19-1120; Rev 0; 9/96
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
_______________General Description
The MAX1406 is an RS-232 IC designed to meet the
stringent electrostatic discharge (ESD) requirements of
the European community. All transmitter outputs and
receiver inputs are protected to ±15kV using IEC1000-4-2
Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.
The MAX1406 has three RS-232 transmitters and three
RS-232 receivers, and is optimized for operation in
printer, modem, and telecom applications. It is guaran-
teed to run at data rates up to 230kbps, providing com-
patibility with popular software for communicating with
personal computers. Power-supply current is less than
500µA for I
DD
and I
SS,
and less than 1mA for I
CC.
The MAX1406 is pin and functionally compatible with the
industry-standard MC145406, so existing designs can
instantly become Electromagnetic Compatibility (EMC)
compliant. The MAX1406 is available in DIP and SO pack-
ages, and in a tiny SSOP that reduces board space.
____________________________Features
o
Enhanced ESD Protection:
±15kV Human Body Model
±8kV IEC1000-4-2, Contact Discharge
±15kV IEC1000-4-2, Air-Gap Discharge
o
Latchup Free During an ESD Event
o
16-Pin SSOP or SO Packages
o
Guaranteed 230kbps Data Rate
o
Flow-Through Pinout
o
Pin Compatible with MC145406
MAX1406
______________Ordering Information
PART
MAX1406CPE
MAX1406CWE
MAX1406CAE
MAX1406C/D
MAX1406EPE
MAX1406EWE
MAX1406EAE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Plastic DIP
16 Wide SO
16 SSOP
Dice*
16 Plastic DIP
16 Wide SO
16 SSOP
________________________Applications
Telecommunications
Modems
Printers
Instruments
Equipment Meeting IEC1000-4-2
*Dice are specified at T
A
= +25°C, DC parameters only.
________________Functional Diagram
+5V
0.1µF
__________________Pin Configuration
TOP VIEW
V
DD
1
R1IN 2
T1OUT 3
R2IN 4
T2OUT 5
R3IN 6
T3OUT 7
V
SS
8
16 V
CC
15 R1OUT
14 T1IN
+12V
0.1µF
V
DD
V
CC
V
SS
-12V
0.1µF
MAX1406
T1IN
T2IN
T3IN
R1OUT
R2OUT
R3OUT
T1
T2
T3
R1
R2
R3
GND
T1OUT
T2OUT
T3OUT
R1IN
R2IN
R3IN
MAX1406
13 R2OUT
12 T2IN
11 R3OUT
10 T3IN
9
GND
DIP/SO/SSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
MAX1406
ABSOLUTE MAXIMUM RATINGS
V
CC
...........................................................................-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)
DIP (derate 10.53mW/°C above +70°C) .......................842mW
Wide SO (derate 20.00mW/°C above +70°C)...................1.6W
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Ranges
MAX1406C_E .......................................................0°C to +70°C
MAX1406E_E ....................................................-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
(V
CC
= +4.5V to +5.5V, V
DD
= +10.8V to +13.2V, V
SS
= -10.8V to -13.2V, T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
DC CHARACTERISTICS
V
CC
Operating Voltage Range
V
DD
V
SS
I
CC
Supply Current
LOGIC
Input Logic Threshold Low
Input Logic Threshold High
Input Leakage Current
Output Voltage Low
Output Voltage High
TRANSMITTER OUTPUTS
Output Voltage Swing
Transmitter Output Resistance
RS-232 Output Short-Circuit
Current
RECEIVER INPUTS
Receiver Input Voltage
Operating Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
0.65
-25
0.75
2.4
+25
V
V
V
V
V
DD
= 7.0V, V
SS
= -7.0V, R
L
= 3kΩ
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ
V
CC
= V
DD
= V
SS
= 0V, V
T_OUT
= ±2V
±5.0
±9.5
300
±35
±60
V
Ω
mA
V
OLR
V
OHR
R_
OUT;
I
SINK
= 3.2mA
R_
OUT;
I
SOURCE
= 1mA
V
CC
- 0.6
V
ILT
V
IHT
T_
IN
T_
IN
2.0
0.01
1
0.4
0.8
V
V
µA
V
V
I
DD
I
SS
No load
4.5
10.8
-13.2
230
185
185
5.5
13.2
-10.8
1000
500
500
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.5V to +5.5V, V
DD
= +10.8V to +13.2V, V
SS
= -10.8V to -13.2V, T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
RECEIVER INPUTS (continued)
RS-232 Input Resistance
Receiver Output Short-Circuit
Current
ESD CHARACTERISTICS
Human Body Model
ESD Protection
IEC1000-4-2 (Contact Discharge)
IEC1000-4-2 (Air-Gap Discharge)
±15
±8
±15
kV
3
5
±10
7
kΩ
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1406
TIMING CHARACTERISTICS
(T
A
= +25°C, unless otherwise noted.)
