MAX1489ECSD+ ,±15kV ESD-Protected, Quad, Low-Power RS-232 Line ReceiverApplicationsPC Motherboards______________Ordering InformationModemsInterfacing Data Terminal Equipm ..
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MAX1489EEPD ,15kV ESD-Protected / Quad / Low-Power RS-232 Line ReceiverFeaturesThe MAX1489E quad, low-power line receiver is' Enhanced ESD Protection:designed for EIA/TIA ..
MAX1489EEPD ,15kV ESD-Protected / Quad / Low-Power RS-232 Line ReceiverMAX1489E19-0426; Rev 0; 8/95±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver_______________
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MAX1489ECSD+-MAX1489EEPD+-MAX1489EESD+
±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver
_______________General DescriptionThe MAX1489E quad, low-power line receiver is
designed for EIA/TIA-232, EIA/TIA-562, and CCITT V.28
communications in harsh environments. Each receiver
input is protected against ±15kV electrostatic dis-
charge (ESD) shocks. These inputs have a ±25V range
and feature hysteresis and time-domain filtering. The
outputs are TTL and CMOS compatible. The MAX1489E
has a 120kbps guaranteed data rate. Supply current is
typically 350µA.
The MAX1489E is pin compatible with the MC1489,
MC14C89, SN75189, SN75C189, DS1489, and
DS14C89. It is available in 14-pin plastic DIP and SO
packages.
________________________ApplicationsPC Motherboards
Modems
Interfacing Data Terminal Equipment (DTE) with
Data Circuit-Terminating Equipment (DCE)
Equipment Meeting IEC1000-4-2 (formerly
IEC801-2) or ±15kV ESD Protection
____________________________FeaturesEnhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap DischargeLatchup Free During an ESD EventLow 350µA Supply CurrentInput Hysteresis and Time-Domain Filtering
Eliminate the Need for External FilteringStable Input ThresholdsPin Compatible with MC1489, MC14C89, SN75189,
SN75C189, DS1489, and DS14C89
MAX1489E
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line ReceiverVCC
INPUT D
N.C.
OUTPUT D
INPUT C
N.C.
OUTPUT C
INPUT A
N.C.
OUTPUT A
INPUT B
N.C.
OUTPUT B
GND
TOP VIEW
MAX1489E
DIP/SO
__________________Pin ConfigurationINTERCONNECTING
CABLE
SIGNAL GROUND
TTL/CMOS
LOGIC
MOTHERBOARD
(DTE)
MODEM
(DCE)
TTL/CMOS
LOGIC
1⁄4 MAX1488E
1⁄4 MAX1489E⁄4 MAX1489E⁄4 MAX1488E
__________Typical Operating Circuit19-0426; Rev 1; 2/03
PARTMAX1489ECPD
MAX1489ECSD
MAX1489EC/D0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGEPIN-PACKAGE14 Plastic DIP
14 SO
Dice*
______________Ordering Information* Dice are specified at TA= +25°C.
MAX1489EEPD-40°C to +85°C14 Plastic DIP
MAX1489EESD-40°C to +85°C14 SO
MAX1489E
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 5V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= 5V, 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.
Note 1:Only one output may be shorted at a time.
Note 2:See Noise Pulse Rejection graph in Typical Operating Characteristicssection.
