CAT28F512 datasheet(13/14 Pages) CATALYST

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CAT28F512

Preliminary

Doc. No. 25042-00 2/98 F-1

ADDRESSES

WE (E)

OE (G)

CE (W)

DATA (I/O)

VCC

VPP

tWC

tRC

tAVEL

tELAX

tWLEL

tEHQZ

tDF

tGHEL

tEHEL

tEHEH

tEHGL

tELEH

HIGH-Z

DATA IN

= 40H

DATA IN

= C0H

VALID

DATA OUT

tEHDX

tOLZ

tOE

tOH

tLZ

tCE

tVPEL

VPPH

VPPL

5.0V

VCC POWER-UP

& STANDBY

SETUP PROGRAM

COMMAND

LATCH ADDRESS

& DATA

PROGRAMMING

PROGRAM

VERIFY

COMMAND

PROGRAM

VERIFICATION

VCC POWER-DOWN/

STANDBY

tWLEL

tEHWH

tELEH

tDVEH

tEHDX

Abort/Reset

An Abort/Reset command is available to allow the user

to safely abort an erase or program sequence. Two

consecutive program cycles with FFH on the data bus

will abort an erase or a program operation. The abort/

reset operation can interrupt at any time in a program or

erase operation and the device is reset to the Read

Mode.

Figure 8. Alternate A.C. Timing for Program Operation

28F512 F10

POWER UP/DOWN PROTECTION

The CAT28F512 offers protection against inadvertent

programming during VPP and VCC power transitions.

When powering up the device there is no power-on

sequencing necessary. In other words, VPP and VCC

may power up in any order. Additionally VPP may be

hardwired to VPPH independent of the state of VCC and

any power up/down cycling. The internal command

power up.

POWER SUPPLY DECOUPLING

To reduce the effect of transient power supply voltage

spikes, it is good practice to use a 0.1

µF ceramic

capacitor between VCC and VSS and VPP and VSS. These

high-frequency capacitors should be placed as close as

possible to the device for optimum decoupling.

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