stc或者是51单片机的RS232例程，有收也有发，还有电路图

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19 RS232通讯.rar （55个子文件）

19 RS232通讯

RS232

232接收程序

STARTUP.LST 11KB

int.hex 180B

mainfun.LST 5KB

int.M51 4KB

STARTUP.A51 5KB

int_Opt.Bak 1007B

int.plg 186B

232.OBJ 2KB

int.lnp 54B

STARTUP.OBJ 749B

int.Opt 1008B

mainfun.OBJ 3KB

int_Uv2.Bak 2KB

232.c 2KB

int 3KB

int.Uv2 2KB

232.LST 3KB

232发送程序

STARTUP.LST 11KB

int.hex 437B

mainfun.LST 5KB

int.M51 5KB

STARTUP.A51 5KB

int_Opt.Bak 1KB

int.plg 186B

232.OBJ 3KB

int.lnp 54B

STARTUP.OBJ 749B

int.Opt 1KB

mainfun.OBJ 3KB

int_Uv2.Bak 2KB

232.c 2KB

int 3KB

int.Uv2 2KB

232.LST 4KB

232接收与发送程序

STARTUP.LST 11KB

int.hex 279B

mainfun.LST 5KB

int.M51 5KB

STARTUP.A51 5KB

int_Opt.Bak 1010B

int.plg 192B

232.OBJ 2KB

int.lnp 54B

STARTUP.OBJ 749B

int.Opt 1008B

mainfun.OBJ 3KB

int_Uv2.Bak 2KB

232.c 2KB

int 3KB

int.Uv2 2KB

232.LST 4KB

串口电路图.jpg 104KB

datasheet-相关芯片手册

MAX232.pdf 442KB

max485.pdf 161KB

PL2303.pdf 149KB

General Description

The MAX220–MAX249 family of line drivers/receivers is

intended for all EIA/TIA-232E and V.28/V.24 communica-

tions interfaces, particularly applications where ±12V is

not available.

These parts are especially useful in battery-powered sys-

tems, since their low-power shutdown mode reduces

power dissipation to less than 5µW. The MAX225,

MAX233, MAX235, and MAX245/MAX246/MAX247 use

no external components and are recommended for appli-

cations where printed circuit board space is critical.

________________________Applications

Portable Computers

Low-Power Modems

Interface Translation

Battery-Powered RS-232 Systems

Multidrop RS-232 Networks

____________________________Features

Superior to Bipolar

♦ Operate from Single +5V Power Supply

(+5V and +12V—MAX231/MAX239)

♦ Low-Power Receive Mode in Shutdown

(MAX223/MAX242)

♦ Meet All EIA/TIA-232E and V.28 Specifications

♦ Multiple Drivers and Receivers

♦ 3-State Driver and Receiver Outputs

♦ Open-Line Detection (MAX243)

Ordering Information

Ordering Information continued at end of data sheet.

*Contact factory for dice specifications.

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

________________________________________________________________ Maxim Integrated Products 1

Selection Table

19-4323; Rev 10; 8/01

PART

MAX220CPE

MAX220CSE

MAX220CWE 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

16 Wide SO

MAX220C/D 0°C to +70°C Dice*

MAX220EPE

MAX220ESE

MAX220EWE -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 16 Plastic DIP

16 Narrow SO

16 Wide SO

MAX220EJE -40°C to +85°C 16 CERDIP

MAX220MJE -55°C to +125°C 16 CERDIP

Power No. of Nominal SHDN Rx

Part Supply RS-232 No. of Cap. Value & Three- Active in Data Rate

Number (V) Drivers/Rx Ext. Caps (µF) State SHDN (kbps) Features

MAX220 +5 2/2 4 0.1 No — 120 Ultra-low-power, industry-standard pinout

MAX222 +5 2/2 4 0.1 Yes — 200 Low-power shutdown

MAX223 (MAX213) +5 4/5 4 1.0 (0.1) Yes ✔ 120 MAX241 and receivers active in shutdown

