Cypress CY7C1256V18, CY7C1241V18 manual Switching Characteristics, Parameter Min Max, Set-up Times

CY7C1241V18, CY7C1256V18

CY7C1243V18, CY7C1245V18

Switching Characteristics

Over the Operating Range[22, 23]

Cypress

Consortium

Description

375 MHz

333 MHz

300 MHz

Unit

Parameter

Parameter

Min

Max

Min

Max

Min

Max

tPOWER

VDD(Typical) to the First Access[24]

1

–

1

–

1

–

ms

tCYC

tKHKH

K Clock Cycle Time

2.66

8.4

3.0

8.4

3.3

8.4

ns

tKH

tKHKL

Input Clock (K/K)

HIGH

0.4

–

0.4

–

0.4

–

tCYC

tKL

tKLKH

Input Clock (K/K)

LOW

0.4

–

0.4

–

0.4

–

tCYC

tKHKH

tKHKH

K Clock Rise to

K

Clock Rise (rising edge to rising edge)

1.13

–

1.28

–

1.40

–

ns

Set-up Times

tSA

tAVKH

Address Set-up to K Clock Rise

0.4

–

0.4

–

0.4

–

ns

tSC

tIVKH

Control Set-up to K Clock Rise

(RPS,

WPS)

0.4

–

0.4

–

0.4

–

ns

tSCDDR

tIVKH

Double Data Rate Control Set-up to Clock (K,

K) Rise

0.28

–

0.28

–

0.28

–

ns

(BWS0, BWS1, BWS2, BWS3)

tSD

tDVKH

D[X:0] Set-up to Clock (K/K)

Rise

0.28

–

0.28

–

0.28

–

ns

Hold Times

tHA

tKHAX

Address Hold after K Clock Rise

0.4

–

0.4

–

0.4

–

ns

tHC

tKHIX

Control Hold after K Clock Rise

(RPS,

WPS)

0.4

–

0.4

–

0.4

–

ns

tHCDDR

tKHIX

Double Data Rate Control Hold after Clock (K/K)

Rise

0.28

–

0.28

–

0.28

–

ns

(BWS0, BWS1, BWS2, BWS3)

tHD

tKHDX

D[X:0] Hold after Clock (K/K)

Rise

0.28

–

0.28

–

0.28

–

ns

Output Times

tCO

tCHQV

K/K

Clock Rise to Data Valid

–

0.45

–

0.45

–

0.45

ns

tDOH

tCHQX

Data Output Hold after Output K/K

Clock Rise

–0.45

–

–0.45

–

–0.45

–

ns

(Active to Active)

tCCQO

tCHCQV

K/K

Clock Rise to Echo Clock Valid

–

0.45

–

0.45

–

0.45

ns

tCQOH

tCHCQX

Echo Clock Hold after K/K

Clock Rise

–0.45

–

–0.45

–

–0.45

–

ns

tCQD

tCQHQV

Echo Clock High to Data Valid

0.2

0.2

0.2

ns

tCQDOH

tCQHQX

Echo Clock High to Data Invalid

–0.2

–

–0.2

–

–0.2

–

ns

tCQH

tCQHCQL

Output Clock (CQ/CQ)

HIGH[25]

0.88

–

1.03

–

1.15

–

ns

t

t

CQ Clock Rise to

CQ

Clock Rise[25]

0.88

–

1.03

–

1.15

–

ns

CQHCQH

CQHCQH

(rising edge to rising edge)

tCHZ

tCHQZ

Clock (K/K)

Rise to High-Z (Active to High-Z)[26,27]

–

0.45

–

0.45

–

0.45

ns

tCLZ

tCHQX1

Clock (K/K)

Rise to Low-Z[26,27]

–0.45

–

–0.45

–

–0.45

–

ns

tQVLD

tCQHQVLD

Echo Clock High to QVLD Valid[28]

–0.20

0.20

–0.20

0.20

–0.20

0.20

ns

DLL Timing

tKC Var

tKC Var

Clock Phase Jitter

–

0.20

–

0.20

–

0.20

ns

tKC lock

tKC lock

DLL Lock Time (K)

2048

–

2048

–

2048

–

Cycles

tKC Reset

tKC Reset

K Static to DLL Reset[29]

30

–

30

–

30

–

ns

Notes

23.When a part with a maximum frequency above 300 MHz is operating at a lower clock frequency, it requires the input timings of the frequency range in which it is being operated and outputs data with the output timing of that frequency range.

24.This part has an internal voltage regulator; tPOWER is the time that the power must be supplied above VDD minimum initially before a read or write operation can be initiated.

25.These parameters are extrapolated from the input timing parameters (tKHKH – 250 ps, where 250 ps is the internal jitter. An input jitter of 200 ps (tKC Var) is already included in the tKHKH). These parameters are only guaranteed by design and are not tested in production.

26.tCHZ, tCLZ are specified with a load capacitance of 5 pF as in part (b) of “AC Test Loads and Waveforms” on page 22. Transition is measured ±100 mV from steady-state voltage.

27.At any voltage and temperature tCHZ is less than tCLZ and tCHZ less than tCO.

28.tQVLD spec is applicable for both rising and falling edges of QVLD signal.

29.Hold to >VIH or <VIL.

Document Number: 001-06365 Rev. *D Page 23 of 28

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