2K x 8 Dual-Port Static RAM
CY7C132, CY7C136
CY7C136A, CY7C142, CY7C146
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Document #: 38-06031 Rev. *E
Revised March 24, 2009
Features
■
True dual-ported memory cells that enable simultaneous reads
of the same memory location
■
2K x 8 organization
■
0.65 micron CMOS for optimum speed and power
■
High speed access: 15 ns
■
Low operating power: I
CC
= 110 mA (maximum)
■
Fully asynchronous operation
■
Automatic power down
■
Master CY7C132/CY7C136/CY7C136A
[1]
easily expands data
bus width to 16 or more bits using slave CY7C142/CY7C146
■
BUSY output flag on CY7C132/CY7C136/CY7C136A;
BUSY input on CY7C142/CY7C146
■
INT flag for port to port communication (52-Pin PLCC/PQFP
versions)
■
CY7C136, CY7C136A, and CY7C146 available in 52-pin
PLCC and 52-pin PQFP packages
■
Pb-free packages available
Functional Description
The CY7C132, CY7C136, CY7C136A, CY7C142, and CY7C146
are high speed CMOS 2K x 8 dual-port static RAMs. Two ports
are provided to permit independent access to any location in
memory. The CY7C132, CY7C136, and CY7C136A can be used
as either a standalone 8-bit dual-port static RAM or as a
MASTER dual-port RAM, in conjunction with the
CY7C142/CY7C146 SLAVE dual-port device. They are used in
systems that require 16-bit or greater word widths. This is the
solution to applications that require shared or buffered data, such
as cache memory for DSP, bit-slice, or multiprocessor designs.
Each port has independent control pins; chip enable (CE), write
enable (R/W), and output enable (OE). BUSY flags are provided
on each port. In addition, an interrupt flag (INT) is provided on
each port of the 52-pin PLCC version. BUSY signals that the port
is trying to access the same location currently being accessed
by the other port. On the PLCC version, INT is an interrupt flag
indicating that data is placed in an unique location (7FF for the
left port and 7FE for the right port).
An automatic power down feature is controlled independently on
each port by the chip enable (CE) pins.
R/W
L
BUSY
L
CE
L
OE
L
A
10L
A
0L
A
0R
A
10R
R/W
R
CE
R
OE
R
CE
R
OE
R
CE
L
OE
L
R/W
L
R/W
R
I/O
7L
I/O
0L
I/O
7R
I/O
0R
BUSY
R
INT
L
INT
R
ARBITRATION
LOGIC
(7C132/7C136 ONLY)
AND
INTERRUPTLOGIC
(7C136/7C146 ONLY)
CONTROL
I/O
CONTROL
I/O
MEMORY
ARRAY
ADDRESS
DECODER
ADDRESS
DECODER
[2]
[3]
[3]
[2]
Logic Block Diagram
Notes
1. CY7C136 and CY7C136A are functionally identical.
2. CY7C132/CY7C136/CY7C136A (Master): BUSY is open drain output and requires pull up resistor. CY7C142/CY7C146 (Slave): BUSY is input.
3. Open drain outputs; pull up resistor required.
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