Cypress manual CY7C132, CY7C136 CY7C136A, CY7C142, CY7C146, Features, Functional Description

CY7C132, CY7C136 CY7C136A, CY7C142, CY7C146

2K x 8 Dual-Port Static RAM

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: ICC = 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.

Logic Block Diagram
R/WL				R/WR
CEL				CER
OEL				OER
I/O7L	I/O		I/O	I/O7R
I/O0L	CONTROL		CONTROL	I/O0R
BUSYL[2]				BUSYR[2]
A 10L	ADDRESS	MEMORY	ADDRESS	A 10R
A 0L	DECODER	ARRAY	DECODER	A 0R
		ARBITRATION
		LOGIC
		(7C132/7C136 ONLY)
	CEL	AND	CER
		INTERRUPTLOGIC
	OEL	(7C136/7C146 ONLY)	OER
	R/WL		R/WR
INTL[3]				INTR[3]

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.

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document #: 38-06031 Rev. *E		Revised March 24, 2009

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