MCM69R818C 查看數據表（PDF） - Motorola => Freescale

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MCM69R818C

4M Late Write HSTL

Motorola => Freescale 

Freescale Semiconductor, Inc.

AC INPUT CHARACTERISTICS (See Note 1)

Parameter

Symbol

Min

Max

Notes

AC Input Logic High (See Figure 4)

VIH (ac)

Vref + 200 mV

—

AC Input Logic Low (See Figures 2 and 4)

VIL (ac)

—

Vref – 200 mV

2

Input Reference Peak–to–Peak AC Voltage

Vref (ac)

—

5% Vref (dc)

3

Clock Input Differential Voltage

Vdif (ac)

400 mV

VDDQ + 600 mV

4

NOTES:

1. Inputs may overshoot to VDD + 1.5 V (peak) for up to 35% tKHKH (e.g., 1.5 ns at a clock cycle time of 4.4 ns). See Figure 2.

2. Inputs may undershoot to –0.5 V (peak) for up to 20% tKHKH (e.g., 2 ns at a clock cycle time of 10 ns). See Figure 2.

3. Although considerable latitude in the selection of the nominal dc value (i.e., rms value) of Vref is supported, the peak–to–peak ac compo-

nent superimposed on Vref may not exceed 5% of the dc component of Vref.

4. Minimum instantaneous differential input voltage required for differential input clock operation.

VIH

VSS

–1.0 V

–1.5 V

35% tKHKH

Figure 2. Undershoot Voltage

VDDQ

VTR

VDIF

CROSSING POINT

VCP

VCM*

VSS

* VCM, the Common Mode Input Voltage, equals VTR – [(VTR – VCP)/2].

Figure 3. Differential Inputs/Common Mode Input Voltage

VDDQ

VIH(ac)

Vref

VIL(ac)

VSS

MOTOROLA FAST SRAM

Figure 4. AC Input Conditions

For More Information On This Product, MCM69R736C•MCM69R818C

Go to: www.freescale.com

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