27C256 datasheet(5/12 Pages) MICROCHIP

5 / 12 page

DS11001L-page 5

27C256

FIGURE 1-2:

PROGRAMMING WAVEFORMS

TABLE 1-6:

MODES

Operation Mode

VPP

O0 - O7

Read

VIL

VCC

XDOUT

Program

VIL

VIH

XDIN

Program Verify

VIH

VIL

XDOUT

Program Inhibit

VIH

High Z

Standby

VIH

XVCC

High Z

Output Disable

VIL

VIH

VCC

High Z

Identity

VIL

VCC

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

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:

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

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).

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