CY7C025-25AC Cypress Semiconductor Corp, CY7C025-25AC Datasheet - Page 12

• Manufacturer Part Number: CY7C025-25AC
• Description: IC,SRAM,8KX16,CMOS,QFP,100PIN,PLASTIC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C025-25AC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 128K (8K x 16)
• Speed: 25ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Switching Waveforms
Notes
Document #: 38-06035 Rev. *D
28. R/W must be HIGH during all address transitions.
29. A write occurs during the overlap (t
30. t
31. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of t
32. To access RAM, CE = V
33. To access upper byte, CE = V
34. Transition is measured ±500 mV from steady state with a 5 pF load (including scope and jig). This parameter is sampled and not 100% tested.
35. During this period, the I/O pins are in the output state, and input signals must not be applied.
36. If the CE or SEM LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the high impedance state.
CE
DATA OUT
ADDRESS
ADDRESS
CE
placed on the bus for the required t
the specified t
To access lower byte, CE = V
HA
DATA IN
DATA IN
[32,33]
is measured from the earlier of CE or R/W or (SEM or R/W) going HIGH at the end of write cycle.
[32,33]
R/W
R/W
OE
PWE
.
IL
, SEM = V
IL
, LB = V
IL
, UB = V
t
t
SA
SA
IH
NOTE 35
SD
SCE
Figure 7. Write Cycle No. 1: R/W Controlled Timing
IL
Figure 8. Write Cycle No. 2: CE Controlled Timing
.
(continued)
, SEM = V
. If OE is HIGH during an R/W controlled write cycle, this requirement does not apply and the write pulse can be as short as
IL
or t
, SEM = V
PWE
) of a LOW CE or SEM and a LOW UB or LB.
IH
.
IH
.
t
HZWE
[34]
t
t
AW
AW
t
t
WC
WC
t
t
SCE
PWE
[31]
t
t
SD
SD
PWE
or (t
HZWE
t
t
HA
HA
[28, 29, 30, 36]
+ t
[28, 29, 30, 31]
SD
t
t
HD
HD
) to allow the I/O drivers to turn off and data to be
t
LZWE
CY7C024/024A/0241
t
HZOE
CY7C025/0251
NOTE 35
[34]
Page 12 of 21
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