MAXIM MAX3230E, MAX3230AE, MAX3231E, MAX3231AE Technical data

General Description

The MAX3230E/AE and MAX3231E/AE are +2.5V to
+5.5V powered EIA/TIA-232 and V.28/V.24 communica­tions interfaces with low power requirements, high data­rate capabilities, and enhanced electrostatic discharge
(ESD) protection, in a chip-scale package (UCSP™)
and WLP package. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air­Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.

The MAX3230E/AE and MAX3231E/AE achieve a 1µA
supply current with Maxim’s AutoShutdown™ feature.
They save power without changing the existing BIOS or
operating systems by entering low-power shutdown
mode when the RS-232 cable is disconnected, or when
the transmitters of the connected peripherals are off.

The transceivers have a proprietary low-dropout trans­mitter output stage, delivering RS-232-compliant perfor­mance from a +3.1V to +5.5V supply, and RS-232­compatible performance with a supply voltage as low
as +2.5V. The dual charge pump requires only four,
small 0.1µF capacitors for operation from a +3.0V sup­ply. Each device is guaranteed to run at data rates of
250kbps while maintaining RS-232 output levels.

The MAX3230E/AE and MAX3231E/AE offer a separate
power-supply input for the logic interface, allowing con­figurable logic levels on the receiver outputs and trans­mitter inputs. Operating over a +1.65V to V

CC

range, V

L

provides the MAX3230E/AE and MAX3231E/AE com­patibility with multiple logic families.

The MAX3231E/AE contains one receiver and one trans­mitter. The MAX3230E/AE contains two receivers and two
transmitters. The MAX3230E/AE and MAX3231E/AE are
available in tiny chip-scale and WLP packaging and are
specified across the extended industrial (-40°C to +85°C)
temperature range.

Applications

Personal Digital Assistants

Cell-Phone Data Lump Cables

Set-Top Boxes

Handheld Devices

Cell Phones

Features

♦ 6 x 5 Chip-Scale Package (UCSP) and WLP

Package

♦ ESD Protection for RS-232 I/O Pins

±15kV—IEC 1000-4-2 Air-Gap Discharge
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—Human Body Model

♦ 1µA Low-Power AutoShutdown

♦ 250kbps Guaranteed Data Rate

♦ Meet EIA/TIA-232 Specifications Down to +3.1V

♦ RS-232 Compatible to +2.5V Allows Operation

from Single Li+ Cell

♦ Small 0.1µF Capacitors

♦ Configurable Logic Levels

MAX3230E/MAX3230AE/MAX3231E/MAX3231AE

±15kV ESD-Protected +2.5V to +5.5V

RS-232 Transceivers in UCSP and WLP

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuits

19-3250; Rev 1; 10/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

UCSP is a trademark of Maxim Integrated Products, Inc.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

Typical Operating Circuits continued at end of data sheet.

Pin Configurations appear at end of data sheet.

+

Denotes a lead-free/RoHS-compliant package.

T = Tape-and-reel.

PART TEMP RANGE BUMP-PACKAGE

MAX3230EEBV-T -40°C to +85°C 6 x 5 UCSP

MAX3230AEEWV+-T -40°C to +85°C 6 x 5 WLP

MAX3231EEBV-T -40°C to +85°C 6 x 5 UCSP

MAX3231AEEWV+-T -40°C to +85°C 6 x 5 WLP

C

BYPASS

C1

0.1μF

C2

0.1μF

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

2.5V TO 5.5V

1.65V TO 5.5V

0.1μF

0.1μF

C1

D1

A2

A3

A6

B6

D6

C6

B5

C1+

C1-

C2+

C2-

T1IN

T2IN

R1OUT

R2OUT

A1 A5

V

CC

MAX3230E/AE

V

L

V

L

V

L

V

L

GND

E1

V

B1

L

V+

A4

V-

T1OUT

E3

T2OUT

E4

R1IN

E6

5kΩ

R2IN

E5

5kΩ

E2

INVALID

C5

FORCEOFFFORCEON

C3

0.1μF

C4

0.1μF

RS-232
OUTPUTS

RS-232
INPUTS

TO POWER­MANAGEMENT
UNIT

V

L

MAX3230E/MAX3230AE/MAX3231E/MAX3231AE

±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP and WLP

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VCCto GND...........................................................-0.3V to +6.0V

V+ to GND .............................................................-0.3V to +7.0V

V- to GND ..............................................................+0.3V to -7.0V

V+ to |V-| (Note 1) ................................................................+13V

V

L

to GND..............................................................-0.3V to +6.0V

Input Voltages

T_IN_, FORCEON, FORCEOFF to GND.....-0.3V to (V

L

+ 0.3V)

R_IN_ to GND ...................................................................±25V

Output Voltages

T

_OUT to GND ...............................................................±13.2V

