845GL datasheet(152/193 Pages) INTEL

152 / 193 page

Electrical Characteristics

152

Intel® 82845G/82845GL/82845GV GMCH Datasheet

NOTES:

1. Crossing voltage is defined as the instantaneous voltage value when the rising edge of HCLKP equals the

falling edge of HCLKN.

2. VIH(Ave) is the statistical average of the VIH measured by the oscilloscope.

3. VIH(Ave) can be measured directly using “Vtop” on Agilent* scopes and “High” on Tektronix* scopes.

4. The crossing point must meet the absolute and relative crossing point specifications simultaneously.

5. VCross(Rel) Maximum = 0.250+0.5(VIH(Ave)–0.71); VCross(Rel) Minimum = 0.550+0.5(VIH(Ave)–0.71). See

Figure 6-1.

3.3V SDR System Memory: Functional Operating Range (VCC=3.3V

±5%)

VIL_SDR

(p,r)

Input Low Voltage

SMVREF

(SDR)–0.350

VIH_SDR

(p,r)

Input High Voltage

SMVREF

(SDR)+0.350

VOL_SDR

(p,q)

Output Low Voltage

0.4

VOH_SDR

(p,q)

Output High Voltage

2.4

IOL_SDR

(p,q)

Output Low Current

mA @VOL_SDR max

IOH_SDR

(p,q)

Output High Current

-4

mA @VOH_SDR max

ILEAK_SDR

(p,r)

Input Leakage Current

±10

µA

0<Vin<

VCCSM(SDR)

CIN_SDR

(p,r)

Input Capacitance

5.5

FC=1 MHz

3.3V Synchronization signals: Functional Operating Range (VCC=3.3V

±5%)

VIH

(t)

Output High Voltage

2.4

3.465

VIL

(t)

Output Low Voltage

0.0

0.5

IOH

(t)

Output High Current

-8

IOL

(t)

Output Low Current

Clocks and Miscellaneous Signals

VIL

(y)

3.3 V CMOS Input Low Voltage

0.8

VIH

(y)

3.3 V CMOS Input High Voltage

2.0

VOL

(y)

3.3 V CMOS Output Low Voltage

0.4

VOH

(y)

3.3 V CMOS Output High Voltage

2.4

IOL

(y)

3.3 V CMOS Output Low Current

mA @VOL max

IOH

(y)

3.3 V CMOS Output High Current

-4

mA @VOH min

ILEAK

(y)

3.3 V CMOS Input Leakage Current

±10

µA 0<Vin<VCC3

CIN

(y)

3.3 V CMOS Input Capacitance

5.5

FC=1 MHz

VCross(Abs)

(j)

Absolute Crossing Voltage

0.250

0.550

1,2,4,5

VCross(Rel)

(j)

Relative Crossing Voltage

Note 5

1,2,3,4,5

Table 6-6.

DC Characteristics (Sheet 2 of 2)

Symbol

Signal

Group

Parameter

Min

Nom

Max

Unit

Notes

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