MAX225 +5 5/5 0 — Yes ✔ 120 Available in SO

MAX230 (MAX200) +5 5/0 4 1.0 (0.1) Yes — 120 5 drivers with shutdown

MAX231 (MAX201) +5 and 2/2 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;

+7.5 to +13.2 same functions as MAX232

MAX232 (MAX202) +5 2/2 4 1.0 (0.1) No — 120 (64) Industry standard

MAX232A +5 2/2 4 0.1 No — 200 Higher slew rate, small caps

MAX233 (MAX203) +5 2/2 0 — No — 120 No external caps

MAX233A +5 2/2 0 — No — 200 No external caps, high slew rate

MAX234 (MAX204) +5 4/0 4 1.0 (0.1) No — 120 Replaces 1488

MAX235 (MAX205) +5 5/5 0 — Yes — 120 No external caps

MAX236 (MAX206) +5 4/3 4 1.0 (0.1) Yes — 120 Shutdown, three state

MAX237 (MAX207) +5 5/3 4 1.0 (0.1) No — 120 Complements IBM PC serial port

MAX238 (MAX208) +5 4/4 4 1.0 (0.1) No — 120 Replaces 1488 and 1489

MAX239 (MAX209) +5 and 3/5 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;

+7.5 to +13.2 single-package solution for IBM PC serial port

MAX240 +5 5/5 4 1.0 Yes — 120 DIP or flatpack package

MAX241 (MAX211) +5 4/5 4 1.0 (0.1) Yes — 120 Complete IBM PC serial port

MAX242 +5 2/2 4 0.1 Yes ✔ 200 Separate shutdown and enable

MAX243 +5 2/2 4 0.1 No — 200 Open-line detection simplifies cabling

MAX244 +5 8/10 4 1.0 No — 120 High slew rate

MAX245 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, two shutdown modes

MAX246 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, three shutdown modes

MAX247 +5 8/9 0 — Yes ✔ 120 High slew rate, int. caps, nine operating modes

MAX248 +5 8/8 4 1.0 Yes ✔ 120 High slew rate, selective half-chip enables

MAX249 +5 6/10 4 1.0 Yes ✔ 120 Available in quad flatpack package

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243

ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243

= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T

= T

MIN

to T

MAX

‚ unless otherwise noted.)

Note 1: Input voltage measured with T

OUT

in high-impedance state, SHDN or V

= 0V.

Note 2: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (V

) ...............................................-0.3V to +6V

Input Voltages

..............................................................-0.3V to (V

- 0.3V)

(Except MAX220) ........................................................±30V

(MAX220).....................................................................±25V

OUT

(Except MAX220) (Note 1) .......................................±15V

OUT

(MAX220)...............................................................±13.2V

Output Voltages

OUT

...................................................................................±15V

OUT

.........................................................-0.3V to (V

+ 0.3V)

Driver/Receiver Output Short Circuited to GND.........Continuous

Continuous Power Dissipation (T

= +70°C)

