SST49LF080A datasheet(19/50 Pages) MICROCHIP

19 / 50 page

DS20005086B

11/14

8 Mbit LPC Flash

SST49LF080A

Data Sheet

Toggle Bit (DQ6)

During the internal Program or Erase operation, any consecutive attempts to read DQ6 will produce

alternating ‘0’s and ‘1’s, i.e., toggling between 0 and 1. When the internal Program or Erase operation

is completed, the toggling will stop. The device is then ready for the next operation. The Toggle Bit is

valid after the rising edge of fourth WE# pulse for Program operation. For Sector-, Block-, or Chip-

Erase, the Toggle Bit is valid after the rising edge of sixth WE# pulse. See Figure 21 for Toggle Bit tim-

ing diagram and Figure 35 for a flowchart.

Data Protection (PP Mode)

The SST49LF080A devices provide both hardware and software features to protect nonvolatile data

from inadvertent writes.

Hardware Data Protection

Noise/Glitch Protection: A WE# pulse of less than 5 ns will not initiate a Write cycle.

VDD Power Up/Down Detection: The Write operation is inhibited when VDD is less than 1.5V.

Write Inhibit Mode: Forcing OE# low, WE# high will inhibit the Write operation. This prevents inadver-

tent writes during power-up or power-down.

Software Data Protection (SDP)

The SST49LF080A provides the JEDEC approved Software Data Protection scheme for all data alter-

ation operation, i.e., Program and Erase. Any Program operation requires the inclusion of a series of

three-byte sequence. The three-byte load sequence is used to initiate the Program operation, provid-

ing optimal protection from inadvertent Write operations, e.g., during the system power-up or power-

down. Any Erase operation requires the inclusion of a six-byte load sequence.

Table 10: Operation Modes Selection (PP Mode)

Mode

RST#

OE#

WE#

Address

Read

VIH

VIL

VIH

DOUT

AIN

Program

VIH

VIL

DIN

AIN

Erase

VIH

VIL

1. X can be VIL or VIH, but no other value.

Sector or Block address,

XXH for Chip-Erase

Reset

VIL

High Z

Write Inhibit

VIH

VIL

VIH

High Z/DOUT

Product Identification

VIH

VIL

VIH

Manufacturer’s ID

(BFH) Device ID2

2. Device ID = 5BH for SST49LF080A

See Table 11

T10.0 25026

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