|
|
PDF LTC2864 Data sheet ( Hoja de datos )
| Número de pieza | LTC2864 | |
| Descripción | (LTC2862 - LTC2865) RS485/RS422 Transceivers | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC2864 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
www.DataSheet.co.kr
LTC2862/LTC2863/
LTC2864/LTC2865
±60V Fault Protected 3V to 5.5V
RS485/RS422 Transceivers
FEATURES
n Protected from Overvoltage Line Faults to ±60V
n 3V to 5.5V Supply Voltage
n 20Mbps or Low EMI 250kbps Data Rate
n ±15kV ESD Interface Pins, ±8kV All Other Pins
n Extended Common Mode Range: ±25V
n Guaranteed Failsafe Receiver Operation
n High Input Impedance Supports 256 Nodes
n 1.65V to 5.5V Logic Supply Pin (VL) for Flexible
Digital Interface (LTC2865)
n H-Grade Option Available (–40°C to 125°C)
n Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
n Current Limited Drivers and Thermal Shutdown
n Pin Compatible with LT1785 and LT1791
n Available in DFN and Leaded Packages
APPLICATIONS
n Supervisory Control and Data Acquisition (SCADA)
n Industrial Control and Instrumentation Networks
n Automotive and Transportation Electronics
n Building Automation, Security Systems and HVAC
n Medical Equipment
n Lighting and Sound System Control
L, LT, LTC, LTM, Linear Technology the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LTC®2862/LTC2863/LTC2864/LTC2865 are low power,
20Mbps or 250kbps RS485/RS422 transceivers operating
on 3V to 5.5V supplies that feature ±60V overvoltage fault
protection on the data transmission lines during all modes
of operation, including power-down. Low EMI slew rate
limited data transmission is available in a logic-selectable
250kbps mode in the LTC2865 and in 250kbps versions of
the LTC2862-LTC2864. Enhanced ESD protection allows
these parts to withstand ±15kV HBM on the transceiver
interface pins without latchup or damage.
Extended ±25V input common mode range and full fail-
safe operation improve data communication reliability in
electrically noisy environments and in the presence of
large ground loop voltages.
PRODUCT SELECTION GUIDE
PART
NUMBER
LTC2862-1
LTC2862-2
LTC2863-1
LTC2863-2
LTC2864-1
LTC2864-2
LTC2865
DUPLEX
HALF
HALF
FULL
FULL
FULL
FULL
FULL
ENABLES
YES
YES
NO
NO
YES
YES
YES
MAX DATA
RATE (bps)
20M
250k
20M
250k
20M
250k
20M/250k
VL PIN
NO
NO
NO
NO
NO
NO
YES
TYPICAL APPLICATION
RS485 Link With Large Ground Loop Voltage
LTC2862
RO1 R
RE1
DE1
DI1 D
VCC1
Rt
VCC2
Rt
LTC2862
R
D
RO2
RE2
DE2
DI2
V GROUND LOOP
GND1
≤25V
GND2
2862345 TA01a
LTC2865 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
A,B
50V/DIV
A,B
A-B
0.5V/DIV
A-B
RO
5V/DIV
RO
100ns/DIV
2862345 TA01b
2862345f
1
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
LTC2862/LTC2863/
LTC2864/LTC2865
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V unless otherwise noted. (Note 2)
SYMBOL
Driver
|VOD|
Δ|VOD|
VOC
Δ|VOC|
IOSD
IOZD
Receiver
IIN
RIN
VCM
VTH
ΔVTH
VOH
VOL
IOZR
IOSR
Logic
VTH
IINL
Logic
VTH
IINL
PARAMETER
CONDITIONS
MIN
Differential Driver Output Voltage
Change in Magnitude of Driver Differential
Output Voltage
Driver Common-Mode Output Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
Maximum Driver Short-Circuit Current
Driver Three-State (High Impedance)
