CY7C144-55JC Cypress Semiconductor Corp, CY7C144-55JC Datasheet - Page 12

• Manufacturer Part Number: CY7C144-55JC
• Description: IC SRAM 64KB DUAL 68-PLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C144-55JC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 64K (8K x 8)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Switching Waveforms
Notes
Document #: 38-06034 Rev. *F
24. CE = HIGH for the duration of the above timing (both write and read cycle).
25. I/O
26. Semaphores are reset (available to both ports) at cycle start.
27. If t
SPS
A
0R
0
SEM
A
A
R/W
A
I/O
= I/O
OE
0R
is violated, the semaphore will definitely be obtained by one side or the other, but there is no guarantee which side will control the semaphore.
0L
SEM
2
0
SEM
A
R/W
A
R/W
0L
2R
2L
= LOW (request semaphore); CE
R
L
L
R
t
SA
Figure 10. Semaphore Read After Write Timing, Either Side
(continued)
VALID ADDRESS
t
AW
WRITE CYCLE
R
t
t
PWE
SCE
= CE
t
Figure 11. Semaphore Contention
DATA
SD
L
= HIGH
t
MATCH
SPS
MATCH
t
IN
HA
VALID
t
HD
t
SWRD
t
SOP
t
SOP
READ CYCLE
VALID ADDRESS
t
AA
[25, 26, 27]
t
ACE
t
DOE
DATA
[24]
CY7C144, CY7C145
OUT
VALID
t
OHA
Page 12 of 20
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