Maxim MAX3187EAX, MAX3187CAX Datasheet

_______________General Description

The MAX3187 complete, dual DTE RS-232 serial port
meets the stringent ESD requirements of the European
Community. 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.

The MAX3187’s six RS-232 transmitters and ten RS-232
receivers require no charge pump. Guaranteed to run
at data rates up to 230kbps, the MAX3187 is optimized
for desktop PC and motherboard applications, and is
compatible with popular software for PC communica­tions. Power-supply current is less than 1mA for I

DD

and ISS, and less than 3mA for ICC.
The MAX3187 is available in a space-saving 36-pin

SSOP package.

________________________Applications

Desktop PC
Motherboards
Instruments
Equipment Meeting IEC 1000-4-2

____________________________Features

♦ Enhanced ESD Protection:

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

♦ Latchup Free During an ESD Event
♦ 36-Pin SSOP Package
♦ Guaranteed 230kbps Data Rate
♦ Flow-Through Pinout
♦ Two Complete DTE Serial Ports
♦ 6 RS-232 Drivers and 10 RS-232 Receivers

MAX3187

±15kV ESD-Protected, EMC-Compliant, 230kbps,

Dual RS-232 Serial Port for Motherboards/Desktops

________________________________________________________________

Maxim Integrated Products

1

35
34
33
32
31
30
29
28
27
26
25
24
23

3
4
5
6
7
8

9
10
11
12
13
14

R3IN
T1OUT
T2OUT
R4IN

T4OUT

T3OUT
R5IN
V

DD

GND
R6IN
R7IN
R8IN

T4IN

R8OUT

R7OUT

R6OUT

V

SS

V

CC

R5OUT

T3IN

R4OUT

T2IN

T1IN

R3OUT

361 R1INR1OUT

2 R2INR2OUT

SSOP

TOP VIEW

MAX3187

22
21

15
16

T5OUT
R9IN

1918 R10INR10OUT

2017 T6OUTT6IN

R90UT

T5IN

19-1186; Rev 1; 10/98

PART

MAX3187CAX
MAX3187EAX -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

36 SSOP
36 SSOP

______________Ordering Information

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

____________________________________________________________Pin Configuration

Typical Operating Circuit appears at end of data sheet.

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +4.5V to +5.5V, VDD= +10.8V to +13.2V, VSS= -10.8V to -13.2V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at TA= +25°C.)

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.

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

V

DD

.........................................................................-0.3V to +14V

V

SS

......................................................................... +0.3V to -14V

Input Voltages

T_IN......................................................................-0.3V to +6V

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

Output Voltages

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

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

CC

+ 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)

SSOP (derate 11.76mW/°C above +70°C) ..................762mW

Operating Temperature Ranges

MAX3187CAX .....................................................0°C to +70°C

MAX3187EAX ..................................................-40°C to +85°C

Storage Temperature Range ............................-65°C to +160°C

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

VCC= VDD= VSS= 0, V

T_OUT

= ±2V

VDD= 12V, VSS= -12V, RL= 3kΩ

T_IN

VDD= 7.0V, VSS= -7.0V, RL= 3kΩ

T_IN

No load
No load

R_OUT; I

SOURCE

= 1mA

No load

R_OUT; I

SINK

= 3.2mA

CONDITIONS

V2.4RS-232 Input Threshold High

V0.75RS-232 Input Threshold Low

V-25 25Receiver Input Voltage Range

mA±35 ±60

RS-232 Output Short-Circuit
Current

Ω300Transmitter Output Resistance

V

±9.5

Output Voltage Swing

±5.0

VVCC- 0.6V

OHR

Output Voltage High

V0.4V

OLR

Output Voltage Low

10.8 13.2V

DD

4.5 5.5V

CC

µA0.01 1Input Leakage Current

V2.0V

IHT

Input Logic Threshold High

V0.8V

ILT

Input Logic Threshold Low

V

-13.2 -10.8V

SS

Operating Voltage Range

750 3000I

CC

370 1000I

DD

µA

370 1000I

SS

Supply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

V0.65RS-232 Input Hysteresis

kΩ3 5 7RS-232 Input Resistance

mA±10

Receiver Output Short-Circuit
Current

RECEIVER INPUTS

TRANSMITTER OUTPUTS

LOGIC

DC CHARACTERISTICS

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,

Dual RS-232 Serial Port for Motherboards/Desktops

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.5V to +5.5V, VDD= +10.8V to +13.2V, VSS= -10.8V to -13.2V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at TA= +25°C.)

