TRS3243E_08 Datasheet, PDF (13/26 Pages) Texas Instruments – 3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV IEC ESD PROTECTION

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TRS3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV IEC ESD PROTECTION
SLLS789 – APRIL 2007
APPLICATION INFORMATION
ESD Protection
TI TRS3243E devices have standard ESD protection structures incorporated on the pins to protect against
electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver
outputs and receiver inputs) of these devices have an extra level of ESD protection. Advanced ESD structures
were designed to successfully protect these bus pins against ESD discharge of ±15-kV in all states: normal
operation, shutdown, and powered down. The TRS3243E devices are designed to continue functioning properly
after an ESD occurrence without any latchup.
The TRS3243E devices have three specified ESD limits on the driver outputs and receiver inputs, with respect
to GND:
• ±15-kV Human-Body Model (HBM)
• ±15-kV IEC61000-4-2, Air-Gap Discharge (formerly IEC1000-4-2)
• ±8-kV IEC61000-4-2, Contact Discharge
ESD Test Conditions
ESD testing is stringently performed by TI, based on various conditions and procedures. Please contact TI for a
reliability report that documents test setup, methodology, and results.
Human-Body Model (HBM)
The HBM of ESD testing is shown in Figure 7, while Figure 8 shows the current waveform that is generated
during a discharge into a low impedance. The model consists of a 100-pF capacitor, charged to the ESD voltage
of concern, and subsequently discharged into the DUT through a 1.5-kΩ resistor.
R_D
1.5 kΩ
V_HBM
+
−
C_S
100 pF
DUT
Figure 7. HBM ESD Test Circuit
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