Transmitter output pins conform to TIA/EIA-232E levels. The typical transmitter output swing is
±
8V when loaded 3kΩ load to ground. The open-circuit output voltage swings from (V+ − 0.6V)
to V−
Receiver inputs accept TIA/EIA-232
Transmitter input pins are TTL/CMOS compatible. Inputs of transmitter do not have pull-up
resistors. Connect all unused transmitter inputs to ground
Ground pin
Power supply pin for the device, +5V (
±
10%)
8,13
9, 12
10, 11
15
16
R1in, R2in
Tin1, Tin2
GND
V
S
R1out and R2out Receiver output pins are TTL/CMOS compatible
Ordering Information
Package
Part Number
LMS202CM
16-Pin SOIC
LMS202CMX
LMS202IM
LMS202IMX
LMS202CMW
16-Pin Wide SOIC
LMS202CMWX
LMS202IMW
LMS202IMWX
Package Marking
LMS202CM
LMS202IM
LMS202CMW
LMS202IMW
Transport Media
48 Units/Rail
2.5k Units Tape and Reel
48 Units/Rail
2.5k Units Tape and Reel
45 Units/Rail
1.0k Units Tape and Reel
45 Units/Rail
1.0k Units Tape and Reel
M16B
M16A
NSC Drawing
www.national.com
2
LMS202
Absolute Maximum Ratings
(Note 1)
Infrared or Convection
(20sec.)
Junction Temperature
Storage Temperature Range
235˚C
150˚C
−65˚C to +150˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
S
V+
V−
Driver Input Voltage, T
IN
Receiver Input Voltage, R
IN
Driver Output Voltage T
O
Receiver Output Voltage R
O
Short Circuit Duration, T
O
ESD Rating
Human Body Model (Note 2)
Machine Model (Note 6)
Soldering Information
2kV
200V
−0.3V to 6V
(V
S
− 0.3V) to + 14V
+0.3V to −14V
−0.3V to (V+ +0.3V)
Operating Ratings
Supply Voltage V
S
Ambient Temperature Range, T
A
Commercial (C)
Industrial (I)
Package Thermal Resistance
(Note 3)
SO
WSO
71˚C/W
55˚C/W
0˚C to +70˚C
−40˚C to +85˚C
4.5V to 5.5V
±
30V
(V− −0.3V to (V+ + 0.3V)
−0.3 to (V
S
+ 0.3)
Continuous
Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF
Symbol
DC Characteristics
I
S
Logic
I
INPUT
V
THL
V
THH
V
OL
V
OH
Input Leakage Current
Input Logic Theshold Low
Input Logic Theshold High
TTL/CMOS Output Voltage
Low
TTL/CMOS Output Voltage
High
Receiver Input Voltage
Range
Receiver Input Theshold
Low
Receiver Input Theshold
High
Receiver Input Hysteresis
Receiver Input Resistance
Transmitter Output Voltage
Swing
Output Resistance
Output Short Circuit Current
Maximum Data Rate
C
L
= 50pF to 1000pF,
R
L
= 3kΩ to 7kΩ
230
0.08
2.4
1
V
S
= 5V, T
A
= 25˚C
V
S
= 5V, T
A
= 25˚C
V
S
= 5V
V
S
= 5V, T
A
= 25˚C
All transmitters loaded with 3kΩ to GND
V
S
= V+ = V− = 0V,
V
O
=
±
2V
0.2
3
T
IN
= 0V to V
S
T
IN
T
IN
R
OUT
, I
OUT
= 3.2mA
R
OUT
, I
OUT
= −1.0mA
3.5
V
S
−0.1
2.0
0.4
Supply Current
No Load, T
A
= 25˚C
1
7
mA
µA
V
V
V
V
Parameter
Conditions
Min
(Note 5)
Typ
Max
(Note 5)
Units
±
10
0.8
RS-232 Receiver Inputs
V
RI
V
RTHL
V
RTHH
V
HYST
R
I
V
O
R
O
I
OS
DR
T
RPLH
T
RPHL
T
DPLH
T
DPHL
−30
0.8
1.4
2
0.6
5
2.4
1.0
7
+30
V
V
V
V
kΩ
V
Ω
RS-232 Transmitter Outputs
±
5
300
±
8
±
11
±
60
mA
kbps
µs
µs
Timing Characteristics
Receiver Propagation Delay C
L
= 150pF
Transmitter Propagation
Delay
R
L
= 3kΩ, C
L
= 2500pF
All transmitters loaded
3
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LMS202
Electrical Characteristics
Symbol
V
SLEW
Parameter
(Continued)
Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF
Conditions
Min
(Note 5)
3
Typ
6
Max
(Note 5)
30
Units
V/µs
Transition Region Slew Rate T
A
= 25˚C, V
S
= 5V
C
L
= 50pF to 1000pF, R
L
= 3kΩ to 7kΩ
Measured from +3V to −3V or vice versa
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2:
Human Body Model, 1.5kΩ in series with 100pF
Note 3:
The maximum power dissipation is a function of T
J(MAX),
θ
JA,
and T
A.
The maximum allowable power dissipation at any ambient temperature is P
D
=
(T
J(MAX)
− T
A
)/
θ
JA.
All numbers apply for packages soldered directly onto a PC board.
Note 4:
Typical Values represent the most likely parametric norm.
Note 5:
All limits are guaranteed by testing or statistical analysis
Note 6:
Machine model, 0Ω in series with 200pF
Typical Characteristics
Transmitter Output High Voltage vs. Load Capacitance
Transmitter Slew Rate vs. Load Capacitance
20062902
20062903
Application Information
CAPACITOR SELECTION
The recommended capacitors are 0.1µF. However, larger
capacitors for the charge pump may be used to minimized
ripples on V+ and V− pins.
POWER SUPPLY DECOUPLING
In some applications that are sensitive to power supply noise
from the charge pump, place a decoupling capacitor, Cbp,
from V
S
to GND. Use at least a 0.1µF capacitor or the same
size as the charge pump capacitors (C1 − C4).
CHARGED PUMP
The dual internal charged-pump provides the
±
10V to the to
transmitters. Using capacitor C1, the charge pump converts
+5V to +10V then stores the +10V in capacitor C3. The
charge pump uses capacitor C2 to invert the +10V to −10V.
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ADI Reference Circuit
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