Cypress CY7C1245V18 Manual De Usuario
CY7C1241V18, CY7C1256V18
CY7C1243V18, CY7C1245V18
CY7C1243V18, CY7C1245V18
Document Number: 001-06365 Rev. *D
Page 23 of 28
Switching Characteristics
Over the Operating Range
Cypress
Parameter
Consortium
Parameter
Description
375 MHz
333 MHz
300 MHz
Unit
Min
Max
Min
Max
Min
Max
t
POWER
V
DD
(Typical) to the First Access
1
–
1
–
1
–
ms
t
CYC
t
KHKH
K Clock Cycle Time
2.66
8.4
3.0
8.4
3.3
8.4
ns
t
KH
t
KHKL
Input Clock (K/K) HIGH
0.4
–
0.4
–
0.4
–
t
CYC
t
KL
t
KLKH
Input Clock (K/K) LOW
0.4
–
0.4
–
0.4
–
t
CYC
t
KHKH
t
KHKH
K Clock Rise to K Clock Rise (rising edge to rising edge) 1.13
–
1.28
–
1.40
–
ns
Set-up Times
t
SA
t
AVKH
Address Set-up to K Clock Rise
0.4
–
0.4
–
0.4
–
ns
t
SC
t
IVKH
Control Set-up to K Clock Rise (RPS, WPS)
0.4
–
0.4
–
0.4
–
ns
t
SCDDR
t
IVKH
Double Data Rate Control Set-up to Clock (K, K) Rise
(BWS
(BWS
0
, BWS
1,
BWS
2
, BWS
3
)
0.28
–
0.28
–
0.28
–
ns
t
SD
t
DVKH
D
[X:0]
Set-up to Clock (K/K) Rise
0.28
–
0.28
–
0.28
–
ns
Hold Times
t
HA
t
KHAX
Address Hold after K Clock Rise
0.4
–
0.4
–
0.4
–
ns
t
HC
t
KHIX
Control Hold after K Clock Rise (RPS, WPS)
0.4
–
0.4
–
0.4
–
ns
t
HCDDR
t
KHIX
Double Data Rate Control Hold after Clock (K/K) Rise
(BWS
(BWS
0
, BWS
1,
BWS
2
, BWS
3
)
0.28
–
0.28
–
0.28
–
ns
t
HD
t
KHDX
D
[X:0]
Hold after Clock (K/K) Rise
0.28
–
0.28
–
0.28
–
ns
Output Times
t
CO
t
CHQV
K/K Clock Rise to Data Valid
–
0.45
–
0.45
–
0.45
ns
t
DOH
t
CHQX
Data Output Hold after Output K/K Clock Rise
(Active to Active)
(Active to Active)
–0.45
–
–0.45
–
–0.45
–
ns
t
CCQO
t
CHCQV
K/K Clock Rise to Echo Clock Valid
–
0.45
–
0.45
–
0.45
ns
t
CQOH
t
CHCQX
Echo Clock Hold after K/K Clock Rise
–0.45
–
–0.45
–
–0.45
–
ns
t
CQD
t
CQHQV
Echo Clock High to Data Valid
0.2
0.2
0.2
ns
t
CQDOH
t
CQHQX
Echo Clock High to Data Invalid
–0.2
–
–0.2
–
–0.2
–
ns
t
CQH
t
CQHCQL
Output Clock (CQ/CQ) HIGH
0.88
–
1.03
–
1.15
–
ns
t
CQHCQH
t
CQHCQH
CQ Clock Rise to CQ Clock Rise
(rising edge to rising edge)
0.88
–
1.03
–
1.15
–
ns
t
CHZ
t
CHQZ
Clock (K/K) Rise to High-Z (Active to High-Z)
–
0.45
–
0.45
–
0.45
ns
t
CLZ
t
CHQX1
Clock (K/K) Rise to Low-Z
–0.45
–
–0.45
–
–0.45
–
ns
t
QVLD
t
CQHQVLD
Echo Clock High to QVLD Valid
–0.20 0.20 –0.20 0.20 –0.20 0.20
ns
DLL Timing
t
KC Var
t
KC Var
Clock Phase Jitter
–
0.20
–
0.20
–
0.20
ns
t
KC lock
t
KC lock
DLL Lock Time (K)
2048
–
2048
–
2048
–
Cycles
t
KC Reset
t
KC Reset
K Static to DLL Reset
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; t
POWER
is the time that the power must be supplied above V
DD
minimum initially before a read or write operation can
be initiated.
25. These parameters are extrapolated from the input timing parameters (t
KHKH
– 250 ps, where 250 ps is the internal jitter. An input jitter of 200 ps (t
KC Var
) is already
included in the t
KHKH
). These parameters are only guaranteed by design and are not tested in production.
26. t
CHZ
, t
CLZ
are specified with a load capacitance of 5 pF as in part (b) of
. Transition is measured
±100 mV from
steady-state voltage.
27. At any voltage and temperature t
CHZ
is less than t
CLZ
and t
CHZ
less than t
CO
.
28. t
QVLD
spec is applicable for both rising and falling edges of QVLD signal.
29. Hold to >V
IH
or <V
IL
.