FeaTures
n
®
LTM2882
Dual Isolated RS232
µModule Transceiver + Power
DescripTion
The
LTM
®
2882
is a complete galvanically isolated dual
RS232 µModule
®
(micromodule) transceiver. No external
components are required. A single 3.3V or 5V supply
powers both sides of the interface through an integrated,
isolated DC/DC converter. A logic supply pin allows easy
interfacing with different logic levels from 1.62V to 5.5V,
independent of the main supply.
Coupled inductors and an isolation power transformer
provide 2500V
RMS
of isolation between the line transceiver
and the logic interface. This device is ideal for systems
with different grounds, allowing for large common mode
voltages. Uninterrupted communication is guaranteed for
common mode transients greater than 30kV/μs.
This part is compatible with the TIA/EIA-232-F standard.
Driver outputs are protected from overload and can be
shorted to ground or up to ±15V without damage. An
auxiliary isolated digital channel is available. This channel
allows configuration for half-duplex operation by control-
ling the DE pin.
Enhanced ESD protection allows this part to withstand up
to ±10kV (human body model) on the transceiver interface
pins to isolated supplies and across the isolation barrier
to logic supplies without latchup or damage.
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RS232 Transceiver: 2500V
RMS
for 1 Minute
UL Recognized
File #E15178
Isolated DC Power: 5V at Up to 200mA
No External Components Required
1.62V to 5.5V Logic Supply for Flexible Digital
Interfacing
High Speed Operation
1Mbps for 250pF/3kΩ Load
250kbps for 1nF/3kΩ Load
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
3.3V (LTM2882-3) or 5V (LTM2882-5) Operation
No Damage or Latchup to ±10kV HBM ESD on
Isolated RS232 Interface or Across Isolation Barrier
High Common Mode Transient Immunity: 30kV/μs
Maximum Continuous Working Voltage: 560V
PEAK
True RS232 Compliant Output Levels
Low Profile (15mm
×
11.25mm) Surface Mount
BGA and LGA Packages
applicaTions
n
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Isolated RS232 Interface
Industrial Communication
Test and Measurement Equipment
Breaking RS232 Ground Loops
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 Dual RS232 µModule Transceiver
3.3V (LTM2882-3)
5V (LTM2882-5)
V
L
OFF ON
ON
ISOLATION BARRIER
DIN
T1IN
R1OUT
T2IN
R2OUT
GND
GND2
2882 TA01a
1Mbps Operation
5V/DIV
TIN
V
CC
LTM2882
V
CC2
DE
DOUT
T1OUT
5V
AVAILABLE CURRENT:
150mA (LTM2882-5)
100mA (LTM2882-3)
T1OUT/R1IN
10V/DIV
T2OUT/R2IN
R1OUT
R2OUT
5V/DIV
R1IN
T2OUT
R2IN
2882 TA01b
400ns/DIV
DRIVER OUTPUTS TIED TO RECEIVER INPUTS
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
For more information
www.linear.com/LTM2882
1
2882ff
LTM2882
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
1
A
B
C
D
E
F
G
H
I
J
K
L
