CY7C028-15AI Cypress Semiconductor Corp, CY7C028-15AI Datasheet - Page 11

• Manufacturer Part Number: CY7C028-15AI
• Description: IC SRAM 64KX16 ASYN DUAL 100TQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C028-15AI

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 1M (64K x 16)
• Speed: 15ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Switching Waveforms
Document #: 38-06042 Rev. *D
Notes
37. CE = HIGH for the duration of the above timing (both write and read cycle).
38. I/O
39. Semaphores are reset (available to both ports) at cycle start.
40. If t
A
A
A
0R
SPS
0L
0R
0
SEM
SEM
–A
SEM
R/W
R/W
R/W
–A
–A
I/O
OE
= I/O
is violated, the semaphore is definitely obtained by one side or the other, but which side gets the semaphore is unpredictable.
2
2L
0
2R
R
L
R
L
0L
= LOW (request semaphore); CE
t
SA
Figure 10. Timing Diagram of Semaphore Contention
Figure 9. Semaphore Read After Write Timing, Either Side
(continued)
VALID ADRESS
t
AW
WRITE CYCLE
t
t
R
PWE
SCE
= CE
t
SD
DATA
t
MATCH
SPS
MATCH
L
= HIGH.
t
IN
HA
VALID
t
HD
t
SWRD
t
SOP
t
SOP
READ CYCLE
t
SAA
VALID ADRESS
t
DOE
t
ACE
[38, 39, 40]
[37]
DATA
OUT
VALID
t
OHA
CY7C027/028
CY7C037/038
Page 11 of 19
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