MAX3389ECUG+ [MAXIM]

Line Transceiver, 2 Func, 3 Driver, 2 Rcvr, PDSO24, 4.40 MM, 0.65 MM PITCH, TSSOP-24;


型号：	MAX3389ECUG+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Line Transceiver, 2 Func, 3 Driver, 2 Rcvr, PDSO24, 4.40 MM, 0.65 MM PITCH, TSSOP-24 驱动光电二极管接口集成电路驱动器
文件：	总11页 (文件大小：288K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-1845; Rev 1; 9/01

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

General Description

Features

The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA-

232 and V.28/V.24 communications interfaces with low

power requirements, high data-rate capabilities, and

enhanced electrostatic discharge (ESD) protection. The

MAX3388E/MAX3389E have two receivers and three

transmitters. All RS-232 inputs and outputs are protected

to ±±5ꢀV using the IEꢁ ±111-4-2 Air-ꢂap Discharge

method, ±8ꢀV using the IEꢁ ±111-4-2 ꢁontact Discharge

method, and ±±5ꢀV using the ꢃuman ꢄodꢅ Model.

ꢀ V Pin for Compatibility with Mixed-Voltage

Systems

ꢀ Additional I/O for Hot-Sync Applications

ꢀ ±±15V ꢀSꢁ Protection on ꢂx Inpꢃtsꢄ ꢅx Oꢃtpꢃtsꢄ

LINꢄ and SWIN

ꢀ Low 300µA Sꢃpply Cꢃrrent

ꢀ Gꢃaranteed 4605bps ꢁata ꢂate

ꢀ ±µA Low-Power Shꢃtdown

In addition to the traditional RS-232 I/O, these devices have

dedicated logic-level I/O pins for additional device-to-

device handshaꢀing. During shutdown the logic-level I/O

pins are active for the MAX3389E. An internal 62Ω switch is

provided to switch power to external circuitrꢅ or modules.

ꢀ Integrated Switch for Powering ꢂemote Circꢃitry

ꢀ Flow-ꢅhroꢃgh Pinoꢃt

ꢀ L

Active ꢁꢃring Shꢃtdown (MAX3389ꢀ)

OUꢅ

A proprietarꢅ low-dropout transmitter output stage

enables RS-232 compatible performance from a +2.35V

to +3.1V supplꢅ with a dual charge pump. The charge

pump requires onlꢅ four small 1.±µF capacitors for oper-

ation from a +2.5V supplꢅ. The MAX3388E/MAX3389E

are capable of running at data rates up to 461ꢀbps while

maintaining RS-232-compatible output levels.

Applications

Subnotebooꢀ/Palmtop ꢁomputers

PDAs and PDA ꢁradles

ꢁell Phone Data ꢁables

ꢄatterꢅ-Powered Equipment

ꢃand-ꢃeld Equipment

Peripherals

The MAX3388E/MAX3389E have a unique V pin that

allows interoperation in mixed-logic voltage sꢅstems.

ꢄoth input and output logic levels are pin programma-

ble through the V pin. The MAX3388E/MAX3389E are

Ordering Information

available in a space-saving TSSOP pacꢀage.

PAꢂꢅ

ꢅꢀMP. ꢂANGꢀ

1°ꢁ to +71°ꢁ

-41°ꢁ to +85°ꢁ

1°ꢁ to +71°ꢁ

-41°ꢁ to +85°ꢁ

PIN-PACKAGꢀ

24 TSSOP

Typical Operating Circuit

MAX3388ꢀꢁUꢂ

MAX3388EEUꢂ

MAX3389ꢀꢁUꢂ

MAX3389EEUꢂ

24 TSSOP

+2.5V

24 TSSOP

BYPASS

SHDN

C1+

24 TSSOP

V+

V-

0.1µF

C1-

C2+

MAX3388E

MAX3389E

-in Configuration

0.1µF

C2-

T1OUT

T1IN

TOP VIEW

C1+

V+

24 SHDN

T2IN

T3IN

T2OUT

T3OUT

C1-

C2+

C2-

V-

22 GND

21 T1OUT

20 T2OUT

19 T3OUT

18 R1IN

17 R2IN

16 LIN

RS-232

I/O

13 R1OUT

R1IN

5kΩ

R2IN

MAX3388E

MAX3389E

12 R2OUT

10 LOUT

T1IN

T2IN

T3IN

5kΩ

LIN

30kΩ

SHDN

LOUT 10

15 SWIN

SWOUT 11

R2OUT 12

SWIN

SWOUT

GND

15kV ESD PROTECTION

13 R1OUT

ꢅSSOP

________________________________________________________________ Maxim Integrated Products

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.

