Datasheet MAX3209EEUU, MAX3209ECUU Datasheet (Maxim)

General Description

The MAX3209E is a complete, dual DTE RS-232 serial
port (6 transmitters, 10 receivers) for motherboards and
desktop PCs that ensures compliance with the stringent
ESD requirements of the European Community. The
device minimizes board space and power consumption
by eliminating the need for a negative power supply; it
integrates two serial ports and a charge pump into a sin­gle 38-pin TSSOP package.

The MAX3209E features a 50µA low-power standby
mode for compliance with system power-management
requirements. During standby, while the device oper­ates from the single +3V to +5.5V logic supply, one
receiver on each port remains active, allowing automatic
system wake-up when peripheral communications
resume.

All transmitter outputs and receiver inputs are protected
to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV
using IEC 1000-4-2 Contact Discharge, and ±15kV
using the Human Body Model, making the device ideal
for use in harsh environments or mission-critical equip­ment. As a result of its robust charge-pump structure,
the MAX3209E guarantees mouse driveability and true
RS-232 operation at data rates up to 460kbps, ensuring
compatibility with PC-to-PC communication software
(such as LapLink™).

________________________Applications

Desktop PCs
Motherboards
Instruments
Equipment Requiring IEC 1000-4-2 Compliance
Telecommunications
Network Servers

Features

♦ Two Complete Serial Ports in a Single 38-Pin

TSSOP Package

♦ Requires Only +12V Supply and Logic

Supply (+3V to +5.5V)

♦ No Negative Supply Required
♦ One Receiver Active per Port in Standby

for System Wake-Up

♦ 460kbps Data Rate; LapLink Compatible
♦ Enhanced ESD Protection

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

♦ Low 50µA Standby Current
♦ Operates with Either +3V or +5V Logic
♦ Guaranteed Mouse Driveability
♦ Small 0.1µF Capacitors
♦ Flow-Through Pinout

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port

with Low-Power Standby for Motherboards/Desktops

________________________________________________________________

Maxim Integrated Products

1

19-1471; Rev 1; 9/99

PART

MAX3209ECUU
MAX3209EEUU -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

38 TSSOP
38 TSSOP

Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

Typical Operating Circuit appears at end of data sheet.

LapLink is a trademark of Traveling Software.

Pin Configuration

TOP VIEW

R3OUT

R2OUT

R1OUT

T3IN

T2IN

T1IN

V

STBY

V

C1+

T4IN

T5IN

T6IN

R6OUT

R7OUT

2 R4INR4OUT

3

4

5

MAX3209E

6

7

8

9

10

DD

11

12

13

14

15

16

TSSOP

381 R5INR5OUT

37

36

R3IN

35

R2IN

34

R1IN

33

T3OUT

T2OUT

32

T1OUT

31

V-

30

C1-

29

GND

28

T4OUT

27

T5OUT

26

T6OUT

25

24

R6IN

R7IN

23

2217 R8INR8OUT

2118 R9INR9OUT

2019 R10INR10OUT

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +10.8V to +13.2V, V

STBY

= +3V to +5.5V, C1 = C2 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C, VDD= +12V, V

STBY

= +3.3V.)

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.

VDD.........................................................................-0.3V to +15V

V

STBY

....................................................................... -0.3V to +7V

V- ........................................................................... +0.3V to -15V

Input Voltages

T_IN ......................................................................-0.3V to +7V

R_IN .................................................................................±30V

Output Voltages

T_OUT..............................................................................±15V

R_OUT.................................................-0.3V to (V

STBY

+ 0.3V)

Short-Circuit Duration

T_OUT (one at a time)............................................Continuous

R_OUT (one at a time)............................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

