CMS3216LAH datasheet(18/46 Pages) FIDELIX

18 / 46 page

Rev0.2, Jan. 2007

CMS3216LAx-75xx

AC Characteristics

tCK

tROH(1)

CL=1

tCK

tROH(2)

CL=2

tCK

tROH(3)

CL=3

Data-out to high-impedance from PRECHARGE command[38.]

tCK

tMRD

LOAD MODE REGISTER command to ACTIVE or REFRESH command[42.]

tCK

tRDL

Last data-in to PRECHARGE command[41.]

tCK

tCDL

Last data-in to new READ/WRITE command[38.]

Max

Min

Parameter

Units

-75

Symbol

AC Characteristics

Note :

33. The clock frequency must remain constant (stable clock is defined as a signal cycling within timing constraints specified for the clock pin) during access or precharge states

(READ, WRITE, including tWR, and PRECHARGE commands). CKE may be used to reduce the data rate.

34. AC characteristics assume tT = 1ns.

35. Auto precharge mode only.

36. Precharge mode only.

37. CLK must be toggled a minimum of two times during this period.

38. Required clocks are specified by JEDEC functionality and are not dependent on any timing parameter.

39. Timing actually specified by tCKS; clock(s) specified as a reference only at minimum cycle rate.

40. Timing actually specified by tWR plus tRP; clock(s) specified as a reference only at minimum cycle rate.

41. Timing actually specified by tWR.

42. JEDEC and PC100 specify three clocks.

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