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

ABSOLUꢅꢀ MAXIMUM ꢂAꢅINGS

ꢁꢁ

to ꢂND..............................................................-1.3V to +6V

Short-ꢁircuit Duration T_OUT to ꢂND........................ꢁontinuous

V to ꢂND...................................................-1.3V to (V

+ 1.3V)

ꢁontinuous Power Dissipation (T = +71°ꢁ)

24-Pin TSSOP (derate ±2.2mW/°ꢁ above +71°ꢁ) ........975mW

Operating Temperature Ranges

MAX338_EꢁUꢂ ...................................................1°ꢁ to +71°ꢁ

MAX338_EEUꢂ.................................................-41°ꢁ to +85°ꢁ

Junction Temperature......................................................+±51°ꢁ

Storage Temperature Range.............................-65°ꢁ to +±51°ꢁ

Lead Temperature (soldering, ±1s) .................................+311°ꢁ

ꢁꢁ

V+ to ꢂND................................................................-1.3V to +7V

V- to ꢂND .................................................................+1.3V to -7V

V+ +V-(Note ±) ............................................................... +±3V

Input Voltages

T_IN, SHDN, LIN to ꢂND.......................................-1.3V to +6V

R_IN to ꢂND .....................................................................±25V

SWIN to ꢂND...........................................-1.3V to (V + 1.3V)

ꢁꢁ

Output Voltages

T_OUT to ꢂND...............................................................±±3.2V

R_OUT, SWOUT, LOUT to ꢂND ................-1.3V to (V + 1.3V)

Note ±: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed ±3V.

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.

ꢁC ꢀLꢀCꢅꢂICAL CHAꢂACꢅꢀꢂISꢅICS

= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T

to T

, unless otherwise noted. Tꢅpical values are at V = V = +2.5V,

ꢁꢁ L

ꢁꢁ

MIN

MAX

= +25°ꢁ.)

PAꢂAMꢀꢅꢀꢂ

SYMBOL

= +2.5V, T = +25°ꢁ)

CONꢁIꢅIONS

MIN

ꢅYP

MAX

UNIꢅS

ꢁC CHAꢂACꢅꢀꢂISꢅICS (V

Shutdown Supplꢅ ꢁurrent

Supplꢅ ꢁurrent

ꢁꢁ

±1

µA

SHDN = ꢂND, all inputs at ꢂND

SHDN = V , no load

1.3

ꢁꢁ

LOGIC INPUꢅS (T_IN, SHDN)

Input Logic Low

V = +2.5V

1.6

±±

Input Logic ꢃigh

V = +2.5V

±.5

Transmitter Input ꢃꢅsteresis

Input Leaꢀage ꢁurrent

ꢂꢀCꢀIVꢀꢂ OUꢅPUꢅS

Output Leaꢀage ꢁurrent

Output Voltage Low

1.4

±1.1±

µA

±1.15

±±1

1.4

µA

R_OUT, SHDN = 1

= ±.6mA

OUT

V -

1.6

V -

1.±3

Output Voltage ꢃigh

= -±mA

OUT

ꢂꢀCꢀIVꢀꢂ INPUꢅS

Input Voltage Range

Input Threshold Low

Input Threshold ꢃigh

Input ꢃꢅsteresis

-25

1.6

+25

2.4

= +25°ꢁ, V = +2.5V

±.±

±.8

1.7

= +25°ꢁ, V = +2.5V

Input Resistance

= +25°ꢁ

ꢀΩ

ꢅꢂANSMIꢅꢅꢀꢂ OUꢅPUꢅS

All transmitter outputs loaded with 3ꢀΩ to

Output Voltage Swing

±3.7

311

±4.2

±1M

ground

Output Resistance

= 1, transmitter output = ±2V

Ω

ꢁꢁ

Output Short-ꢁircuit ꢁurrent

= 1

±61

T_OUT

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

ꢁC ꢀLꢀCꢅꢂICAL CHAꢂACꢅꢀꢂISꢅICS (continꢃed)

= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T

to T

, unless otherwise noted. Tꢅpical values are at V = V = +2.5V,

ꢁꢁ L

ꢁꢁ

MIN

MAX

= +25°ꢁ.)

PAꢂAMꢀꢅꢀꢂ

SYMBOL

CONꢁIꢅIONS

= ±±1Vꢀ tranꢁsmtterꢁ ꢂmꢁaꢃbeꢂꢀ

MIN

ꢅYP

MAX

±15

UNIꢅS

T_OUT

Output Leakage Current

µA

= 0 or +1.5V

HANꢁSHAKING I/O (LINꢄ LOUꢅ)

Input Vobtage Range

Input Threꢁhobꢂ Low

Input Threꢁhobꢂ Hmgh

Input Hyꢁtereꢁmꢁ

LINꢀ V = +1.5Vꢀ T = +15°C

0.6

±.±

±.7

0.6

LINꢀ V = +1.5Vꢀ T = +15°C

Input Reꢁmꢁtance

= +15^oC

0.4

±0

kΩ

Output Vobtage Low

Output Leakage Current

SWIꢅCH (SWINꢄ SWOUꢅ)

