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PDF MAX1489E Data sheet ( Hoja de datos )
| Número de pieza | MAX1489E | |
| Descripción | 15kV ESD-Protected / Quad / Low-Power RS-232 Line Receiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0426; Rev 1; 2/03
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
_______________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 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.
________________________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 350µA 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
______________Ordering Information
PART
TEMP RANGE
MAX1489ECPD
0°C to +70°C
MAX1489ECSD
0°C to +70°C
MAX1489EC/D
0°C to +70°C
MAX1489EEPD -40°C to +85°C
MAX1489EESD -40°C to +85°C
* Dice are specified at TA = +25°C.
PIN-PACKAGE
14 Plastic DIP
14 SO
Dice*
14 Plastic DIP
14 SO
__________Typical Operating Circuit __________________Pin Configuration
1⁄4 MAX1488E
1⁄4 MAX1489E
TTL/CMOS
LOGIC
INTERCONNECTING
CABLE
TTL/CMOS
LOGIC
1⁄4 MAX1489E
1⁄4 MAX1488E
SIGNAL GROUND
PC
MOTHERBOARD
(DTE)
MODEM
(DCE)
TOP VIEW
INPUT A 1
N.C. 2
OUTPUT A 3
INPUT B 4
N.C. 5
OUTPUT B 6
GND 7
MAX1489E
14 VCC
13 INPUT D
12 N.C.
11 OUTPUT D
10 INPUT C
9 N.C.
8 OUTPUT C
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
RC 50MΩ to 100MΩ RD 330Ω
CHARGE-CURRENT DISCHARGE
LIMIT RESISTOR RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 3a. IEC1000-4-2 ESD Test Model
I
100%
90%
10%
tr = 0.7ns to 1ns
30ns
60ns
t
Figure 3b. IEC1000-4-2 ESD Generator 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. VCC must be
bypassed with 0.1µF capacitors as close to the part as
possible to ensure maximum ESD protection.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX1489E.PDF ] | |
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