SST38VF6402 datasheet(14/64 Pages) MICROCHIP

14 / 64 page

DS-20005015B

08/15

64 Mbit (x16) Advanced Multi-Purpose Flash Plus

SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404

Not Recommended for New Designs

RY/BY#

The RY/BY# pin can be used to determine the status of a Program or Erase operation. The RY/BY# pin

is valid after the rising edge of the final WE# pulse in the command sequence. If RY/BY# = 0, then the

device is actively programming or erasing. If RY/BY# = 1, the device is in Read mode. The RY/BY# pin

is an open drain output pin. This means several RY/BY# can be tied together with a pull-up resistor to

VDD..

Data Protection

The SST38VF6401/6402/6403/6404 provide both hardware and software features to protect nonvolatile

data from inadvertent writes.

Hardware Data Protection

Noise/Glitch Protection: A WE# or CE# 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, CE# high, or WE# high will inhibit the Write operation. This pre-

vents inadvertent writes during power-up or power-down.

Table 4: Write Operation Status

Status

DQ71

1. DQ7 and DQ2 require a valid address when reading status information.

DQ6

DQ21

DQ1

RY/BY#2

2. RY/BY# is an open drain pin. RY/BY# is high in Read mode, and Read in Erase-Suspend mode.

Normal

Operation

Standard Program

DQ7#

Toggle

No Toggle

Standard Erase

Toggle

N/A

Erase-Suspend Mode

Read from Erase-Suspended

Sector/Block

No toggle

Toggle

N/A

Read from Non- Erase-

Suspended Sector/Block

Data

Program

DQ7#

Toggle

N/A

Program Buffer-to-Flash

Busy

DQ7#3

3. During a Program Buffer-to-Flash operation, the datum on the DQ7 pin is the complement of DQ7 of the last word

loaded in the Write-Buffer using the Write-to-Buffer command.

Toggle

N/A

Abort

DQ7#3 Toggle

N/A

T4.0 20005015

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