MAX3483ECSA+ Maxim, MAX3483ECSA+ Datasheet - Page 14

• Manufacturer Part Number: MAX3483ECSA+
• Description: Transceiver; RS-485/RS-422; 2 V (Min.) (Input High), 0.8 V (Max.) (Input Low)
• Manufacturer: Maxim

Specifications of MAX3483ECSA+

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
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.
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused
when I/O pins are contacted by handling equipment
during test and assembly. Of course, all pins require
this protection, not just RS-485 inputs and outputs.
Figure 22a. Human Body ESD Test Model
Figure 23a. IEC 1000-4-2 ESD Test Model
14
VOLTAGE
VOLTAGE
SOURCE
SOURCE
HIGH-
HIGH-
DC
DC
______________________________________________________________________________________
CHARGE-CURRENT
CHARGE-CURRENT
LIMIT RESISTOR
LIMIT RESISTOR
50M to 100M
R
1M
R
C
C
100pF
150pF
C s
C s
STORAGE
CAPACITOR
STORAGE
CAPACITOR
1500
RESISTANCE
RESISTANCE
DISCHARGE
DISCHARGE
330
R
R
D
D
Machine Model
DEVICE
UNDER
DEVICE
UNDER
TEST
TEST
The MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E transceivers are designed for
bidirectional data communications on multipoint bus
transmission lines. Figures 24 and 25 show typical net-
work applications circuits. These parts can also be
used as line repeaters, with cable lengths longer than
4000 feet, as shown in Figure 21.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as
possible. The slew-rate-limited MAX3483E/MAX3488E
and the partially slew-rate-limited MAX3486E are more
tolerant of imperfect termination.
Figure 22b. Human Body Current Waveform
Figure 23b. IEC 1000-4-2 ESD Generator Current Waveform
AMPERES
t r = 0.7ns to 1ns
I
P
36.8%
100%
90%
10%
100%
90%
10%
0
0
I
t
RL
30ns
CURRENT WAVEFORM
TIME
60ns
t
Typical Applications
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
t