
4.75 5 5.25
SUPPLY VOLTAGE (V)
5.5
1482 G06
Carrier Detect Threshold Voltage
(Output Low) vs Temperature
0.25
0.20 POSITIVE
VTHCD(LOW)
VCM = 12V
0.15
VCM = –7V
0.10 VCM = 0V
0.05
0
–0.05
–0.10
–0.15
–0.20
NEGATIVE
VTHCD(LOW)
VCC = 5V
VCM = 12V
VCM = 0V VCM = –7V
–0.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G09
Receiver and Carrier Detect
Output Low Voltage vs Output
Current
40
35
TA = 25°C
VCC = 4.75
30
25
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
OUTPUT LOW VOLTAGE (V)
1482 G12
5
5 Page 
UW
W
SWITCHI G TI E WAVEFOR S
VOD2
A–B
– VOD2
0V
VOH
CD
VOL
NOTE: 1kΩ PULL-UP AT CD
t CDL
1.5V
INPUT
t CDH
Figure 10. Carrier Detect Timing
1.5V
5V
DI
0V
VOH
CD
VOL
1.5V
t CDH(SHDN)
VOD2
A–B
– VOD2
5V
RO
0V
NOTE: 1kΩ PULL-UP AT CD
1.5V
THREE-STATE
1.5V
t CDL(SHDN)
Figure 11. Shutdown Carrier Detect Timing
1.5V
LTC1482
1482 F10
1482 F11
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1482IS8.PDF ] | |
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