Supply Voltage (VCC).............................................................+7V
Input Voltage (VIN)...............................................................±30V
Output Short-Circuit Current
(Shorted to GND or VCC) (Note 1)............................Self Limiting
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 10.00mW/°C above +70°C)..........800mW
SO (derate 8.7mW/°C above +70°C)...........................695mW
Operating Temperature Ranges
MAX1489EC_D...................................................0°C to +70°C
MAX1489EE_D................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Pulse amplitude = 5V (Note 2)
VOUT= 10% to 90%
Figure 1
Figure 1
Figure 1
VIN≥2.4V, IOUT= 3.2mA
Shorted to GND
Shorted to VCC
CONDITIONS1.0tNInput Noise Rejection35120tTROutput Transition Time70tSKEWOutput Propagation Delay Skew,tPLH- tPHLI1.454.0tPHLOutput Propagation Delay,
High to Low1.384.0tPLHOutput Propagation Delay,
Low to High3.05.07.0RINInput Resistance1.11VHYSTInput Hysteresis0.751.061.30VILInput Voltage Low1.602.172.60VIHInput Voltage High-2525VINInput Voltage Range0.170.4VOLOutput Voltage Low
-35mA60IOSOutput Short-Circuit Current
(Note 1)260600ICCSupply Current
UNITSMINTYPMAXSYMBOLPARAMETERkbps120240DRGuaranteed Data Rate
Human Body Model
±15
IEC1000-4-2 (Contact Discharge)±8
IEC1000-4-2 (Air-Gap Discharge)±15
ESD Protection
VIN≤0.4VIOUT= -20µA
IOUT= -3.2mAV2.54.41VOHOutput Voltage High3.54.99
DC CHARACTERISTICS
TIMING CHARACTERISTICS
ESD CHARACTERISTICS
MAX1489E
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line ReceiverPROPAGATION DELAY vs. TEMPERATURE
MAX1489E-01
TEMPERATURE (°C)
PROPAGATION DELAY (
tPHL
tPLH
PROPAGATION DELAY SKEW
vs. TEMPERATURE
MAX1489E-02
TEMPERATURE (°C)
PROPAGATION DELAY SKEW (ns)
VCC = 5V
VCC = 5.25V
VCC = 4.75V
NOISE PULSE REJECTION
MAX1489E-03
INPUT PULSE WIDTH (μs)
INPUT PULSE AMPLITUDE (Vp-p)
VIN = (VIL + VIH) ± PULSE AMP,
2 2
f = 300kHz
NAMEFUNCTION1, 4, 10,INPUT_Receiver Inputs
2, 5, 9,N.C.No Connect—not internally
connected
PIN3, 6, 8,OUTPUT_Receiver OutputsGNDGround
_____________________Pin DescriptionVCCSupply Voltage
__________________________________________Typical Operating Characteristics(VCC= 5V, TA = +25°C, unless otherwise noted.)
tPHLtPLH
tTRtTR
1.5V
3.0V
S.G.
VOUT
VOH
VOL
10%
50%50%
50pFVOUT
VCC
SIGNAL
GENERATOR
(S.G.)
90%
NOTE: S.G. SET TO f = 20kHz;
DUTY CYCLE = 50%;
tR, tF < 5.0ns
Figure 1. Timing Diagram
MAX1489E
_______________Detailed Description
±15kV ESD ProtectionAs with all Maxim devices, ESD protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX1489E 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 ESD of
±15kV without damage. After an ESD event, the
MAX1489E keeps working without latchup.
ESD protection can be tested in various ways; the
receiver inputs are characterized for protection to the
following:±15kV using the Human Body Model±8kV using the Contact Discharge method speci-
fied in IEC1000-4-2 (formerly IEC801-2)±15kV using the Air-Gap Discharge method speci-
fied in IEC1000-4-2 (formerly IEC801-2).
ESD Test ConditionsContact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body ModelFigure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩresistor.
IEC1000-4-2The IEC100-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX1489E helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD protection com-
ponents.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak cur-
rent in IEC1000-4-2. Because series resistance is lower
in the IEC1000-4-2 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
IEC1000-4-2 Level 4 ESD Contact Discharge test.
The Air-Gap test involves approaching the device with a
charged probe. The Contact Discharge method connects
the probe to the device before the probe is energized.
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line ReceiverCHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
100pF
RC 1MΩRD 1500Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRLTIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
10%
AMPERES
Figure 2a.Human Body ESDTest ModelFigure 2b.Human Body Model Current Waveform
Machine ModelThe Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. Its objec-
tive is to mimic the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. Of course, all pins (not just RS-232 inputs and out-
puts) require this protection during manufacturing.
Therefore, the Machine Model is less relevant to the I/O
ports than the Human Body Model and IEC1000-4-2.
__________Applications InformationUse proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass through the
ground pin, so it is important to minimize the ground-
lead return path to the power supply. A separate return
path to the power supply is recommended. Trace
widths should be greater than 40 mils. VCCmust be
bypassed with 0.1µF capacitors as close to the part as
possible to ensure maximum ESD protection.
MAX1489E
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line ReceiverCHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
150pF
RC 50MΩ to 100MΩRD 330Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
tr = 0.7ns to 1ns30ns
60ns
100%
90%
10%
IPEAK
Figure 3a.IEC1000-4-2 ESDTest ModelFigure 3b.IEC1000-4-2 ESDGenerator Current Waveform
MAX1489E
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
___________________Chip TopographyTRANSISTOR COUNT: 144
SUBSTRATE CONNECTED TO GND
INPUT D
OUTPUT B
0.096"
(2.438mm)
0.071"
(1.803mm)
GND
OUTPUT D
INPUT C
OUTPUT C
VCC
INPUT B
OUTPUT A
INPUT A
