27C256-15L datasheet(5/12 Pages) MICROCHIP

Part #	27C256-15L

Description	256K (32K x 8) CMOS EPROM

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Manufacturer	MICROCHIP [Microchip Technology]

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DS11001L-page 5

27C256

FIGURE 1-2:

PROGRAMMING WAVEFORMS

TABLE 1-6:

MODES

Operation Mode

CE

OE

VPP

A9

O0 - O7

Read

VIL

VCC

XDOUT

Program

VIL

VIH

VH

XDIN

Program Verify

VIH

VIL

VH

XDOUT

Program Inhibit

VIH

VH

X

High Z

Standby

VIH

XVCC

X

High Z

Output Disable

VIL

VIH

VCC

X

High Z

Identity

VIL

VCC

VH

Identity Code

X = Don’t Care

VIH

VIL

VIH

VIL

13.0V(2)

5.0V

6.5V(2)

5.0V

VIH

VIL

VIH

VIL

Address

Data

VPP

VCC

CE

OE

tDF and tOE are characteristics of the device but must be accommodated by the programmer

VCC = 6.5 V

±0.25V, VPP = VH = 13.0V ±0.25V for express algorithm

tPW

tOES

Address Stable

tAH

tDS

tVPS

tDF

(1)

tDH

tOE

(1)

tAS

Program

Data Stable

Data Out Valid

Verify

tVCS

Notes:

(1)

(2)

High Z

1.2

Read Mode

(See Timing Diagrams and AC Characteristics)

Read Mode is accessed when:

a)

the CE pin is low to power up (enable) the chip

b)

the OE pin is low to gate the data to the output

pins

For Read operations, if the addresses are stable, the

address access time (tACC) is equal to the delay from

CE to output (tCE). Data is transferred to the output

after a delay from the falling edge of OE (tOE).

Similar Part No. - 27C256-15L

Manufacturer	Part #	Datasheet	Description
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NXP Semiconductors	27C256-15A	558Kb / 14P	256K-bit CMOS EPROM (32K x 8) November 12 1990

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27C256-15L Datasheet(PDF) 5 Page - Microchip Technology

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