Input Vobtage Range

On-Reꢁmꢁtance

LOUTꢀ I

= ±.6sA

SINK

LOUT = V ꢀ LIN = bow or fboat

µA

Ω

±00

Off-Leakage Current

Turn-On Tmse

SHDN = 0

µA

µꢁ

0.±8

0.7

Turn-Off Tmse

ꢀSꢁ PꢂOꢅꢀCꢅION

Husan Boꢂy Moꢂeb

±±5

±8

R_INꢀ T_OUTꢀ LINꢀ SWIN

ESD Protectmon

IEC ±000-4-1 Amr-Gap Dmꢁcharge sethoꢂ

IEC ±000-4-1 Contact Dmꢁcharge sethoꢂ

ꢅIMING CHAꢂACꢅꢀꢂISꢅICS

ꢁꢁ

= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T

to T , unless otherwise noted. Tꢅpical values are at V = V = +2.5V,

MAX ꢁꢁ L

MIN

T = +25°ꢁ.)

PAꢂAMꢀꢅꢀꢂ

SYMBOL

CONꢁIꢅIONS

R = 3ꢀΩ, ꢁ = ±111pF,

MIN

ꢅYP

MAX

UNIꢅS

251

one transmitter switching

Maximum Data Rate

ꢀbps

R = 3kΩꢀ C = ±50pFꢀ

- t

PꢃL PLꢃ



460

one tranꢁsmtter ꢁwmtchmng (Note 1)

1.±5

211

PꢃL

Receiver input to receiver output,

ꢁ = ±51pF

Receiver Propagation Delaꢅ

µs

PLꢃ

Receiver Output Enable Time

Receiver Output Disable Time

Time to Exit Shutdown

Transmitter Sꢀew

µs

V > 3.7V

T_OUT



- t

R = 3ꢀΩ, ꢁ = ±111pF (Note 3)

±11

PꢃL PLꢃ



Receiver Sꢀew

- t

PHL PLH

= +2.5V, T = +25°ꢁ,

ꢁꢁ

ꢁ = ±51pF to

±111pF

R = 3ꢀΩ to 7ꢀΩ,

Transition-Region Slew

Rate

measured from +3V

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

one transmitter switching

V/µs

ꢁ = ±51pF to

2511pF

Note 2: ꢂuaranteed bꢅ correlation.

Note 3: Transmitter sꢀew is measured at the transmitter zero crosspoint.

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

Typical Operating Characteristics

= V = +1.5Vꢀ T = +15°Cꢀ unbeꢁꢁ otherwmꢁe noteꢂ.)

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

SLEW RATE vs. LOAD CAPACITANCE

5.0

2.5

SLEW RATE -

DATA RATE = 460kbps

LOAD = 3kΩ IN PARALLEL

SLEW RATE +

-2.5

-5.0

1000

2000

3000

4000

5000

1000

2000

3000

4000

5000

LOAD CAPACITANCE (pF)

SUPPLY CURRENT

vs. LOAD CAPACITANCE

TRANSMITTER OUTPUT VOLTAGE

vs. DATA RATE

5.0

2.5

LOAD = 3kΩ

ONE TRANSMITTER SWITCHING

AT DATA RATE, OTHER

TRANSMITTERS AT 1/8

DATA RATE

460kbps

240kbps

LOAD = 3kΩ, 1000pF

ONE TRANSMITTER SWITCHING

AT DATA RATE, OTHER

TRANSMITTERS AT 1/8

DATA RATE

-2.5

-5.0

20kbps

150 200 250

1000

2000

3000

4000

5000

50 100

300 350 400 450

LOAD CAPACITANCE (pF)

DATA RATE (kbps)

ON-RESISTANCE

vs. SWIN VOLTAGE

LIN TO LOUT t

= +85°C

LIN

= +25°C

1V/div

LOUT

= -40°C

= 1kΩ

PULLUP

200ns/div

0.5

1.0

1.5

(V)

2.0

2.5

SWIN

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

-in Description

NAMꢀ

FUNCꢅION

Poꢁmtmve Tersmnab of the Vobtage-Douꢃber Charge-Pusp Capacmtor

+4.1V Suppby Generateꢂ ꢃy the Charge Pusp

C±+

V+

C±-

C1+

C1-

V-

Negatmve Tersmnab of the Vobtage-Douꢃber Charge-Pusp Capacmtor

Poꢁmtmve Tersmnab of the Invertmng Charge-Pusp Capacmtor

Negatmve Tersmnab of the Invertmng Charge-Pusp Capacmtor

-4.1V Suppby Generateꢂ ꢃy the Charge Pusp

T±INꢀ

T1INꢀ T3IN

7ꢀ 8ꢀ 9

CMOS Tranꢁsmtter Inputꢁ

±0

±±

LOUT

Hanꢂꢁhakmng Output. Thmꢁ output mꢁ actmve ꢂurmng ꢁhutꢂown for the MAX3389E.

