LMS202IMX [NSC]
5V Single Supply TIA/EIA-232 Dual Transceivers; 5V单电源TIA / EIA- 232双收发器
| 型号： | LMS202IMX |
| 厂家： | 
National Semiconductor |
| 描述： | 5V Single Supply TIA/EIA-232 Dual Transceivers |
| 文件： | 总5页 (文件大小：100K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2003
LMS202
5V Single Supply TIA/EIA-232 Dual Transceivers
General Description
Features
n Single +5V power supply
n 230 kbps data rate
The LMS202 features two transmitters and two receivers for
RS-232 communication. It has a DC-to-DC converter that
permits the device to operate with only a single +5V power
supply. The on-chip DC-to-DC converter which utilizes four
external 0.1µF capacitors to generate dual internal power
supplies for RS-232 compatible output levels.
n On-board DC-to-DC converter
n 0.1µF charge pump capacitors
n Drop-in replacement to Maxim’s MAX202
The device meet EIA/TIA-232E and CCITT V.28 specifica-
tions up to 230kbits/sec. The LMS202 is available in a 16 pin
narrow and Wide SOIC package.
Applications
n POS equipment (Bar code reader)
n Hand-held equipment
n General purpose RS-232 communication
Connection Diagram and Typical Circuit
20062901
© 2003 National Semiconductor Corporation
DS200629
www.national.com
Pin Descriptions
Pin Number
Pin Name
C1+, C1−
V+
Pin Function
1, 3
2
External capacitor connection pins. Recommended external capacitor C1 = 0.1µF (6.3V)
Positive supply for TIA/EIA-232E drivers. Recommended external capacitor C4 = 0.1µF (6.3V)
External capacitor connection pins. Recommended external capacitor C2 = 0.1µF (16V)
Negative supply for TIA/EIA-232E drivers. Recommended external capacitor C3 = 0.1µF (16V)
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−
4, 5
6
C2+, C2−
V−
7, 14
T1out, T2out
8,13
R1in, R2in
Receiver inputs accept TIA/EIA-232
9, 12
10, 11
R1out and R2out Receiver output pins are TTL/CMOS compatible
Tin1, Tin2
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
15
16
GND
VS
Power supply pin for the device, +5V ( 10%)
Ordering Information
Package
Part Number
Package Marking
LMS202CM
Transport Media
48 Units/Rail
NSC Drawing
M16A
LMS202CM
LMS202CMX
LMS202IM
2.5k Units Tape and Reel
48 Units/Rail
16-Pin SOIC
LMS202IM
LMS202CMW
LMS202IMW
LMS202IMX
LMS202CMW
LMS202CMWX
LMS202IMW
LMS202IMWX
2.5k Units Tape and Reel
45 Units/Rail
1.0k Units Tape and Reel
45 Units/Rail
16-Pin Wide SOIC
M16B
1.0k Units Tape and Reel
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Infrared or Convection
(20sec.)
235˚C
Junction Temperature
Storage Temperature Range
150˚C
−65˚C to +150˚C
VS
−0.3V to 6V
(VS − 0.3V) to + 14V
+0.3V to −14V
V+
Operating Ratings
V−
Supply Voltage VS
Ambient Temperature Range, TA
Commercial (C)
Industrial (I)
4.5V to 5.5V
Driver Input Voltage, TIN
Receiver Input Voltage, RIN
Driver Output Voltage TO
Receiver Output Voltage RO
Short Circuit Duration, TO
ESD Rating
−0.3V to (V+ +0.3V)
30V
0˚C to +70˚C
(V− −0.3V to (V+ + 0.3V)
−0.3 to (VS + 0.3)
Continuous
−40˚C to +85˚C
Package Thermal Resistance
(Note 3)
SO
71˚C/W
55˚C/W
Human Body Model (Note 2)
Machine Model (Note 6)
Soldering Information
2kV
WSO
200V
Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 5)
(Note 5)
DC Characteristics
IS
Supply Current
No Load, TA = 25˚C
1
7
mA
Logic
IINPUT
VTHL
VTHH
VOL
Input Leakage Current
TIN = 0V to VS
10
µA
V
Input Logic Theshold Low
Input Logic Theshold High
TIN
TIN
0.8
2.0
3.5
V
TTL/CMOS Output Voltage ROUT, IOUT = 3.2mA
0.4
V
Low
VOH
TTL/CMOS Output Voltage ROUT, IOUT = −1.0mA
High
VS −0.1
V
RS-232 Receiver Inputs
VRI
Receiver Input Voltage
−30
0.8
+30
2.4
V
V
V
Range
VRTHL
VRTHH
Receiver Input Theshold
Low
VS = 5V, TA = 25˚C
VS = 5V, TA = 25˚C
1.4
2
Receiver Input Theshold
High
VHYST
RI
Receiver Input Hysteresis
Receiver Input Resistance
VS = 5V
0.2
3
0.6
5
1.0
7
V
VS = 5V, TA = 25˚C
kΩ
RS-232 Transmitter Outputs
VO
RO
IOS
Transmitter Output Voltage All transmitters loaded with 3kΩ to GND
Swing
5
8
V
Ω
Output Resistance
VS = V+ = V− = 0V,
VO 2V
300
=
Output Short Circuit Current
11
60
1
mA
kbps
µs
Timing Characteristics
DR
Maximum Data Rate
CL = 50pF to 1000pF,
230
RL = 3kΩ to 7kΩ
TRPLH
TRPHL
TDPLH
TDPHL
Receiver Propagation Delay CL = 150pF
0.08
2.4
Transmitter Propagation
Delay
RL = 3kΩ, CL = 2500pF
All transmitters loaded
µs
3
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Electrical Characteristics (Continued)
Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF
Symbol
Parameter
Conditions
Min
(Note 5)
3
Typ
Max
(Note 5)
30
Units
VSLEW
Transition Region Slew Rate TA = 25˚C, VS = 5V
CL = 50pF to 1000pF, RL = 3kΩ to 7kΩ
Measured from +3V to −3V or vice versa
6
V/µs
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
θ
and T The maximum allowable power dissipation at any ambient temperature is P
=
J(MAX), JA,
A.
D
(T
− T )/ θ All numbers apply for packages soldered directly onto a PC board.
J(MAX)
A JA.
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
CHARGED PUMP
Application Information
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.
The −10V is then stored in capacitor C4.
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 VS to GND. Use at least a 0.1µF capacitor or the same
size as the charge pump capacitors (C1 − C4).
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4
Physical Dimensions inches (millimeters) unless otherwise noted
16-Pin SOIC
NS Package Number M16A
16-Pin Wide SOIC
NS Package Number M16B
5
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