TSSOP (derate 11.8mW/°C above +70°C) ..................941mW

Operating Temperature Ranges

MAX3209EC_ _ ...................................................0°C to +70°C

MAX3209EE_ _ ................................................-40°C to +85°C

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

Lead Temperature (soldering, 10sec) ............................+300°C

TA= +25°C

VDD= V

STBY

= 0, V

OUT

= ±2V

V

T_OUT

= 0

Transmitter input at GND

T_IN

All transmitter outputs loaded with 3kΩ to GND

T_IN

VDD= +12V, no load, all transmitter inputs at
V

STBY

, all receiver inputs at V

STBY

or uncon-

nected

R_OUT

CONDITIONS

V2.4RS-232 Input Threshold High

V0.4RS-232 Input Threshold Low

V-25 25Receiver Input Voltage Range

Ω300Transmitter Output Resistance

mA±10 ±60

RS-232 Output Short-Circuit
Current

VOutput Voltage Swing ±5.0

V

V

STBY

- 0.3

V

OHR

Output Voltage High

10.8 13.2V

DD

µA25Input Pull-Up Current

V2V

IHT

Input Logic Threshold High

V0.8V

ILT

Input Logic Threshold Low

3 5.5STBY

0.5 1I

DD

mA

Supply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

V

STBY

= 3.3V V0.2 1RS-232 Input Hysteresis

TA= +25°C kΩ357RS-232 Input Resistance

TA= +25°C

Operating Voltage Range V

VDD= 0, V

STBY

= +3.3V, no load, all transmit-

ter inputs at V

STBY

, all receiver inputs at V

STBY

or unconnected

50 100I

STBY

µA

R_OUT; I

SINK

= 1.6mA V0.4V

OLR

Output Voltage Low

VDD= 0, V

STBY

= 5V µA0.05 ±5

Receiver Output Leakage
Current

V

STBY

- 0.6

I

SOURCE

= 40µA

I

SOURCE

= 1mA

RS-232 RECEIVER INPUTS

RS-232 TRANSMITTER OUTPUTS

TRANSMITTER LOGIC INPUTS

DC CHARACTERISTICS

RECEIVER LOGIC OUTPUTS

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port

with Low-Power Standby for Motherboards/Desktops

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +10.8V to +13.2V, V

STBY

= +3V to +5.5V, C1 = C2 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C, VDD= +12V, V

STBY

= +3.3V.)

CL= 1000pF

IEC 1000-4-2 (Contact Discharge)

1

Human Body Model

t

PHLT

µs

SR

Transmitter Output Propagation
Delay, High to Low

V/µsTransmitter Output Slew Rate

IEC 1000-4-2 (Air-Gap Discharge)

CL= 150pF 0.4 1

CONDITIONS

t

PHLR

µs

RL= 3kΩ to 7kΩ, CL= 50pF to 1000pF,
two transmitters switching

Receiver Output Propagation
Delay, High to Low

460DR kbpsGuaranteed Data Rate

±8

±15

61230

RL= 3kΩ to 7kΩ, V

STBY

= 3.3V,
CL= 50pF to 1000pF, TA= +25°C,
measured from +3V to -3V or -3V to +3V

kV

±15

ESD Protection

UNITSMIN TYP MAXSYMBOLPARAMETER

CL= 1000pF 1t

PLHT

µs

Transmitter Output Propagation
Delay, Low to High

T1IN = T2IN = GND, T3IN = V

CC,

T3OUT loaded with 3kΩ to GND, T1OUT and
T2OUT loaded with 2.5mA each

+6 -5 VMouse Driveability

CL= 150pF 0.4 1t

PLHR

µs

Receiver Output Propagation
Delay, Low to High

ESD CHARACTERISTICS

TRANSMITTER TIMING CHARACTERISTICS (Figure 1)

RECEIVER TIMING CHARACTERISTICS

Typical Operating Characteristics

(V

STBY

= +5V, VDD= +12V, C1 = C2 = 0.1µF, TA = +25°C, unless otherwise noted.)

