CY7C138-15JXC Cypress Semiconductor Corp, CY7C138-15JXC Datasheet - Page 9

• Manufacturer Part Number: CY7C138-15JXC
• Description: IC SRAM 32KBIT 15NS 68PLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C138-15JXC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 32K (4K x 8)
• Speed: 15ns
• 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: Lead free / RoHS Compliant

Document #: 38-06037 Rev. *B
Switching Waveforms
Timing Diagram of Semaphore Contention
Timing Diagram of Read with BUSY (M/S = HIGH)
Write Timing with Busy Input (M/S=LOW)
Notes:
27. I/O
28. Semaphores are reset (available to both ports) at cycle start.
29. If t
ADDRESS
ADDRESS
DATA
SPS
DATA IN
0R
A
BUSY
BUSY
A
= I/O
R/W
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.
0R
R/W
0L
OUTL
SEM
SEM
R/W
R/W
–A
–A
0L
R
L
2R
R
R
2L
L
R
R
= LOW (request semaphore); CE
L
L
(continued)
t
PS
R
= CE
t
WB
L
[27, 28, 29]
t
= HIGH
MATCH
SPS
MATCH
t
BLA
[21]
MATCH
MATCH
t
WC
t
PWE
t
PWE
t
WH
t
WDD
t
VALID
SD
t
DDD
t
HD
t
BHA
t
BDD
CY7C138
CY7C139
VALID
Page 9 of 16
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