R2IN T2OUT R1IN T1OUT DOUT
BGA PACKAGE
32-PIN (15mm
×
11.25mm
×
3.42mm)
T
JMAX
= 105°C,
θ
JA
= 30°C/W,
θ
JCtop
= 27.8°C/W,
θ
JCbottom
= 19.3°C/W,
θ
JB
= 24°C/W,
WEIGHT = 1.1g
DE
V
CC2
GND
2
3
4
5
DIN
6
ON
7
V
L
8
V
CC
R2OUT T2IN R1OUT T1IN
V
CC
to GND .................................................. –0.3V to 6V
V
L
to GND .................................................... –0.3V to 6V
V
CC2
to GND2 ............................................... –0.3V to 6V
Logic Inputs
T1IN, T2IN, ON, DIN to GND........–0.3V to (V
L
+ 0.3V)
DE to GND2............................. –0.3V to (V
CC2
+ 0.3V)
Logic Outputs
R1OUT, R2OUT to GND ...............–0.3V to (V
L
+ 0.3V)
DOUT to GND2........................ –0.3V to (V
CC2
+ 0.3V)
Driver Output Voltage
T1OUT, T2OUT to GND2 ...........................–15V to 15V
Receiver Input Voltage
R1IN, R2IN to GND2 ............................... –25V to 25V
Operating Temperature Range (Note 4)
LTM2882C .........................................0°C ≤ T
A
≤ 70°C
LTM2882I ..................................... –40°C ≤ T
A
≤ 85°C
Maximum Internal Operating Temperature............ 105°C
Storage Temperature Range .................. –40°C to 105°C
Peak Package Body Reflow Temperature .............. 245°C
GND2
LGA PACKAGE
32-PIN (15mm
×
11.25mm
×
2.8mm)
T
JMAX
= 105°C,
θ
JA
= 29°C/W,
θ
JCtop
= 27.9°C/W,
θ
JCbottom
= 18°C/W,
θ
JB
= 22.7°C/W,
WEIGHT = 1.1g
2
2882ff
For more information
www.linear.com/LTM2882
LTM2882
orDer inForMaTion
PART NUMBER
LTM2882CY-3#PBF
LTM2882IY-3#PBF
LTM2882HY-3#PBF
(OBSOLETE)
LTM2882MPY-3#PBF
(OBSOLETE)
LTM2882CY-5#PBF
LTM2882IY-5#PBF
LTM2882HY-5#PBF
(OBSOLETE)
LTM2882MPY-5#PBF
(OBSOLETE)
LTM2882CV-3#PBF
LTM2882IV-3#PBF
LTM2882CV-5#PBF
LTM2882IV-5#PBF
INPUT
VOLTAGE
3V to 3.6V
SAC305
(RoHS)
4.5V to 5.5V
LTM2882Y-5
PAD OR BALL
FINISH
PART MARKING
DEVICE
FINISH CODE
LTM2882Y-3
e1
BGA
3
PACKAGE
TYPE
MSL
RATING
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 105°C
–55°C to 105°C
0°C to 70°C
–40°C to 85°C
–40°C to 105°C
–55°C to 105°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
3V to 3.6V
Au (RoHS)
4.5V to 5.5V
LTM2882V-3
e4
LTM2882V-5
LGA
•
Device temperature grade is indicated by a label on the shipping
container.
•
Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal
Finish Part Marking:
www.linear.com/leadfree
•
This product is not recommended for second side reflow. For more
information, go to:
www.linear.com/BGA-assy
• Recommended
BGA and LGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• LGA
and BGA Package and Tray Drawings:
www.linear.com/packaging
•
This product is moisture sensitive. For more information, go to:
www.linear.com/umodule/pcbassembly
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2882-3 V
CC
= 3.3V, LTM2882-5 V
CC
= 5.0V, V
L
= V
CC
, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted.
