CM1234 Datasheet, PDF (8/10 Pages) California Micro Devices Corp – PicoGuard XSTM ESD Clamp Array For High Speed Data Line Protection

Issue X-2
CM1234
Application Information
CM1234 Application and Guidelines
As a general rule, the CM1234 ESD protection array should be located as close as possible to the point of entry of
expected electrostatic discharges with minimum PCB trace lengths to the ground planes and between the signal
input and the ESD device to minimize stray series inductance.
Path of ESD
current pulse
(IESD)
Channel
Output
CM1234
Line Being
Protected
Channel
Input
VCL
V_CC
Circuitry Under
Protection
V_N
Ground Rail
Figure 7. Application of Positive ESD Pulse Between Input Channel and Ground
Figure 8. Typical PCB Layout
Additional Information
See also California Micro Devices Application Note AP209, “Design Considerations for ESD Protection,” in the
Applications section at www.calmicro.com.
© 2008 California Micro Devices Corp. All rights reserved.
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490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: [phone] ● Fax: [phone] ● www.cmd.com 4/24/2008