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PDF LTM2881 Data sheet ( Hoja de datos )
| Número de pieza | LTM2881 | |
| Descripción | Transceiver + Power | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM2881 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Features
nn RS485/RS422 Transceiver: 2500VRMS for 1 Minute
nn UL-CSA Recognized
File #E151738
nn CSA Component Acceptance Notice 5A
nn Isolated DC Power: 5V at Up to 200mA
nn No External Components Required
nn 20Mbps or Low EMI 250kbps Data Rate
nn High ESD: ±15kV HBM on Transceiver Interface
nn High Common Mode Transient Immunity: 30kV/μs
nn Integrated Selectable 120Ω Termination
nn 3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation
nn 1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface
nn Maximum Continuous Working Voltage: 560VPEAK
nn High Input Impedance Failsafe RS485 Receiver
nn Current Limited Drivers and Thermal Shutdown
nn Compatible with TIA/EIA-485-A and PROFIBUS
nn High Impedance Output During Internal Fault Condition
nn Low Current Shutdown Mode (< 10µA)
nn General Purpose CMOS Isolated Channel
nn 15mm × 11.25mm BGA and LGA Packages
Applications
nn Isolated RS485/RS422 Interface
nn Industrial Networks
nn Breaking RS485 Ground Loops
nn Isolated PROFIBUS-DP Networks
LTM2881
Complete Isolated
RS485/RS422 µModule
Transceiver + Power
Description
The LTM®2881 is a complete galvanically isolated full-du-
plex RS485/RS422 µModule® (micromodule) transceiver.
No external components are required. A single supply
powers both sides of the interface through an integrated,
isolated, low noise, efficient 5V output DC/DC converter.
Coupled inductors and an isolation power transformer
provide 2500VRMS of isolation between the line transceiver
and the logic interface. This device is ideal for systems
where the ground loop is broken allowing for large com-
mon mode voltage variation. Uninterrupted communica-
tion is guaranteed for common mode transients greater
than 30kV/μs.
Maximum data rates are 20Mbps or 250kbps in slew
limited mode. Transmit data, DI and receive data, RO, are
implemented with event driven low jitter processing. The
receiver has a one-eighth unit load supporting up to 256
nodes per bus. A logic supply pin allows easy interfacing
with different logic levels from 1.62V to 5.5V, independent
of the main supply.
Enhanced ESD protection allows this part to withstand up
to ±15kV (human body model) on the transceiver interface
pins to isolated supplies and ±10kV through the isolation
barrier to logic supplies without latch-up or damage.
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.
Typical Application
Isolated Half-Duplex RS485 μModule Transceiver
LTM2881 Operating Through 35kV/μs CM Transients
3.3V (LTM2881-3)
5V (LTM2881-5)
VCC
VL
RO
RE
TE
DE
DI
PWR
LTM2881
VCC2
A
B
Y
Z
5V
AVAILABLE CURRENT:
150mA (LTM2881-5)
100mA (LTM2881-3)
MULTIPLE SWEEPS
OF COMMON MODE
TRANSIENTS
500V/DIV
TWISTED-PAIR
CABLE
1V/DIV
1V/DIV
DI
RO
50ns/DIV
2881 TA01a
GND GND2
2881 TA01
2881fi
For more information www.linear.com/LTM2881
1
1 page  
LTM2881
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications
= 0V, ON = VL unless otherwise noted.
are
at
TA
=
25°C.
LTM2881-3
VCC
=
3.3V,
LTM2881-5
VCC
=
5.0V,
VL
=
3.3V,
GND
=
GND2
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Logic
VIL Logic Input Low Voltage 1.62V ≤ VL ≤ 5.5V
VIH DIN
Logic Input High Voltage
SLO
DI, TE, DE, ON, RE:
VL ≥ 2.35V
1.62V ≤ VL < 2.35V
IINL Logic Input Current
VHYS Logic Input Hysteresis
(Note 2)
VOH Output High Voltage
O(SuotpuurctinHgig),h5, .I5LOVA≥D
= –4mA
VL ≥ 3V
Output High, ILOAD = –1mA
(Sourcing), 1.62V ≤ VL < 3V
VOL Output Low Voltage
Output Low, ILOAD = 4mA
(Sinking), 5.5V ≥ VL ≥ 3V
O(Suitnpkuint gH)i,g1h.,6I2LVOA≤D
= 1mA
VL < 3V
IOZR
Three-State (High Impedance)
Output Current on RO
RE = VL, 0V ≤ RO ≤ VL
l
l 0.67•VCC2
l2
l 0.67•VL
l 0.75•VL
l
0
150
l VL –0.4
l VL –0.4
0.4
±1
l 0.4
l 0.4
l ±1
V
V
V
V
V
µA
mV
V
V
V
V
µA
IOSR Short-Circuit Current
0V ≤ (RO or DOUT) ≤ VL
l ±85 mA
S witching Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications
= 0V, ON = VL unless otherwise noted.
are
at
TA
=
25°C.
LTM2881-3
VCC
=
3.3V,
LTM2881-5
VCC
=
5.0V,
VL
=
3.3V,
GND
=
GND2
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Driver SLO = VCC2
fMAX Maximum Data Rate
tPLHD
tPHLD
Driver Input to Output
∆tPD Driver Input to Output Difference
|tPLHD – tPHLD|
tSKEWD
Driver Output Y to Output Z
(Note 3)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
20
l
l
l
Mbps
60 85
ns
18
ns
1 ±8
ns
tRD Driver Rise or Fall Time
tFD
tZLD, tZHD, Driver Output Enable or Disable
tLZD, tHZD Time
Driver SLO = GND2
RDIFF = 54Ω, CL = 100pF
(Figure 4)
RL = 500Ω, CL = 50pF
(Figure 5)
l
4 12.5
ns
l 170 ns
fMAX
ttPPLHHLDD
∆tPD
tSKEWD
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|tPLHD – tPHLD|
Driver Output Y to Output Z
(Note 3)
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
RDIFF = 54Ω, CL = 100pF
(Figure 4)
250 kbps
1 1.55
µs
50 500
ns
±200 ±500
ns
tRD Driver Rise or Fall Time
tFD
RDIFF = 54Ω, CL = 100pF
(Figure 4)
l
0.9 1.5
µs
2881fi
For more information www.linear.com/LTM2881
5
5 Page 
TEST CIRCUITs
Y
DI DRIVER
Z
LTM2881
RDIFF
CL
CL
2881 F04a
VL
DI
0V
tPLHD
Y, Z VOD
1/2 VOD
tSKEWD
(Y-Z)
90%
10% 0
tRD
Figure 4. Driver Timing Measurement
tPHLD
90%
0 10%
t 2881 F04b
FD
Y
VL
OR
DI DRIVER
GND
DE Z
RL
CL
GND
OR
VCC2
RL
CL
VCC2
OR
GND
2881 F05a
VL
DE
0V
VCC2
Y OR Z
1/2 VL
tZLD
1/2 VCC2
Z OR Y
0V
1/2 VCC2
tZHD
Figure 5. Driver Enable and Disable Timing Measurements
tLZD
tHZD
0.5V
0.5V
2881 F05b
±VAB/2
VCM
±VAB/2
A
RECEIVER
B
RO
CL
2881 F06a
VAB
A-B
–VAB
VL
RO
0
tR
90%
10%
0
tPLHR
90%
10%
1/2 VL
tRR
Figure 6. Receiver Propagation Delay Measurements
tF
90%
10%
tPHLR
1/2 VL
90%
10%
t 2881 F06b
FR
For more information www.linear.com/LTM2881
2881fi
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM2881.PDF ] | |
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