MAXIM MAX3228, MAX3229 User Manual

General Description

The MAX3228/MAX3229 are +2.5V to +5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces with low power requirements, and high data-rate capabilities, in a chip-scale package (UCSP™).

The MAX3228/MAX3229 achieve a 1µA supply current with Maxim’s AutoShutdown™ feature. They save power without changes to 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-232 compatible 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 MAX3228/MAX3229 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 VCCrange, VLprovides the MAX3228/MAX3229 compatibility with multiple logic families.

The MAX3229 contains one receiver and one transmitter. The MAX3228 contains two receivers and two transmitters. The MAX3228/MAX3229 are available in tiny chip-scale packaging and are specified across the extended industrial temperature range of -40°C to +85°C.

Applications

Personal Digital Assistants Cell Phone Data Lump Cables Set-Top Boxes Hand-Held Devices Cell Phones

Features

♦ 6 ✕ 5 Chip-Scale Packaging (UCSP) ♦ 1µA Low-Power AutoShutdown ♦ 250kbps Guaranteed Data Rate ♦ Meets 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

MAX3228/MAX3229

+2.5V to +5.5V RS-232 Transceivers

in UCSP

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuits

19-2140; Rev 1; 5/04

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.

*Requires solder temperature profile described in the Absolute Maximum Ratings section.

*UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliabilitly Notice in the UCSP Reliability section of this data sheet for more information.

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.

PART TEMP RANGE

MAX3228EBV -40°C to +85°C 6 x 5 UCSP* MAX3229EBV -40°C to +85°C 6 x 5 UCSP*

BYPASS

0.1µF

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

2.5V TO 5.5V

1.65V TO 5.5V

0.1µF

C1+

C1C2+

C2T1IN

T2IN

R1OUT

R2OUT

A1 A5

MAX3228

GND

T1OUT

T2OUT

R1IN

5kΩ

INVALID

20µA20µA

FORCEOFFFORCEON

V+

V-

R2IN

0.1µF

PIN-

PACKAGE

0.1µF

RS-232 OUTPUTS

RS-232 INPUTS

TO POWERMANAGEMENT UNIT

MAX3228/MAX3229

+2.5V to +5.5V RS-232 Transceivers in UCSP

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

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

Input Voltages

IN, FORCEON, FORCEOFF to GND.......-0.3V to (VL+ 0.3V)

IN to GND .....................................................................±25V

Output Voltages

OUT to GND...............................................................±13.2V

OUT to GND...........................................-0.3V to (VL+ 0.3V)

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

+ 0.3V)

Short-Circuit Duration T

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

Continuous Power Dissipation (T

= +70°C)

✕ 5 UCSP (derate 10.1mW/°C above T

= +70°C)...805mW

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

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

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

Bump Temperature (Soldering) (Note 2)

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 3)

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device

can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed.

DC CHARACTERISTICS

VL Input Voltage Range V

VCC Supply Current, AutoShutdown

VCC Supply Current, AutoShutdown Disabled

VL Supply Current I

LOGIC INPUTS

Pullup Currents FORCEON, FORCEOFF to V Input Logic Low T_IN, FORCEON, FORCEOFF 0.4 V Input Logic High T_IN, FORCEON, FORCEOFF 0.66 x V Transmitter Input Hysteresis 0.5 V Input Leakage Current T_IN ±0.01 ±1 µA

RECEIVER OUTPUTS

Output Leakage Currents

Output Voltage Low I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

FORCEON = GND

FORCEOFF = V FORCEOFF = GND 10 µA

FORCEON, FORCEOFF floating 1 mA FORCEON = FORCEOFF = V

no load FORCEON or FORCEOFF = GND, VCC =

= +5v

FORCEON, FORCEOFF floating 1

R_OUT, receivers disabled, FORCEOFF = GND or in AutoShutdown

= 0.8mA 0.4 V

OUT

, all RIN open

1.65 VCC + 0.3 V

20 µA

10 µA

0.3 1 mA

±10 µA

µA

Output Voltage High I

= -0.5mA VL - 0.4 VL - 0.1 V

OUT

MAX3228/MAX3229

+2.5V to +5.5V RS-232 Transceivers

in UCSP

_______________________________________________________________________________________ 3

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 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

