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SP385EEA Datasheet(PDF) 7 Page - Sipex Corporation

Part # SP385EEA
Description  Enhanced 3V or 5V RS-232 Line Driver/Receiver
Download  11 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP385EEA Datasheet(HTML) 7 Page - Sipex Corporation

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Date: 03/08/05
SP385E Enhanced +3V to +5V RS-232 Line Driver/Receiver
© Copyright 2005 Sipex Corporation
7
Shutdown (ON/OFF)
The SP385E has a shut-down/standby mode to
conserve power in battery-powered systems. To
activate the shutdown mode, which stops the
operation of the charge pump, a logic "0" is
applied to the appropriate control line. The
shutdown mode is controlled on the SP385E by
a logic "0" on the ON/OFF control line (pin 18
for the SOIC and pin 20 for the SSOP packages);
this puts the transmitter outputs in a tri-state mode.
ESD Tolerance
The SP385E device incorporates ruggedized
ESD cells on all driver output and receiver input
pins. The ESD structure is improved over our
previous family for more rugged applications
and environments sensitive to electro-static
discharges and associated transients. The
improved ESD tolerance is at least
±15KV with-
out damage nor latch-up.
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7
b) IEC1000-4-2 Air-Discharge
c) IEC1000-4-2 Direct Contact
The Human Body Model has been the generally
accepted ESD testing method for semiconductors.
This method is also specified in MIL-STD-883,
Method 3015.7 for ESD testing. The premise of
this ESD test is to simulate the human body’s
potential to store electro-static energy and
discharge it to an integrated circuit.
The
simulation is performed by using a test model as
shown in Figure 6. This method will test the IC’s
capability to withstand an ESD transient during
normal handling such as in manufacturing areas
where the ICs tend to be handled frequently.
The IEC-1000-4-2, formerly IEC801-2, is
generally used for testing ESD on equipment and
systems. For system manufacturers, they must
guarantee a certain amount of ESD protection
since the system itself is exposed to the outside
environment and human presence. The premise
with IEC1000-4-2 is that the system is required
to withstand an amount of static electricity when
ESD is applied to points and surfaces of the
equipment that are accessible to personnel during
normal usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC1000-4-2 is shown on Figure 7. There are
two methods within IEC1000-4-2, the Air
Discharge method and the Contact Discharge
method.
Figure 4. Charge Pump — Phase 3
VCC = +5V
–5V
+5V
–5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
+
++
Figure 5. Charge Pump — Phase 4
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
+
++
Figure 6. ESD Test Circuit for Human Body Model
RC
CS
RS
SW1
SW2
RC
Device
Under
Test
DC Power
Source
CS
RS
SW1
SW2
Figure 7. ESD Test Circuit for IEC1000-4-2
RS and RV add up to 330Ω for IEC1000-4-2.
RS and RV add up to 330Ω for IEC1000-4-2.
Contact-Discharge Module
RV
RC
CS
RS
SW1
SW2
RC
Device
Under
Test
DC Power
Source
CS
RS
SW1
SW2
RV
Contact-Discharge Module


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