CY7C138-25JC Cypress Semiconductor Corp, CY7C138-25JC Datasheet - Page 14

• Manufacturer Part Number: CY7C138-25JC
• Description: IC SRAM 32KBIT 25NS 68PLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C138-25JC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 32K (4K x 8)
• Speed: 25ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• Density: 32Kb
• Access Time (max): 25ns
• Sync/async: Asynchronous
• Architecture: Not Required
• Clock Freq (max): Not RequiredMHz
• Operating Supply Voltage (typ): 5V
• Address Bus: 12b
• Package Type: PLCC
• Operating Temp Range: 0C to 70C
• Number Of Ports: 2
• Supply Current: 180mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 68
• Word Size: 8b
• Number Of Words: 4K
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1445

Table 3. Non-Contending Read/Write
Table 4. Interrupt Operation Example (assumes BUSY
Table 5. Semaphore Operation Example
Document #: 38-06037 Rev. *E
Set Left INT
Reset Left INT
Set Right INT
Reset Right INT
No action
Left port writes semaphore
Right port writes 0 to semaphore
Left port writes 1 to semaphore
Left port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 1 to semaphore
Right port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 0 to semaphore
Left port writes 1 to semaphore
CE
H
H
X
H
L
L
L
R/W
X
H
X
H
X
L
Function
Function
Inputs
OE
H
X
L
X
L
X
X
SEM
H
X
H
H
L
L
L
High Z
Data Out
High Z
Data In
Data Out
Data In
R/W
I/O
X
X
X
L
0-7/8
1
0
0
1
1
0
1
1
1
0
1
L
=BUSY
Left
Outputs
CE
I/O
X
L
L
X
0-7/8
Left Port
R
=HIGH)
I/O
OE
X
X
X
L
0-7/8
1
1
1
0
0
1
1
0
1
1
1
A
Right
FFE
FFF
0-11
X
X
Power Down
Read Data in Semaphore
I/O Lines Disabled
Write to Semaphore
Read
Write
Illegal Condition
Semaphore free
Left port obtains semaphore
Right side is denied access
Right port is granted access to semaphore
No change. Left port is denied access
Left port obtains semaphore
No port accessing semaphore address
Right port obtains semaphore
No port accessing semaphore
Left port obtains semaphore
No port accessing semaphore
INT
H
X
X
L
R/W
X
X
X
L
CY7C138, CY7C139
Operation
CE
L
X
X
L
Status
Right Port
OE
X
X
X
L
A
FFE
FFF
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0-11
X
X
INT
X
X
H
L
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