AMD 8 manual AMD Athlon System Bus DC Characteristics, Preliminary Information, Electrical Data

Preliminary Information

AMD Athlon™ XP Processor Model 8 Data Sheet 25175H— March 2003

8.10AMD Athlon™ System Bus DC Characteristics

Table 15 shows the DC characteristics of the AMD Athlon system bus used by the AMD Athlon XP processor model 8.

Table 15. AMD Athlon™ System Bus DC Characteristics

Symbol	Parameter	Condition	Min	Max	Units	Notes
VREF	DC Input Reference Voltage		(0.5 x VCC_CORE)	(0.5 x VCC_CORE)	mV	1
			–50	+50
IVREF_LEAK_P	VREF Tristate Leakage Pullup	VIN = VREF Nominal	–100		∝A
IVREF_LEAK_N	VREF Tristate Leakage Pulldown	VIN = VREF Nominal		100	∝A
VIH	Input High Voltage		VREF + 200	VCC_CORE + 500	mV
VIL	Input Low Voltage		–500	VREF – 200	mV
ILEAK_P	Tristate Leakage Pullup	VIN = VSS	–1		mA
		(Ground)
ILEAK_N	Tristate Leakage Pulldown	VIN = VCC_CORE		1	mA
		Nominal
CIN	Input Pin Capacitance		4	7	pF
RON	Output Resistance		0.90 x RsetN,P	1.1 x RsetN,P	Ω	2
RsetP	Impedance Set Point, P Channel		40	70	Ω	2
RsetN	Impedance Set Point, N Channel		40	70	Ω	2

Notes:

1. VREF is nominally set to 50% of VCC_CORE with actual values that are specific to motherboard design implementation. VREF must be created with a sufficiently accurate DC source and a sufficiently quiet AC response to adhere to the ± 50 mV specification listed

above.

2. Measured at VCC_CORE / 2.

38 Electrical Data Chapter 8