CM1234 Datasheet, PDF (3/13 Pages) California Micro Devices Corp – PicoGuard XSTM ESD Clamp Array For High Speed Data Line Protection

CM1234
In the CM1234 PicoGuard XS architecture, the signal line leading the connector to the ASIC routes through the
CM1234 chip which provides 100Ω matched differential channel characteristic impedance that helps optimize
100Ω load impedance applications such as the HDMI high speed data lines.
Note:When each of the channels are used individually for single-ended signal lines protection, the individual
channel provides 50Ω characteristic impedance matching.
The load impedance matching feature of the CM1234 helps to simplify system designer’s PCB layout
considerations in impedance matching and also eliminates associated passive components.
The route through the PicoGuard XS architecture enables the CM1234 to provide matched impedance for the
signal path between the connector and the ASIC. Besides this function, this circuit arrangement also changes the
way the parasitic inductance interacts with the ESD protection circuit and helps reduce the I_RESIDUAL current to the
ASIC.
Figure 1. Standard ESD Protection Device Block Diagram
Rev. 3 | Page 3 of 13 | www.onsemi.com