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SST27SF256-70-3C-PH Datasheet(PDF) 2 Page - Silicon Storage Technology, Inc

Part # SST27SF256-70-3C-PH
Description  256 Kbit / 512 Kbit / 1 Mbit / 2 Mbit (x8) Many-Time Programmable Flash
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Manufacturer  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST27SF256-70-3C-PH Datasheet(HTML) 2 Page - Silicon Storage Technology, Inc

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Data Sheet
256 Kbit / 512 Kbit / 1 Mbit / 2 Mbit Multi-Purpose Flash
SST27SF256 / SST27SF512 / SST27SF010 / SST27SF020
©2001 Silicon Storage Technology, Inc.
S71152-02-000
5/01
502
on VPP pin, VDD = 5V (±5%), VIL on CE# pin, and VIH on
OE# pin. The programming mode for SST27SF512 is acti-
vated by asserting 12V (±5%) on OE#/VPP pin, VDD = 5V
(±5%), and VIL on CE# pin. These devices are pro-
grammed byte-by-byte with the desired data at the desired
address using a single pulse (CE# pin low for
SST27SF256/512 and PGM# pin low for SST27SF010/
020) of 20 µs. Using the MTP programming algorithm, the
Byte-Programming process continues byte-by-byte until
the entire chip has been programmed.
Chip-Erase Operation
The only way to change a data from a “0” to “1” is by electri-
cal erase that changes every bit in the device to “1”. Unlike
traditional EPROMs, which use UV light to do the Chip-
Erase, the SST27SF256/512/010/020 uses an electrical
Chip-Erase operation. This saves a significant amount of
time (about 30 minutes for each Erase operation). The
entire chip can be erased in a single pulse of 100 ms (CE#
pin low for SST27SF256/512 and PGM# pin for
SST27SF010/020). In order to activate the Erase mode for
SST27SF256/010/020, the 12V (±5%) is applied to VPP
and A9 pins, VDD = 5V (±5%), VIL on CE# pin, and VIH on
OE# pin. In order to activate Erase mode for SST27SF512,
the 12V (±5%) is applied to OE#/VPP and A9 pins, VDD =
5V (±5%), and VIL on CE# pin. All other address and data
pins are “don’t care”. The falling edge of CE# (PGM# for
SST27SF010/020) will start the Chip-Erase operation.
Once the chip has been erased, all bytes must be verified
for FFH. Refer to Figures 13, 14, and 15 for the flowcharts.
Product Identification Mode
The Product Identification mode identifies the devices as
the SST27SF256, SST27SF512, SST27SF010 and
SST27SF020 and manufacturer as SST. This mode may
be accessed by the hardware method. To activate this
mode for SST27SF256/010/020, the programming equip-
ment must force VH (12V±5%) on address A9 with VPP pin
at VDD (5V±10%) or VSS. To activate this mode for
SST27SF512, the programming equipment must force VH
(12V±5%) on address A9 with OE#/VPP pin at VIL. Two
identifier bytes may then be sequenced from the device
outputs by toggling address line A0. For details, see Tables
3, 4, and 5 for hardware operation.
TABLE
1: PRODUCT IDENTIFICATION
Address
Data
Manufacturer’s ID
0000H
BFH
Device ID
SST27SF256
0001H
A3H
SST27SF512
0001H
A4H
SST27SF010
0001H
A5H
SST27SF020
0001H
A6H
T1.1 502


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