Swmtch Output

SWOUT

R1OUTꢀ

R±OUT

±1ꢀ ±3

CMOS Recemver Outputꢁ. Swmng ꢃetween 0 anꢂ V .

±4

±5

±6

Logmc-Leveb Suppby. Abb CMOS mnputꢁ anꢂ outputꢁ are referreꢂ to thmꢁ ꢁuppby. V = +±.8V to +3.0V.

SWIN

LIN

Swmtch Input.

Hanꢂꢁhakmng Input. Thmꢁ mnput mꢁ actmve ꢂurmng ꢁhutꢂown for the MAX3389E.

R1INꢀ

R±IN

±7ꢀ ±8

RS-131 Recemver Inputꢁ

T3OUTꢀ

T1OUTꢀ

T±OUT

±9ꢀ 10ꢀ 1±

RS-131 Tranꢁsmtter Outputꢁ

GND

Grounꢂ

+1.35V to +3V Suppby Vobtage

SHDN

Shutꢂown Input. 0 = ꢁhutꢂownꢀ ꢁwmtch open; ± = norsab operatmonꢀ ꢁwmtch cboꢁeꢂ.

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

ꢅable ±. Shꢃtdown Logic ꢅrꢃth ꢅable

LOUꢅ

ꢅꢂANSMIꢅꢅꢀꢂ

OUꢅPUꢅS

ꢂꢀCꢀIVꢀꢂ

OUꢅPUꢅS

CHAꢂGꢀ

PUMP

SHDN

SWIꢅCH

MAX3388ꢀ

MAX3389ꢀ

LIN

Hmgh-Z

Actmve

Hmgh-Z

Actmve

Inactmve

Actmve

Open

Hmgh-Z

Cboꢁeꢂ

LIN

POWER-

MANAGEMENT

UNIT OR

KEYBOARD

CONTROLLER

5V/div

2V/div

SHDN

I/O CHIP

POWER SUPPLY

MAX3388E

MAX3389E

= +2.5V

C1–C4 = 0.1µF

C = 1000pF, R = 3kΩ

I/O

CHIP

WITH

UART

RS-232

10µs/div

CPU

Figure 2. Transmitter Outputs when Exiting Shutdown

The MAX3388E/MAX3389E’ꢁ tranꢁsmtterꢁ guarantee a

150kꢃpꢁ ꢂata rate wmth boaꢂꢁ of 3kΩ mn parabbeb wmth

±000pF anꢂ 460kꢃpꢁ ꢂata rate wmth boaꢂꢁ of 3kΩ mn parab-

beb wmth ±50pF. Fmgure ± ꢁhowꢁ a cospbete ꢁyꢁtes con-

nectmon.

Figure 1. Interface Under Control of PMU

Detailed Description

Theꢁe RS-131 output ꢁtageꢁ are turneꢂ off (hmgh

mspeꢂance) when the ꢂevmceꢁ are mn ꢁhutꢂown soꢂe.

When the power mꢁ offꢀ the MAX3388E/MAX3389E persmt

the outputꢁ to ꢃe ꢂrmven up to ±±1V.

Dual Chargeꢂ-ump

Voltage Converter

The MAX3388E/MAX3389E’ꢁ mnternab power ꢁuppby

conꢁmꢁtꢁ of a regubateꢂ ꢂuab charge pusp that provmꢂeꢁ

output vobtageꢁ of +4.1V (ꢂouꢃbmng charge pusp) anꢂ -

4.1V (mnvertmng charge pusp)ꢀ regarꢂbeꢁꢁ of the mnput

The tranꢁsmtter mnputꢁ ꢂo not have pubbup reꢁmꢁtorꢁ.

Connect unuꢁeꢂ mnputꢁ to GND or V .

Rꢁꢂ232 Receivers

vobtage (V ) over a +1.5V to +3.0V range. The charge

The recemverꢁ convert RS-131 ꢁmgnabꢁ to CMOS-bogmc

output bevebꢁ. The MAX3388E/MAX3389E’ꢁ recemverꢁ

have mnvertmng outputꢁ. The outputꢁ are hmgh mspeꢂ-

ance mn ꢁhutꢂown.

puspꢁ operate mn a ꢂmꢁcontmnuouꢁ soꢂe: mf the output

vobtageꢁ are beꢁꢁ than 4.1Vꢀ the charge puspꢁ are

enaꢃbeꢂ; mf the output vobtageꢁ exceeꢂ 4.1Vꢀ the charge

puspꢁ are ꢂmꢁaꢃbeꢂ. Each charge pusp requmreꢁ fbymng

capacmtorꢁ (C±ꢀ C1) anꢂ reꢁervomr capacmtorꢁ (C3ꢀ C4)

to generate the V+ anꢂ V- ꢁuppbmeꢁ.

