MAXIM MAX3388E, MAX3389E User Manual

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General Description

The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA­232 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 ±15kV using the IEC 1000-4-2 Air-Gap Discharge
method, ±8kV using the IEC 1000-4-2 Contact Discharge
method, and ±15kV using the Human Body Model.

In addition to the traditional RS-232 I/O, these devices have
dedicated logic-level I/O pins for additional device-to­device handshaking. During shutdown the logic-level I/O
pins are active for the MAX3389E. An internal 62Ω switch is
provided to switch power to external circuitry or modules.

A proprietary low-dropout transmitter output stage
enables RS-232 compatible performance from a +2.35V
to +3.0V supply with a dual charge pump. The charge
pump requires only four small 0.1µF capacitors for oper­ation from a +2.5V supply. The MAX3388E/MAX3389E
are capable of running at data rates up to 460kbps while
maintaining RS-232-compatible output levels.

The MAX3388E/MAX3389E have a unique V

L

pin that
allows interoperation in mixed-logic voltage systems.
Both input and output logic levels are pin programma­ble through the V

L

pin. The MAX3388E/MAX3389E are

available in a space-saving TSSOP package.

Features

♦ VLPin for Compatibility with Mixed-Voltage

Systems

♦ Additional I/O for Hot-Sync Applications
♦ ±15kV ESD Protection on Rx Inputs, Tx Outputs,

LIN, and SWIN

♦ Low 300µA Supply Current
♦ Guaranteed 460kbps Data Rate
♦ 1µA Low-Power Shutdown
♦ Integrated Switch for Powering Remote Circuitry
♦ Flow-Through Pinout
♦ L

OUT

Active During Shutdown (MAX3389E)

Applications

Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals

MAX3388E/MAX3389E

2.5V, ±15kV ESD-Protected RS-232

Transceivers for PDAs and Cell Phones

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1845; Rev 1; 9/01

Pin Configuration

Ordering Information

Covered by U.S Patent numbers 4,636,930; 4,679,134;
4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761.

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.

C3

0.1µF

C4

0.1µF

RS-232
I/O

+2.5V

C

BYPASS

C1

0.1µF

C2

0.1µF

= ±15kV ESD PROTECTION

1

C1+

3

C1-

4

C2+

5

C2-

7

T1IN

T2IN

8

T3IN

9

13

R1OUT

R2OUT12

10 LOUT

11

SWOUT

24

SHDN

MAX3388E
MAX3389E

SHDN

23

V

CCVL

GND

22

14

2

V+

6

V-

T1OUT

21

T2OUT

20

T3OUT

R1IN

5kΩ

R2IN

5kΩ

30kΩ

SWIN

19

18

17

LIN

16

15

V

L

V

L

PART TEMP. RANGE PIN-PACKAGE

MAX3388ECUG

MAX3388EEUG -40°C to +85°C 24 TSSOP

MAX3389ECUG

MAX3389EEUG -40°C to +85°C 24 TSSOP

0°C to +70°C 24 TSSOP

0°C to +70°C 24 TSSOP

TOP VIEW

C1+

C1-

C2-

T1IN

T3IN

LOUT

SWOUT

1

2

V+

3

4

MAX3388E

5

MAX3389E

6

V-

7

8

9

10

11

12

24

SHDN

23

V

CC

22

GND

21

T1OUTC2+

20

T2OUT

19

T3OUT

18

R1IN

17

R2INT2IN

16

LIN

15

SWIN

14

V

L

R1OUTR2OUT

13

TSSOP

MAX3388E/MAX3389E

2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= VL= +2.5V,

T

A

= +25°C.)

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.

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

V

CC

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

V

L

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

V+ to GND ................................................................-0.3V to +7V

V- to GND .................................................................+0.3V to -7V

V+ +V-(Note 1) ............................................................... +13V

Input Voltages

T_IN, SHDN, LIN to GND.......................................-0.3V to +6V

R_IN to GND .....................................................................±25V

SWIN to GND...........................................-0.3V to (V

CC

+ 0.3V)

Output Voltages

T_OUT to GND...............................................................±13.2V

R_OUT, SWOUT, LOUT to GND ................-0.3V to (V

L

+ 0.3V)

Short-Circuit Duration T_OUT to GND........................Continuous

Continuous Power Dissipation (T

A

= +70°C)

24-Pin TSSOP (derate 12.2mW/°C above +70°C) ........975mW

Operating Temperature Ranges

MAX338_ECUG ...................................................0°C to +70°C

MAX338_EEUG.................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

