Intel manual Circuit Implementations, 10.1 41210 Bridge Analog Voltage Filters, Config

Circuit Implementations 10

This chapter describes 41210 Bridge circuit implementations.

10.141210 Bridge Analog Voltage Filters

The Intel® 41210 Serial to Parallel PCI Bridge requires several external analog voltage filter circuits to be placed on the system board, three for the PCI interface, one for the PCI Express interface, and one for the bandgap voltage. The 41210 Bridge lists the recommended filter values for these filter circuits -- any one of the filter circuits can use any one of the four R, L and C combinations shown in Table 16, except that configuration number 4 cannot be used for the PCI Express analog voltage filter.

Table 16. Recommended R, L and C Values for 41210 Bridge Analog Filter Circuits

Config		R	L	C
	0.5Ω	±1%	4.7uH ±25%	33uF ±20%
1			PCI, PCI-E: 45mA
	1/16W			6.3V
			Bandgap: 30mA
	0.5Ω	±1%	4.7uH ±20	22uF ±20%
2			PCI, PCI-E: 45mA
	1/16W			6.3V
			Bandgap: 30mA%
	0.5Ω	±1%	4.7uH ±20%	2x10uF ±20%
3			PCI, PCI-E: 45mA
	1/16W			6.3V
			Bandgap: 30mA
	1.0Ω	±1%	4.7uH ±20%	10uF ±20%
4a			PCI: 45mA
	1/16W			6.3V
			Bandgap: 30mA

a.Configuration number 4 cannot be used for the PCI Express analog voltage filter.

Additional notes:

L(Inductor)

—L must be magnetically shielded

—ESR: max < 0.4Ω

—rated at 45mA (or 30mA for bandgap circuit only)

C(Capacitor)

—ESR: max < 0.5Ω

—ESL < 3.0nH

R(Resistor)

—1/16W

Intel® 41210 Serial to Parallel PCI Bridge Design Guide 49