7.2.2 Detailed Design Procedure

7.2.2.1 Signal Range

The ESDS314 has 4 identical surge protection channels with each channel supporting a signal range of 0 to

3.6V. The device will work well with any Ethernet PHY that drives the single ended voltage on the data line up to

a 3.6V.

7.2.2.2 Operating Frequency

The ESDS314 has a capacitance of 4.5pF (typical) and can support the 125MHz operation of Ethernet

1000Base-T application

7.2.3 Application Curves

D012_S21.grf

Frequency (GHz)

0.1

0.2

0.3

0.4 0.5 0.60.7

1

2

-12

-11

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

D012

Figure 7-2. Differential Insertion Loss vs. Frequency

7.3 Power Supply Recommendations

The ESDS314, ESDS312 devices are passive ESD devices and there is no need to power it. Take care not to

violate the recommended I/O specification (0 V to 3.6 V) to ensure the device functions properly.

7.4 Layout

7.4.1 Layout Guidelines

• The optimum placement is as close to the connector as possible.

– EMI during an ESD event can couple from the trace being struck to other nearby unprotected traces,

resulting in early system failures.

– The PCB designer must minimize the possibility of EMI coupling by keeping any unprotected traces away

from the protected traces which are between the TVS and the connector.

• Route the protected traces as straight as possible.

• Eliminate any sharp corners on the protected traces between the TVS and the connector by using rounded

corners with the largest radii possible.

– Electric fields tend to build up on corners, increasing EMI coupling.

ESDS311, ESDS312, ESDS314

SLVSEG9C – MAY 2018 – REVISED FEBRUARY 2024

www.ti.com

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