CY7C265-25PC datasheet, PDF - EEWORLD Datasheet

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CY7C265-25PC: Description8K x 8 Registered PROM; File Size202KB，11 Pages; ManufacturerCypress Semiconductor

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CY7C265-25PC Overview

8K x 8 Registered PROM

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CY7C265

8K x 8 Registered PROM

Features

• CMOS for optimum speed/power

• High speed (Commercial)

— 15 ns address set-up

— 12 ns clock to output

• Low power

— 660 mW (Commercial)

• On-chip edge-triggered registers

— Ideal for pipelined microprogrammed systems

• EPROM technology

— 100% programmable

— Reprogrammable (CY7C265W)

• 5V

±10%

, commercial and military

• Capable of withstanding >2001V static discharge

• Slim 28-pin, 300-mil plastic or hermetic DIP

If the asynchronous enable (E) is being used, the outputs may

be disabled at any time by switching the enable to a logic

HIGH, and may be returned to the active state by switching the

enable to a logic LOW.

If the synchronous enable (E

) is being used, the outputs will

go to the OFF or high-impedance state upon the next positive

clock edge after the synchronous enable input is switched to

a HIGH level. If the synchronous enable pin is switched to a

logic LOW, the subsequent positive clock edge will return the

output to the active state. Following a positive clock edge, the

address and synchronous enable inputs are free to change

since no change in the output will occur until the next

LOW-to-HIGH transition of the clock. This unique feature al-

lows the CY7C265 decoders and sense amplifiers to access

the next location while previously addressed data remains sta-

ble on the outputs.

If the E/I pin is used for INIT (asynchronous), then the outputs

are permanently enabled. The initialize function is useful

during power-up and time-out sequences, and can facilitate

implementation of other sophisticated functions such as a

built-in “jump start” address. When activated, the initialize

control input causes the contents of a user programmed

8193rd 8-bit word to be loaded into the on-chip register. Each

bit is programmable and the initialize function can be used to

load any desired combination of 1’s and 0’s into the register.

In the unprogrammed state, activating INIT will generate a

word are programmed to be a 1, activating INIT performs a

Applying a LOW to the INIT input causes an immediate load

of the programmed initialize word into the pipeline register and

onto the outputs. The INIT LOW disables clock and must

return HIGH to enable clock independent of all other inputs,

including the clock.

Functional Description

The CY7C265 is a 8192 x 8 registered PROM. It is organized

as 8,192 words by 8 bits wide, and has a pipeline output

initialize byte that may be loaded into the pipeline register with

the initialize signal. The programmable initialize byte is the

8,193rd byte in the PROM and its value is programmed at the

time of use.

Packaged in 28 pins, the PROM has 13 address signals (A

through A

), 8 data out signals (O

through O

), E/I (enable

or initialize), and CLOCK.

CLOCK functions as a pipeline clock, loading the contents of

the addressed memory location into the pipeline register on

each rising edge. The data will appear on the outputs if they

are enabled. One pin on the CY7C265 is programmed to

perform either the enable or the initialize function.

Cypress Semiconductor Corporation

Document #: 38-04012 Rev. *A

•

3901 North First Street

•

San Jose

•

CA 95134 • 408-943-2600

Revised October 9, 2002

CY7C265-25PC Related Products

	CY7C265-25PC	CY7C265-50DMB
Description	8K x 8 Registered PROM	8K x 8 Registered PROM

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