SYMBOL
Supplies
V
CC
V
L
I
CC
Input Supply Range
Logic Supply Range
Input Supply Current
ON = 0V
LTM2882-3, No Load
LTM2882-5, No Load
V
CC2
Regulated Output Voltage, Loaded
LTM2882-3 DE = 0V, I
LOAD
= 100mA
LTM2882-5 DE = 0V, I
LOAD
= 150mA
V
CC2(NOLOAD)
Regulated Output Voltage, No Load
Efficiency
I
CC2
Driver
V
OLD
V
OHD
I
OSD
I
OZD
Driver Output Voltage Low
Driver Output Voltage High
Driver Short-Circuit Current
Driver Three-State (High Impedance)
Output Current
R
L
= 3kΩ
R
L
= 3kΩ
V
T1OUT
, V
T2OUT
= 0V, V
CC2
= 5.5V
DE = 0V, V
T1OUT
, V
T2OUT
= ±15V
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l
elecTrical characTerisTics
PARAMETER
CONDITIONS
LTM2882-3
LTM2882-5
l
l
l
l
l
l
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l
MIN
3.0
4.5
1.62
TYP
3.3
5.0
0
24
17
MAX
3.6
5.5
5.5
10
30
21
UNITS
V
V
V
µA
mA
mA
V
V
4.7
4.7
4.8
5.0
5.0
5.0
65
200
5.35
DE = 0, No Load
I
CC2
= 100mA, LTM2882-5 (Note 2)
V
%
mA
V
V
Output Supply Short-Circuit Current
–5
5
–5.7
6.2
±35
±0.1
±70
±10
mA
µA
For more information
www.linear.com/LTM2882
3
2882ff
LTM2882
elecTrical characTerisTics
SYMBOL
Receiver
V
IR
V
HYSR
R
IN
Logic
V
ITH
Logic Input Threshold Voltage
ON, T1IN, T2IN, DIN = 1.62V ≤ V
L
< 2.35V
ON, T1IN, T2IN, DIN = 2.35V ≤ V
L
≤ 5.5V
DE
I
INL
V
HYS
V
OH
Logic Input Current
Logic Input Hysteresis
Logic Output High Voltage
T1IN, T2IN, DIN (Note 2)
R1OUT, R2OUT
I
LOAD
= –1mA (Sourcing), 1.62V ≤ V
L
< 3.0V
I
LOAD
= –4mA (Sourcing), 3.0V ≤ V
L
≤ 5.5V
DOUT, I
LOAD
= –4mA (Sourcing)
V
OL
Logic Output Low Voltage
R1OUT, R2OUT
I
LOAD
= 1mA (Sinking), 1.62V ≤ V
L
< 3.0V
I
LOAD
= 4mA (Sinking), 3.0V ≤ V
L
≤ 5.5V
DOUT, I
LOAD
= 4mA (Sinking)
ESD (HBM)
(Note 2)
RS232 Driver and Receiver Protection
Isolation Boundary
(T1OUT, T2OUT, R1IN, R2IN) to (V
CC2
, GND2)
(T1OUT, T2OUT, R1IN, R2IN) to (V
CC
, V
L
, GND)
(V
CC2
, GND2) to (V
CC
, V
L
, GND)
±10
±10
±10
kV
kV
kV
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l
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l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2882-3 V
CC
= 3.3V, LTM2882-5 V
CC
= 5.0V, V
L
= V
CC
, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted.
PARAMETER
Receiver Input Threshold
Receiver Input Hysteresis
Receiver Input Resistance
–15V ≤ (V
R1IN
, V
R2IN
) ≤ 15V
CONDITIONS
Input Low
Input High
l
l
l
l
MIN
0.8
0.1
3
0.25•V
L
0.4
0.4
TYP
1.3
1.7
0.4
5
MAX
UNITS
V
2.5
1.0
7
0.75•V
L
0.67•V
L
0.67•V
CC2
±1
V
V
kΩ
V
V
V
µA
mV
V
V
V
150
V
L
– 0.4
V
L
– 0.4
V
CC2
– 0.4
0.4
0.4
0.4
V
V
V
swiTching characTerisTics
SYMBOL
PARAMETER
Maximum Data Rate
(T1IN to T1OUT, T2IN to T2OUT)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2882-3 V
CC
= 3.3V, LTM2882-5 V
CC
= 5.0V, V
L
= V
CC
, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted.
