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PDF LMS202E Data sheet ( Hoja de datos )
| Número de pieza | LMS202E | |
| Descripción | 15KV ESD Rated / 5V Single Supply TIA/EIA-232 Dual Transceivers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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March 2003
LMS202E
15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual
Transceivers
General Description
The LMS202E 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.
The device meet EIA/TIA-232E and CCITT V.28 specifica-
tions up to 230kbits/sec. The LMS202E is available in a 16
pin narrow and wide SOIC package.
The transmitter outputs and receiver inputs have ±15kV
electrostatic discharge (ESD) protection. The LMS202E sur-
vives a ± 15kV ESD event to the RS-232 input and output
pins when subjected according to Human Body Model or IEC
1000-4-2 (EN61000-4-2),air-gap specification. It survives a
±8kV discharge when subjected to IEC 1000-4-2 (EN61000-
4-2), contact specification. This device is designed for use in
harsh environments where ESD is a concern.
Features
n ESD protection for RS-232 I/O pins
— ±15kV-IEC1000 4-2 (EN61000-4-2) Contact
Discharge
— ±8kV-IEC1000 4-2 (EN61000-4-2) Air-Gap Discharge
— ±15kV Human Body Model
n Single +5V power supply
n 230 kbps data rate
n On-board DC-to-DC converter
n 0.1µF charge pump capacitors
n Drop-in replacement to Maxim’s MAX202E
Applications
n POS equipment (Bar code reader)
n Hand-held equipment
n General purpose RS-232 communication
Connection Diagram and Typical Circuit
© 2003 National Semiconductor Corporation DS200480
20048001
www.national.com
1 page  
Typical Characteristics
Transmitter Output High Voltage vs. Load Capacitance
Transmitter Slew Rate vs. Load Capacitance
20048002
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 VS 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.
The −10V is then stored in capacitor C4.
ELECTROSTATIC DISCHARGE PROTECTION
ESD protection has been placed at all pins to protect the
device from ESD. All pins except for the transmitter output
pins (pins 7 and 14) and receiver input pins (pins 8 and 13)
have a ESD rating of 2kV Human Body Model (HBM) and
200V Machine Model (MM). The RS-232 bus pins (pins 7, 8,
13 and 14) have a more robust ESD protection. The RS-232
bus pins have a ESD rating of 15kV HBM and IEC 1000-4-2,
air-gap. In addition the bus pins meet an ESD rating of 8kV
with IEC 1000-4-2, contact. The ESD structures can with-
stand a high ESD event under the following conditions:
powered-on, powered-off, and Input connected to high and
low with outputs unloaded.
HUMAN BODY MODEL
The Human Body Model is an ESD testing standard, defined
in Mil-STD-883C method 3015.7. It simulates a human dis-
charging an ESD charge to the IC device. The rise time is
approximately 10 ns and decay time is approximately 150
ns. The waveform is obtained by discharging 2kV volts ca-
20048003
pacitor through a resistor, R2 = 1.5 kΩ. The peak current is
approximately 1.33A.
20048004
FIGURE 1. HBM ESD Test Model
FIGURE 2. HBM Waveform
20048005
5 www.national.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LMS202E.PDF ] | |
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