TEXAS INSTRUMENTS MAX3243E Technical data

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C2+
C2−

V−
RIN1
RIN2
RIN3
RIN4
RIN5

DOUT1
DOUT2
DOUT3

DIN3
DIN2
DIN1

C1+
V+
V

CC

GND
C1−
FORCEON
FORCEOFF
INVALID
ROUT2B
ROUT1
ROUT2
ROUT3
ROUT4
ROUT5

DB, DW, OR PW PACKAGE

(TOP VIEW)

QFN PACKAGE

(TOP VIEW)

GND
C1–
FORCEON
FORCEOFF
INVALID
ROUTB2
ROUT1
ROUT2

RIN1
RIN2
RIN3
RIN4

RIN5
DOUT1
DOUT2
DOUT3

NCV–C2–

C2+

C1+V+VCCNC

NC

DIN3

DIN2

DIN1

ROUT5

ROUT4

ROUT3

NC

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3132 30 29 28 27 26 25

109 11 12 13 14 15 16

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

FEATURES

• Single-Chip and Single-Supply Interface for

IBM™ PC/AT™ Serial Port

• ESD Protection for RS-232 Bus Pins
– ± 15-kV Human-Body Model (HBM)
– ± 8-kV IEC61000-4-2, Contact Discharge
– ± 15-kV IEC61000-4-2, Air-Gap Discharge

• Meets or Exceeds Requirements of
TIA/EIA-232-F and ITU v.28 Standards

• Operates With 3-V to 5.5-V V

• Always-Active Noninverting Receiver Output

(ROUT2B)

• Designed to Transmit at a Data Rate up to
500 kbit/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

MAX3243E

• Serial-Mouse Driveability

• Auto-Powerdown Feature to Disable Driver

Outputs When No Valid RS-232 Signal Is
Sensed

• Applications
– Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and
Hand-Held Equipment

• Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages

Supply

CC

MAX3243E

WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

DESCRIPTION

The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with
± 15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ± 8-kV ESD (IEC61000-4-2, Contact Discharge)
protection on serial-port connection pins. 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. This
combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, or
compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V
supply. In addition, the device includes an always-active noninverting output (ROUT2B), which allows
applications using the ring indicator to transmit data while the device is powered down. The device operates at
data signaling rates up to 250 kbit/s and a maximum of 30-V/ µ s driver output slew rate.

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.

IBM, PC/AT are trademarks of International Business Machines Corporation.

Copyright © 2005, Texas Instruments Incorporated

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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MAX3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

DESCRIPTION (CONTINUED)

Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is
set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1 µ A.
Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving
a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is
applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any
receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V
or has been between –0.3 V and 0.3 V for less than 30 µ s. INVALID is low (invalid data) if all receiver input
voltages are between –0.3 V and 0.3 V for more than 30 µ s. Refer to Figure 5 for receiver input levels.

The MAX3243EC is characterized for operation from 0 ° C to 70 ° C. The MAX3243EI is characterized for operation
from –40 ° C to 85 ° C.

AVAILABLE OPTIONS

(1)

MAX3243ECRHBR
(Preview)

(Preview)

T

A

0 ° C to 70 ° C MAX3243ECDB MAX3243ECDW MAX3243ECPW

–40 ° C to 85 ° C MAX3243EIDW MAX3243EIPW

MAX3243EIDB MAX3243EIRHBR

SHRINK THIN SHRINK QUAD FLAT

SMALL OUTLINE SMALL OUTLINE NO-LEAD

(DB) (PW) (RHB)

SMALL OUTLINE

(DB)

PACKAGED DEVICES

(1) The DB, DW, and PW packages are available in both tube and taped & reeled. Add the suffix R to orderable (e.g. MAX3243ECDBR for

taped & reeled version).

2

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3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

WITH ± 15-kV IEC ESD PROTECTION

FUNCTION TABLES

ABC

EACH DRIVER

INPUTS

DIN FORCEON FORCEOFF

X X L X Z Powered off
L H H X H
H H H X L
L L H Yes H
H L H Yes L
L L H No Z
H L H No Z

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

VALID RIN

RS-232 LEVEL

(1)

OUTPUT

DOUT

auto-powerdown disabled

auto-powerdown enabled

MAX3243E

SLLS657A – APRIL 2005 – REVISED JUNE 2005

DRIVER STATUS

Normal operation with

Normal operation with

Powered off by

auto-powerdown feature

EACH RECEIVER

INPUTS OUTPUTS

RIN2 FORCEOFF ROUT2B ROUT

L X L X L Z

H X L X H Z

L L H Yes L H

L H H Yes L L
H L H Yes H H
H H H Yes H L

Open Open H Yes L H

(1) H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or

RIN1, VALID RIN

RIN3-RIN5 RS-232 LEVEL

connected driver off

(1)