PARAMETER
Transmitter Output Propagation
Delay, Low to High
Transmitter Output Propagation
Delay, High to Low
Transmitter Propagation Delay
Skew,
|
t
PLHT
- t
PHLT
|
SYMBOL
t
PLHT
t
PLHT
t
SKT
CONDITIONS
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ, C
L
= 1000pF
V
DD
= 12V, V
SS
= -12V R
L
= 3kΩ, C
L
= 1000pF
V
DD
= 12V, V
SS
= -12V R
L
= 3kΩ, C
L
= 1000pF
C
L
= 150pF to
2500pF
C
L
= 50pF to
1000pF
4
8
12
12
MIN
TYP
MAX
4
UNITS
µs
µs
µs
4
0.4
30
Transition Output Slew Rate
SR
V
DD
= 12V, V
SS
= -12V,
R
L
= 3kΩ to 7kΩ, measured
from +3V to -3V or -3V to +3V
V/µs
30
4.0
µs
µs
µs
Receiver Output Propagation
Delay, Low to High
Receiver Output Propagation
Delay, High to Low
Receiver Propagation Delay
Skew,
|
t
PLHR
- t
PHLR
|
t
PLHR
t
PHLR
t
SKR
V
CC
= 5V, C
L
= 50pF
V
CC
= 5V, C
L
= 50pF
V
CC
= 5V, C
L
= 50pF
C
L
= 150pF to
2500pF
C
L
= 50pF to
1000pF
120
4.0
0.4
Guaranteed Data Rate
DR
V
CC
= 5V, V
DD
= 12V,
V
SS
= -12V, R
L
= 3kΩ to 7kΩ
kbps
230
_______________________________________________________________________________________
3
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
MAX1406
__________________________________________Typical Operating Characteristics
(V
CC
= +5.0V, V
DD
= +12.0V, V
SS
= -12.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1406 TOC-1
SUPPLY CURRENT
vs. LOAD CAPACITANCE
20
SUPPLY CURRENT (mA)
15
10
5
0
-5
-10
-15
-20
-25
I
CC
I
DD,
240kbps
I
DD,
120kbps
I
DD,
20kbps
3kΩ + C
L
1 TRANSMITTER AT DATA RATE
2 TRANMITTERS AT DATA RATE/16
I
SS,
20kbps
I
SS,
120kbps
I
SS,
240kbps
0
1000
2000
3000
4000
5000
MAX1406 TOC-2
MAX1406 TOC-3
20
15
SUPPLY CURRENT (mA)
10
5
0
-5
-10
-15
I
DD,
240kbps
I
DD,
120kbps
I
DD,
20kbps
I
CC
1 TRANSMITTER AT DATA RATE
2 TRANMITTERS AT DATA RATE/16
3kΩ + 2500pF LOAD
25
I
SS,
20kbps
I
SS,
120kbps
I
SS,
240kbps
-20
10.8
11.4
12.0
12.6
13.2
SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
SLEW RATE
vs. LOAD CAPACITANCE
MAX1406 TOC-4
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
12.5
TRANSMITTER OUTPUT VOLTAGE (V)
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
120kbps
1 TRANSMITTER AT DATA RATE
2 TRANMITTERS AT DATA RATE/16
3kΩ + C
L
LOAD
240kbps
120kbps
240kbps
16
14
12
SLEW RATE (V/µs)
10
8
6
4
2
0
0
1000
2000
3000
4000
1 TRANSMITTER AT DATA RATE
2 TRANMITTERS AT DATA RATE/16
3kΩ + C
L
LOAD
RISE
FALL
-10.0
-12.5
0
1000
2000
3000
5000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
______________________________________________________________Pin Description
PIN
1
3, 5, 7
2, 4, 6
8
9
10, 12, 14
11, 13, 15
16
NAME
V
DD
T1OUT, T2OUT,T3OUT
R1IN, R2IN, R3IN
V
SS
GND
T3IN, T2IN, T1IN
R3OUT, R2OUT, R1OUT
V
CC
FUNCTION
Supply-Voltage Input, +10.8V to +13.2V
Transmitter Outputs, swing between V
DD
and V
SS
Receiver Inputs
Supply-Voltage Input, -10.8V to -13.2V
Ground. Connect to system ground.
Transmitter Inputs. Tie unused inputs to GND or V
CC.
Receiver Outputs, swing between GND and V
CC
Supply-Voltage Input, +4.5V to +5.5V
MAX1406
3.0V
DRIVER
INPUT
0V
1.5V
t
PHL
t
PLH
V
OH
3.3V
3.0V
V
OUT
-3.0V
-3.3V
0V
When the power is off, the MAX1406 outputs are permit-
ted to be driven up to ±15V. The transmitter inputs do
not have internal pull-up resistors. Connect unused
inputs to GND or V
CC
.
RS-232 Receivers
The receiver inputs invert and convert the RS-232 sig-
nals to CMOS-logic output levels. The MAX1406 has
hysteresis of 650mV. The receiver output swings
between GND and V
CC.
±15kV ESD Protection
As with all Maxim devices, electrostatic discharge
(ESD) protection structures are incorporated on all pins
to protect against ESD encountered during handling
and assembly. The MAX1406 driver outputs and receiv-
er inputs have extra protection against static electricity
found in normal operation. Maxim’s engineers devel-
oped state-of-the-art structures to protect these pins
against ±15kV ESD without damage. After an ESD
event, the MAX1406 continues working without latchup.
ESD protection can be tested in several ways. The
transmitter outputs and the receiver inputs are charac-
terized for protection to the following:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge method specified
in IEC1000-4-2 (formerly IEC801-2)
3) ±15kV using the Air-Gap Discharge method speci-
fied in IEC1000-4-2 (formerly IEC801-2)
t
F2
t
F1
t
R2
V
OL
t
R1
SIGNAL
GENERATOR
R
L
C
L
Figure 1. Slew-Rate Test Circuit and Timing Diagram
_______________Detailed Description
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic input levels to an EIA/TIA-232 voltage
between ±5V and ±13.2V, into a load between 3kΩ and
7kΩ. The MAX1406 guarantees a 230kbps data rate
with a worst-case load of 3kΩ and 1000pF, providing
compatibility with PC-to-PC communication software.
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
_______________________________________________________________________________________
5
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