0

15

10

5

20

25

30

0 20001000 3000 4000 5000

SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3209E-02

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

120kbps

240kbps

460kbps

2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C

L

5

15

10

25

20

30

35

10.8 12.011.4 12.6 13.2

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX3209E-01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

460kbps

240kbps

120kbps

C1 = C2 = 0.1µF
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS AT 3kΩ + 1000pF

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops

4 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

6, 7, 8, 12,

13, 14

T_IN TTL/CMOS Transmitter Inputs

9 V

STBY

Standby Power Supply for R5 and R10

11 C1+

Positive Terminal of the Inverting
Charge-Pump Capacitor

1–5, 15–19 R_OUT TTL/CMOS Receiver Outputs

10 V

DD

+12V Single-Supply Voltage

20–24,

34–38

R_IN RS-232 Receiver Inputs

25, 26, 27,

31, 32, 33

T_OUT RS-232 Transmitter Outputs

28 GND Ground

Figure 1. Slew-Rate Test Circuit and Timing Diagram

29 C1-

Negative Terminal of the Inverting
Charge-Pump Capacitor

30 V-

-12V generated by the inverting
charge pump

Typical Operating Characteristics (continued)

(V

STBY

= +5V, VDD= +12V, C1 = C2 = 0.1µF, TA = +25°C, unless otherwise noted.)

0

0.1

0.2

0.3

0.4

0.5

0.6

021 3456789

RECEIVER OUTPUT LOW VOLTAGE

vs. SINK CURRENT

MAX3209E-03

I

SINK

(mA)

RECEIVER OUTPUT LOW VOLTAGE (V)

0

1.5

1.0

0.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0105 15202530

RECEIVER OUTPUT HIGH VOLTAGE

vs. SOURCE CURRENT

MAX3209E-04

I

SOURCE

(mA)

RECEIVER OUTPUT HIGH VOLTAGE (V)

DRIVER

INPUT

3.0V

1.5V

0

t

PHL

3.3V

V

OUT

SIGNAL

GENERATOR

t

F2

t

F1

3.0V

-3.0V

-3.3V

t

PLH

V

OH

0V

t

R2

t

R1

R

L

V

OL

C

L

Detailed Description

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro­static discharges (ESD) encountered during handling
and assembly. The MAX3209E driver outputs and
receiver inputs have extra protection against static
electricity found in normal operation. Maxim’s engineers
developed state-of-the-art structures to protect these
pins against ±15kV ESD, without damage. After an ESD
event, the MAX3209E continues working without latchup.

ESD protection can be tested in several ways. The
transmitter outputs and receiver inputs are character­ized for protection to the following:

1) ±15kV using the Human Body Model

2) ±8kV using the Contact-Discharge Method specified
in IEC 1000-4-2 (formerly IEC 801-2)

3) ±15kV using the Air-Gap Method specified in
IEC 1000-4-2 (formerly IEC 801-2)

ESD Test Conditions

ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.

Human Body Model

Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis­charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the device through a

1.5kΩ resistor.

IEC 1000-4-2

Since January 1996, all equipment manufactured
and/or sold in the European community has been
required to meet the stringent IEC 1000-4-2 specifica­tion. The IEC 1000-4-2 standard covers ESD testing
and performance of finished equipment; it does not
specifically refer to integrated circuits. The MAX3209E
helps you design equipment that meets Level 4 (the
highest level) of IEC 1000-4-2, without additional ESD­protection components.

The main difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2. Because series resistance is
lower in the IEC 1000-4-2 ESD test model (Figure 3a), the
ESD withstand voltage measured to this standard is gen­erally lower than that measured using the Human Body
Model. Figure 3b shows the current waveform for the
±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test.

The Air-Gap test involves approaching the device with a
charge probe. The Contact-Discharge method connects
the probe to the device before the probe is energized.