Output Current on Y and Z
R = ∞ (Figure 1)
R = 27Ω (Figure 1)
R = 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
l
l
l
l
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
l
l
–60V ≤ (Y or Z) ≤ 60V (Figure 2)
l
DE = 0V, VCC = 0V or 3.3V, VO = –25V, 25V l
1.5
1.5
2
Receiver Input Current (A,B)
(C-, I-Grade LTC2863, LTC2864, LTC2865)
Receiver Input Current (A,B)
(H-Grade LTC2863, LTC2864, LTC2865;
C-, I-, H-Grade LTC2862)
Receiver Input Resistance
Receiver Common Mode Input Voltage
(A + B)/2
Differential Input Signal Threshold
Voltage (A – B)
Differential Input Signal Hysteresis
Differential Input Failsafe Threshold Voltage
Differential Input Failsafe Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Three-State (High Impedance)
Output Current on RO
Receiver Short-Circuit Current
(LTC2862, LTC2863, LTC2864)
Input Threshold Voltage (DE, DI, RE)
Logic Input Current (DE, DI, RE)
(LTC2865)
Input Threshold Voltage (DE, DI, RE, SLO)
Logic Input Current (DE, DI, RE, SLO)
VCC = 0V or 3.3V, VIN = 12V (Figure 3)
VCC = 0V or 3.3V, VIN = –7V (Figure 3)
VCC = 0V or 3.3V, VIN = 12V (Figure 3)
VCC = 0V or 3.3V, VIN = –7V (Figure 3)
0 ≤ VCC ≤ 5.5V, VIN = –25V or 25V
(Figure 3)
–25V ≤ VCM ≤ 25V
VCM = 0V
–25V ≤ VCM ≤ 25V
VCM = 0V
I(RO) = –3mA (Sourcing)
VL ≥ 2.25V, I(RO) = –3mA (LTC2865)
VL < 2.25V, I(RO) = –2mA (LTC2865)
I(RO) = 3mA (Sinking)
RE = High, RO = 0V or VCC
RO = 0V or VL (LTC2865)
RE = Low, RO = 0V or VCC
RO = 0V or VL (LTC2865)
3.0 ≤ VCC ≤ 5.5V
0 ≤ VIN ≤ VCC
1.65V ≤ VL ≤ 5.5V
0 ≤ VIN ≤ VL
l
l –100
l
l –100
l –25
l
l –200
l VCC –0.4V
l VL –0.4V
l VL –0.4V
l
l
l
l 0.33 • VCC
l
l 0.33 • VL
l
TYP
±150
112
150
–50
25
0
0
MAX
VCC
5
VCC
0.2
3
0.2
±250
±30
125
143
25
±200
0
0.4
±5
±20
0.67 • VCC
±5
0.67 • VL
±5
UNITS
V
V
V
V
V
V
mA
μA
μA
μA
μA
μA
kΩ
V
mV
mV
mV
mV
V
V
μA
mA
V
μA
V
μA
2862345f
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
TEST CIRCUITS
LTC2862/LTC2863/
LTC2864/LTC2865
GND
OR DI
VCC*
Y**
DRIVER
+
VOD
–
Z**
R
R+
V–OC
2862345 FO1
*LTC2865 ONLY: SUBSTITUTE VL FOR VCC
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
Figure 1. Driver DC Characteristics
GND
OR DI
VCC*
Y**
DRIVER
Z**
IOSD
–+ –60V TO 60V
2862345 FO2
*LTC2865 ONLY: SUBSTITUTE VL FOR VCC
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
Figure 2. Driver Output Short-Circuit Current
IIN
VIN –+
A OR B
RECEIVER
B OR A
RIN
=
VIN
IIN
2862345 FO3
Figure 3. Receiver Input Current and Input Resistance
Y**
DI
DRIVER
RDIFF
CL
CL
Z**
2862345 FO4
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
VCC*
DI
0V
Y, Z
tPLHD
VO 1/2 VO
tSKEWD
(Y–Z)
90%
10% 0
tRD
*LTC2865 ONLY: SUBSTITUTE VL FOR VCC
Figure 4. Driver Timing Measurement
tPHLD
90%
0 10%
tFD
2862345 F04b
2862345f
11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC2864.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC2861 | 20Mbps RS485 Transceivers |  Linear Technology |
| LTC2862 | (LTC2862 - LTC2865) RS485/RS422 Transceivers | Linear Technology Corporation |
| LTC2863 | (LTC2862 - LTC2865) RS485/RS422 Transceivers | Linear Technology Corporation |
| LTC2864 | (LTC2862 - LTC2865) RS485/RS422 Transceivers | Linear Technology Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |