TEXAS INSTRUMENTS MAX3227 Technical data

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DB PACKAGE

(TOP VIEW)

1 2 3 4 5 6 7 8

16 15 14 13 12 11 10

READY

C1+

V+ C1− C2+ C2−

V−

RIN

FORCEOFF V

GND DOUT FORCEON DIN INVALID ROUT

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3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER

FEATURES APPLICATIONS

• Meets or Exceeds the Requirements of

TIA/EIA-232-F and ITU v.28 Standards

• Operates With 3-V to 5.5-V V

• Operates at Least 1 Mbit/s

• Low Standby Current . . . 1 µ A Typ

• External Capacitors . . . 4 × 0.1 µ F

• Accepts 5-V Logic Input With 3.3-V Supply

• Designed to Be Interchangeable With Maxim™

MAX3227

• Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

• ESD Protection for RS-232 I/O Pins – ± 15 kV – Human-Body Model – ± 8 kV – IEC61000-4-2, Contact Discharge – ± 8 kV – IEC61000-4-2, Air-Gap Discharge

• Auto-Powerdown Plus Feature Automatically Disables Drivers for Power Savings

• Packaged in Plastic Shrink Small-Outline Package

Supply

MAX3227

WITH ± 15-kV ESD PROTECTION

SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006

• Battery-Powered, Hand-Held, and Portable

Equipment

• PDAs and Palmtop PCs

• Notebooks, Sub-Notebooks, and Laptops

• Digital Cameras

• Mobile Phones and Wireless Devices

DESCRIPTION/ORDERING INFORMATION

The MAX3227 consists of one line driver, one line receiver, and a dual charge-pump circuit with ± 15-kV ESD protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to

5.5-V supply. This device operates at data-signaling rates of 1 Mbit/s in normal operating mode and a maximum

of 30-V/ µ s driver output slew rate. This device also features a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.

The MAX3227 achieves a 1- µ A supply current using the auto-powerdown plus feature. This device automatically enters a low-power powerdown mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 s. They turn on again when they sense a valid transition at any driver or receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.

The MAX3227C is characterized for operation from 0 ° C to 70 ° C. The MAX3227I is characterized for operation from –40 ° C to 85 ° C.

AVAILABLE OPTIONS

PACKAGED DEVICE

0 ° C to 70 ° C MAX3227CDB –40 ° C to 85 ° C MAX3227IDB

(1) The DB package is available taped and reeled. Add the suffix R to

device type (e.g., MAX3227CDBR).

SHRINK SMALL OUTLINE

(1)

(DB)

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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MAX3227 3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER WITH ± 15-kV ESD PROTECTION

SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006

FUNCTION TABLE

INPUT CONDITIONS OUTPUT STATES

RECEIVER

FORCEON FORCEOFF LEVEL DRIVER RECEIVER INVALID READY

H H NO NO Active Active L H

H H NO YES Active Active H H

L H YES NO Active Active L H

L H YES YES Active Active H H

L H NO NO Z Active L L

L H NO YES Z Active H L X L X NO Z Active L L Manual powerdown

X L X YES Z Active H L Manual powerdown

INVALID INVALID X NO Z Active L L

INVALID INVALID X YES Active Active H H

(1) H = high level, L = low level, X = irrelevant, Z = high impedance

DRIVER

EDGE

WITHIN

30 s

VALID

RS-232

PRESENT AT

RECEIVER

Auto-Powerdown Plus Conditions

Auto-Powerdown Conditions

(1)

OPERATING MODE

Normal operation, auto-powerdown plus disabled

Normal operation, auto-powerdown plus enabled

Powerdown, auto-powerdown plus enabled

Powerdown, auto-powerdown enabled

Normal operation, auto-powerdown enabled

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DIN

DOUT

Auto-Powerdown

Plus

INVALID

RIN

FORCEOFF

FORCEON

ROUT

READY

3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER

WITH ± 15-kV ESD PROTECTION

SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

C1+ 2 Positive terminal of voltage-doubler charge-pump capacitor C1– 4 Negative terminal of voltage-doubler charge-pump capacitor C2+ 5 Positive terminal of inverting charge-pump capacitor C2– 6 Negative terminal of inverting charge-pump capacitor DIN 11 CMOS driver input DOUT 13 RS-232 driver output

FORCEOFF 16

FORCEON 12 GND 14 Ground

INVALID 10 Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. READY 1 RIN 8 RS-232 receiver input

ROUT 9 CMOS receiver output V+ 3 +2 × V V– 7 –2 × V V

Force-off input, active low. Drive low to shut down drivers, receivers, and charge pump. This overrides auto-shutdown and FORCEON (see Function Table).

Force-on input, active high. Drive high to override powerdown, keeping drivers and receivers on (FORCEOFF must be high) (see Function Table).

Ready to transmit output, active high. READY is enabled high when V– goes below –3.5 V and the device is ready to transmit.

generated by the charge pump

15 3-V to 5.5-V single-supply voltage

DESCRIPTION

MAX3227

LOGIC DIAGRAM (POSITIVE LOGIC)

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MAX3227 3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER WITH ± 15-kV ESD PROTECTION

SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

Supply voltage range

V+ Positive output supply voltage range V– Negative output supply voltage range V+ – V– Supply voltage difference

Input voltage range V

Output voltage range V

Short-circuit duration DOUT to GND Unlimited

Package thermal impedance Lead temperature 1,6 mm (1/16 in) from case for 10 s 260 ° C

Storage temperature range –65 150 ° C

stg

(1) 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 under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltages are with respect to network GND. (3) The package thermal impedance is calculated in accordance with JESD 51-7.

(2)

(1)

MIN MAX UNIT

–0.3 6 V

(2)

–0.3 7 V

0.3 –7 V

Driver ( FORCEOFF, FORCEON) –0.3 6 Receiver –25 25 Driver –13.2 13.2 Receiver ( INVALID, READY) –0.3 V

(3)

13 V

+ 0.3

82 ° C/W

Recommended Operating Conditions

(1)

See Figure 5

MIN NOM MAX UNIT

= 3.3 V 3 3.3 3.6

Supply voltage V

Driver and control high-level input voltage DIN, FORCEOFF, FORCEON V

Driver and control low-level input voltage DIN, FORCEOFF, FORCEON 0 0.8 V

Receiver input voltage –25 25 V

Operating free-air temperature ° C

(1) Test conditions are C1–C4 = 0.1 µ F at V

Electrical Characteristics

(1)

= 3.3 V ± 0.3 V; C1 = 0.047 µ F, C2–C4 = 0.33 µ F at V

= 5 V 4.5 5 5.5

= 3.3 V 2 5.5

= 5 V 2.4 5.5

MAX3227C 0 70 MAX3227I –40 85

= 5 V ± 0.5 V.

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 5 )

PARAMETER TEST CONDITIONS MIN TYP

Input leakage current FORCEOFF, FORCEON ± 0.01 ± 1 µ A

Auto-powerdown plus disabled 0.3 2 mA

Supply current Powered off No load, FORCEOFF at GND 1 10

= 25 ° C)

No load, FORCEOFF and FORCEON at V

No load, FORCEOFF at VCC,

Auto-powerdown plus enabled FORCEON at GND, 1 10

All RIN are open or grounded

(1) Test conditions are C1–C4 = 0.1 µ F at V (2) All typical values are at V

= 3.3 V or V

= 3.3 V ± 0.3 V; C1 = 0.047 µ F, C2–C4 = 0.33 µ F at V

= 5 V, and TA= 25 ° C.

= 5 V ± 0.5 V.

(2)

MAX UNIT

µ A

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