CY7C138-25JC Cypress Semiconductor Corp, CY7C138-25JC Datasheet - Page 13
![IC SRAM 32KBIT 25NS 68PLCC](/photos/31/38/313851/68pin_plcc_sml.jpg)
CY7C138-25JC
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CY7C138-25JC
Manufacturer:
CYPRESS
Quantity:
13 888
Company:
Part Number:
CY7C138-25JC
Manufacturer:
Cypress Semiconductor Corp
Quantity:
10 000
Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
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
H
X
L
L
L
R/W
X
H
X
H
X
L
Inputs
OE
H
X
X
X
X
L
L
Function
Function
SEM
H
H
H
L
X
L
L
High Z
Data Out
High Z
Data In
Data Out
Data In
Outputs
I/O
0-7/8
Power-Down
Read Data in
Semaphore
I/O Lines Disabled
Write to Semaphore
Read
Write
Illegal Condition
Operation
I/O
R/W
X
X
X
L
0-7/8
1
0
0
1
1
0
1
1
1
0
1
Left
L
CE
=BUSY
X
X
L
L
13
Left Port
I/O
OE
R
0-7/8
X
L
X
X
=HIGH)
1
1
1
0
0
1
1
0
1
1
1
Right
A
FFE
FFF
0-11
X
X
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
CE
X
X
L
L
Status
Right Port
OE
X
X
X
L
CY7C138
CY7C139
A
FFE
FFF
0-11
X
X
INT
X
X
H
L