Cypress CY7C1007B manual Features, Functional Description, Logic Block Diagram, Pin Configuration

CY7C107B

CY7C1007B

Features

•High speed

—tAA = 12 ns

•CMOS for optimum speed/power

•Automatic power-down when deselected

•TTL-compatible inputs and outputs

Functional Description

The CY7C107B and CY7C1007B are high-performance CMOS static RAMs organized as 1,048,576 words by 1 bit. Easy memory expansion is provided by an active LOW Chip Enable (CE) and three-state drivers. These devices have an automatic power-down feature that reduces power consump- tion by more than 65% when deselected.

1M x 1 Static RAM

Writing to the devices is accomplished by taking Chip Enable (CE) and Write Enable (WE) inputs LOW. Data on the input pin (DIN) is written into the memory location specified on the ad- dress pins (A0 through A19).

Reading from the devices is accomplished by taking Chip En- able (CE) LOW while Write Enable (WE) remains HIGH. Under these conditions, the contents of the memory location speci- fied by the address pins will appear on the data output (DOUT) pin.

The output pin (DOUT) is placed in a high-impedance state when the device is deselected (CE HIGH) or during a write operation (CE and WE LOW).

The CY7C107B is available in a standard 400-mil-wide SOJ; the CY7C1007B is available in a standard 300-mil-wide SOJ.

Logic Block Diagram

Pin Configuration

			INPUT BUFFER
A0
	DECODER
A1
A2
A3
A4				512x2048
A5
	ROW					ARRAY
A7
A6
A8
			COLUMN
			DECODER
	9 10	11	12	13	14		15	16	17	18	19
	A A A A A A A A A A A

	DIN
AMPS
SENSE	DOUT
POWER
DOWN	CE
	WE
	107B-1

		SOJ
	Top View
A10	1	28	VCC
A11	2	27	A
A12	3	26	9
			A
A13			8
	4	25	A
A14		24	7
	5		A6
		23
A15	6		A5
		22
NC	7		A4
		21
A16	8		NC
		20
A17	9		A3
A18	10	19	A2
A19	11	18	A1
DOUT	12	17	A0
WE	13	16	DIN
GND	14	15	CE
			107B-2

Selection Guide

	7C107B-12	7C107B-15	7C107B-20	7C107B-25	7C107B-35
	7C1007B-12	7C1007B-15	7C1007B-20	7C1007B-25	7C1007B-35
Maximum Access Time (ns)	12	15	20	25	35
Maximum Operating	90	80	75	70	60
Current (mA)
Maximum CMOS Standby	2	2	2	2	2
Current SB2 (mA)

Cypress Semiconductor Corporation • 3901 North First Street	• San Jose • CA 95134 • 408-943-2600
Document #: 38-05030 Rev. **	Revised September 7, 2001

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