_______________General Description
The 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 350A.
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.
________________________Applications
PC 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
____________________________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
Low 350A Supply Current
o
Input Hysteresis and Time-Domain Filtering
Eliminate the Need for External Filtering
o
Stable Input Thresholds
o
Pin Compatible with MC1489, MC14C89, SN75189,
SN75C189, DS1489, and DS14C89
MAX1489E
15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
________________________________________________________________
Maxim Integrated Products
1
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V
CC
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 Configuration
INTERCONNECTING
CABLE
SIGNAL GROUND
TTL/CMOS
LOGIC
PC
MOTHERBOARD
(DTE)
MODEM
(DCE)
TTL/CMOS
LOGIC
1
/
4
MAX1488E
1
/
4
MAX1489E
1
/
4
MAX1489E
1
/
4
MAX1488E
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0426; Rev 0; 8/95
PART
MAX1489ECPD
MAX1489ECSD
MAX1489EC/D
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
14 Plastic DIP
14 SO
Dice*
______________Ordering Information
* Dice are specified at T
A
= +25C.
MAX1489EEPD
-40C to +85C
14 Plastic DIP
MAX1489EESD
-40C to +85C
14 SO
MAX1489E
15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V 10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 5V, T
A
= +25C.)
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 Characteristics section.
Supply Voltage (V
CC
).............................................................+7V
Input Voltage (V
IN
) ...............................................................30V
Output Short-Circuit Current
(Shorted to GND or V
CC
) (Note 1) ............................Self Limiting
Continuous Power Dissipation (T
A
= +70C)
Plastic DIP (derate 10.00mW/C above +70C) ..........800mW
SO (derate 8.7mW/C above +70C) ...........................695mW
Operating Temperature Ranges
MAX1489EC_D ...................................................0C to +70C
MAX1489EE_D ................................................-40C to +85C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
Pulse amplitude = 5V (Note 2)
V
OUT
= 10% to 90%
Figure 1
Figure 1
Figure 1
V
IN
2.4V, I
OUT
= 3.2mA
Shorted to GND
Shorted to V
CC
CONDITIONS
s
1.0
t
N
Input Noise Rejection
ns
35
120
t
TR
Output Transition Time
ns
70
t
SKEW
Output Propagation Delay Skew,
I
t
PLH
- t
PHL
I
s
1.45
4.0
t
PHL
Output Propagation Delay,
High to Low
s
1.38
4.0
t
PLH
Output Propagation Delay,
Low to High
k
3.0
5.0
7.0
R
IN
Input Resistance
V
1.11
V
HYST
Input Hysteresis
V
0.75
1.06
1.30
V
IL
Input Voltage Low
V
1.60
2.17
2.60
V
IH
Input Voltage High
V
-25
25
V
IN
Input Voltage Range
V
0.17
0.4
V
OL
Output Voltage Low
-35
mA
60
I
OS
Output Short-Circuit Current
(Note 1)
A
260
600
I
CC
Supply Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
kbps
120
240
DR
Guaranteed Data Rate
Human Body Model
kV
15
IEC1000-4-2 (Contact Discharge)
8
IEC1000-4-2 (Air-Gap Discharge)
15
ESD Protection
V
IN
0.4V
I
OUT
= -3.2mA
I
OUT
= -20A
V
2.5
4.41
V
OH
Output Voltage High
3.5
4.99
DC CHARACTERISTICS
TIMING CHARACTERISTICS
ESD CHARACTERISTICS
MAX1489E
15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
_______________________________________________________________________________________
3
0.6
-40
PROPAGATION DELAY vs. TEMPERATURE
1.0
MAX1489E-01
TEMPERATURE (C)
PROPAGATION DELAY (
s)
60
1.8
1.4
-15
35
85
2.2
10
t
PHL
t
PLH
0
-40
PROPAGATION DELAY SKEW
vs. TEMPERATURE
200
MAX1489E-02
TEMPERATURE (C)
PROPAGATION DELAY SKEW (ns)
60
600
400
-15
35
85
800
10
V
CC
= 5V
V
CC
= 5.25V
V
CC
= 4.75V
0
0.7
NOISE PULSE REJECTION
2
MAX1489E-03
INPUT PULSE WIDTH (
s)
INPUT PULSE AMPLITUDE (Vp-p)
2.3
6
4
1.1
1.9
2.7
8
1.5
V
IN
= (V
IL
+ V
IH
) PULSE AMP,
2 2
f = 300kHz
NAME
FUNCTION
1, 4, 10,
13
INPUT_
Receiver Inputs
2, 5, 9,
12
N.C.
No Connect--not internally
connected
PIN
3, 6, 8,
11
OUTPUT_
Receiver Outputs
7
GND
Ground
_____________________Pin Description
14
V
CC
Supply Voltage
__________________________________________Typical Operating Characteristics
(V
CC
= 5V, T
A
= +25C, unless otherwise noted.)
t
PHL
t
PLH
t
TR
t
TR
1.5V
3.0V
0V
S.G.
V
OUT
V
OH
V
OL
10%
50%
50%
50pF
V
OUT
V
CC
SIGNAL
GENERATOR
(S.G.)
90%
NOTE: S.G. SET TO f = 20kHz;
DUTY CYCLE = 50%;
t
R
, t
F
< 5.0ns
Figure 1. Timing Diagram
MAX1489E
_______________Detailed Description
15kV ESD Protection
As 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:
1) 15kV using the Human Body Model
2) 8kV using the Contact Discharge method speci-
fied in IEC1000-4-2 (formerly IEC801-2)
3) 15kV using the Air-Gap Discharge method speci-
fied in IEC1000-4-2 (formerly IEC801-2).
ESD Test 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 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 1.5k
resistor.
IEC1000-4-2
The 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 Receiver
4
_______________________________________________________________________________________
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
R
C
1M
R
D
1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
Figure 2a. Human Body ESD Test Model
Figure 2b. Human Body Model Current Waveform
Machine Model
The 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 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 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. V
CC
must be
bypassed with 0.1F capacitors as close to the part as
possible to ensure maximum ESD protection.
MAX1489E
15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
_______________________________________________________________________________________
5
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
R
C
50M to 100M
R
D
330
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
t
r
= 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 3a. IEC1000-4-2 ESD Test Model
Figure 3b. IEC1000-4-2 ESD Generator Current Waveform
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