PACDN017 datasheet(3/3 Pages) CALMIRCO

Part #	PACDN017

Description	18 CHANNEL ESD PROTECTION ARRAY WITH ZENER SUPPLY CLAMP

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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CALIFORNIA MICRO DEVICES

PAC DN017

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

Similarly for negative ESD pulses, parasitic series inductance from the VN pin to the ground rail will lead to drastically

increased negative voltage on the line being protected.

Another consideration is the output impedance of the power supply for fast transient currents. Most power supplies

exhibit a much higher output impedance to fast transient current spikes. In the VZ equation above, the VSupply term, in

reality, is given by (VDC + Iesd x Rout), where VDC and Rout are the nominal supply DC output voltage and effective output

impedance of the power supply respectively. As an example, a Routof 1 ohm would result in a 10V increment in VZ for a

peak Iesd of 10A.

To mitigate these effects, a Zener diode has been integrated into this Protection Array between VP and VN. This Zener

diode clamps the maximum voltage of VP relative to VN at the breakdown voltage of the Zener diode. Although not strictly

necessary, it is recommended that VP be bypassed to the ground plane with a high frequency bypass capacitor. This will

lower the channel clamp voltage, and is especially effective when VP is much lower than the Zener breakdown voltage.

The value of this bypass capacitor should be chosen such that it will absorb the charge transferred by the ESD pulse with

minimal change in VP. Typically a value in the 0.1 µF to 0.2 µF range is adequate for IEC-61000-4-2 level 4 contact

discharge protection (8KV). For higher ESD voltages, the bypass capacitor should be increased accordingly. Ceramic chip

capacitors mounted with short printed circuit board traces are good choices for this application. Electrolytic capacitors

should be avoided as they have poor high frequency characteristics.

As a general rule, the ESD Protection Array should be located as close as possible to the point of entry of expected

electrostatic discharges. The power supply bypass capacitor mentioned above should be as close to the VP pin of the

Protection Array as possible, with minimum PCB trace lengths to the power supply and ground planes to minimize stray

series inductance.

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