Datasheet

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General Description

The MAX3380E/MAX3381E are +2.35V to +5.5V-pow-

ered EIA/TIA-232 and V.28/V.24 communication inter-

faces with low power requirements, high data-rate

capabilities, and enhanced electrostatic discharge

(ESD) protection on both the TTL and RS-232 sides.

The MAX3380E/MAX3381E have two receivers and two

transmitters. All RS-232 inputs, outputs, and logic input

pins are protected to ±15kV using IEC 1000-4-2 Air-

Gap Discharge method and the Human Body Model,

and ±8kV using IEC 1000-4-2 Contact Discharge

method.

The proprietary low-dropout transmitter output stage

enables true RS-232 performance from a +3.1V to

+5.5V supply with a dual charge pump. The parts

reduce the transmitter output levels to RS-232-compati-

ble levels with no increase in supply current for sup-

plies less than +3.1V and greater than +2.35V. The

+2.35V to +5.5V operating range is fully compatible

with lithium-ion (Li+) batteries. The charge pump

requires only four small 0.1µF capacitors for operation.

The MAX3380E/MAX3381E transceivers use Maxim’s

revolutionary AutoShutdown Plus™ feature to auto-

matically enter a 1µA shutdown mode. These

devices shut down the on-board power supply and

drivers when they do not sense a valid signal transi-

tion for 30 seconds on either the receiver or trans-

mitter inputs.

The MAX3380E is capable of transmitting data at

rates of 460kbps while maintaining RS-232 output

levels, and the MAX3381E operates at data rates up

to 250kbps. The MAX3381E offers a slower slew rate

for applications where noise and EMI are issues. The

MAX3380E/MAX3381E have a unique V

pin that

allows interoperation in mixed-logic voltage systems

down to +1.65V. Both input and output logic levels

are referenced to the V

pin. The MAX3380E/MAX3381E

are available in a space-saving TSSOP package.

Applications

Cell Phone Data Lump Cables

PDA Data Lump Cables

GPS Receivers

Digital Cameras

Features

♦ ±15kV ESD Protection on All CMOS and RS-232

Inputs and Outputs (Except INVALID)

±15kV Human Body Model

±15kV IEC 1000-4-2 Air-Gap Discharge

±8kV IEC 1000-4-2 Contact Discharge

♦ Operates Over Entire Li+ Battery Range

♦ Low Logic Threshold Down to +1.65V for

Compatibility with Cell Phone Logic Supply Voltages

♦ 1µA Low-Power AutoShutdown Plus Mode

♦ Compatible with Next-Generation GSM Data Rates

♦ 20-Pin TSSOP Package

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

________________________________________________________________ Maxim Integrated Products 1

19-2128; Rev 0; 8/01

Ordering Information

PART TEMP. RANGE

PIN-PACKAGE

MAX3380ECUP

0°C to +70°C

20 TSSOP

MAX3380EEUP

-40°C to +85°C

20 TSSOP

MAX3381ECUP

0°C to +70°C

20 TSSOP

MAX3381EEUP

-40°C to +85°C

20 TSSOP

Pin Configuration appears at end of data sheet.

MAX3380E/

MAX3381E

R2OUT

R1OUT

R2IN

GND

RS-232

OUTPUTS

TTL/CMOS

INPUTS

T2IN

T1IN

C2-

C2+

C1-

C1+

R1IN

T2OUT

T1OUT

V-

V+

0.1μF

+3.3V

RS-232

INPUTS

TTL/CMOS

OUTPUTS

5kΩ

0.1μF

FORCEON

FORCEOFF

Typical Operating Circuit

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.