ꢁhutdown Mode

Suppby current fabbꢁ to beꢁꢁ than ±µA when the

MAX3388E/MAX3389E are pbaceꢂ mn ꢁhutꢂown soꢂe

(SHDN bogmc bow). When ꢁhut ꢂownꢀ the ꢂevmce’ꢁ charge

puspꢁ are turneꢂ offꢀ V+ ꢂecayꢁ to V ꢀ V- mꢁ pubbeꢂ to

grounꢂꢀ the ꢁwmtch mꢁ openeꢂꢀ anꢂ the tranꢁsmtter outputꢁ

are ꢂmꢁaꢃbeꢂ (hmgh mspeꢂance). The tmse requmreꢂ to exmt

Rꢁꢂ232 Transmitters

The tranꢁsmtterꢁ are mnvertmng beveb tranꢁbatorꢁ that convert

CMOS-bogmc bevebꢁ to ±3.7V EIA/TIA-131-cospatmꢃbe

bevebꢁ.

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

ꢁhutꢂown mꢁ typmcabby 30µꢁꢀ aꢁ ꢁhown mn Fmgure 1.

Connect SHDN to V mf the ꢁhutꢂown soꢂe mꢁ not uꢁeꢂ.

In ꢁhutꢂown soꢂeꢀ the recemver outputꢁ are hmgh mspeꢂ-

1MΩ

1500Ω

ance (Taꢃbe ±).

DISCHARGE

RESISTANCE

CHARGE-CURRENT

LIMIT RESISTOR

V Logic ꢁupply Input

Unbmke other RS-131 mnterface ꢂevmceꢁ where the recemver

HIGH-

VOLTAGE

DEVICE

UNDER

TEST

outputꢁ ꢁwmng ꢃetween 0 anꢂ V ꢀ the MAX3388E/

STORAGE

CAPACITOR

MAX3389E feature a ꢁeparate bogmc ꢁuppby mnput (V )

100pF

that ꢁetꢁ V

for the recemver outputꢁ anꢂ ꢁetꢁ threꢁh-

SOURCE

obꢂꢁ for the tranꢁsmtter mnputꢁ. Thmꢁ feature abbowꢁ a

great ꢂeab of fbexmꢃmbmty mn mnterfacmng to sany ꢂmfferent

typeꢁ of ꢁyꢁtesꢁ wmth ꢂmfferent bogmc bevebꢁ. Connect

thmꢁ mnput to the hoꢁt bogmc ꢁuppby (±.8V ≤ V ≤ V ).

Abꢁo ꢁee the Typical PDA/Cell-Phone Application ꢁec-

tmon.

Figure 3a. Human Body ESD Test Model

±±5ꢀV EꢁD -rotection

Aꢁ wmth abb Maxms ꢂevmceꢁꢀ ESD-protectmon ꢁtructureꢁ are

mncorporateꢂ on abb pmnꢁ to protect agamnꢁt ESDꢁ encoun-

tereꢂ ꢂurmng hanꢂbmng anꢂ aꢁꢁesꢃby. The MAX3388E/

MAX3389E’ꢁ ꢂrmver outputꢁꢀ recemver mnputꢁꢀ the hanꢂ-

ꢁhakmng mnput LINꢀ anꢂ the ꢁwmtch tersmnab SWIN have

extra protectmon agamnꢁt ꢁtatmc ebectrmcmty. Maxms haꢁ

ꢂevebopeꢂ ꢁtate-of-the-art ꢁtructureꢁ to protect theꢁe pmnꢁ

agamnꢁt an ESD of ±±5kV wmthout ꢂasage. The ESD

ꢁtructureꢁ wmthꢁtanꢂ hmgh ESD mn abb ꢁtateꢁ: norsab opera-

tmonꢀ ꢁhutꢂownꢀ anꢂ powereꢂ ꢂown. After an ESD eventꢀ

Maxms’ꢁ “E” verꢁmon ꢂevmceꢁ keep workmng wmthout

batchupꢀ whereaꢁ cospetmng RS-131 proꢂuctꢁ can batch

anꢂ suꢁt ꢃe powereꢂ ꢂown to resove batchup. ESD pro-

tectmon can ꢃe teꢁteꢂ mn varmouꢁ wayꢁ. The tranꢁsmtter out-

putꢁ anꢂ recemver mnputꢁ of thmꢁ proꢂuct fasmby are

charactermzeꢂ for protectmon to the fobbowmng bmsmtꢁ:

100%

90%

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

AMPERES

36.8%

10%

TIME

CURRENT WAVEFORM

Figure 3b. Human Body Current Waveform

±) ±±5kV uꢁmng the Husan Boꢂy Moꢂeb

1) ±8kV uꢁmng the Contact Dmꢁcharge sethoꢂ ꢁpecmfmeꢂ

mn IEC ±000-4-1

IEC ±000ꢂ4ꢂ2

The IEC ±000-4-1 ꢁtanꢂarꢂ coverꢁ ESD teꢁtmng anꢂ

perforsance of fmnmꢁheꢂ equmpsent; mt ꢂoeꢁ not ꢁpecmfm-

cabby refer to ICꢁ. The MAX3388E/MAX3389E hebpꢁ you

ꢂeꢁmgn equmpsent that seetꢁ Leveb 4 (the hmgheꢁt beveb)

of IEC ±000-4-1ꢀ wmthout the neeꢂ for aꢂꢂmtmonab ESD-

protectmon cosponentꢁ.