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port

with Low-Power Standby for Motherboards/Desktops

_______________________________________________________________________________________ 5

Figure 3a. IEC 1000-4-2 ESD Test Model

Figure 2b. Human Body Model Current Waveform

Figure 2a. Human Body ESD Test Model

R

R

C

1M

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

100pF

C

s

IP 100%

90%

AMPERES

36.8%

10%

0

0

t

RL

D

1500Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

I

r

TIME

t

DL

CURRENT WAVEFORM

DEVICE
UNDER

TEST

PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)

HIGH-

VOLTAGE

DC

SOURCE

R

C

50M to 100M

CHARGE-CURRENT

LIMIT RESISTOR

C

150pF

s

R

D

330Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

DEVICE
UNDER

TEST

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops

6 _______________________________________________________________________________________

Machine Model

The Machine Model for ESD testing uses a 200pF stor­age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-232
inputs and outputs) require this protection during man­ufacturing. Therefore, the Machine Model is less rele­vant to the I/O ports than are the Human Body Model
and IEC 1000-4-2.

Applications Information

R5 and R10 Active in Standby Mode

The MAX3209E is placed in standby mode when VDDis
not present, provided that V

STBY

remains at +3V to
+5.5V. In standby mode, receivers R5 and R10 remain
active, consuming 100µA max while unloaded. Standby
mode allows activity to be sensed on the serial ports so
that main power can be restored by the power-man­agement unit, as shown in Figure 4.

Layout Considerations

Use proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass into ground, so
be sure to minimize the ground-lead return path to the
power supply. A separate return path to the power sup­ply is recommend. Trace widths should be greater than
40 mils. Bypass VDDand V

STBY

with 0.1µF capacitors
as close to the part as possible to ensure maximum
ESD protection.

The MAX3209E is not sensitive to power-supply
sequencing, and therefore requires no external protec­tion diodes.

Interconnection with 3V and 5V Logic

The MAX3209E can directly interface with various 3V
and 5V logic families, including ACT and HCT CMOS.
See Table 1 for more information on possible combina­tions of interconnections.

Mouse Driveability

The MAX3209E has been specifically designed to
power serial mice while operating from low-voltage
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3209E successfully drove all serial
mice tested and met their respective current and volt­age requirements.

Figure 4. MAX3209E in Standby Mode

Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform

SYSTEM POWER-

SUPPLY VOLTAGE

(V)

V

STBY

SUPPLY

VOLTAGE

(V)

3.33.3

COMPATIBILITY

Compatible with all
CMOS families.

55

Compatible with all
TTL and CMOS fami­lies.

3.35

Compatible with ACT
and HCT CMOS, and
with AC, HC, or
CD4000 CMOS.

Table 1. Logic Family Compatibility with
Various Supply Voltages

I

100%

90%

PEAK

I

10%

tR = 0.7ns to 1ns

30ns

60ns

+12V

SUPER

I/O

t

POWER-MANAGEMENT UNIT

V

STBY

R5

R10

R_

T_

V

DD

MAX3209E

ALL OTHER
RECEIVERS
INACTIVE

ALL TRANSMITTERS
INACTIVE

GND

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port

with Low-Power Standby for Motherboards/Desktops

_______________________________________________________________________________________ 7

TRANSISTOR COUNT: 774

___________________Chip Information

__________Typical Operating Circuit

+5V

+12V +5V +12V

0.1µF

V

STBYVDD

T1

0.1µF0.1µF

V

V

CC

MAX3186MAX3209E

R1

0.1µF

DD

TTL/CMOS

C1

0.1µF

LOGIC

T2

INTERCONNECTING

0.1µF
C2

RS-232

CABLE

V+

V+

V-

TX

T3

I/O

C1+

C1-

GND

R1

R2

R3

R4

R5

T4

T5

T6

R6

R7

R8

R9

R10

V-

R2

R3

T1

T2

T3

T4

T5

GND V

MOUSE

-12V

TTL/CMOS
LOGIC
I/O

SS

0.1µF

MAX3209E

±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

8

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© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

________________________________________________________Package Information

TSSOP, 4.40mm.EPS