CY7C266-45PC 데이터 시트보기 (PDF) - Cypress Semiconductor

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CY7C266-45PC

8Kx8 Power-Switched and Reprogrammable PROM

Cypress Semiconductor 

CY7C266

Erasure Characteristics

Wavelengths of light less than 4000 angstroms begin to erase

the devices in the windowed package. For this reason, an

opaque label should be placed over the window if the EPROM

is exposed to sunlight or fluorescent lighting for extended

periods of time.

The recommended dose of ultraviolet light for erasure is a

wavelength of 2537 angstroms for a minimum dose (UV

intensity multiplied by exposure time) of 25 Wsec/cm2. For an

ultraviolet lamp with a 12 mW/cm2 power rating, the exposure time

would be approximately 35 minutes. The CY7C266 needs to be

within 1 inch of the lamp during erasure. Permanent damage may

result if the EPROM is exposed to high-intensity UV light for an

extended period of time.

7258 Wsec/cm2 is the recommended maximum dosage.

Programming Modes

Programming support is available from Cypress as well as

from a number of third party software vendors. For detailed

programming information, including a listing of software

packages, please see the PROM Programming Information

located at the end of this section. Programming algorithms can

be obtained from any Cypress representative.

Table 1. Mode Selection

Mode

Normal Operation

Program

A8

A9

A10

VFY

PGM

LAT

Read

Standby

A8

A9

A10

X

X

X

Output Disable

A8

A9

A10

Program

VIHP

VILP

VILP

Program Verify

VILP

VIHP

VILP

Program Inhibit

VIHP

VIHP

VILP

Blank Check

VILP

VIHP

VILP

Notes:

4. X = “don’t care” but must not exceed VCC + 5%.

5. Address A8–A12 must be latched through lines A0–A4 in Programming modes.

Pin Function[4, 5]

A11

NA

A11

X

A11

VILP

VILP

VILP

VILP

A12

NA

A12

X

A12

VILP

VILP

VILP

VILP

CE

OE

CE

VPP

VIL

VIL

VIH

X

VIL

VIH

VILP

VPP

VILP

VPP

VILP

VPP

VILP

VPP

D7–D0

D7–D0

O7–O0

Three-Stated

Three-Stated

D7–D0

O7–O0

Three-Stated

O7–O0

CerDIP

Top View

NC

NA

A7

A6

A5

A4/A12

A3/A11

A2/A10

A1/A9

A0/A8

D0

D1

D2

VSS

1

28

2

27

3

26

4

25

5

24

6 7C266 23

7

22

8

21

9

20

10

19

11

18

12

17

13

16

14

15

VPP

NC

NC

VFY

PGM

NA

VPP

LAT

CE

D7

D6

D5

D4

D3

LCC/PLCC

Top View

A6

A5

A4/A12

A3/A11

A2/A1

A1/A09

A0/A8

NC

D0

4 3 2 1 32 31 30

5

29

6

7

7C266

28

27

8

26

9

25

10

24

11

23

12

22

13

21

14151617 181920

VFY

PGM

NA

NC

VPP

LAT

CE

D7

D6

Figure 1. Programming Pinout

Document #: 38-04005 Rev. *B

Page 5 of 11

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