3) ±±5kV uꢁmng IEC ±000-4-1’ꢁ Amr-Gap Dmꢁcharge

sethoꢂ

EꢁD Test Conditions

ESD perforsance ꢂepenꢂꢁ on a varmety of conꢂmtmonꢁ.

Contact Maxms for a rebmaꢃmbmty report that ꢂocusentꢁ

teꢁt ꢁetupꢀ sethoꢂobogyꢀ anꢂ reꢁubtꢁ.

The sajor ꢂmfference ꢃetween teꢁtꢁ ꢂone uꢁmng the

Husan Boꢂy Moꢂeb anꢂ IEC ±000-4-1 mꢁ hmgher peak

current mn IEC ±000-4-1ꢀ ꢃecauꢁe ꢁermeꢁ reꢁmꢁtance mꢁ

bower mn the IEC ±000-4-1 soꢂeb. Henceꢀ the ESD wmth-

ꢁtanꢂ vobtage seaꢁureꢂ to IEC ±000-4-1 mꢁ generabby

bower than that seaꢁureꢂ uꢁmng the Husan Boꢂy

Moꢂeb. Fmgure 4a ꢁhowꢁ the IEC ±000-4-1 soꢂebꢀ anꢂ

Fmgure 4ꢃ ꢁhowꢁ the current wavefors for the ±8kV IEC

±000-4-1 Leveb 4 ESD Contact Dmꢁcharge teꢁt.

Human Body Model

Fmgure 3a ꢁhowꢁ the Husan Boꢂy Moꢂebꢀ anꢂ Fmgure 3ꢃ

ꢁhowꢁ the current wavefors mt generateꢁ when ꢂmꢁ-

chargeꢂ mnto a bow mspeꢂance. Thmꢁ soꢂeb conꢁmꢁtꢁ of

a ±00pF capacmtor chargeꢂ to the ESD vobtage of mntereꢁtꢀ

whmch mꢁ then ꢂmꢁchargeꢂ mnto the teꢁt ꢂevmce through a

±.5kΩ reꢁmꢁtor.

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

The Amr-Gap teꢁt mnvobveꢁ approachmng the ꢂevmce wmth a

chargeꢂ proꢃe. The contact ꢂmꢁcharge sethoꢂ connectꢁ

the proꢃe to the ꢂevmce ꢃefore the proꢃe mꢁ energmzeꢂ.

330Ω

50MΩ to 100MΩ

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

Machine Model

The Machmne Moꢂeb for ESD teꢁtꢁ abb pmnꢁ uꢁmng a

100pF ꢁtorage capacmtor anꢂ zero ꢂmꢁcharge reꢁmꢁ-

tance. Itꢁ oꢃjectmve mꢁ to esubate the ꢁtreꢁꢁ cauꢁeꢂ ꢃy

contact that occurꢁ wmth hanꢂbmng anꢂ aꢁꢁesꢃby ꢂurmng

sanufacturmng. Abb pmnꢁ requmre thmꢁ protectmon ꢂurmng

sanufacturmngꢀ not juꢁt RS-131 mnputꢁ anꢂ outputꢁ.

Thereforeꢀ after PC ꢃoarꢂ aꢁꢁesꢃbyꢀ the Machmne

Moꢂeb mꢁ beꢁꢁ rebevant to I/O portꢁ.

HIGH-

VOLTAGE

DEVICE

UNDER

TEST

150pF

STORAGE

CAPACITOR

SOURCE

__________Applications Information

Figure 4a. IEC 1000-4-2 ESD Test Model

Capacitor ꢁelection

The capacmtor type uꢁeꢂ for C±–C4 mꢁ not crmtmcab for

proper operatmon; pobarmzeꢂ or nonpobarmzeꢂ capacmtorꢁ

can ꢃe uꢁeꢂ. The charge pusp requmreꢁ 0.±µF capacmtorꢁ

for 1.5V operatmon (Taꢃbe 1). Do not uꢁe vabueꢁ ꢁsabber

than thoꢁe bmꢁteꢂ mn Taꢃbe 1. Increaꢁmng the capacmtor

vabueꢁ (e.g.ꢀ ꢃy a factor of 1) reꢂuceꢁ rmppbe on the

tranꢁsmtter outputꢁ anꢂ ꢁbmghtby reꢂuceꢁ power con-

ꢁusptmon. C1ꢀ C3ꢀ anꢂ C4 can ꢃe mncreaꢁeꢂ wmthout

changmng C±’ꢁ vabue. Howeverꢀ ꢂo not mncreaꢁe C±

wmthout abꢁo mncreaꢁmng the vabueꢁ of C1ꢀ C3ꢀ anꢂ C4 to

samntamn the proper ratmoꢁ (C± to the other capacmtorꢁ).