CONDITIONS
R
L
= 3kΩ, C
L
= 2.5nF (Note 3)
R
L
= 3kΩ, C
L
= 1nF (Note 3)
R
L
= 3kΩ, C
L
= 250pF (Note 3)
Maximum Data Rate (DIN to DOUT)
Driver
Driver Slew Rate (6V/t
THL
or t
TLH
)
t
PHLD
, t
PLHD
t
SKEWD
t
PZHD
, t
PZLD
t
PHZD
, t
PLZD
Driver Propagation Delay
Driver Skew |t
PHLD
– t
PLHD
|
Driver Output Enable Time
Driver Output Disable Time
R
L
= 3kΩ, C
L
= 50pF (Figure 1)
R
L
= 3kΩ, C
L
= 50pF (Figure 1)
R
L
= 3kΩ, C
L
= 50pF (Figure 1)
DE =
↑
, R
L
= 3kΩ, C
L
= 50pF (Figure 2)
DE =
↓
, R
L
= 3kΩ, C
L
= 50pF (Figure 2)
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MIN
100
250
1000
10
TYP
MAX
UNITS
kbps
kbps
kbps
Mbps
C
L
= 15pF (Note 3)
150
0.2
40
0.6
0.3
2
2
0.5
V/µs
µs
ns
µs
µs
4
2882ff
For more information
www.linear.com/LTM2882
LTM2882
swiTching characTerisTics
SYMBOL
Receiver
t
PHLR
, t
PLHR
t
SKEWR
t
RR
, t
FR
Auxiliary Channel
t
PHLL
, t
PLHL
t
RL
, t
FL
Power Supply
Power-Up Time
ON =
↑
to V
CC2(MIN)
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2882-3 V
CC
= 3.3V, LTM2882-5 V
CC
= 5.0V, V
L
= V
CC
, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted.
PARAMETER
Receiver Propagation Delay
Receiver Skew |t
PHLR
– t
PLHR
|
Receiver Rise or Fall Time
Propagation Delay
Rise or Fall Time
CONDITIONS
C
L
= 150pF (Figure 3)
C
L
= 150pF (Figure 3)
C
L
= 150pF (Figure 3)
C
L
= 15pF, t
R
and t
F
< 4ns (Figure 4)
C
L
= 150pF (Figure 4)
l
l
MIN
TYP
0.2
40
60
60
60
0.2
MAX
0.4
200
100
200
2
UNITS
µs
ns
ns
ns
ns
ms
l
l
isolaTion characTerisTics
SYMBOL
V
ISO
PARAMETER
Rated Dielectric Insulation Voltage
Common Mode Transient Immunity
V
IORM
Maximum Working Insulation Voltage
Partial Discharge
CTI
DTI
Comparative Tracking Index
Depth of Erosion
Distance Through Insulation
Input to Output Resistance
Input to Output Capacitance
Creepage Distance
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. LTM2882-3 V
CC
= 3.3V, LTM2882-5 V
CC
= 5.0V, V
L
= V
CC
, and GND =
GND2 = 0V, ON = V
L
unless otherwise noted.
CONDITIONS
1 Minute, Derived from 1 Second Test
1 Second (Notes 5, 6)
V
L
= ON = 3.3V, V
CM
= 1kV, ∆t = 33ns (Note 2)
(Notes 2, 5)
V
PR
= 1050 V
PEAK
(Notes 2, 5)
IEC 60112 (Note 2)
IEC 60112 (Note 2)
(Note 2)
(Notes 2, 5)
(Notes 2, 5)
(Notes 2, 5)
600
10
9
6
9.48
0.017
0.06
MIN
2500
±4400
30
560
400
5
TYP
MAX
UNITS
V
RMS
V
kV/µs
V
PEAK
V
RMS
pC
V
RMS
mm
mm
Ω
pF
mm
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Guaranteed by design and not subject to production test.
Note 3:
Maximum Data Rate is guaranteed by other measured parameters
and is not tested directly.
Note 4:
This device includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 105°C when overtemperature protection is active.
Continuous operation above specified maximum operating junction
temperature may result in device degradation or failure.
Note 5:
Tests performed from GND to GND2, all pins shorted each side of
isolation barrier.
Note 6:
The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
For more information
www.linear.com/LTM2882
5
2882ff
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