AUTOSHUTDOWN

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

TRANSMITTER OUTPUTS

VCC Mode Switch Point (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

INVALID OUTPUT

Output Voltage Low I Output Voltage High I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VCC = 3.3V 0.6 1.2

= 5.0V 0.8 1.7

VCC = 3.3V 1.3 2.4

= 5.0V 1.8 2.4

Figure 3a

INVH

INVL

Falling)

Rising)

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

T_OUT = ±5.0V to ±3.7V 2.85 3.1 V

T_OUT = ±3.7V to ±5.0V 3.3 3.7 V

All transmitter outputs loaded with 3kΩ to ground.

= 0.8mA 0.4 V

OUT

= -0.5mA V

OUT

Positive threshold 2.7 Negative threshold -2.7

VCC = +3.1V to +5.5V, V T

= +25°C

+3.1V, V

falling,

= +2.5V to

rising

-0.3 0.3 V

±3.7

C C

±5 ±5.4

- 0.4 V

- 0.1 V

C C

MAX3228/MAX3229

+2.5V to +5.5V RS-232 Transceivers in UCSP

4 _______________________________________________________________________________________

Note 3: 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 3)

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

0 1500 2000500 1000 2500 3000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3228/9 toc01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

VCC RISING

0 2500 3000

SLEW RATE vs. LOAD CAPACITANCE

MAX3228/9 toc02

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

1000500 1500 2000

VCC = 5.5V

VCC = 2.5V

6 4 2

0 1000500 1500 2000 2500 3000

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE (MAX3229)

MAX3228/9 toc03

LOAD CAPACITANCE (pF)

OPERATING SUPPLY CURRENT (mA)

250kbps

20kbps

Maximum Data Rate

Receiver Propagation Delay

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 3kΩ, CL = 1000pF, one transmitter

switching Receiver input to receiver output,

= 150pF

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

= 3kΩ to 7kΩ, CL = 150pF to

1000pF, T

= +25°C

250 kbps

0.15 µs

630V/µs

MAX3228/MAX3229

+2.5V to +5.5V RS-232 Transceivers

in UCSP

_______________________________________________________________________________________ 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.)

6 4 2

2.5 3.53.0 4.0 4.5 5.0 5.5

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE (MAX3229)

MAX3228/9 toc04

SUPPLY VOLTAGE (V)

OPERATING SUPPLY CURRENT (mA)

-8

-4

-6

-2

2.5 3.53.0 4.0 4.5 5.0 5.5

TRANSMITTER OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE (V

RISING)

MAX3228/9 toc05

SUPPLY VOLTAGE (V)

TRANSMITTER OUTPUT VOLTAGE (V)

-8

-4

-6

-2

2.5 3.53.0 4.0 4.5 5.0 5.5

TRANSMITTER OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE (V

FALLING)

MAX3228/9 toc06

SUPPLY VOLTAGE (V)

TRANSMITTER OUTPUT VOLTAGE (V)

MAX3228 MAX3229

A1 A1 V A2 A2 C2+ Positive Terminal of Inverting Charge-Pump Capacitor A3 A3 C2- Negative Terminal of Inverting Charge-Pump Capacitor A4 A4 V- -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, D3, D4,

B5 B5 FORCEON

—

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

NAME FUNCTION

B2, B3, B4, C2, C3, C4, D2, D3, D4,

N.C. No Connection. These locations are not populated with solder bumps.

B6, D6,

E4, E6

N.C.

+2.5V to +5.5V Supply Voltage

Logic-Level Input for Receiver Outputs and Transmitter Inputs. Connect VL to the

system logic supply voltage or V

if no logic supply is required.

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

FORCEON Input, Active-High. Drive FORCEON high to override automatic circuitry, keeping transmitters and charge pumps on. Pulls itself high internally if not connected.

No Connection. These locations are populated with solder bumps, but are electrically isolated.

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