RECEIVER

STATUS

Powered off while
ROUT2B is active

Normal operation

with

auto-powerdown

disabled/enabled

3

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DIN3

DIN2

DIN1

DOUT3

DOUT2

DOUT1

Auto-powerdown INVALID

RIN1

RIN2

RIN3

RIN4

RIN5

FORCEOFF

FORCEON

ROUT1

ROUT2B

ROUT2

ROUT3

ROUT4

ROUT5

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MAX3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

LOGIC DIAGRAM (POSITIVE LOGIC)

4

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3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

Absolute Maximum Ratings

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

V

CC

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

V

I

V

O

θ

JA

T

stg

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

(2) All voltages are with respect to network GND.
(3) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

(4) The package thermal impedance is calculated in accordance with JESD 51-7.

Supply voltage range

Input voltage range V

Output voltage range V

Package thermal impedance

Lead temperature 1,6 mm (1/16 in) from case for 10 s 260 °C
Storage temperature range –65 150 °C

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.

temperature is PD= (TJ(max) - TA)/ θJA. Operating at the absolute maximum TJof 150 ° C can affect reliability.

(1)

MIN MAX UNIT

(2)

(2)

(2)

(2)

–0.3 6 V
–0.3 7 V

0.3 –7 V

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

CC

DB package 62

(3) (4)

DW package 46 °C/W
PW package 62

MAX3243E

13 V

+ 0.3

Recommended Operating Conditions

(1)

See Figure 6

MIN NOM MAX UNIT

V

= 3.3 V 3 3.3 3.6

Supply voltage V

V

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

IH

V

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

IL

V

Driver and control input voltage DIN, FORCEOFF, FORCEON 0 5.5 V

I

V

Receiver input voltage –25 25 V

I

T

Operating free-air temperature °C

A

(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

CC

CC

V

= 5 V 4.5 5 5.5

CC

V

= 3.3 V 2

CC

V

= 5 V 2.4

CC

MAX3243EC 0 70
MAX3243EI –40 85

= 5 V ± 0.5 V.

CC

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 6 )

PARAMETER TEST CONDITIONS MIN TYP

I

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

I

Auto-powerdown disabled 0.3 1 mA

Supply current

I

CC

(T

= 25 ° C)

A

Powered off No load, FORCEOFF at GND 1 10

Auto-powerdown enabled 1 10

No load,
FORCEOFF and FORCEON at V

No load, FORCEOFF at VCC,
FORCEON at GND,
All RIN are open or grounded,

CC

All DIN are grounded

(2)

MAX UNIT

µ A

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

= 3.3 V or V

CC

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

CC

= 5 V, and TA= 25 ° C.

CC

= 5 V ± 0.5 V.

CC

5

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MAX3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

DRIVER SECTION
Electrical Characteristics

(1)

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 6 )

PARAMETER TEST CONDITIONS MIN TYP

V

High-level output voltage All DOUT at RL= 3 k Ω to GND 5 5.4 V

OH

V

Low-level output voltage All DOUT at RL= 3 k Ω to GND –5 –5.4 V

OL

Output voltage DIN1 = DIN2 = GND, DIN3 = VCC, 3-k Ω to GND at DOUT3,

V

O

(mouse driveability) DOUT1 = DOUT2 = 2.5 mA

I

High-level input current VI= V

IH

I

Low-level input current VIat GND ± 0.01 ± 1 µ A

IL

V

Input hysteresis ± 1 V

hys

I

Short-circuit output current

OS

r

Output resistance VCC, V+, and V– = 0 V, VO= ± 2 V 300 10M Ω

o

I

Output leakage current FORCEOFF = GND, VO= ± 12 V, V

off

(3)

(1) Test conditions are C1–C4 = 0.1 µ F at V
(2) All typical values are at V
(3) Short-circuit durations should be controlled to prevent exceeding the device absolute power dissipation ratings, and not more than one

= 3.3 V or V

CC

CC

V

= 3.6 V, VO= 0 V

CC

V

= 5.5 V, VO= 0 V

CC

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

CC

= 5 V, and TA= 25 ° C.

CC

= 0 to 5.5 V ± 25 µ A

CC

± 5 V

= 5 V ± 0.5 V.

CC

output should be shorted at a time.

