M29W400 ST Microelectronics, M29W400 Datasheet - Page 17

• Manufacturer Part Number: M29W400
• Description: 4 Mbit 512Kb x8 or 256Kb x16 / Boot Block Low Voltage Single Supply Flash Memory
• Manufacturer: ST Microelectronics

Table 15A. Write AC Characteristics, Write Enable Controlled
(T
Notes: 1. Sample only, not 100% tested.
Program (PG) Instruction. This instruction uses
four write cycles. Both for Byte-wide configuration
and for Word-wide configuration. The Program
command A0h is written to address AAAAh in the
Byte-wide configuration or to address 5555h in the
Word-wide configurationon the third cycle after two
Coded cycles. A fourth write operation latches the
Address on the falling edge of W or E and the Data
to be written on the rising edge and starts the
t
PHPHH
A
Symbol
t
t
WHRL
PHWL
t
t
t
t
t
t
t
t
t
t
t
VCHEL
WHGL
t
t
WHWL
WLWH
DVWH
WHDX
WHEH
GHWL
= 0 to 70 C, –20 to 85 C or –40 to 85 C)
AVWL
WLAX
ELWL
PLPX
AVAV
2. This timing is for Temporary Block Unprotection operation.
(1,2)
(1)
(1)
t
t
t
t
t
BUSY
t
t
t
WPH
VIDR
Alt
t
t
t
t
t
t
OEH
t
VCS
RSP
WC
WP
CS
DS
DH
CH
AS
AH
RP
Address Valid to Next Address Valid
Chip Enable Low to Write Enable Low
Write Enable Low to Write Enable High
Input Valid to Write Enable High
Write Enable High to Input Transition
Write Enable High to Chip Enable High
Write Enable High to Write Enable Low
Address Valid to Write Enable Low
Write Enable Low to Address Transition
Output Enable High to Write Enable Low
V
Write Enable High to Output Enable Low
RP Rise Time to V
RP Pulse Width
Program Erase Valid to RB Delay
RP High to Write Enable Low
CC
High to Chip Enable Low
Parameter
ID
P/E.C. Read operations output the Status Register
bits after the programming has started. Memory
programming is made only by writing ’0’ in place of
’1’. Statusbits DQ6 and DQ7 determine if program-
ming is on-going and DQ5 allows verification of any
possible error. Programming at an address not in
blocks being erased is also possible during erase
suspend. In this case, DQ2 will toggle at the ad-
dress being programmed.
V
CC
Min
500
500
90
45
45
30
45
50
0
0
0
0
0
0
4
C
= 3.0V to 3.6V
L
= 30pF
-90
M29W400T / M29W400B
Max
90
M29W400T, M29W400B
V
CC
Min
100
500
500
50
50
30
50
50
0
0
0
0
0
0
4
C
= 2.7V to 3.6V
L
-100
= 30pF
Max
90
Unit
17/34
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s