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Chapter 6 Electrical Data 25

23802E—September 2000 AMD Duron™ Processor Data Sheet

Preliminary Information

6.11 AMD System Bus AC and DC Characteristics

Table 12 shows the DC characteristics of the AMD system bus

used by the AMD Duron processor.

Table 12. AMD System Bus DC Characteristics

Symbol Parameter Condition Min Max Units Notes

REF

DC Input Reference Voltage

(0.5*VCC_CORE)

–50

(0.5*VCC_CORE)

+50

mV 1

VREF_LEAK_P

REF

Tristate Leakage Pullup V

= V

REF

Nominal

–100

µA

VREF_LEAK_N

REF

Tristate Leakage Pulldown V

= V

REF

Nominal

+100

µA

Input High Voltage

REF

+ 200

VCC_CORE +

500

Input Low Voltage –500

REF

– 200

Output High Voltage

OUT

= –200µA

0.85*VCC_CORE VCC_CORE+500 mV 2

Output Low Voltage

OUT

= 1 mA

–500 400 mV 2

LEAK_P

Tristate Leakage Pullup

= VSS (Ground)

–1mA

LEAK_N

Tristate Leakage Pulldown

= VCC_CORE

Nominal

+1 mA

Input Pin Capacitance 4 12 pF 3

Notes:

1. V

REF

– V

REF

is nominally set by a (1%) resistor divider from VCC_CORE.

– The suggested divider resistor values are 100 ohms over 100 ohms to produce a divisor of 0.50.

– Example: VCC_CORE = 1.75V, V

REF

= 850mV (1.7 * 0.50). (Processor pin SysVrefMode = Low)

– Peak-to-Peak AC noise on V

REF

(AC) should not exceed 2% of V

REF

(DC).

2. Specified at T = 90°C and VCC_CORE

3. The following processor inputs have twice the listed capacitance because they connect to two input pads— SYSCLK, and SYSCLK#.

SYSCLK connects to CLKIN/RSTCLK. SYSCLK# connects to CLKIN#/RSTCLK#. For more information, see Table 18 on page 43 .

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 83 84

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