PY264 datasheet(4/8 Pages) PYRAMID

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PY264

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Document # EPROM102 REV OR

DEVICE ERASURE

If the device is subjected to wavelengths of light below

4000 Angstroms, device erasure will commence. It is

therefore recommended to use an opaque label over the

window in the event the device will be exposed to lighting

for a long time. The UV dose for erasure requires a

wavelength of 2,537 Angstroms for a minimum dose of

25 Wsec/cm2. If using a UV lamp of 12 mW/cm2, the

exposure time is estimated to be 35 minutes. Devices

should be positioned within 1 inch of the lamp during the

erasure process. Permanent damage can occur to the

devices if exposed to UV light for an extended period of

time.

MODE SELECTION

PROGRAMMING PINOUTS

Read or Output Disable

A12

A11

A10

O7-O0

Program

Vpp

LATCH

PGM

VFY

D7-D0

A12

A11

A10

VIL

O7-O0

A12

A11

A10

VIH

High Z

VILP

Vpp

VILP

VIHP

VILP

D7-D0

VILP

Vpp

VILP

VIHP

VILP

High Z

VILP

Vpp

VILP

VIHP

VILP

O7-O0

VILP

Vpp

VILP

VIHP

VILP

O7-O0

Pin Function

Program Verify

Blank Check

Program

Program Inhibit

Mode

Read

Output Disable

READ MODE

Reading the addressed content is the normal operating

mode for a programmed device. Signals are at normal

TTL levels. Addressing is applied to the 13 address pins

and

CS is LOW. Under these conditions, the addressed

location contents are presented to the output pins.

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