MAX14840EASA+ Maxim Integrated Products, MAX14840EASA+ Datasheet - Page 14

• Manufacturer Part Number: MAX14840EASA+
• Description: TXRX 40MBPS RS485/RS422 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX14840EASA+

• Number Of Drivers/receivers: 1/1
• Protocol: RS485
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Supply Voltage: 3.3 V
• Supply Current: 1.5 mA
• Operating Temperature Range: - 40 C to + 125 C
• Data Rate: 40 Mbps
• Mounting Style: SMD/SMT
• Propagation Delay Time Ns: 12 ns
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

40Mbps, +3.3V, RS-485 Half-Duplex
Transceivers
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Figure 11 shows the HBM, and Figure 12 shows the
current waveform it generates when discharged into a
low-impedance state. This model consists of a 100pF
capacitor charged to the ESD voltage of interest, which
is then discharged into the test device through a 1.5kI
resistor.
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The MAX14840E/
MAX14841E family of devices helps you design equip-
ment to meet IEC 61000-4-2, without the need for addi-
tional ESD protection components.
Figure 11. Human Body ESD Test Model
Figure 12. Human Body current Waveform
14
AMPERES
_____________________________________________________________________________________
VOLTAGE
SOURCE
I
HIGH-
P
36.8%
DC
100%
90%
10%
0
CHARGE CURRENT
LIMIT RESISTOR
0
t
RL
1MI
R
100pF
C
C
S
CURRENT WAVEFORM
TIME
STORAGE
CAPACITOR
RESISTANCE
DISCHARGE
1.5kI
R
t
ESD Test Conditions
D
DL
Human Body Model
I
R
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IEC 61000-4-2
DEVICE
UNDER
TEST
The major difference between tests done using the HBM
and IEC 61000-4-2 is higher peak current in IEC 61000-4-2
because series resistance is lower in the IEC 61000-4-2
model. Hence, the ESD withstand voltage measured to
IEC 61000-4-2 is generally lower than that measured
using the HBM.
Figure 13 shows the IEC 61000-4-2 model, and
Figure 14 shows the current waveform for IEC 61000-4-2
ESD Contact Discharge test.
The MAX14840E and MAX14841E are high-performance
RS-485 transceivers supporting data rates up to 40Mbps.
Two mechanisms prevent excessive output current
and power dissipation caused by faults or by bus
contention. Current limit on the output stage provides
Figure 13. IEC 61000-4-2 ESD Test Model
Figure 14. IEC 61000-4-2 ESD Generator Current Waveform
t
VOLTAGE
R
SOURCE
HIGH-
= 0.7ns TO 1ns
DC
CHARGE CURRENT
100%
LIMIT RESISTOR
90%
10%
50M Ω TO 100M Ω
I
Applications Information
R
C
150pF
C
s
30ns
Driver Output Protection
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
330 Ω
High-Speed Operation
R
60ns
D
DEVICE
UNDER
TEST
t