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PDF LTC485 Data sheet ( Hoja de datos )
| Número de pieza | LTC485 | |
| Descripción | Low Power RS485 Interface Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Low Power: ICC = 300μA Typ
n Designed for RS485 Interface Applications
n Single 5V Supply
n –7V to 12V Bus Common Mode Range Permits
±7V Ground Difference Between Devices on the Bus
n Thermal Shutdown Protection
n Power-Up/Down Glitch-Free Driver Outputs
Permit Live Insertion or Removal of Transceiver
n Driver Maintains High Impedance in Three-State
or with the Power Off
n Combined Impedance of a Driver Output and
Receiver Allows Up to 32 Transceivers on the Bus
(C- and I-Grades)
n 70mV Typical Input Hysteresis
n 30ns Typical Driver Propagation Delays
with 5ns Skew for Up to 2.5MB Operation
n Pin Compatible with ±60V Protected LTC2862
APPLICATIONS
n Low Power RS485/RS422 Transceiver
n Level Translator
LTC485
Low Power RS485
Interface Transceiver
DESCRIPTION
The LTC®485 is a low power differential bus/line trans-
ceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over
its bipolar counterpart without sacrificing ruggedness
against overload or ESD damage.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common mode range. Excessive power dissipa-
tion 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 LTC485 is fully specified over the commercial and
extended industrial temperature range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
RO1 R VCC1
RE1 Rt
DE1
DI1 D
GND1
Rt
RO2 R VCC2
RE2
DE2
DI2 D
GND2
485 TA01a
Driver Outputs
A
B
485 TA01b
For more information www.linear.com/LTC485
485fk
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC485
RvsecTeeimveprer|taPtLuHre– tPHL|
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
485 G10
Driver Skew vs Temperature
5.4
4.8
4.2
3.6
3.0
2.4
1.8
1.2
0.6
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
485 G11
Supply Current vs Temperature
640
580
520
460 DRIVER ENABLED
400
340
DRIVER DISABLED
280
220
160
100
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
485 G12
PIN FUNCTIONS
RO (Pin 1): Receiver Output. If the receiver output is en-
abled (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 Output Enable. A high on DE enables
the driver outputs, 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.
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.
VCC (Pin 8): Positive Supply; 4.75 < VCC < 5.25.
For more information www.linear.com/LTC485
485fk
5
5 Page 
TYPICAL APPLICATION
Typical RS485 Network
Rt Rt
LTC485
485 TA02
PACKAGE DESCRIPTION
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
.045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
.300 BSC
(7.62 BSC)
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.005
(0.127)
MIN
.025
(0.635)
RAD TYP
.405
(10.287)
MAX
8 765
.220 – .310
(5.588 – 7.874)
1 234
.200
(5.080)
MAX
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.045 – .065
(1.143 – 1.651)
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
.125
3.175
MIN
J8 0801
For more information www.linear.com/LTC485
485fk
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC485.PDF ] | |
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