R

_OUT INVALID to GND ............................-0.3V to (V

L

+ 0.3V)

INVALID to GND.........................................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration T

_

OUT to GND........................Continuous

Continuous Power Dissipation (T

A

= +70°C)

6

✕ 5 UCSP (derate 10.1mW/°C above +70°C) ...........805mW

6

✕ 5 WLP (derate 20mW/°C above +70°C).....................1.6W

Operating Temperature Range ...........................-40°C to +85°C

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

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

Bump Temperature (soldering)

Infrared (15s) ...............................................................+200°C

Vapor Phase (20s) .......................................................+215°C

ELECTRICAL CHARACTERISTICS

(VCC= +2.5V to +5.5V, VL= +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%, TA= T

MIN

to T

MAX

. Typical values are at TA=

+25°C, unless otherwise noted.) (Note 2)

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

DC CHARACTERISTICS

VL Input Voltage Range V

VCC Supply Current,
AutoShutdown

V
AutoShutdown Disabled

VL Supply Current T_IN, I

LOGIC INPUTS

Input-Logic Low T_IN, FORCEON, FORCEOFF 0.4 V
Input-Logic High T_IN, FORCEON, FORCEOFF 0.66 ✕ V

Transmitter Input Hysteresis 0.5 V
Input Leakage Current T_IN, FORCEON, FORCEOFF ±0.01 ±1 µA

RECEIVER OUTPUTS

Output Leakage Currents

Output-Voltage Low I

Output-Voltage High I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

L

FORCEON = GND

Supply Current,

CC

I

I

CC

CC

FORCEOFF = V
FORCEOFF = GND 10

FORCEON, FORCEOFF = V

FORCEON = FORCEOFF = VL, no load 0.3 1 mA

FORCEON or FORCEOFF = GND or VL,

L

V

= VL = +5V, no receivers switching

CC

R_OUT, receivers disabled, FORCEOFF =
GND or in AutoShutdown

= 0.8mA 0.4 V

OUT

= -0.5mA VL - 0.4 VL - 0.1 V

OUT

, all RIN open

L

L

1.65 VCC + 0.3 V

10

1mA

1µA

L

±10 µA

µA

V

MAX3230E/MAX3230AE/MAX3231E/MAX3231AE

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.5V to +5.5V, VL= +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%, TA= T

MIN

to T

MAX

. Typical values are at TA=

+25°C, unless otherwise noted.) (Note 2)

±15kV ESD-Protected +2.5V to +5.5V

RS-232 Transceivers in UCSP and WLP

_______________________________________________________________________________________ 3

RECEIVER INPUTS

Input Voltage Range -25 +25 V

Input-Threshold Low TA = +25°C

Input-Threshold High TA = +25°C

Input Hysteresis 0.5 V

Input Resistance 357kΩ

AUTOMATIC SHUTDOWN

Receiver Input Threshold to
INVALID Output High

Receiver Input Threshold to
INVALID Output Low

Receiver Positive or Negative
Threshold to INVALID High

Receiver Positive or Negative
Threshold to INVALID Low

Receiver Edge to Transmitters
Enabled

INVALID OUTPUT

Output-Voltage Low I

Output-Voltage High I

TRANSMITTER OUTPUTS

VCC Mode Switch Point
(V

VCC Mode Switch Point
(V

V

Output Voltage Swing

Output Resistance VCC = V+ = V- = 0, T_OUT = ±2V 300 10M Ω

Output Short-Circuit Current ±60 mA

Output Leakage Current T_OUT = ±12V, transmitters disabled ±25 µA

ESD PROTECTION

R_IN, T_OUT

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VCC = +3.3V 0.6 1.2

= +5.0V 0.8 1.7

V

CC

VCC = +3.3V 1.3 2.4

= +5.0V 1.8 2.4

V

CC

Figure 3a

t

INVH

t

INVL

t

WU

Falling)

CC

Rising)

CC

M od e S w i tch- P oi nt H yster esi s 400 mV

C C

VCC = +5.0V, Figure 3b 1 µs

VCC = +5.0V, Figure 3b 30 µs

VCC = +5.0V, Figure 3b 100 µs

= 0.8mA 0.4 V

OUT

= -0.5mA VCC - 0.4 VCC - 0.1 V

OUT

T_OUT = ±5.0V to ±3.7V 2.85 3.10 V

T_OUT = ±3.7V to ±5.0V 3.3 3.7 V

All transmitter
outputs loaded
with 3kΩ to
ground

Human Body Model ±15

IEC 1000-4-2 Air-Gap Discharge ±15

IEC 1000-4-2 Contact Discharge ±8

Positive threshold 2.7

Negative threshold -2.7

VCC = +3.1V to +5.5V,
V

falling, TA = +25°C

CC

= +2.5V to +3.1V,

V

CC

V

rising

CC

-0.3 +0.3 V

±3.7

±5 ±5.4

V

V

V

V

kV

MAX3230E/MAX3230AE/MAX3231E/MAX3231AE

±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP and WLP

4 _______________________________________________________________________________________

Note 2: VCCmust be greater than VL.