VDD= 12V, VSS= -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C

VDD= 12V, VSS= -12V,
RL= 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V,
Figure 1, TA= +25°C

IEC 1000-4-2 (Contact Discharge)

4

Human Body Model

t

PHLT

8 30

µs

SR

Transmitter Output
Propagation Delay, High to Low

V/µsTransition Output Slew Rate

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

VCC= 5V, CL= 50pF, TA= +25°C

VCC= 5V, CL= 50pF, TA= +25°C

CL= 50pF to
1000pF

4.0

4.0

CONDITIONS

t

PHLR

CL= 50pF to
2500pF

µs

VDD= 12V, VSS= -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C

Receiver Output
Propagation Delay, High to Low

t

PLHR

4

µs

t

PLHT

Receiver Output
Propagation Delay, Low to High

µs

Transmitter Output
Propagation Delay, Low to High

T3OUT = -5mA, T1OUT = T2OUT = 5mA

120

±7.5 VMouse Driveability

VCC= 5V, CL= 50pF, TA= +25°C 0.4t

SKR

µs

Receiver Propagation Delay
Skew,

|

t

PLHR

- t

PHLR

|

VCC= 5V, VDD= 12V,
VSS= -12V,
RL= 3kΩ to 7kΩ,
TA= +25°C, any two
transmitters switching

230

kbpsDRGuaranteed Data Rate

±8

±15

VDD= 12V, VSS= -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C

0.4t

SKT

µs

Transmitter Propagation Delay
Skew,

|

t

PLHT

- t

PHLT

|

CL= 50pF to
1000pF

4 30

CL= 150pF to
2500pF

kV

±15

ESD Protection

UNITSMIN TYP MAXSYMBOLPARAMETER

ESD CHARACTERISTICS

TIMING CHARACTERISTICS

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(VCC= +5V, VDD= +12V, VSS= -12V, TA = +25°C, unless otherwise noted.)

40

-40

SUPPLY CURRENT

vs. LOAD CAPACITANCE

20

MAX3187/TOC-01

SUPPLY CURRENT (mA)

0 1000 3000

LOAD CAPACITANCE (pF)

2000 4000 5000

0

-20

30

10

-10

-30

IDD, 240kbps

IDD, 20kbps

ISS, 20kbps

ISS, 120kbps

ISS, 240kbps

I

CC

IDD, 120kbps

2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT DATA RATE/16

3kΩ + C

LOAD

40

-40

10.8

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

20

MAX3187/TOC-02

SUPPLY VOLTAGE (±V)

SUPPLY CURRENT (mA)

12.011.4 12.6 13.2

0

-20

30

10

-10

-30

IDD, 240kbps

IDD, 20kbps

I

SS,

20kbps

I

SS,

120kbps

I

SS,

240kbps

I

CC

IDD, 120kbps

4 TRANSMITTERS AT DATA RATE/16
3kΩ + C

LOAD

VCC = 5V
2 TRANSMITTERS AT DATA RATE

16

0

0 1000 3000

SLEW RATE

vs. LOAD CAPACITANCE

12

MAX3187/TOC-03

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

2000 4000 5000

8

4

14

10

6

2

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

LOAD

RISE

FALL

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3187/TOC-04

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

12.5

10.0

7.5

5.0

2.5
0

-2.5

-5.0

-7.5

-10.0

-12.5
4000 50003000200010000

240kbps

120kbps

120kbps

240kbps

2 TRANSMITTER, 240kbps
4 TRANSMITTERS, 15kbps
3kΩ + C

LOAD

TRANSMITTER OUTPUT VOLTAGE vs.