AutoShutdown Plus is a trademark of Maxim Integrated Products

Summary of content (14 pages)

PAGE 1
9-2128; Rev 0; 8/01 +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins ♦ ±15kV ESD Protection on All CMOS and RS-232 Inputs and Outputs (Except INVALID) ±15kV Human Body Model ±15kV IEC 1000-4-2 Air-Gap Discharge ±8kV IEC 1000-4-2 Contact Discharge ♦ Operates Over Entire Li+ Battery Range ♦ Low Logic Threshold Down to +1.
PAGE 2
MAX3380E/MAX3381E +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins ABSOLUTE MAXIMUM RATINGS Short-Circuit Duration T_OUT to GND........................Continuous Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP (derate 10.9mW/°C over +70°C) .........879mW Operating Temperature Ranges MAX3380ECUP/MAX3381ECUP........................0°C to +70°C MAX3380EEUP/MAX3381EEUP .....................-40°C to +85°C Junction Temperature ..................................
PAGE 3
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins (VCC = +2.35V to +5.5V, VL = +1.65V to +5.5V. When VCC < +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when VCC ≥ +4.5V, C1 = 0.047µF, C2 = C3 = C4 = 0.33µF; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = VL = +3.3V, TA = +25°C.
PAGE 4
TIMING CHARACTERISTICS (VCC = +2.35V to +5.5V, VL = +1.65V to +5.5V. When VCC < +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when VCC ≥ +4.5V, C1 = 0.047µF, C2 = C3 = C4 = 0.33µF; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = VL = +3.3V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN RL = 3kΩ, CL = 1000pF, one transmitter switching Maximum Data Rate tPLH Receiver Propagation Delay MAX3381E 250 MAX3380E 460 MAX UNITS kbps 0.
PAGE 5
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins SUPPLY CURRENT (mA) VCC = +4.2V 11 10 VCC = +2.5V 60 50 30 8 20 7 10 6 250kbps 40 20kbps 500 1000 1500 2000 2500 3000 0 500 LOAD CAPACITANCE (pF) 1000 1500 2000 2500 2 0 -2 VOUT- -4 3000 2.5 3.5 4.5 SUPPLY VOLTAGE (V) 25 1 TRANSMITTER SWITCHING 20 SUPPLY CURRENT (mA) VOUT+ 5.5 SUPPLY CURRENT vs.
PAGE 6
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins MAX3380E/MAX3381E Pin Description PIN NAME 1 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor — 2 V+ +5.5V/+4.
PAGE 7
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins The MAX3380E/MAX3381E include a switchover circuit between RS-232-compliant and RS-232-compatible modes that has approximately 400mV of hysteresis around the switchover point. The hysteresis is shown in Figure 1. This large hysteresis helps to avoid mode change under battery or power-supply bounce. Under a decaying VCC, the charge pump will generate an output voltage of ±5.5V with a V CC input range between +3.
PAGE 8
MAX3380E/MAX3381E +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Table 1.
PAGE 9
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins S 30s TIMER EDGE DETECT R_IN FORCEOFF FORCEOFF POWERDOWN* FORCEON AUTOSHDN AUTOSHDN R * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. FORCEON Figure 2c. AutoShutdown Plus Logic Figure 2d.
PAGE 10
RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω RC 50MΩ to 100MΩ DISCHARGE RESISTANCE CHARGE-CURRENT LIMIT RESISTOR DEVICE UNDER TEST STORAGE CAPACITOR Figure 5a. Human Body ESD Test Model IP 100% 90% Ir HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 6a. IEC 1000-4-2 ESD Test Model I 100% 90% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) IPEAK MAX3380E/MAX3381E +2.35V to +5.
PAGE 11
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.
PAGE 12
MAX3380E/MAX3381E +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins For Figure 9 and Figure 10, a single transmitter was driven at 460kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF. Data Cable Applications The MAX3380E/MAX3381Es’ ±15kV ESD protection on both the RS-232 I/Os as well as the logic I/Os makes them ideal candidates for data cable applications.
PAGE 13
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins MAX3380E/MAX3381E 47μF 0.1μF VCC VL FORCEOFF 0.1μF FORCEON V+ C1+ 0.1μF C10.1μF V- C2+ 0.1μF C2- VBATT MAX3380E/ MAX3381E CELL PHONE LOGIC LEVELS PERIPHERALS RS-232 LEVELS Tx T1IN T1OUT Tx RTS T2IN T2OUT CTS Rx R1OUT R1IN Rx CTS R2OUT R2IN RTS I/O INVALID Figure 11.
PAGE 14
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) TSSOP4.40mm.EPS MAX3380E/MAX3381E +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins PACKAGE OUTLINE, TSSOP 4.40mm BODY 21-0066 I 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.