V54C3256804VT datasheet(19/52 Pages) MOSEL

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V54C3256(16/80/40)4V(T/S/B) Rev. 1.6 September 2002

MOSEL VITELIC

V54C3256(16/80/40)4V(T/S/B)

Notes for AC Parameters:

For proper power-up see the operation section of this data sheet.

AC timing tests have VIL = 0.8V and VIH = 2.0V with the timing referenced to the 1.4 V crossover point. The transition

time is measured between VIH and VIL. All AC measurements assume tT = 1ns with the AC output load circuit shown

in Figure 1.

If clock rising time is longer than 1 ns, a time (tT/2 – 0.5) ns has to be added to this parameter.

If tT is longer than 1 ns, a time (tT – 1) ns has to be added to this parameter.

These parameter account for the number of clock cycle and depend on the operating frequency of the clock, as

follows:

the number of clock cycle = specified value of timing period (counted in fractions as a whole number)

Self Refresh Exit is a synchronous operation and begins on the 2nd positive clock edge after CKE returns high.

Self Refresh Exit is not complete until a time period equal to tRC is satisfied once the Self Refresh Exit command

is registered.

Referenced to the time which the output achieves the open circuit condition, not to output voltage levels

Read Cycle

tOH

Data Out Hold Time

–

–3–ns

tLZ

Data Out to Low Impedance Time

–

–0–ns

tHZ

Data Out to High Impedance Time

738ns

tDQZ

DQM Data Out Disable Latency

–

CLK

Write Cycle

tWR

Write Recovery Time

2–

–

CLK

tDQW

DQM Write Mask Latency

–

CLK

Symbol

Parameter

Limit Values

Unit

Note

-6

-7PC

-7

-8PC

Min. Max. Min. Max. Min. Max. Min. Max.

1.4V

tCS

tCH

tAC

tLZ

tOH

tHZ

CLK

COMMAND

OUTPUT

50 pF

I/O

Z=50 Ohm

+ 1.4 V

50 Ohm

VIH

VIL

Figure 1.

tCK

AC Characteristics (Cont’d)

V54C3256804VT Datasheet(PDF) 19 Page - Mosel Vitelic, Corp

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