CY7C027-20AC Cypress Semiconductor Corp, CY7C027-20AC Datasheet - Page 11

• Manufacturer Part Number: CY7C027-20AC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C027-20AC

• Density: 512Kb
• Access Time (max): 20ns
• Sync/async: Asynchronous
• Architecture: Not Required
• Clock Freq (max): Not RequiredMHz
• Operating Supply Voltage (typ): 5V
• Address Bus: 15b
• Package Type: TQFP
• Operating Temp Range: 0C to 70C
• Number Of Ports: 2
• Supply Current: 265mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 100
• Word Size: 16b
• Number Of Words: 32K
• Lead Free Status / Rohs Status: Not 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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