Maxim MAX221EEUE, MAX221EEAE, MAX221ECUE, MAX221ECAE Datasheet

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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 Air­Gap 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 low­power shutdown mode when the RS-232 cable is dis­connected 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 con­nected, 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

1

Typical Operating Circuit

19-1527; Rev 0; 8/99

PART

MAX221ECUE
MAX221ECAE
MAX221EEUE 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

Pin Configuration

Ordering Information

AutoShutdown is a trademark of Maxim Integrated Products.

MAX221EEAE 40°C to +85°C 16 SSOP

TOP VIEW

1

EN FORCEOFF

C1+

2

V+

3

4

C1-

C2+

5

C2-

6

V-

7

RIN

8

16

15

V

CC

14

GND

MAX221E

TSSOP/SSOP

13

12

11

10

9

TOUT

FORCEON

TIN

INVALID

ROUT

C

BYPASS

0.1µF

0.1µF

0.1µF

C1

C2

+5V

11

12

2

4

5

6

1

C1+

C1-

C2+

C2-

TIN

ROUT9

EN

FORCEON

15

V

CC

MAX221E

GND

14

V+

V-

TOUT 13

RIN 8

5k

INVALID

FORCEOFF

CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.

3

7

10

16

C3

0.1µF

C4

0.1µF

TO POWER­MANAGEMENT
UNIT

V

CC

MAX221E

±15kV ESD-Protected, +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+ ...............................................................(V

CC

- 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)

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

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

Operating Temperature Range

MAX221EC_ _. ....................................................0°C to +70°C

MAX221EE_ _ ..................................................-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

Input Leakage Current

EN, FORCEOFF, TIN

V

2.4

V

IH

Input Threshold High

DC CHARACTERISTICS

LOGIC INPUTS

AUTOSHUTDOWN

MAX221E

±15kV ESD-Protected, +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.)

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

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/µs3630Transition-Region Slew Rate

ns

50

|t

PHL tPLH

|Receiver Skew

ns

200

|t

PHL tPLH

|Transmitter Skew

ns

200

Receiver Output Disable Time

ns

300

Receiver Output Enable Time

ms

0.15

t

PHL,tPLH

Receiver Propagation Delay

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

IEC 1000-4-2 Air-Gap Discharge

kV

±15

RIN, TOUT IEC 1000-4-2 Contact Discharge ±8

Human Body Model ±15

RECEIVER INPUT

TRANSMITTER OUTPUT

ESD PROTECTION

MAX221E

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

4 _______________________________________________________________________________________

NAME FUNCTION

1

EN

Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver output
(ROUT) into a high-impedance state.

2 C1+ Positive Terminal of the Voltage Doubler Charge-Pump Capacitor

PIN

3 V+ Positive Voltage Generated by the Charge Pump

4 C1- Negative Terminal of the Voltage Doubler Charge-Pump Capacitor

8 RIN RS-232 Receiver Input, ±15kV ESD protected

7 V- Negative Voltage Generated by the Charge Pump

6 C2- Negative Terminal of the Inverting Charge-Pump Capacitor

5 C2+ Positive Terminal of the Inverting Charge-Pump Capacitor

13 TOUT RS-232 Transmitter Output, ±15kV ESD Protected

12 FORCEON

Drive high to override automatic circuitry, keeping transmitter and charge pump on. FORCEOFF
must be high (Table 1).

11 TIN TTL/CMOS Transmitter Input

10

INVALID

Output of the Invalid Signal Detector. INVALID is pulled low if no valid RS-232 level is present on
the receiver input.

9 ROUT TTL/CMOS Receiver Output

Pin Description

14 GND Ground

15 V

CC

+4.5V to +5.5V Supply Voltage

16

FORCEOFF

Force-Off Input, active low. Drive low to shut down transmitter, receiver, and on-board charge
pump. This overrides all automatic circuitry and FORCEON (Table 1).

-10

-6

-8

-2

-4

2

0

4

8

6

10

0

1000

2000

3000

4000

5000

TRANSMITTER OUTPUT

VOLTAGE vs. LOAD CAPACITANCE

MAX221Etoc01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

250kbps

250kbps

120kbps

20kbps

20kbps

120kbps

0

10

20

30

40

50

0

1000

2000

3000

4000

5000

OPERATING SUPPLY

CURRENT vs. LOAD CAPACITANCE

MAX221Etoc03

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

250kbps

20kbps

120kbps

Typical Operating Characteristics

(VCC= +5V, 250kbps data rate, 0.1µF capacitors, transmitter loaded with 3kΩ and CL, TA= +25°C, unless otherwise noted.)

50

SLEW RATE vs.

LOAD CAPACITANCE

40

+SLEW

30

20

SLEW RATE (V/µs)

10

0

0

-SLEW

1000

2000

LOAD CAPACITANCE (pF)

3000

4000

MAX221Etoc02

5000