MAXIM MAX3187EAX

19-1186; Rev 1; 10/98
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
____________________________Features
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.
♦ Enhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
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.
♦ 36-Pin SSOP Package
________________________Applications
♦ Latchup Free During an ESD Event
♦ Guaranteed 230kbps Data Rate
♦ Flow-Through Pinout
♦ Two Complete DTE Serial Ports
♦ 6 RS-232 Drivers and 10 RS-232 Receivers
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
Desktop PC
MAX3187CAX
0°C to +70°C
36 SSOP
Motherboards
MAX3187EAX
-40°C to +85°C
36 SSOP
Instruments
Typical Operating Circuit appears at end of data sheet.
Equipment Meeting IEC 1000-4-2
____________________________________________________________Pin Configuration
TOP VIEW
R1OUT
1
36 R1IN
R2OUT
2
35 R2IN
R3OUT
3
34 R3IN
T1IN
4
33 T1OUT
T2IN
5
R4OUT
6
MAX3187
32 T2OUT
31 R4IN
T3IN
7
30 T3OUT
R5OUT
8
29 R5IN
VCC
9
28 VDD
VSS 10
27 GND
R6OUT 11
26 R6IN
R7OUT 12
25 R7IN
R8OUT 13
24 R8IN
T4IN 14
23 T4OUT
T5IN 15
22 T5OUT
R90UT 16
21 R9IN
T6IN 17
20 T6OUT
R10OUT 18
19 R10IN
SSOP
________________________________________________________________ Maxim Integrated Products
1
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For small orders, phone 1-800-835-8769.
MAX3187
_______________General Description
MAX3187
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +7V
VDD .........................................................................-0.3V to +14V
VSS......................................................................... +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 (VCC + 0.3V)
Short-Circuit Duration
T_OUT (one at a time) ............................................Continuous
R_OUT (one at a time)............................................Continuous
Continuous Power Dissipation (TA = +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
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.
ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, VDD = +10.8V to +13.2V, VSS = -10.8V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
VCC
Operating Voltage Range
4.5
5.5
VDD
10.8
13.2
VSS
-13.2
-10.8
ICC
No load
750
3000
IDD
No load
370
1000
ISS
No load
370
1000
Input Logic Threshold Low
VILT
T_IN
Input Logic Threshold High
VIHT
T_IN
Supply Current
V
µA
LOGIC
Input Leakage Current
VOLR
R_OUT; ISINK = 3.2mA
Output Voltage High
VOHR
R_OUT; ISOURCE = 1mA
V
1
µA
0.4
V
V
0.01
Output Voltage Low
0.8
2.0
VCC - 0.6
V
TRANSMITTER OUTPUTS
Output Voltage Swing
Transmitter Output Resistance
VDD = 7.0V, VSS = -7.0V, RL = 3kΩ
±5.0
VDD = 12V, VSS = -12V, RL = 3kΩ
±9.5
VCC = VDD = VSS = 0, VT_OUT = ±2V
300
RS-232 Output Short-Circuit
Current
V
Ω
±35
±60
mA
25
V
RECEIVER INPUTS
Receiver Input Voltage Range
-25
RS-232 Input Threshold Low
0.75
V
RS-232 Input Threshold High
RS-232 Input Hysteresis
RS-232 Input Resistance
Receiver Output Short-Circuit
Current
2
2.4
V
7
kΩ
0.65
3
5
±10
_______________________________________________________________________________________
V
mA
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
(VCC = +4.5V to +5.5V, VDD = +10.8V to +13.2V, VSS = -10.8V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ESD CHARACTERISTICS
Human Body Model
ESD Protection
±15
IEC 1000-4-2 (Contact Discharge)
±8
IEC 1000-4-2 (Air-Gap Discharge)
±15
kV
TIMING CHARACTERISTICS
Transmitter Output
Propagation Delay, Low to High
tPLHT
VDD = 12V, VSS = -12V, RL = 3kΩ,
CL = 1000pF, TA = +25°C
4
µs
Transmitter Output
Propagation Delay, High to Low
tPHLT
VDD = 12V, VSS = -12V, RL = 3kΩ,
CL = 1000pF, TA = +25°C
4
µs
Transmitter Propagation Delay
Skew, | tPLHT - tPHLT |
tSKT
VDD = 12V, VSS = -12V, RL = 3kΩ,
CL = 1000pF, TA = +25°C
0.4
µs
SR
VDD = 12V, VSS = -12V,
RL = 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V,
Figure 1, TA = +25°C
Transition Output Slew Rate
CL = 150pF to
2500pF
4
30
CL = 50pF to
1000pF
8
30
V/µs
Receiver Output
Propagation Delay, Low to High
tPLHR
VCC = 5V, CL = 50pF, TA = +25°C
4.0
µs
Receiver Output
Propagation Delay, High to Low
tPHLR
VCC = 5V, CL = 50pF, TA = +25°C
4.0
µs
Receiver Propagation Delay
Skew, | tPLHR - tPHLR |
tSKR
VCC = 5V, CL = 50pF, TA = +25°C
0.4
µs
DR
VCC = 5V, VDD = 12V,
VSS = -12V,
RL = 3kΩ to 7kΩ,
TA = +25°C, any two
transmitters switching
Guaranteed Data Rate
Mouse Driveability
CL = 50pF to
2500pF
120
CL = 50pF to
1000pF
230
kbps
T3OUT = -5mA, T1OUT = T2OUT = 5mA
±7.5
V
_______________________________________________________________________________________
3
MAX3187
ELECTRICAL CHARACTERISTICS (continued)
__________________________________________Typical Operating Characteristics
(VCC = +5V, VDD = +12V, VSS = -12V, TA = +25°C, unless otherwise noted.)