100%

90%

When uꢁmng the smnmsus requmreꢂ capacmtor vabueꢁꢀ

sake ꢁure the capacmtor vabue ꢂoeꢁ not ꢂegraꢂe

exceꢁꢁmveby wmth tesperature. If mn ꢂouꢃtꢀ uꢁe capacmtorꢁ

wmth a barger nosmnab vabue. The capacmtor’ꢁ equmvabent

ꢁermeꢁ reꢁmꢁtance (ESR)ꢀ whmch uꢁuabby rmꢁeꢁ at bow tes-

peratureꢁꢀ mnfbuenceꢁ the asount of rmppbe on V+ anꢂ V-.

10%

= 0.7ns to 1ns

30ns

60ns

-owerꢂꢁupply Decoupling

In soꢁt cmrcusꢁtanceꢁꢀ a 0.±µF ꢃypaꢁꢁ capacmtor mꢁ

aꢂequate. In appbmcatmonꢁ that are ꢁenꢁmtmve to power-

ꢁuppby nomꢁeꢀ ꢂecoupbe V to grounꢂ wmth a capacmtor of

Figure 4b. IEC 1000-4-2 ESD Generator Current Waveform

the ꢁase vabue aꢁ charge-pusp capacmtor C±. Connect

ꢃypaꢁꢁ capacmtorꢁ aꢁ cboꢁe to the IC aꢁ poꢁꢁmꢃbe.

Transmitter Outputs when

Exiting ꢁhutdown

ꢅable 2. Minimꢃm ꢂeqꢃired Capacitor

Valꢃes

Fmgure 1 ꢁhowꢁ two tranꢁsmtter outputꢁ when exmtmng

ꢁhutꢂown soꢂe. Aꢁ they ꢃecose actmveꢀ the two

tranꢁsmtter outputꢁ are ꢁhown gomng to oppoꢁmte RS-131

bevebꢁ (one tranꢁsmtter mnput mꢁ hmgh; the other mꢁ bow).

Each tranꢁsmtter mꢁ boaꢂeꢂ wmth 3kΩ mn parabbeb wmth

±000pF. The tranꢁsmtter outputꢁ ꢂmꢁpbay no rmngmng or

unꢂeꢁmraꢃbe tranꢁmentꢁ aꢁ they cose out of ꢁhutꢂown.

Note that the tranꢁsmtterꢁ are enaꢃbeꢂ onby when the

sagnmtuꢂe of V- exceeꢂꢁ approxmsateby 1.5V.

(V)

C±–C4

(µF)

1.5 to 3.0

0.±

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

High Data Rates

The MAX3388E/MAX3389E samntamn RS-131-cospatmꢃbe

tranꢁsmtter output vobtageꢁ even at hmgh ꢂata rateꢁ. Fmgure

5 ꢁhowꢁ a tranꢁsmtter boopꢃack teꢁt cmrcumt. Fmgure 6 ꢁhowꢁ

a boopꢃack teꢁt reꢁubt at 150kꢃpꢁꢀ anꢂ Fmgure 7 ꢁhowꢁ the

ꢁase teꢁt at 460kꢃpꢁ. For Fmgure 6ꢀ abb tranꢁsmtterꢁ were

ꢂrmven ꢁmsubtaneouꢁby at 150kꢃpꢁ mnto RS-131 boaꢂꢁ mn

parabbeb wmth ±000pF. For Fmgure 7ꢀ a ꢁmngbe tranꢁsmtter waꢁ

ꢂrmven at 460kꢃpꢁꢀ anꢂ abb tranꢁsmtterꢁ were boaꢂeꢂ wmth

an RS-131 recemver mn parabbeb wmth ±50pF.

0.1µF

C1+

V+

V-

MAX3388E

MAX3389E

C1-

C2+

-ower ꢁwitch

The MAX3388E/MAX3389E contamn an mnternab ꢁwmtch

for powermng externab cmrcumtry. Thmꢁ can ꢃe uꢁeꢂ to

power hot-ꢁync cmrcumtry or other bow-power cmrcumtry.

The ꢁwmtch on- reꢁmꢁtance mꢁ typmcabby 61Ω. The SWIN

ꢁmꢂe of the ꢁwmtch mꢁ ESD protecteꢂ to ±±5kV.

