MAXIM MAX3314E User Manual

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General Description

The MAX3314E is a ±5V-powered EIA/TIA-232-compat­ible interface. It has one transmitter and one receiver in
a flow-through architecture. The transmitter output and
the receiver input are protected to ±15kV using IEC
1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2
Contact Discharge, and ±15kV using the Human Body
Model.

The transmitter has a low-dropout output stage provid­ing minimum RS-232-compatible ±3.7V output levels
while driving 3kΩ and 1000pF at 460kbps. Both +5V
and -5V must be supplied externally.

The MAX3314E has a SHDN function that reduces sup­ply current to 1µA. The transmitter is disabled and put
into tristate while the receiver remains active.

The MAX3314E is available in 8-pin µMAX, SOT23, and
SO packages.

________________________Applications

Digital Cameras
PDAs
GPS
POS
Telecommunications
Handy-Terminals
Set-Top Boxes

Features

♦ ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge

♦ 1µA Low-Power Shutdown with Receiver Active

♦ 30µA Operating Supply Current

♦ 460kbps Guaranteed Data Rate

♦ 8-Pin SOT23 Package

♦ ±3.7V RS-232-Compatible Levels

MAX3314E

±15kV ESD-Protected, 460kbps, 1µA,

RS-232-Compatible Transceiver

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

C

BYPASS

0.1µF

2

7

1

8

5

6

4

3

SHDN

V-

TOUT

RIN

TIN

ROUT

V

CC

GND

5kΩ

+5V

MAX3314E

CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.

0.1µF

-5V

Typical Operating Circuit

19-1696; Rev 1; 3/01

Ordering Information

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.

PART TEMP. RANGE PIN-PACKAGE

MAX3314ECKA-T 0°C to +70°C 8 SOT23-8
MAX3314ECUA 0°C to +70°C 8 µMAX
MAX3314ECSA 0°C to +70°C 8 SO
MAX3314EEKA-T -40°C to +85°C 8 SOT23-8
MAX3314EEUA -40°C to +85°C 8 µMAX

MAX3314EESA -40°C to +85°C 8 SO

TOP VIEW

1

V

CC

2

SHDN

ROUT

MAX3314E

3

4

SOT23/µMAX/SO

87GND

V-

RIN

6

TOUTTIN

5

MAX3314E

±15kV ESD-Protected, 460kbps, 1µA,
RS-232-Compatible Transceiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

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

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

Input Voltages

TIN, SHDN to GND ...............................................-0.3V to +6V

RIN to GND ......................................................................±25V

Output Voltages

TOUT to GND................................................................±13.2V

ROUT .................................................…-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration

TOUT to GND .........................................................Continuous

Continuous Power Dissipation

8-Pin SOT23 (derate 9.7mW/°C above +70°C)...........777mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) ............300mW

8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW

Operating Temperature Ranges

MAX3314EC_A ..................................................0°C to +70°C

MAX3314EE_A................................................-40°C to +85°C

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

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

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

ELECTRICAL CHARACTERISTICS

(VCC= +5V, V- = -5V, TA= T

MIN

to T

MAX

. Typical values are at TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
P osi ti ve S up p l y Op er ati ng Rang e V

4.75 5 5.25 V

CC

N egati ve S up p l y O p er ating Range V- -4.75 -5 -5.25 V
Positive Supply Current SHDN = V
Negative Supply Current SHDN = V

, no load 30 100 µA

CC

, no load 15 30 µA

CC

Shutdown Supply Current SHDN = GND 1 10 µA
LOGIC INPUTS (TIN, SHDN)
Input Logic Threshold Low V
Input Logic Threshold High V

0.8 V

IL

2.4 V

IH

Transmitter Input Hysteresis 0.5 V
Input Leakage Current ±0.01 µA
RECEIVER OUTPUT
Output Voltage Low V

Output Voltage High V

OL

OH

I

= 1.6mA 0.4 V

OUT

I

= -1.0mA

OUT

RECEIVER INPUT
Input Threshold Low V
Input Threshold High V

0.8 V

IL

2.4 V

IH

Input Hysteresis 0.5 V
Input Resistance 5 kΩ
TRANSMITTER OUTPUT
Output Voltage Swing Tr ansm i tter outp ut l oad ed w i th 3kΩ to g r ound ±3.7 V
Output Resistance (Note 1) V

= V- = 0, transmitter output = ±2V 300 Ω

CC

Output Short-Circuit Current ±60 mA
Output Leakage Current V

= ±12V, transmitter disabled 25 µA

OUT

ESD PROTECTION (Transmitter Output, Receiver Input)

Human Body Model ±15

ESD-Protection Voltage

IEC 1000-4-2 Air-Gap Discharge ±15

IEC 1000-4-2 Contact Discharge ±8

V

- 0.3

CC

V

CC

- 0.1

V

kV

MAX3314E

±15kV ESD-Protected, 460kbps, 1µA,

RS-232-Compatible Transceiver

_______________________________________________________________________________________ 3

Note 1: Not tested, guaranteed by design.

TIMING CHARACTERISTICS

(VCC= +5V, V- = -5V, TA= T

MIN

to T

MAX

. Typical values are at TA= +25°C.)

Typical Operating Characteristics

(VCC= +5V, V- = -5V, 250kbps data rate, transmitter loaded with 3kΩ and CL, TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate

Receiver Propagation Delay

Transmitter Skew 100 ns

Receiver Skew

Transition Region Slew Rate

R

= 3kΩ, C

L

switching

t

PLH

t

PHL

Receiver input to receiver output,

= 150pF

C

L

Receiver input to receiver output,

= 150pF

C

L

50 ns

RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF,

measured from +3V to -3V or -3V to +3V

= 1000pF, transmitter

L

460

0.15

0.15

8 V/µs

kbps

µs

SLEW RATE vs. LOAD CAPACITANCE

9

8

7

6

5

4

SLEW RATE (V/µs)

3

2

1

0

0 1000500 1500 2000 2500 3000

-SLEW

+SLEW

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE

6

5

MAX3314E-01

4
3

20kbps/120kbps

2
1
0

-1

-2

-3

-4

TRANSMITTER OUTPUT VOLTAGE (V)

-5

-6
500

0 1000 1500 2000 2500 3000

vs. LOAD CAPACITANCE

460kbps/250kbps

20kbps/120kbps

LOAD CAPACITANCE (pF)

460kbps/250kbps

MAX3314E-02

SUPPLY CURRENT (mA)

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

0 500 1000 1500 2000 2500 3000

SUPPLY CURRENT

vs. LOAD CAPACITANCE

250kbps

LOAD CAPACITANCE (pF)

460kbps

MAX3314E-03

120kbps

20kbps