20
IDD, 20kbps
ICC
VCC = 5V
2 TRANSMITTERS AT DATA RATE
ISS, 20kbps
4 TRANSMITTERS AT DATA RATE/16
3kΩ + CLOAD
-10
ISS, 120kbps
IDD, 120kbps
20
ICC
2 TRANSMITTERS AT DATA RATE
0
4 TRANSMITTERS AT DATA RATE/16
3kΩ + CLOAD
ISS, 20kbps
-10
ISS, 120kbps
-20
-30
-40
12.0
12.6
0
13.2
3000
4000
1000
2000
3000
4000
240kbps
-7.5
120kbps
MAX3187/TOC-05
10
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
20
VOUT+
5
T1
VOUT+
0
T2
-5
VCC
VOUTVOUT-
T3
5000
FALL, 500pF
15
RISE, 500pF
10
RISE, 2000pF
5
-10
-15
-12.5
25
SLEW RATE (V/ms)
-2.5
15
TRANSMITTER OUTPUT VOLTAGE (V)
MAX3187/TOC-04
SLEW RATE
vs. TEMPERATURE
2 TRANSMITTER, 240kbps
4 TRANSMITTERS, 15kbps
3kΩ + CLOAD
0
0
5000
TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CURRENT PER TRANSMITTER
240kbps
-10.0
2000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
7.5
-5.0
1000
LOAD CAPACITANCE (pF)
120kbps
0
0
LOAD CAPACITANCE (pF)
10.0
2.5
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT DATA RATE/16
3kΩ + CLOAD
SUPPLY VOLTAGE (±V)
12.5
5.0
6
2
-40
11.4
8
4
-30
10.8
FALL
10
ISS, 240kbps
ISS, 240kbps
4
12
IDD, 20kbps
10
RISE
14
MAX3187/TOC-06
-20
30
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
IDD, 120kbps
IDD, 240kbps
SLEW RATE (V/µs)
30
16
MAX3187/TOC-01
IDD, 240kbps
0
40
MAX3187/TOC-02
40
10
SLEW RATE
vs. LOAD CAPACITANCE
SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3187/TOC-03
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TRANSMITTER OUTPUT VOLTAGE (V)
MAX3187
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
FALL, 2000pF
0
0
2
4
6
8
10
12
14
16
LOAD CURRENT PER TRANSMITTER (mA)
18
-55 -35 -15
5
25
45
65
TEMPERATURE (°C)
_______________________________________________________________________________________
85 105 125
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
PIN
NAME
FUNCTION
1, 2, 3, 6, 8, 11,
12, 13, 16, 18
R1OUT–R10OUT
4, 5, 7, 14, 15, 17
T1IN–T6IN
9
VCC
Supply-Voltage Input, 4.5V to 5.5V
10
VSS
Supply-Voltage Input, -10.8V to -13.2V
27
GND
Ground. Connect system to ground.
28
VDD
Supply-Voltage Input, 10.8V to 13.2V
19, 21, 24, 25, 26,
29, 31, 34, 35, 36
R10IN–R1IN
20, 22, 23, 30, 32, 33
T6OUT–T1OUT
Receiver Outputs, swing between GND and VCC
Transmitter Inputs
Receiver Inputs
Transmitter Outputs, swing between VDD and VSS
_______________Detailed Description
±15kV ESD Protection
3.0V
DRIVER
INPUT
0V
1.5V
tPHL
tPLH
VOH
3.3V
3.0V
VOUT
0V
-3.0V
-3.3V
tF2
tR2
tF1
tR1
VOL
SIGNAL
GENERATOR
RL
CL
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.
Figure 1. Slew-Rate Test Circuit and Timing Diagram
_______________________________________________________________________________________
5
MAX3187
______________________________________________________________Pin Description
MAX3187
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
RC
1M
CHARGE-CURRENT
LIMIT RESISTOR
RD
1500Ω
IP 100%
90%
DISCHARGE
RESISTANCE
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
36.8%
10%
0
0
Figure 2a. Human Body ESD Test Model
CHARGE-CURRENT
LIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
150pF
Figure 2b. Human Body Model Current Waveform
I
100%
90%
RD
330Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
tDL
CURRENT WAVEFORM
IPEAK
RC
50M to 100M
TIME
tRL
DEVICE
UNDER
TEST
10%
tr = 0.7ns to 1ns
t
30ns
60ns
Figure 3a. IEC 1000-4-2 ESD Test Model
Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform
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.
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.
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
6
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
__________Typical Operating Circuit
0.1µF
+5V
+12V
VCC
VDD
0.1µF 0.1µF
MAX3187
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 VSS with 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.
+5V
+12V
VCC
VDD
MAX3186
T1
R1
R2
T2
RS-232
TTL/CMOS
LOGIC
I/O
0.1µF
T3
TTL/CMOS
LOGIC
I/O
R3
INTERCONNECTING
T1
R1
CABLE
R2
T2
R3
T3
R4
T4
R5
T5
V+
T4
V+
T5
VSS
-12V
0.1µF
V-
T6
___________________Chip Information
GND
TX
R6
MOUSE
R7
TRANSISTOR COUNT: 419
R8
R9
R10
GND
VSS
-12V
0.1µF
_______________________________________________________________________________________
7
MAX3187
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.
________________________________________________________Package Information
SSOP.EPS
MAX3187
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port 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 _____________________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.