LOAD CURRENT PER TRANSMITTER

MAX3187/TOC-05

LOAD CURRENT PER TRANSMITTER (mA)

TRANSMITTER OUTPUT VOLTAGE (V)

15

10

5

0

-5

-10

-15
10 12 14 16 186 82 4

0

V

OUT+

V

OUT-

T1

V

CC

V

OUT+

V

OUT-

T2

T3

SLEW RATE

vs. TEMPERATURE

MAX3187/TOC-06

TEMPERATURE (°C)

SLEW RATE (V/ms)

25

20

15

10

5

0

85 105 12545 655 25-35 -15-55

RISE, 500pF

FALL, 500pF

RISE, 2000pF

FALL, 2000pF

_______________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 MAX3187 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 MAX3187 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.

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,

Dual RS-232 Serial Port for Motherboards/Desktops

_______________________________________________________________________________________ 5

______________________________________________________________Pin Description

PIN NAME FUNCTION

4, 5, 7, 14, 15, 17 T1IN–T6IN Transmitter Inputs

9 V

CC

Supply-Voltage Input, 4.5V to 5.5V

27 GND Ground. Connect system to ground.

1, 2, 3, 6, 8, 11,

12, 13, 16, 18

R1OUT–R10OUT Receiver Outputs, swing between GND and V

CC

10 V

SS

Supply-Voltage Input, -10.8V to -13.2V

28 V

DD

Supply-Voltage Input, 10.8V to 13.2V

19, 21, 24, 25, 26,

29, 31, 34, 35, 36

R10IN–R1IN Receiver Inputs

20, 22, 23, 30, 32, 33 T6OUT–T1OUT Transmitter Outputs, swing between VDDand V

SS

Figure 1. Slew-Rate Test Circuit and Timing Diagram

3.0V

DRIVER

INPUT

0V

V

OUT

GENERATOR

SIGNAL

1.5V

t

PHL

t

F2

t

F1

3.3V

3.0V

-3.0V

-3.3V

t

PLH

t

R2

t

R1

R

L

C

L

V

OH

0V

V

OL

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops

6 _______________________________________________________________________________________

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 MAX3187

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.

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

C

s

100pF

R

C

1M

R

D

1500Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE
UNDER

TEST

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

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

Figure 2b. Human Body Model Current Waveform

Figure 2a. Human Body ESD Test Model

R

C

50M to 100M

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

150pF

C

s

R

D

330Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

DEVICE
UNDER

TEST

PEAK-TO-PEAK RINGING

I

r

(NOT DRAWN TO SCALE)

AMPERES

IP 100%

90%

36.8%
10%

0

0

t

RL

TIME

t

DL

CURRENT WAVEFORM

I

100%

90%

PEAK

I

10%

tr = 0.7ns to 1ns

30ns

60ns

t

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,

Dual RS-232 Serial Port for Motherboards/Desktops

_______________________________________________________________________________________ 7

TRANSISTOR COUNT: 419

___________________Chip Information

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

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 VCC, VDD, and VSSwith 0.1µF capaci­tors as close to the part as possible to ensure maxi­mum ESD protection.

Connect any unused transmitter inputs to GND or VCC.
The MAX3187 is not sensitive to power-supply
sequencing, and therefore requires no external protec­tion diodes.

RS-232

INTERCONNECTING

CABLE

T1

T2

T3

T4

T5

R1

R2

T3

T4

T5

R3

R4

R5

R8

R9

R10

R2

R1

R3

T1

T2

TTL/CMOS

LOGIC

I/O

TTL/CMOS
LOGIC
I/O

MOUSE

V+

GND V

SS

GND V

SS

0.1µF

0.1µF

-12V

V+

V-

TX

T6

R6

-12V

0.1µF

0.1µF0.1µF

+5V

V

CC

V

DD

MAX3186MAX3187

V

CCVDD

+12V +5V +12V

0.1µF

R7

__________Typical Operating Circuit

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

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

MAX3187

±15kV ESD-Pr otected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops

________________________________________________________Package Information

SSOP.EPS