VSC7440 datasheet(442/444 Pages) MICROSEMI

Part #	VSC7440

Description	L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links

PDF	444 Pages

Scroll/Zoom	100%

Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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442 / 444 page

Design Guidelines

VMDS-10492 VSC7440 Datasheet Revision 4.2

425

•

Place the external temperature monitor as close as is possible to this device.

•

Add a 47

Ω resistor in series with the external temperature monitor supply to filter noise.

•

When using a grounded sensor circuit, place a de-coupling capacitor between the external

temperature monitor supply pin and the THERMDC signal. For more information about using a

grounded sensor circuit, see Figure 133, page 376.

Place the capacitor close to the external temperature sensor, as shown in the following illustration.

Connect the external temperature monitor VSS pin directly to the THERMDC pin, which has the

connection to VSS, as shown in the following illustration. Do not connect the external temperature

monitor VSS pin to the global VSS plane.

Figure 156 •

External Temperature Monitor Connection

Supply

External

Temperature

Monitor

Sense

Switch

VDD

VSS

THERMDA

THERMDC

Data Bus

VSC7440 Datasheet(PDF) 442 Page - Microsemi Corporation