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.
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.
n
n
n
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Isolator μModule Technology
Isolated Dual RS232 Transceiver: 2500V
RMS
Integrated Isolated DC/DC Converter:
1W, 65% Efficiency
No External Components Required
1.62V to 5.5V Logic Supply for Flexible Digital
Interface
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 ESD HBM on
Isolated RS232 Interface or Across Isolation Barrier
High Common Mode Transient Immunity: 30kV/μs
Common Mode Working Voltage: 560V
PEAK
True RS232 Compliant Output Levels
Small Low Profile (15mm
×
11.25mm
×
2.8mm)
Surface Mount LGA Package
APPLICATIONS
n
n
n
n
Isolated RS232 Interface
Industrial Communication
Test and Measurement Equipment
Breaking RS232 Ground Loops
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
5V/DIV
R2OUT
R1IN
T2OUT
R2IN
2882 TA01b
400ns/DIV
DRIVER OUTPUTS TIED TO RECEIVER INPUTS
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
2882p
1
LTM2882
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
1
A
B
C
D
E
F
G
H
I
J
GND2
K
L
R2IN T2OUT R1IN T1OUT DOUT
LGA PACKAGE
32-PIN (15mm 11.25mm
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
Storage Temperature Range .................. –55°C to 125°C
Peak Reflow Temperature (Soldering, 10 sec)....... 245°C
2.8mm)
T
JMAX
= 125°C,
Θ
JA
= 29°C/W,
Θ
JC(TOP)
= 27.9°C/W,
Θ
JC(BOT)
= 18°C/W,
Θ
JBOARD
= 22.7°C/W, WEIGHT = 1.1g
ORDER INFORMATION
LEAD FREE FINISH
LTM2882CV-3#PBF
LTM2882IV-3#PBF
LTM2882CV-5#PBF
LTM2882IV-5#PBF
TRAY
LTM2882CV-3#PBF
LTM2882IV-3#PBF
LTM2882CV-5#PBF
LTM2882IV-5#PBF
PART MARKING*
LTM2882V-3
LTM2882V-3
LTM2882V-5
LTM2882V-5
PACKAGE DESCRIPTION
32-Pin (15mm
×
11.25mm
×
2.8mm) LGA
32-Pin (15mm
×
11.25mm
×
2.8mm) LGA
32-Pin (15mm
×
11.25mm
×
2.8mm) LGA
32-Pin (15mm
×
11.25mm
×
2.8mm) LGA
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
2882p
2
LTM2882
ELECTRICAL CHARACTERISTICS
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
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
2882p
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
CONDITIONS
LTM2882-3
LTM2882-5
l
l
l
l
l
l
l
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
5.35
250
DE = 0, No Load
I
CC2
= 100mA, LTM2882-5 (Note 2)
l
l
l
l
l
V
%
mA
V
V
Output Supply Short-Circuit Current
Driver Output Voltage Low
Driver Output Voltage High
Driver Short-Circuit Current
Driver Three-State (High Impedance)
Output Current
Receiver Input Threshold
Receiver Input Hysteresis
Receiver Input Resistance
–15V ≤ (V
R1IN
, V
R2IN
) ≤ 15V
R
L
= 3kΩ
R
L
= 3kΩ
V
T1OUT
, V
T2OUT
= 0V, V
CC2
= 5.5V
DE = 0V, V
T1OUT
, V
T2OUT
= ±15V
–5
5
–5.7
6.2
±35
±0.1
±70
±10
mA
μA
Input Low
Input High
l
l
l
l
l
l
l
l
0.8
0.1
3
0.25•V
L
0.4
0.4
1.3
1.7
0.4
5
2.5
1.0
7
0.75•V
L
0.67•V
L
0.67•V
CC2
±1
150
V
V
V
kΩ
V
V
V
μA
mV
V
V
V
0.4
0.4
0.4
V
V
V
l
l
l
l
l
l
V
L
– 0.4
V
L
– 0.4
V
CC2
– 0.4
3
LTM2882
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)
C
L
= 15pF
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)
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)
ON =
↑
to V
CC2(MIN)
l
l
l
l
l
l
l
l
l
l
MIN
100
250
1000
10
TYP
MAX
UNITS
kbps
kbps
kbps
Mbps
Driver
Driver Slew Rate (6V/t
THL
or t
TLH
)
t
PHLD
, t
PLHD
t
SKEWD
t
PZHD
, t
PZLD
t
PHZD
, t
PLZD
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
l
l
l
150
0.2
40
0.6
0.3
0.2
40
60
60
60
0.2
200
100
200
2
2
2
0.4
0.5
V/μs
μs
ns
μs
μs
μs
ns
ns
ns
ns
ms
Driver Propagation Delay
Driver Skew |t
PHLD
– t
PLHD
|
Driver Output Enable Time
Driver Output Disable Time
Receiver Propagation Delay
Receiver Skew |t
PHLR
– t
PLHR
|
Receiver Rise or Fall Time
Propagation Delay
Rise or Fall Time
ISOLATION CHARACTERISTICS
SYMBOL
V
ISO
PARAMETER
Rated Dielectric Insulation Voltage
Common Mode Transient Immunity
V
IORM
Maximum Working Insulation Voltage
Partial Discharge
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
(Note 2)
(Note 2)
V
PR
= 1050 V
PEAK
(Note 2)
(Note 2)
(Note 2)
(Note 2)
>10
9
6
9.48
MIN
2500
±4400
30
560
<5
TYP
MAX
UNITS
V
RMS
V
kV/μs
V
PEAK
pC
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 125°C when overtemperature protection is active.
Continuous operation above specified maximum operating junction
temperature may result in device degradation or failure.
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