LMS202ECMX [NSC]

15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers; 15KV ESD额定5V单电源TIA / EIA- 232双收发器


型号：	LMS202ECMX
厂家：	National Semiconductor
描述：	15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers 15KV ESD额定5V单电源TIA / EIA- 232双收发器
文件：	总8页 (文件大小：138K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

March 2003

LMS202E

15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual

Transceivers

General Description

Features

n ESD protection for RS-232 I/O pins

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.

—

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

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.

n On-board DC-to-DC converter

n 0.1µF charge pump capacitors

n Drop-in replacement to Maxim’s MAX202E

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.

Applications

n POS equipment (Bar code reader)

n Hand-held equipment

n General purpose RS-232 communication

Connection Diagram and Typical Circuit

20048001

DS200480

www.national.com

Pin Descriptions

Pin Number

Pin Name

C1+, C1−

V+

Pin Function

1, 3

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

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

GND

V_S

Power supply pin for the device, +5V ( 10%)

Ordering Information

Package

Part Number

Package Marking

LMS202ECM

Transport Media

48 Units/Rail

NSC Drawing

M16A

LMS202ECM

LMS202ECMX

LMS202EIM

2.5k Units Tape and Reel

48 Units/Rail

16-Pin SOIC

LMS202EIM

LMS202ECMW

LMS202EIMW

LMS202EIMX

LMS202ECMW

LMS202ECMWX

LMS202EIMW

LMS202EIMWX

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

www.national.com

Absolute Maximum Ratings (Note 1)

(Note 9)

2kV

ESD Rating (MM)

Soldering Information

Infrared or Convection

(20sec.)

200V (Note 6) (Note 9)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

235˚C

V_S

−0.3V to 6V

(V_S− 0.3V) to + 14V

+0.3V to −14V

V+

Junction Temperature

Storage Temperature Range

150˚C

V−

−65˚C to +150˚C

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

−0.3V to (V+ +0.3V)

30V

Operating Ratings

(V− −0.3V to (V+ + 0.3V)

−0.3 to (V_S+ 0.3)

Continuous

Supply Voltage V_S

Ambient Temperature Range, T_A

Commercial (C)

Industrial (I)

4.5V to 5.5V

0˚C to +70˚C

−40˚C to +85˚C

IEC 1000-4-2) (Note 7)

(Note 8)

Package Thermal Resistance

(Note 3)

Air-Gap Discharge

Contact Discharge

Human Body Model (Note 2)

(Note 8)

15kV

8kV

71˚C/W

55˚C/W

WSO

15kV

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)

DC Characteristics

I_S

Supply Current

No Load, T_A= 25˚C

Logic

I_INPUT

V_THL

V_THH

V_OL

Input Leakage Current

T_IN= 0V to V_S

µA

Input Logic Theshold Low

Input Logic Theshold High

T_IN

0.8

2.0

3.5

TTL/CMOS Output Voltage R_OUT, I_OUT= 3.2mA

0.4

Low

V_OH

TTL/CMOS Output Voltage R_OUT, I_OUT= −1.0mA

High

V_S−0.1

RS-232 Receiver Inputs

V_RI

Receiver Input Voltage

−30

0.8

+30

2.4

Range

V_RTHL

V_RTHH

Receiver Input Theshold

Low

V_S= 5V, T_A= 25˚C

1.4

Receiver Input Theshold

High

V_HYST

R_I

Receiver Input Hysteresis

Receiver Input Resistance

V_S= 5V

0.2

0.6

1.0

V_S= 5V, T_A= 25˚C

kΩ

RS-232 Transmitter Outputs

V_O

R_O

I_OS

Transmitter Output Voltage All transmitters loaded with 3kΩ to GND

Swing

Ω

Output Resistance

V_S= V+ = V− = 0V,

V_O2V

300

Output Short Circuit Current

kbps

Timing Characteristics

DR Maximum Data Rate

C_L= 50pF to 1000pF,

230

R_L= 3kΩ to 7kΩ

www.national.com

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)

Typ

0.08

2.4

Max

(Note 5)

Units

T_RPLH

Receiver Propagation Delay C_L= 150pF

µs

T_RPHL

T_DPLH

T_DPHL

V_SLEW

Transmitter Propagation

Delay

R_L= 3kΩ, C_L= 2500pF

All transmitters loaded

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

ESD Performance: Transmitter Outputs and Receiver Inputs

V/µs

ESD Rating

Human Body Model

IEC 1000-4-2, Contact

IEC 1000-4-2, Air-gap

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

and T The maximum allowable power dissipation at any ambient temperature is P

J(MAX), JA,

− T )/ θ All numbers apply for packages soldered directly onto a PC board.

A JA.

J(MAX)

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

Note 7: IEC 1000-4-2, 330Ω in series with 150pF

Note 8: ESD rating applies to pins 7,8 13 and 14

Note 9: ESD rating applies to pins 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15 and 16

www.national.com

Typical Characteristics

Transmitter Output High Voltage vs. Load Capacitance

Transmitter Slew Rate vs. Load Capacitance

20048002

20048003

pacitor through a resistor, R2 = 1.5 kΩ. The peak current is

approximately 1.33A.

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_Sto GND. Use at least a 0.1µF capacitor or the same

size as the charge pump capacitors (C1 − C4).

CHARGED PUMP

20048004

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.

FIGURE 1. HBM ESD Test Model

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

20048005

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-

FIGURE 2. HBM Waveform

www.national.com

IEC 1000-4-2 (EN61000-4-2)

Application Information (Continued)

The European Union requires ESD immunity testing for all

electronic products as a condition for EMC Mark before

shipping to any member countries. This is not a IC require-

ment but an overall system requirement. IEC 1000-4-2

specifies ESD testing both by contact and air-gap discharge.

ESD testing by contact are generally more repeatable than

air-gap but is less realistic to actual ESD event. However,

air-gap discharge is more realistic but ESD results may vary

widely dependent on environmental conditions (temperature,

humidity,....) The waveform is obtained by discharging

150pF capacitor through a resistor, R2 = 330Ω. A typical

peak current may be high as 37A with 10kV.

MACHINE MODEL

The Machine Model is the standard ESD test method in

Japan and the automotive industry. It simulates a charge on

large object discharging through the IC device. This takes

place in automated test and handling systems. The equip-

ment can accumulate static charge due to improper ground-

ing, which is transmitted through the IC when it is picked and

placed.

The waveform is obtained by discharging 400V volts capaci-

tor to the device. Resistor, R2 = 0Ω.

The parasitic inductance, L, from the PCB affects the peak

current and period of the waveform. For L = 0.5µF, the peak

current is approximately 7A with a period of 60 ns. For L =

2.5µH, the peak current is reduced to 4A with a period of 140

ns.

20048004

FIGURE 5. IEC ESD Model

20048004

FIGURE 3. MM ESD Model

20048009

FIGURE 6. IEC Waveform

20048007

FIGURE 4. MM Waveform

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

16-Pin SOIC

NS Package Number M16A

16-Pin Wide SOIC

NS Package Number M16B

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Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

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Support Center

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Fax: +49 (0) 180-530 85 86

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Tel: 81-3-5639-7560

www.national.com

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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