Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS232 1/1 uMAX 8

General Description

The MAX3314E is a ±5V-powered EIA/TIA-232-compat-

ible 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 provid-

ing 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 sup-

ply 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

RIN

TOUTTIN

GND

V-

ROUT

SOT23/µMAX/SO

TOP VIEW

MAX3314E

SHDN

Pin Configuration

BYPASS

0.1µF

SHDN

V-

TOUT

RIN

TIN

ROUT

GND

5kΩ

+5V

MAX3314E

CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.

0.1µF

-5V

Typical Operating Circuit

19-1696; Rev 1; 3/01

Ordering Information

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

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.

Summary of content (8 pages)

PAGE 1
9-1696; Rev 1; 3/01 ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver 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.
PAGE 2
MAX3314E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver ABSOLUTE MAXIMUM RATINGS VCC to 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....................................
PAGE 3
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E TIMING CHARACTERISTICS (VCC = +5V, V- = -5V, TA = TMIN to TMAX. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN RL = 3kΩ, CL = 1000pF, transmitter switching Maximum Data Rate TYP UNITS 460 kbps tPLH Receiver input to receiver output, CL = 150pF 0.15 tPHL Receiver input to receiver output, CL = 150pF 0.
PAGE 4
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E Pin Description PIN NAME FUNCTION 1 VCC 2 SHDN Shutdown, Active low (0 = off, 1 = on). 3 ROUT TTL/CMOS Receiver Output 4 TIN TTL/CMOS Transmitter Input 5 TOUT 6 RIN 7 V- 8 GND +5V ±5% External Power Supply. Decouple with a 0.1µF capacitor to ground. RS-232-Compatible Transmitter Output RS-232-Compatible Receiver Input -5V ±5% External Power Supply. Decouple with a 0.1µF capacitor to ground.
PAGE 5
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E Table 1. Shutdown Logic Truth Table SHDN TRANSMITTER OUTPUT RECEIVER OUTPUT L High Z Active H Active Active TIN TOUT ROUT 5V/div 0 SHDN TIN = GND 5µs/div 1.5V/div 0 Figure 3. Loopback Test Result at 120kbps TOUT TIN = VCC TIN 1µs/div Figure 1. Transmitter Outputs When Exiting Shutdown or Powering Up TOUT +5V ROUT 0.1µF VCC SHDN MAX3314E 2µs/div -5V V- Figure 4. Loopback Test Result at 250kbps 0.
PAGE 6
MAX3314E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50MΩ to 100MΩ RD 1500Ω CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7. IEC 1000-4-2 ESD Test Model Figure 5.
PAGE 7
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver SOT23, 8L.EPS 8LUMAXD.
PAGE 8
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver SOICN.EPS MAX3314E Package Information (continued) 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.