16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW

18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW

20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW

16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW

16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW

18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW

20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW

20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW

16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW

18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW

Operating Temperature Ranges

MAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C

MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C

MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

1.4 0.8Input Logic Threshold Low

UNITSMIN TYP MAXPARAMETER CONDITIONS

Input Logic Threshold High

All devices except MAX220 2 1.4

All except MAX220, normal operation 540

Logic Pull-Up/lnput Current

SHDN = 0V, MAX222/242, shutdown, MAX220

±0.01 ±1

µA

= 5.5V, SHDN = 0V, V

OUT

= ±15V, MAX222/242

±0.01 ±10

Output Leakage Current

= SHDN = 0V, V

OUT

= ±15V

±0.01 ±10

µA

200 116Data Rate kb/s

Transmitter Output Resistance V

= V+ = V- = 0V, V

OUT

= ±2V 300 10M Ω

Output Short-Circuit Current V

OUT

= 0V ±7 ±22 mA

RS-232 Input Voltage Operating Range ±30 V

All except MAX243 R2

0.8 1.3

RS-232 Input Threshold Low V

= 5V

MAX243 R2

(Note 2) -3

All except MAX243 R2

1.8 2.4

RS-232 Input Threshold High V

= 5V

MAX243 R2

(Note 2) -0.5 -0.1

All except MAX243, V

= 5V, no hysteresis in shdn. 0.2 0.5 1

RS-232 Input Hysteresis

MAX243 1

RS-232 Input Resistance 357kΩ

TTL/CMOS Output Voltage Low I

OUT

= 3.2mA 0.2 0.4 V

TTL/CMOS Output Voltage High I

OUT

= -1.0mA 3.5 V

- 0.2 V

Sourcing V

OUT

= GND -2 -10

mATTL/CMOS Output Short-Circuit Current

Shrinking V

OUT

= V

10 30

V±5 ±8Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND

RS-232 TRANSMITTERS

RS-232 RECEIVERS

2.4MAX220: V

= 5.0V

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

_______________________________________________________________________________________ 3

Note 3: MAX243 R2

OUT

is guaranteed to be low when R2

is ≥ 0V or is floating.

ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)

= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T

= T

MIN

to T

MAX

‚ unless otherwise noted.)

Operating Supply Voltage

SHDN Threshold High

4.5 5.5 V

MAX222/242

Transmitter-Output Enable Time

(SHDN goes high), Figure 4

2.0 1.4 V

MAX220 0.5 2

No load

MAX222/232A/233A/242/243 410

MAX222/232A/233A/242/243 61230

MAX220 12

Supply Current (SHDN = V

Figures 5, 6, 11, 19

3kΩ load

both inputs

MAX222/232A/233A/242/243 15

Transition Slew Rate

= +25°C 0.1 10

= 50pF to 2500pF,

= 3kΩ to 7kΩ,

= 5V, T

= +25°C,

measured from +3V

to -3V or -3V to +3V

= 0°C to +70°C

CONDITIONS

250

MAX220 1.5 3 30

V/µs

= -40°C to +85°C 250

MAX222/242, 0.1µF caps

(includes charge-pump start-up)

Shutdown Supply Current MAX222/242

= -55°C to +125°C 35 100

µA

SHDN Input Leakage Current

MAX222/242 ±1 µA

SHDN Threshold Low

MAX222/242 1.4 0.8 V

250

MAX222/232A/233A/242/243 1.3 3.5

µs

PHLT

MAX220 410

Transmitter-Output Disable Time

(SHDN goes low), Figure 4

MAX222/232A/233A/242/243 1.5 3.5

Transmitter Propagation Delay

TLL to RS-232 (normal operation),

Figure 1

PLHT

MAX220 510

µs

V2.0 1.4

MAX222/242, 0.1µF caps

µA±0.05 ±10

600

TTL/CMOS Output Leakage Current

EN Input Threshold High

MAX222/232A/233A/242/243 0.5 1

PHLR

MAX220 0.6 3

PLHR

MAX222/232A/233A/242/243 0.6 1

Receiver Propagation Delay

RS-232 to TLL (normal operation),

Figure 2

PHLT

- t

PLHT

MAX220 0.8 3

µs

MAX222/232A/233A/242/243

PHLS

MAX242 0.5 10

Receiver Propagation Delay

RS-232 to TLL (shutdown), Figure 2

PLHS

MAX242 2.5 10

µs

Receiver-Output Enable Time, Figure 3 t

MAX242

UNITSMIN TYP MAX

125 500

PARAMETER

MAX242

SHDN = V

or EN = V

(SHDN = 0V for MAX222),

0V ≤ V

OUT

≤ V

Receiver-Output Disable Time, Figure 3 t

MAX242 160 500 ns

300

Transmitter + to - Propagation

Delay Difference (normal operation)

MAX220 2000

PHLR

- t

PLHR

MAX222/232A/233A/242/243 100

Receiver + to - Propagation

Delay Difference (normal operation)

