MAXIM MAX3386E Technical data

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General Description

The MAX3386E 3V-powered EIA/TIA-232 and V.28/V.24
is a communications interface with low power require­ments, high data-rate capabilities, and enhanced elec­trostatic discharge (ESD) protection. The MAX3386E
has 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.

A proprietary low-dropout transmitter output stage
enables true RS-232 performance from a +3.0V to +5.5V
supply with a dual charge pump. The charge pump
requires only four small 0.1µF capacitors for operation
from a +3.3V supply. The MAX3386E is capable of
running at data rates up to 250kbps while maintaining
RS-232 compliant output levels.

The MAX3386E has a unique VLpin that allows interop­eration in mixed-logic voltage systems. Both input and
output logic levels are pin programmable through the
VLpin. The MAX3386E is available in a space-saving
TSSOP package.

Applications

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

Features

♦ VLPin for Compatibility with Mixed-Voltage

Systems

♦ ±15kV ESD Protection on Rx Inputs and Tx Outputs
♦ Low 300µA Supply Current
♦ Guaranteed 250kbps Data Rate
♦ 1µA Low-Power Shutdown
♦ Meets EIA/TIA-232 Specifications Down to 3.0V

MAX3386E

3.0V, ±15kV ESD-Protected RS-232

Transceiver for PDAs and Cell Phones

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuit

19-1529; Rev 1; 10/99

PART

MAX3386ECUP
MAX3386EEUP -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 TSSOP
20 TSSOP

Pin Configuration

Ordering Information

TOP VIEW

C1+

C1-

C2-

T1IN

T3IN

1

2

V+

3

4

MAX3386E

5

6

V-

7

8

9

10

20

SHDN

19

V

CC

18

GND

17

T1OUTC2+

16

T2OUT

15

T3OUT

14

R1IN

13

R2INT2IN

12

V

L

11

R1OUTR2OUT

+3.3V

C

BYPASS

C1

0.1µF

C2

0.1µF

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

20

SHDN

1

C1+

3

C1-

4

C2+

5

C2-

7

T1IN

T2IN

8

T3IN

9

11

R1OUT

R2OUT10

MAX3386E

19

V

GND

12

V

CC

L

2

V+

V-

T1OUT

T2OUT

T3OUT

V

L

R1IN

V

18

5k

L

R2IN

5k

C3

0.1µF

6

C4

0.1µF

17

RS-232

16

OUTPUTS

15

14

RS-232
INPUTS

13

TSSOP

I

OUT

= -1mA

MAX3386E

3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA=
T

MIN

to T

MAX

; unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +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 to GND ...........................................-0.3V to +6V

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

Output Voltages

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

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

L

+ 0.3V)

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

Continuous Power Dissipation (T

A

= +70°C)

20-Pin TSSOP (derate 7.0mW/°C above +70°C) .......559mW

Operating Temperature Ranges

MAX3386ECUP.................................................0°C to +70°C

MAX3386EEUP ..............................................-40°C to +85°C

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

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

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

I

OUT

= 1.6mA

R_OUT, receivers disabled

T_IN, SHDN

T_IN, SHDN

SHDN = GND, all inputs at VCCor GND
SHDN = VCC, no load

CONDITIONS

V0.4Output Voltage Low

µA±0.05 ±10Output Leakage Currents

µA±0.01 ±1Input Leakage Current

V0.5Transmitter Input Hysteresis

V

0.9

Input Logic Threshold High

1.4

2.0

2.4

V

0.8

110µAShutdown Supply Current

mA0.3 1Supply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

VL= 5.0V
VL= 3.3V
VL= 2.5V
VL= 1.8V

I

OUT

= -1mA V

VL- VL-

0.6 0.1

Output Voltage High

VL= 3.3V or 5.0V

T_IN, SHDN

0.6

Input Logic Threshold Low

VL= 2.5V

V-25 +25Input Voltage Range

TA= +25°C V

0.8 1.2

Input Threshold Low

0.6 1.5

VL= 5.0V
VL= 2.5V or 3.3V

TA= +25°C V

1.8 2.4

Input Threshold High

1.5 2.4

VL= 5.0V
VL= 2.5V or 3.3V

V0.5Input Hysteresis

357TA= +25°C kΩInput Resistance

DC CHARACTERISTICS (VCC= +3.3V or +5V, TA= +25°C)

LOGIC INPUTS

RECEIVER OUTPUTS

RECEIVER INPUTS

MAX3386E

3.0V, ±15kV ESD-Protected RS-232

Transceiver for PDAs and Cell Phones

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA=
T

MIN

to T

MAX

; unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°C.)

TIMING CHARACTERISTICS

(VCC= VL= +3V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA= T

MIN

to T

MAX

; unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°C.)

IEC 1000-4-2 Air-Gap Discharge method

Human Body Model

V

T_OUT

= ±12V, transmitters disabled;

VCC= 0 or 3.0V to 5.5V

V

T_OUT

= 0

VCC= V+ = V- = 0, transmitter output = ±2V

All transmitter outputs loaded with 3kΩ to
ground

CONDITIONS

±15

±15

µA±25Output Leakage Current

mA±60Output Short-Circuit Current

Ω300 10MOutput Resistance

V±5 ±5.4Output Voltage Swing

UNITSMIN TYP MAXSYMBOLPARAMETER

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

(Note 2)



V

T_OUT



> 3.7V

Receiver input to receiver output,
C

L

= 150pF

CONDITIONS

630

ns50



t

PHL

- t

PLH



Receiver Skew

ns100



t

PHL

- t

PLH



Transmitter Skew

µs100Time to Exit Shutdown

ns200Receiver Output Disable Time

ns200Receiver Output Enable Time

µs

0.15t

PLH

Receiver Propagation Delay

kbps250Maximum Data Rate

0.15t

PHL

UNITSMIN TYP MAXSYMBOLPARAMETER

IEC 1000-4-2 Contact Discharge method

kV

±8

R_IN, T_OUT
ESD Protection

VCC= 3.3V,
TA= +25°C,
RL= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V

V/µs

430

Transition-Region Slew
Rate

CL= 150pF to
1000pF

CL= 150pF to
2500pF

Note 2: Transmitter skew is measured at the transmitter zero crosspoint.

RECEIVER INPUTSTRANSMITTER OUTPUTS

ESD PROTECTION

MAX3386E

3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)

-7.5

-5.0

-2.5

0

2.5

5.0

7.5

0 1000 2000 3000 4000 5000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3386E toc 01

LOAD CAPACITANCE (pF)

OUTPUT VOLTAGE (V)

DATA RATE = 250kbps
LOAD = 3kΩ IN PARALLEL WITH C

L

0

2

4

6

8

10

12

14

16

0 1000 2000 3000 4000 5000

SLEW RATE vs. LOAD CAPACITANCE

MAX3386E toc 02

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

SLEW RATE +

SLEW RATE -

-7.5

-5.0

-2.5

0

2.5

5.0

7.5

0 50 100 150 200 250

TRANSMITTER OUTPUT VOLTAGE

vs. DATA RATE

MAX3386E toc 03

DATA RATE (kbps)

OUTPUT VOLTAGE (V)

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

0

10

20

30

40

50

60

0 1000 2000 3000 4000 5000

SUPPLY CURRENT vs. LOAD CAPACITANCE

MAX3386E toc 04

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

250kbps

120kbps

20kbps

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