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SST34HF1622C-70-4E-LSE Datasheet(PDF) 5 Page - Silicon Storage Technology, Inc

Part # SST34HF1622C-70-4E-LSE
Description  16 Mbit Concurrent SuperFlash 2/4/8 Mbit SRAM ComboMemory
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Manufacturer  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST34HF1622C-70-4E-LSE Datasheet(HTML) 5 Page - Silicon Storage Technology, Inc

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Advance Information
16 Mbit Concurrent SuperFlash + 2/4/8 Mbit SRAM ComboMemory
SST34HF1602C / SST34HF1622C / SST34HF1642C
SST34HF1642D / SST34HF1682D / SST34HF1622S / SST34HF1642S
5
©2004 Silicon Storage Technology, Inc.
S71256-00-000
3/04
Data Protection
The SST34HF16x2C/D/S provide both hardware and soft-
ware features to protect nonvolatile data from inadvertent
writes.
Hardware Data Protection
Noise/Glitch Protection: A WE# or BEF# 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, BEF# high, or WE#
high will inhibit the Write operation. This prevents inadvert-
ent writes during power-up or power-down.
Hardware Block Protection
The SST34HF16x2C/D/S provide a hardware block protec-
tion which protects the outermost 8 KWord in Bank 1. The
block is protected when WP# is held low. See Figures 1
and 2 for Block-Protection location.
A user can disable block protection by driving WP# high
thus allowing erase or program of data into the protected
sectors. WP# must be held high prior to issuing the write
command and remain stable until after the entire Write
operation has completed.
Hardware Reset (RST#)
The RST# pin provides a hardware method of resetting the
device to read array data. When the RST# pin is held low
for at least TRP, any in-progress operation will terminate and
return to Read mode (see Figure 19). When no internal
Program/Erase operation is in progress, a minimum period
of TRHR is required after RST# is driven high before a valid
Read can take place (see Figure 18).
The Erase operation that has been interrupted needs to be
reinitiated after the device resumes normal operation mode
to ensure data integrity. See Figures 18 and 19 for timing
diagrams.
Software Data Protection (SDP)
The SST34HF16x2C/D/S provide the JEDEC standard
Software Data Protection scheme for all data alteration
operations, i.e., Program and Erase. Any Program opera-
tion requires the inclusion of the three-byte sequence. The
three-byte load sequence is used to initiate the Program
operation, providing optimal protection from inadvertent
Write operations, e.g., during the system power-up or
power-down. Any Erase operation requires the inclusion of
six-byte sequence. The SST34HF16x2C/D/S are shipped
with the Software Data Protection permanently enabled.
See Table 7 for the specific software command codes. Dur-
ing SDP command sequence, invalid commands will abort
the device to Read mode within TRC. The contents of DQ15-
DQ8 are “Don’t Care” during any SDP command
sequence.
Security ID
The SST34HF16x2C/D/S devices offer a 256-bit Security
ID space. The Secure ID space is divided into two 128-bit
segments—one factory programmed segment and one
user programmed segment. The first segment is pro-
grammed and locked at SST with a unique, 128-bit num-
ber. The user segment is left un-programmed for the
customer to program as desired. To program the user seg-
ment of the Security ID, the user must use the Security ID
Word-Program command. End-of-Write status is checked
by reading the toggle bits. Data# Polling is not used for
Security ID End-of-Write detection. Once programming is
complete, the Sec ID should be locked using the User-Sec-
ID-Program-Lock-Out. This disables any future corruption
of this space. Note that regardless of whether or not the
Sec ID is locked, neither Sec ID segment can be erased.
The Secure ID space can be queried by executing a three-
byte command sequence with Query-Sec-ID command
(88H) at address 5555H in the last byte sequence. To exit
this mode, the Exit-Sec-ID command should be executed.
Refer to Table 7 for more details.


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