Switching Characteristics

(1)

(2)

MAX UNIT

± 0.01 ± 1 µ A

± 60 mA

switching characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise
noted) (see Figure 6 )

PARAMETER TEST CONDITIONS MIN TYP

Maximum data rate 250 500 kbit/s

t

SR(tr) RL= 3 k Ω to 7 k Ω , V/ µ s

sk(p)

Pulse skew
Slew rate, transition region

(see Figure 1)

(3)

(1) Test conditions are C1–C4 = 0.1 µ F at V
(2) All typical values are at V
(3) Pulse skew is defined as |t

CC

PLH

CL= 1000 pF, RL= 3 k Ω
One DOUT switching, See Figure 1

CL= 150 pF to 2500 pF, RL= 3 k Ω to 7 k Ω , See Figure 2 100 ns
V

= 3.3 V, CL= 150 pF to 1000 pF 6 30

CC

PRR = 250 kbit/s

= 3.3 V or V

– t

CC
CC

| of each channel of the same device.

PHL

= 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.

CL= 150 pF to 2500 pF 4 30

= 5 V ± 0.5 V.

CC

(2)

MAX UNIT

ESD Protection

PARAMETER TEST CONDITIONS TYP UNIT

HBM ± 15 kV

Driver outputs (pins 9–11) IEC61000-4-2, Air-Gap Discharge ± 15 kV

IEC61000-4-2, Contact Discharge ± 8 kV

6

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RECEIVER SECTION

MAX3243E

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

Electrical Characteristics

(1)

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 6 )

PARAMETER TEST CONDITIONS MIN TYP

V

OH

V

OL

V

IT+

V

IT–

V

hys

I

off

r

i

High-level output voltage IOH= –1 mA V
Low-level output voltage IOH= 1.6 mA 0.4 V

Positive-going input threshold voltage V

Negative-going input threshold voltage V

Input hysteresis (V

– V

IT+

) 0.5 V

IT–

Output leakage current (except ROUT2B) FORCEOFF = 0 V ± 0.05 ± 10 µ A
Input resistance VI= ± 3 V or ± 25 V 3 5 7 k Ω

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

Switching Characteristics

= 3.3 V or V

CC

(1)

V

= 3.3 V 1.6 2.4

CC

V

= 5 V 1.9 2.4

CC

V

= 3.3 V 0.6 1.1

CC

V

= 5 V 0.8 1.4

CC

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

CC

= 5 V, and TA= 25 ° C.

CC

CC

– 0.6 V

= 5 V ± 0.5 V.

CC

(2)

MAX UNIT

– 0.1 V

CC

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

PARAMETER TEST CONDITIONS TYP

t

PLH

t

PHL

t

en

t

dis

t

sk(p)

Propagation delay time, low- to high-level output CL= 150 pF, See Figure 3 150 ns
Propagation delay time, high- to low-level output 150 ns
Output enable time CL= 150 pF, RL= 3 k Ω , See Figure 4 200 ns
Output disable time 200 ns
Puse skew

(3)

(1) Test conditions are C1–C4 = 0.1 µ F at V
(2) All typical values are at V
(3) Pulse skew is defined as |t

= 3.3 V or V

CC

PLH

- t

PHL

See Figure 3 50 ns

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

CC

= 5 V, and TA= 25 ° C.

CC

| of each channel of the same device.

= 5 V ± 0.5 V.

CC

(2)

UNIT

ESD Protection

PARAMETER TEST CONDITIONS TYP UNIT

HBM ± 15 kV

Driver outputs (pins 4–8) IEC61000-4-2, Air-Gap discharge ± 15 kV

IEC61000-4-2, Contact Discharge ± 8 kV

7

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MAX3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

AUTO-POWERDOWN SECTION
Electrical Characteristics

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

PARAMETER TEST CONDITIONS MIN MAX UNIT

V

IT+(valid)

V

IT–(valid)

V

T(invalid)

V

OH

V

OL

Switching Characteristics

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

t

valid

t

invalid

t

en

Receiver input threshold FORCEON = GND,
for INVALID high-level output voltage FORCEOFF = V

Receiver input threshold FORCEON = GND,
for INVALID high-level output voltage FORCEOFF = V

Receiver input threshold FORCEON = GND,
for INVALID low-level output voltage FORCEOFF = V

INVALID high-level output voltage V

INVALID low-level output voltage 0.4 V

IOH= -1 mA, FORCEON = GND,
FORCEOFF = V

IOL= 1.6 mA, FORCEON = GND,
FORCEOFF = V

CC

CC

CC

CC

CC

–2.7 V

–0.3 0.3 V

– 0.6 V

CC

PARAMETER TEST CONDITIONS TYP

Propagation delay time, low- to high-level output V
Propagation delay time, high- to low-level output V
Supply enable time V

= 5 V 1 µ s

CC

= 5 V 30 µ s

CC

= 5 V 100 µ s

CC

2.7 V

(1)

UNIT

(1) All typical values are at V

= 3.3 V or V

CC

= 5 V, and TA= 25 ° C.

CC

8