CY7C007A-20AC Cypress Semiconductor Corp, CY7C007A-20AC Datasheet - Page 12

• Manufacturer Part Number: CY7C007A-20AC
• Description: IC SRAM 256KBIT 20NS 80LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C007A-20AC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 256K (32K x 8)
• Speed: 20ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1144

Document #: 38-06045 Rev. *D
Switching Waveforms
Semaphore Read After Write Timing, Either Side
Timing Diagram of Semaphore Contention
Notes:
35. CE = HIGH for the duration of the above timing (both write and read cycle).
36. I/O
37. Semaphores are reset (available to both ports) at cycle start.
38. If t
A
A
A
SPS
0R
0R
0L
0
SEM
SEM
SEM
–A
R/W
R/W
R/W
I/O
–A
= I/O
–A
OE
is violated, the semaphore will definitely be obtained by one side or the other, but which side will get the semaphore is unpredictable.
2
2L
2R
0
R
L
L
R
0L
= LOW (request semaphore); CE
t
SA
(continued)
VALID ADRESS
t
AW
WRITE CYCLE
R
t
t
PWE
SCE
= CE
t
SD
DATA
t
MATCH
SPS
MATCH
L
[36, 37, 38]
= HIGH.
t
IN
HA
VALID
t
[35]
HD
t
SWRD
t
SOP
t
SOP
READ CYCLE
t
AA
VALID ADRESS
t
DOE
t
ACE
CY7C006A/CY7C007A
CY7C016A/CY7C017A
DATA
OUT
VALID
t
OHA
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