TIMING CHARACTERISTICS

(VCC= +2.5V to +5.5V, VL= +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%, TA= T

MIN

to T

MAX

. Typical values are at TA=

+25°C, unless otherwise noted.) (Note 2)

Typical Operating Characteristics

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA= +25°C, unless otherwise noted.)

-6

-2

-4

2

0

4

6

0 1500 2000500 1000 2500 3000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3230E/30AE/31E/31AE toc01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OH

V

OL

VCC RISING

0

10

5

20

15

25

30

0 2500 3000

SLEW RATE vs. LOAD CAPACITANCE

MAX3230E/30AE/31E/31AE toc02

LOAD CAPACITANCE (pF)

SLEW RATE (V/μs)

1000500 1500 2000

VCC = 5.5V

VCC = 2.5V

0

6

4

2

8

10

12

14

16

18

20

0 1000500 1500 2000 2500 3000

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE (MAX3231E)

MAX3230E/30AE/31E/31AE toc03

LOAD CAPACITANCE (pF)

OPERATING SUPPLY CURRENT (mA)

250kbps

20kbps

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

R

= 3kΩ, CL = 1000pF, one transmitter

Maximum Data Rate

Receiver Propagation Delay

L

switching

Receiver input to receiver output,
C

= 150pF

L

Receiver-Output Enable Time VCC = VL = +5V 200 ns

Receiver-Output Disable Time VCC = VL = +5V 200 ns

Transmitter Skew | t

Receiver Skew | t

Transition-Region Slew Rate

PHL

PHL

- t

| 100 ns

PLH

- t

|50ns

PLH

R

= 3kΩ to 7kΩ, CL = 150pF to

L

1000pF, T

= +25°C

A

250 kbps

0.15 µs

6 30 V/µs

MAX3230E/MAX3230AE/MAX3231E/MAX3231AE

±15kV ESD-Protected +2.5V to +5.5V

RS-232 Transceivers in UCSP and WLP

_______________________________________________________________________________________ 5

Pin Description

Typical Operating Characteristics (continued)

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA= +25°C, unless otherwise noted.)

0

6

4

2

8

10

12

14

16

18

20

2.5 3.53.0 4.0 4.5 5.0 5.5

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE (MAX3231E)

MAX3230E/30AE/31E/31AE toc04

SUPPLY VOLTAGE (V)

OPERATING SUPPLY CURRENT (mA)

-8

-4

-6

2

0

-2

8

6

4

10

2.5 3.53.0 4.0 4.5 5.0 5.5

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (V

CC

RISING)

MAX3230E/30AE/31E/31AE toc05

SUPPLY VOLTAGE (V)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OH

V

OL

-8

-4

-6

2

0

-2

8

6

4

10

2.5 3.53.0 4.0 4.5 5.0 5.5

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (V

CC

FALLING)

MAX3230E/30AE/31E/31AE toc06

SUPPLY VOLTAGE (V)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OH

V

OL

BUMP

MAX3230E/

MAX3230AE

A1 A1 V

A2 A2 C2+ Inverting Charge-Pump Capacitor Positive Terminal

A3 A3 C2- Inverting Charge-Pump Capacitor Negative Terminal

A4 A4 V- Negative Charge-Pump Output. -5.5V/-4.0V generated by charge pump.

A5 A5 V

A6, B6 A6 T_IN Transmitter Input(s)

B1 B1 V+

B2, B3, B4,
C2, C3, C4,

D2–D5

B5 B5 FORCEON

C1 C1 C1+ Positive Regulated Charge-Pump Capacitor Positive Terminal

C5 C5 FORCEOFF

MAX3231E/

MAX3231AE

B2, B3, B4,

C2, C3, C4,

D2–D5

NAME FUNCTION

CC

L

Supply Voltage. +2.5V to +5.5V supply voltage.

Logic Voltage Input. Logic-level input for receiver outputs and transmitter inputs.
Connect VL to the system-logic supply voltage or VCC if no logic supply is required.

Positive Charge-Pump Output. +5.5V/+4.0V generated by charge pump. If charge
pump is generating +4.0V, the device has switched from RS-232-compliant to RS-232­compatible mode.

No Connection. The MAX3230E/MAX3231E are not populated with solder bumps at

N.C.

these locations. The MAX3230AE/MAX3231AE are populated with electrically isolated
solder bumps at these locations.

Active High FORCEON Input. Drive FORCEON high to override automatic circuitry,
keeping transmitters and charge pumps on.

Active-Low FORCEOFF Input. Drive FORCEOFF low to shut down transmitters,
receivers, and on-board charge pump. This overrides all automatic circuitry and
FORCEON.