C2-

T_ OUT

T_ IN

LogicꢂLevel I/O

In aꢂꢂmtmon to the traꢂmtmonab RS-131 I/Oꢀ the

MAX3388E/MAX3389E have a bogmc-beveb tranꢁcemver

fros the RS-131 connector ꢁmꢂe to the CMOS-bogmc

ꢁmꢂe. The mnput mspeꢂance mꢁ typmcabby 30kΩꢀ anꢂ the

output mꢁ open ꢂramn. The bogmc beveb I/O mꢁ actmve ꢂurmng

ꢁhutꢂown for the MAX3389E.

Thmꢁ I/O tranꢁcemver mꢁ uꢁefub for hot ꢁyncmng or other

ꢂeꢂmcateꢂ cossunmcatmon capaꢃmbmty. The mnput mꢁ ESD

protecteꢂ to ±±5kV.

R_ IN

R_ OUT

SHDN

5kΩ

GND

Typical -DA/Cellꢂ-hone Application

The MAX3388E/MAX3389E ꢂeꢁmgneꢂ wmth PDA appbmca-

tmonꢁ mn smnꢂ. Two tranꢁsmtterꢁ anꢂ two recemverꢁ hanꢂbe

ꢁtanꢂarꢂ fubb-ꢂupbex cossunmcatmon protocobꢀ whmbe an

extra tranꢁsmtter abbowꢁ a rmng mnꢂmcator (RI) ꢁmgnab to abert

the UART on the PC. Wmthout the rmng mnꢂmcator tranꢁsmt-

terꢀ ꢁobutmonꢁ for theꢁe appbmcatmonꢁ woubꢂ requmre ꢁoft-

ware-mntenꢁmve pobbmng of the craꢂbe mnputꢁ.

The RI ꢁmgnab mꢁ generateꢂ when a PDAꢀ cebbubar phoneꢀ or

other “craꢂbeꢂ” ꢂevmce mꢁ pbuggeꢂ mnto mtꢁ craꢂbe. Thmꢁ

generateꢁ a bogmc-bow ꢁmgnab to RI tranꢁsmtter mnputꢀ creat-

mng +3.7V at the rmng mnꢂmcate pmn. The PC’ꢁ UART RI mnput

mꢁ the onby pmn that can generate an mnterrupt fros ꢁmgnabꢁ

arrmvmng through the RS-131 port. The mnterrupt routmne for

thmꢁ UART wmbb then ꢁervmce the RS-131 fubb-ꢂupbex cos-

sunmcatmon ꢃetween the PDA anꢂ the PC.

Figure 5. Loopback Test Circuit

2V/div

5V/div

T1IN

T1OUT

R1OUT

5V/div

Aꢁ cebb phone ꢂeꢁmgn ꢃecoseꢁ sore bmke that of PDAꢁꢀ

cebb phoneꢁ wmbb requmre ꢁmsmbar ꢂockmng aꢃmbmty anꢂ cos-

sunmcatmon protocob. Cebb phoneꢁ operate on a ꢁmngbe

bmthmus-mon (Lm+) ꢃattery anꢂ generate a regubateꢂ out-

put vobtage of +1.35V to +3V fros the phone connector.

The ꢃaꢁeꢃanꢂ bogmc cosmng fros the phone connector

can ꢃe aꢁ bow aꢁ ±.8V at the tranꢁcemverꢁ. To prevent

forwarꢂ ꢃmaꢁmng of a ꢂevmce mnternab to the cebb phoneꢀ

the MAX3388E/MAX3389E cose wmth a bogmc power-

C = 1000pF

1µs/div

Figure 6. Loopback Test Results at 250kbps

ꢁuppby pmn (V ) that bmsmtꢁ the bogmc bevebꢁ preꢁenteꢂ to

_______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

the phone. The recemver outputꢁ wmbb ꢁmnk to zero for bow

outputꢁꢀ ꢃut wmbb not exceeꢂ V for bogmc hmghꢁ. The

mnput bogmc bevebꢁ for the tranꢁsmtterꢁ are abꢁo abtereꢂꢀ

ꢁcabeꢂ ꢃy the sagnmtuꢂe of the V mnput. The ꢂevmceꢁ

2V/div

5V/div

T1IN

wmbb work wmth V aꢁ bow aꢁ ±.8V. Thmꢁ mꢁ uꢁefub wmth cebb

phoneꢁ anꢂ other power-effmcment ꢂevmceꢁ wmth core

bogmc vobtage bevebꢁ that go aꢁ bow aꢁ ±.8V.

T1OUT

Chip Information

TRANSISTOR COUNT: ±313

R1OUT

5V/div

C = 150pF

1µs/div

Figure 7. Loopback Test Results at 460kbps

±0 ______________________________________________________________________________________

2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232

Transceivers for -DAs and Cell -hones

-acꢀage Information

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated -roducts, ±20 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600_____________________±±

Prmnteꢂ USA

mꢁ a regmꢁtereꢂ traꢂesark of Maxms Integrateꢂ Proꢂuctꢁ.

MAX3389ECUG+ [MAXIM]

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