Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS232 1/1 TSSOP 16

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General Description

The MAX221E is a +5V powered, single transmit/

receive RS-232 and V.28 communications interface with

automatic shutdown/wake-up features and high data

rate capabilities.

The MAX221E features enhanced electrostatic discharge

(ESD) protection. Both the transmitter output and receiver

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

Gap Discharge Method, to ±8kV using the IEC 1000-4-2

Contact Discharge Method, and to ±15kV using the

Human Body Model.

The MAX221E achieves a low 1µA supply current with

Maxim’s revolutionary AutoShutdown™ feature.

AutoShutdown saves power without changes to the

existing BIOS or operating system by entering low-

power shutdown mode when the RS-232 cable is dis-

connected or when the transmitter of the connected

peripheral is off. The MAX221E wakes up and drives the

INVALID pin high when an active RS-232 cable is con-

nected, signaling the host that a peripheral is connected

to the communications port.

The MAX221E is available in a 16-pin SSOP package as

well as a 16-pin TSSOP that uses 50% less board space

than a 16-pin SO.

Applications

Maintenance/Diagnostic Ports

Industrial Systems

Telecommunications

Set-Top Boxes

Features

♦ Single RS-232 Transceiver in a Small 16-Pin TSSOP

♦ 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

♦ Latchup Free

♦ 1µA Supply Current

♦ AutoShutdown Saves Power without Changes

to BIOS

♦ Guaranteed 250kbps Data Rate

MAX221E

±15kV ESD-Protected, +5V, 1µA, Single RS-232

Transceiver with AutoShutdown

________________________________________________________________

Maxim Integrated Products

EN FORCEOFF

GND

TOUT

FORCEON

TIN

INVALID

ROUT

TOP VIEW

MAX221E

TSSOP/SSOP

C1+

V+

C2-

C1-

C2+

V-

RIN

MAX221E

FORCEON

ROUT9

FORCEOFF

INVALID

GND

TIN

C2-

C2+

C1-

C1+

RIN 8

TOUT 13

V-

V+

0.1µF

BYPASS

0.1µF

+5V

TO POWER-

MANAGEMENT

UNIT

CAPACITORS MAY BE

POLARIZED OR UNPOLARIZED.

Typical Operating Circuit

19-1527; Rev 0; 8/99

PART

MAX221ECUE

MAX221ECAE

MAX221EEUE 40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 TSSOP

16 SSOP

16 TSSOP

Pin Configuration

Ordering Information

AutoShutdown is a trademark of Maxim Integrated Products.

MAX221EEAE 40°C to +85°C 16 SSOP

Summary of content (12 pages)

PAGE 1
9-1527; Rev 0; 8/99 ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown Features ♦ Single RS-232 Transceiver in a Small 16-Pin TSSOP ♦ 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 ♦ Latchup Free ♦ 1µA Supply Current ♦ AutoShutdown Saves Power without Changes to BIOS ♦ Guaranteed 250kbps Data Rate Ordering Information PART TEMP.
PAGE 2
MAX221E ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown ABSOLUTE MAXIMUM RATINGS VCC ..........................................................................-0.3V to +6V V+ ...............................................................(VCC - 0.3V) to +14V V- ...........................................................................-14V to +0.3V Input Voltages TIN ............................................................-0.3V to (V+ + 0.3V) RIN .............................
PAGE 3
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown (VCC = +5V ±10%, C1–C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 25 V 2.4 V RECEIVER INPUT Input Voltage Range -25 Input Threshold Low TA = +25°C, VCC = 5V Input Threshold High TA = +25°C, VCC = 5V 0.8 1.7 1.2 Input Hysteresis VCC = 5V, no hysteresis in shutdown 0.
PAGE 4
Typical Operating Characteristics (VCC = +5V, 250kbps data rate, 0.1µF capacitors, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE SLEW RATE vs. LOAD CAPACITANCE 20kbps 120kbps 250kbps 2 0 250kbps -2 -4 20kbps -6 +SLEW 30 20 -SLEW 120kbps MAX221Etoc03 40 SLEW RATE (V/µs) 4 40 SUPPLY CURRENT (mA) 6 50 MAX221Etoc02 8 OPERATING SUPPLY CURRENT vs.
PAGE 5
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown +5V CBYPASS 0.1µF C1 0.1µF 15 2 C1+ 6 3 C3 0.1µF V+ 4 C15 C2 0.1µF VCC MAX221E C2+ V- 7 C4 0.1µF C2- 11 TIN TOUT 13 3k 9 ROUT The MAX221E’s receiver converts RS-232 signals to CMOS-logic output levels. The receiver has an inverting three-state output and can be active or inactive. In shutdown (FORCEOFF = low) or in AutoShutdown, the receiver is active (Table 1).
PAGE 6
MAX221E ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown Table 1.
PAGE 7
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown RECEIVER INPUT LEVEL TRANSMITTER ENABLED, INVALID HIGH +2.7V INDETERMINATE +0.3V 0 ±15kV ESD Protection AUTOSHUTDOWN, TRANSMITTER DISABLED, 1µA SUPPLY CURRENT, INVALID LOW -0.3V INDETERMINATE -2.
PAGE 8
MAX221E ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR Figure 5a. Human Body ESD Test Model RC 50MΩ to 100MΩ RD 330Ω CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE HIGHVOLTAGE DC SOURCE Cs 150pF DEVICE UNDER TEST STORAGE CAPACITOR Figure 6a.
PAGE 9
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown Using INVALID INVALID indicates when an RS-232 signal is present at the receiver input, and therefore when the port is in use. INVALID can be used in alternative shutdown control schemes where it relieves the processor from constantly polling the part for activity. Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; either polarized or nonpolarized capacitors are acceptable.
PAGE 10
MAX221E ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown 5V/div TIN 5V/div TIN 5V/div TOUT 5V/div TOUT 5V/div ROUT 5V/div ROUT 2µs/div Figure 9. Loopback Test Result at 120kbps 2µs/div Figure 10.
PAGE 11
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown TSSOP.
PAGE 12
±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown SSOP.EPS MAX221E 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.