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W28V400B Datasheet, PDF (12/48 Pages) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY
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W28V400B/T
Table 3.1. Bus Operations (#BYTE = VIH) (Note 1, 2)
MODE
Read (Note 8)
Output Disable
Standby (Note 10)
Deep Power-down
(Note 4, 10)
#RESET
VIH or
VHH
VIH or
VHH
VIH or
VHH
VIL
#CE
VIL
VIL
VIH
X
#OE
VIL
VIH
X
X
#WE ADDRESS VPP DQ0 − 15 RY/#BY(3)
VIH
X
X
DOUT
X
VIH
X
X
High Z
X
X
X
X
High Z
X
X
X
X
High Z
VOH
Read Identifier Codes
(Note 8)
VIH or
VHH
VIL
VIL
VIH
See
Figure 4
X
Note 5
VOH
Write (Note 6, 7, 8)
VIH or
VHH
VIL
VIH
VIL
X
X
DIN
X
Table 3.2. Bus Operations (#BYTE = VIL) (Note 1, 2)
MODE
#RESET #CE #OE #WE ADDRESS VPP DQ0 − 7 DQ8 − 15 RY/#BY(3)
Read (Note 8)
Output Disable
VIH or
VHH
VIL
VIL
VIH
X
VIH or
VHH
VIL
VIH
VIH
X
X
DOUT High Z
X
X High Z High Z
X
Standby (Note 10)
Deep Power-down
(Note 4, 10)
VIH or
VHH
VIH
X
X
X
X High Z High Z
X
VIL
XXX
X
X High Z High Z
VOH
Read Identifier Codes
(Note 8, 9)
VIH or
VHH
VIL
VIL
VIH
See Figure
4
X
Note 5 High Z
VOH
Write (Note 6, 7, 8)
VIH or
VHH
VIL
VIH
VIL
X
X
DIN
X
X
Notes:
1. Refer to DC Characteristics. When VPP ≤ VPPLK, memory contents can be read, but not altered.
2. X can be VIL or VIH for control pins and addresses, and VPPLK or VPPH1/2/3 for VPP. See DC Characteristics for VPPLK and VPPH1/2/3
voltages.
3. RY/#BY is VOL when the WSM is executing internal block erase or word/byte write algorithms. It is VOH during when the WSM
is not busy, in block erase suspend mode (with word/byte write inactive), word/byte write suspend mode or deep power-down
mode.
4. #RESET at VSS ±0.2V ensures the lowest deep power-down current.
5. See Read Identifier Codes Command section for details.
6. Command writes involving block erase or word/byte write are reliably executed when VPP = VPPH1/2/3 and VDD = VDD1/2/3/4. Block
erase or word/byte write with VIH < #RESET < VHH produce spurious results and should not be attempted.
7. Refer to Table 4 for valid DIN during a write operation.
8. Never hold #OE low and #WE low at the same timing.
9. A-1 set to VIL or VIH in byte mode (#BYTE = VIL).
10. #WP set to VIL or VIH.
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