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SST31LF041_03 Datasheet, PDF (8/26 Pages) Silicon Storage Technology, Inc – 4 Mbit Flash + 1 Mbit SRAM ComboMemory
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4 Mbit Flash + 1 Mbit SRAM ComboMemory
SST31LF041 / SST31LF041A
Preliminary Specifications
TABLE 3: OPERATION MODES SELECTION
Mode
BES#1 BEF#1 OE#
Flash
Read
Program
Erase
X2
VIL
VIL
X
VIL
VIH
X
VIL
VIH
WE# A9 DQ
VIH AIN DOUT
VIL AIN DIN
VIL X X
SRAM
Read
Write
Standby
Flash Write Inhibit
Product Identification
Hardware Mode
Software Mode
VIL
VIL
VIHC
X
X
X
X
X
VIH
VIH
VIHC
X
X
VIH
VIL
VIL
VIL
VIH AIN DOUT
X
VIL AIN DIN
X
X X High Z
VIL
X
X High Z / DOUT
X
VIH X High Z / DOUT
X
X
X High Z / DOUT
VIL VIH VH Manufacturer’s ID (BFH)
Device ID3
VIL
VIH AIN ID Code
1. BES# and BEF# cannot be asserted simultaneously. For SST31LF041A BES# and OE# share pin 32.
When flash is active, pin 32 becomes OE#. When flash is inactive, pin 32 becomes BES#.
2. X can be VIL or VIH, but no other value.
3. Device ID 17H for SST31LF041 and 16H for SST31LF041A.
Address
AIN
AIN
Sector address,
XXH for Bank-Erase
AIN
AIN
X
X
X
X
A18-A1=VIL, A0=VIL
A18-A1=VIL, A0=VIH
See Table 4
T3.9 1107
TABLE 4: SOFTWARE COMMAND SEQUENCE
Command
Sequence
1st Bus
Write Cycle
Addr1 Data
Byte-Program
5555H AAH
Sector-Erase
5555H AAH
Bank-Erase
5555H AAH
Software ID Entry4,5 5555H AAH
Software ID Exit
5555H AAH
2nd Bus
Write Cycle
Addr1 Data
2AAAH 55H
2AAAH 55H
2AAAH 55H
2AAAH 55H
2AAAH 55H
3rd Bus
Write Cycle
Addr1 Data
5555H A0H
5555H 80H
5555H 80H
5555H 90H
5555H F0H
4th Bus
Write Cycle
Addr1 Data
BA2 Data
5555H AAH
5555H AAH
5th Bus
Write Cycle
Addr1 Data
2AAAH 55H
2AAAH 55H
1. Address format A14-A0 (Hex), Address A18-A15 can be VIL or VIH, but no other value, for the Command sequence.
2. BA = Program Byte address
3. SAX for Sector-Erase; uses A18-A12 address lines
4. The device does not remain in Software Product ID mode if powered down.
5. With A18-A1 = 0; SST Manufacturer’s ID = BFH, is read with A0 = 0,
SST31LF041 Device ID = 17H, is read with A0 = 1,
SST31LF041A Device ID = 16H, is read with A0 = 1
6th Bus
Write Cycle
Addr1 Data
SAX3 30H
5555H 10H
T4.7 1107
©2003 Silicon Storage Technology, Inc.
8
S71107-05-000
12/03
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