Maxim MAX221EUE, MAX221EAE, MAX221CUE, MAX221CAE Datasheet

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General Description

The MAX221 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 MAX221 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 low­power shutdown mode when the RS-232 cable is dis­connected, or when the transmitter of the connected
peripheral is off. The MAX221 wakes up and drives the
INVALID pin high when an active RS-232 cable is con­nected, signaling the host that a peripheral is connect­ed to the communications port.

The MAX221 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. For an equivalent RS-232 transceiver
with enhanced ±15kV ESD protection, refer to the
MAX221E data sheet.

Applications

Maintenance/Diagnostic Ports
Industrial Systems
Telecommunications
Set-Top Boxes

Features

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

TSSOP Package

♦ 1µA Supply Current
♦ AutoShutdown Saves Power Without

Changes to BIOS

♦ Guaranteed 250kbps Data Rate

MAX221

+5V, 1µA, Single RS-232 Transceiver

with AutoShutdown

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuit

19-1520; Rev 0; 8/99

PART

MAX221CUE
MAX221CAE
MAX221EUE -40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 TSSOP
16 SSOP
16 TSSOP

AutoShutdown is a trademark of Maxim Integrated Products.

Pin Configuration

Ordering Information

MAX221EAE -40°C to +85°C 16 SSOP

TOP VIEW

1

EN FORCEOFF

C1+

2

V+

3

MAX221

4

C1-

C2+

5

C2-

6

V-

7

RIN

8

TSSOP/SSOP

16

15

14

13

12

11

10

9

V

CC

GND

TOUT

FORCEON

TIN

INVALID

ROUT

+5V

C

BYPASS

0.1µF

C1

0.1µF

C2

0.1µF

11

12

2

4

5

6

1

C1+

C1-

C2+

C2-

TIN

ROUT9

EN

FORCEON

15

V

CC

MAX221

GND

14

V+

V-

TOUT 13

RIN 8

5k

INVALID

FORCEOFF

3

7

10

16

C3

0.1µF

C4

0.1µF

TO POWER­MANAGEMENT
UNIT

V

CC

CAPACITORS MAY BE POLARIZED OR UNPOLARIZED.

MAX221

+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +5V ±10%, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at 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.

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.................................................................................±30V

FORCEON, FORCEOFF, EN.................-0.3V to (V

CC

+ 0.3V)

Output Voltages

TOUT ..............................................(V- - 0.3V) to (V+ + 0.3V)

ROUT, INVALID....................................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration, TOUT .....................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

TSSOP (derated 6.7mW/°C above +70°C) ................533mW

SSOP (derated 7.1mW/°C above +70°C) ..................571mW

Operating Temperature Range

MAX221C_ _ .....................................................0°C to +70°C

MAX221E_ _ ..................................................-40°C to +85°C

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

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

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

Figure 3

Figure 3

No load, TA= +25°C

Figure 3

I

SOURCE

= 1.0mA

I

SINK

= 1.6mA

CONDITIONS

ICC= 1µA, Figure 3

ROUT; I

SINK

= 3.2mA

Figure 3

TIN; EN, FORCEOFF, FORCEON

TA= +25°C, Figure 1

EN = VCC, 0 ≤ ROUT ≤ V

CC

TIN = 0 to V

CC

ROUT; I

SOURCE

= 1.0mA

µs30t

INVL

Receiver Positive or Negative
Threshold to INVALID Low

µs1t

INVH

Receiver Positive or Negative
Threshold to INVALID High

µs250t

WU

Receiver Threshold to
Transmitter Enabled

VVCC- 0.6

INVALID Output Voltage High

V0.4

INVALID Output Voltage Low

V

-0.3 0.3

Receiver Input Threshold,
Transmitter Disabled

-2.7

Positive threshold

V

2.7

Receiver Input Threshold,
Transmitter Enabled

µA

±0.05 ±10

Negative threshold

Output Leakage Current

V

3.5

V

OH

Output Voltage High

mA

510

I

CC

VCCSupply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

V

0.4

V

OL

Output Voltage Low

V

0.8

V

IL

Input Threshold Low

µA

110

I

SHDN

Shutdown Supply Current

µA

110

I

AS

AutoShutdown Supply Current

µA

±1

I

IN

Input Leakage Current

TIN, EN, FORCEOFF

V

2.4

V

IH

Input Threshold High

DC CHARACTERISTICS

LOGIC INPUTS

AUTOSHUTDOWN

MAX221

+5V, 1µA, Single RS-232 Transceiver

with AutoShutdown

_______________________________________________________________________________________ 3

TIMING CHARACTERISTICS

(VCC= +5V ±10%, C1–C4 = 0.1µF, TA = T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +5V ±10%, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

V

CC

= V+ = V- = 0, V

OUT

= ±2V

Driver loaded with 3kΩ to ground

TA= +25°C, V

CC

= 5V

VCC= 5V, no hysteresis in shutdown

TA= +25°C, VCC= 5V

TA= +25°C, VCC= 5V

mA±10 ±60Output Short-Circuit Current

Ω300Output Resistance

V±5 ±9Output Voltage Swing

kΩ357Input Resistance

V0.5Input Hysteresis

V1.7 2.4Input Threshold High

V0.8 1.2Input Threshold Low

V-25 25Input Voltage Range

RL= 3kΩ to 7kΩ, CL= 50pF to 1000pF,
VCC= 4.5V

CONDITIONS

kbps

250

Maximum Data Rate

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= +25°C, VCC= 5V, RL= 3kΩ to 7kΩ,
CL= 500pF to 1000pF, measured from

-3V to +3V or +3V to -3V

(Note 1)

Normal operation

Normal operation

CL= 150pF

V/µs

3630

Transition-Region Slew Rate

ns

50

|

t

PHL

- t

PLH|

Receiver Skew

ns

200

|

t

PHL

- t

PLH|

Transmitter Skew

ns

200

Receiver Output Disable Time

ns

300

Receiver Output Enable Time

µs

0.15

t

PHL,tPLH

Receiver Propagation Delay

Note 1: Transmitter skew is measured at the transmitter zero crosspoints.

RECEIVER INPUT

TRANSMITTER OUTPUT