MAX220 225

V1.4 0.8

EN Input Threshold Low

MAX242

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243

-10

0 5 15 25

OUTPUT VOLTAGE vs. LOAD CURRENT

-4

-6

-8

-2

MAX220-01

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

0.1µF

EITHER V+ OR V- LOADED

= ±5V

NO LOAD ON

TRANSMITTER OUTPUTS

(EXCEPT MAX220, MAX233A)

V- LOADED, NO LOAD ON V+

V+ LOADED, NO LOAD ON V-

1µF

0.1µF

010 40 60

AVAILABLE OUTPUT CURRENT

vs. DATA RATE

MAX220-02

DATA RATE (kbits/sec)

OUTPUT CURRENT (mA)

20 30 50

OUTPUT LOAD CURRENT

FLOWS FROM V+ TO V-

= +5.25V

ALL CAPS

1µF

ALL CAPS

0.1µF

= +4.75V

+10V

-10V

MAX222/MAX242

ON-TIME EXITING SHUTDOWN

+5V

MAX220-03

500µs/div

V+, V- VOLTAGE (V)

1µF CAPS

V+

V-

SHDN

0.1µF CAPS

1µF CAPS

0.1µF CAPS

MAX220–MAX249

+5V-Powered, Multichannel RS-232

Drivers/Receivers

_______________________________________________________________________________________ 5

...........................................................................-0.3V to +6V

V+ ................................................................(V

- 0.3V) to +14V

V- ............................................................................+0.3V to -14V

Input Voltages

............................................................-0.3V to (V

+ 0.3V)

......................................................................................±30V

Output Voltages

OUT

...................................................(V+ + 0.3V) to (V- - 0.3V)

OUT

.........................................................-0.3V to (V

+ 0.3V)

Short-Circuit Duration, T

OUT

......................................Continuous

Continuous Power Dissipation (T

= +70°C)

14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW

16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW

20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW

24-Pin Narrow Plastic DIP

(derate 13.33mW/°C above +70°C) ..........1.07W

24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW

16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW

20-Pin Wide SO (derate 10 00mW/°C above +70°C).......800mW

24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW

28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W

44-Pin Plastic FP (derate 11.11mW/°C above +70°C) .....889mW

14-Pin CERDIP (derate 9.09mW/°C above +70°C) ..........727mW

16-Pin CERDIP (derate 10.00mW/°C above +70°C) ........800mW

20-Pin CERDIP (derate 11.11mW/°C above +70°C) ........889mW

24-Pin Narrow CERDIP

(derate 12.50mW/°C above +70°C) ..............1W

24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W

28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW

Operating Temperature Ranges

MAX2 _ _ C _ _......................................................0°C to +70°C

MAX2 _ _ E _ _...................................................-40°C to +85°C

MAX2 _ _ M _ _ ...............................................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

ABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241

ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241

(MAX223/230/232/234/236/237/238/240/241, V

= +5V ±10; MAX233/MAX235, V

= 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,

= 5V ±10%; V+ = 7.5V to 13.2V; T

= T

MIN

to T

MAX

; unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

CONDITIONS

MIN TYP MAX

UNITS

Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±7.3 V

Power-Supply Current

No load,

= +25°C

510

mA715

0.4 1

V+ Power-Supply Current

1.8 5

515

Shutdown Supply Current T

= +25°C

15 50

VInput Logic Threshold High

2.0

EN, SHDN (MAX223);

EN, SHDN (MAX230/235/236/240/241)

2.4

Logic Pull-Up Current T

=0V 1.5 200

Receiver Input Voltage

Operating Range

-30 30 V

µA

110

VInput Logic Threshold Low

; EN, SHDN (MAX233); EN, SHDN (MAX230/235–241)

0.8

MAX231/239

MAX223/230/234–238/240/241

MAX232/233

PARAMETER

MAX239

MAX230/235/236/240/241

MAX231

MAX223

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2013-10-30

谢谢，有用的资料

stc或者是51单片机的RS232例程，有收也有发，还有电路图

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