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M29F400BT Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M29F400BT
Description  4 Mbit 512Kb x8 or 256Kb x16, Boot Block Single Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29F400BT Datasheet(HTML) 5 Page - STMicroelectronics

 
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M29F400BT, M29F400BB
Table 5. Bus Operations, BYTE = VIL
Note: X = VIL or VIH.
Table 6. Bus Operations, BYTE = VIH
Note: X = VIL or VIH.
Operation
E
G
W
Address Inputs
DQ15A–1, A0-A17
Data Inputs/Outputs
DQ14-DQ8
DQ7-DQ0
Bus Read
VIL
VIL
VIH
Cell Address
Hi-Z
Data Output
Bus Write
VIL
VIH
VIL
Command Address
Hi-Z
Data Input
Output Disable
X
VIH
VIH
X
Hi-Z
Hi-Z
Standby
VIH
X
X
X
Hi-Z
Hi-Z
Read Manufacturer
Code
VIL
VIL
VIH
A0 = VIL, A1 = VIL, A9 = VID,
Others VIL or VIH
Hi-Z
20h
Read Device Code
VIL
VIL
VIH
A0 = VIH, A1 = VIL, A9 = VID,
Others VIL or VIH
Hi-Z
D5h (M29F400BT)
D6h (M29F400BB)
Operation
E
G
W
Address Inputs
A0-A17
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Bus Read
VIL
VIL
VIH
Cell Address
Data Output
Bus Write
VIL
VIH
VIL
Command Address
Data Input
Output Disable
X
VIH
VIH
X
Hi-Z
Standby
VIH
X
X
X
Hi-Z
Read Manufacturer
Code
VIL
VIL
VIH
A0 = VIL, A1 = VIL, A9 = VID,
Others VIL or VIH
0020h
Read Device Code
VIL
VIL
VIH
A0 = VIH, A1 = VIL, A9 = VID,
Others VIL or VIH
00D5h (M29F400BT)
00D6h (M29F400BB)
BUS OPERATIONS
There are five standard bus operations that control
the device. These are Bus Read, Bus Write, Out-
put Disable, Standby and Automatic Standby. See
Tables 5 and 6, Bus Operations, for a summary.
Typically glitches of less than 5ns on Chip Enable
or Write Enable are ignored by the memory and do
not affect bus operations.
Bus Read. Bus Read operations read from the
memory cells, or specific registers in the Com-
mand Interface. A valid Bus Read operation in-
volves setting the desired address on the Address
Inputs, applying a Low signal, VIL, to Chip Enable
and Output Enable and keeping Write Enable
High, VIH. The Data Inputs/Outputs will output the
value, see Figure 8, Read Mode AC Waveforms,
and Table 14, Read AC Characteristics, for details
of when the output becomes valid.
Bus Write. Bus Write operations write to the
Command Interface. A valid Bus Write operation
begins by setting the desired address on the Ad-
dress Inputs. The Address Inputs are latched by
the Command Interface on the falling edge of Chip
Enable or Write Enable, whichever occurs last.
The Data Inputs/Outputs are latched by the Com-
mand Interface on the rising edge of Chip Enable
or Write Enable, whichever occurs first. Output En-
able must remain High, VIH, during the whole Bus
Write operation. See Figures 9 and 10, Write AC
Waveforms, and Tables 15 and 16, Write AC
Characteristics, for details of the timing require-
ments.
Output Disable. The Data Inputs/Outputs are in
the high impedance state when Output Enable is
High, VIH.
Standby. When Chip Enable is High, VIH, the
Data Inputs/Outputs pins are placed in the high-
impedance state and the Supply Current is re-
duced to the Standby level.
When Chip Enable is at VIH the Supply Current is
reduced to the TTL Standby Supply Current, ICC2.
To further reduce the Supply Current to the CMOS
Standby Supply Current, ICC3, Chip Enable should
be held within VCC ± 0.2V. For Standby current
levels see Table 13, DC Characteristics.
During program or erase operations the memory
will continue to use the Program/Erase Supply
Current, ICC4, for Program or Erase operations un-
til the operation completes.


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