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

PARAMETER

SYMBOL

Shutdown Supply Current

Supply Current

Input Logic Low

Input Logic High

Transmitter Input Hysteresis

Input Leakage Current

Output Leakage Current

Output Voltage Low

Output Voltage High

Input Voltage Range

Input Threshold Low

Input Threshold High

Input Hysteresis

Input Resistance TA= +25°C

I

OUT

= -1mA

I

OUT

= 1.6mA

R_OUT, SHDN = 0

VL= +2.5V

VL= +2.5V

SHDN = VCC, no load

SHDN = GND, all inputs at GND

CONDITIONS MIN TYP MAX

110

0.3 1

UNITS

µA

mA

0.6 V

1.5 V

0.4 V

µA±0.01 ±1

µA±0.05 ±10

0.4 V

VL- VL-

0.6 0.13

V

-25 +25 V

0.6 1.1 V

V1.8 2.4

V

kΩ

0.7

357

All transmitter outputs loaded with 3kΩ to
ground

Output Voltage Swing ±3.7 ±4.2

Output Resistance VCC= 0, transmitter output = ±2V Ω300 10M

Output Short-Circuit Current V

T_OUT

= 0 mA±60

DC CHARACTERISTICS (VCC= +2.5V, TA= +25°C)

LOGIC INPUTS (T_IN, SHDN)

RECEIVER OUTPUTS

RECEIVER INPUTS

TRANSMITTER OUTPUTS

V

TA= +25°C, VL= +2.5V

TA= +25°C, VL= +2.5V

MAX3388E/MAX3389E

2.5V, ±15kV ESD-Protected RS-232

Transceivers for PDAs and Cell Phones

_______________________________________________________________________________________ 3

TIMING CHARACTERISTICS

(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= VL= +2.5V,

T

A

= +25°C.)



t

PHL

- t

PLH



Note 2: Guaranteed by correlation.
Note 3: Transmitter skew is measured at the transmitter zero crosspoint.

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= VL= +2.5V,

T

A

= +25°C.)

PARAMETER

Maximum Data Rate

Receiver Propagation Delay

Receiver Output Enable Time

Receiver Output Disable Time

Time to Exit Shutdown

Transmitter Skew

Receiver Skew

Transition-Region Slew
Rate



t

PHL

- t

PLH



t

PLH

t

PHL

SYMBOL CONDITIONS

RL= 3kΩ, CL= 1000pF,
one transmitter switching

Receiver input to receiver output,
C

L

= 150pF



V

T_OUT



> 3.7V

RL= 3kΩ, CL= 1000pF (Note 3)

VCC= +2.5V, TA= +25°C,
RL= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V,
one transmitter switching

CL= 150pF to
1000pF

CL= 150pF to
2500pF

430

630

50

100

30

200

200

0.15

0.15

250

MIN TYP MAX UNITS

kbps

µs

ns

ns

µs

ns

ns

V/µs

RL= 3kΩ, CL= 150pF,
one transmitter switching (Note 2)

460



t

PHL

- t

PLH



Output Leakage Current

HANDSHAKING I/O (LIN, LOUT)

Input Voltage Range 0V

Input Threshold Low LIN, VL = +2.5V, TA = +25°C 0.6 1.1 V

Input Threshold High LIN, VL = +2.5V, TA = +25°C 1.7 2 V

Input Hysteresis 0.6 V

Input Resistance TA = +25oC2040kΩ

Output Voltage Low LOUT, I

Output Leakage Current LOUT = VL, LIN = low or float ±10 µA

SWITCH (SWIN, SWOUT)

Input Voltage Range 0V
On-Resistance 62 100 Ω
Off-Leakage Current SHDN = 0 ±1µA

Turn-On Time 0.18 µs

Turn-Off Time 0.7 µs

ESD PROTECTION

R_IN, T_OUT, LIN, SWIN
ESD Protection

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V
V

Human Body Model ±15

IEC 1000-4-2 Air-Gap Discharge method ±15

IEC 1000-4-2 Contact Discharge method ±8

= ±12V, transmitters disabled,

T_OUT

= 0 or +2.5V

CC

SINK

= 1.6mA 0.4 V

±25 µA

CC

CC

kV

V

V

MAX3388E/MAX3389E

2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= VL= +2.5V, TA = +25°C, unless otherwise noted.)

-5.0

-2.5

2.5

0

5.0

0 20001000 3000 4000 5000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3388E toc01

LOAD CAPACITANCE (pF)

OUTPUT VOLTAGE (V)

DATA RATE = 460kbps
LOAD = 3kΩ IN PARALLEL

0

2

4

6

8

10

12

14

16

0 1000 2000 3000 4000 5000

SLEW RATE vs. LOAD CAPACITANCE

MAX3386E toc02

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

SLEW RATE +

SLEW RATE -

-5.0

-2.5

2.5

0

5.0

0 100

150 200 250

50 300 350 400 450

TRANSMITTER OUTPUT VOLTAGE

vs. DATA RATE

MAX3388E toc03

DATA RATE (kbps)

OUTPUT VOLTAGE (V)

LOAD = 3kΩ, 1000pF
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE

0

20

10

40

30

50

60

0 20001000 3000 4000 5000

SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3388E toc04

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

LOAD = 3kΩ
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE

460kbps

240kbps

20kbps

1V/div

LOUT

LIN

R

PULLUP

LIN TO LOUT t

= 1kΩ

200ns/div

ON-RESISTANCE

PD

MAX3388E toc05

70

65

60

(Ω)

ON

R

55

50

45

0 1.00.5 1.5 2.0 2.5

vs. SWIN VOLTAGE

TA = +85°C

TA = +25°C

TA = -40°C

V

(V)

SWIN

MAX3388E toc06