M29W400B STMICROELECTRONICS [STMicroelectronics], M29W400B Datasheet - Page 21

• Manufacturer Part Number: M29W400B
• Description: 4 Mbit 512Kb x8 or 256Kb x16, Boot Block Low Voltage Single Supply Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 16B. Write AC Characteristics, Chip Enable Controlled
(T
Notes: 1. Sample only, not 100% tested.
Erase Resume (ER) Instruction. If an Erase Sus-
pend instruction was previously executed, the
erase operation may be resumed by giving the
command 30h, at any address, and without any
Coded cycles.
POWER SUPPLY
Power Up
The memory Command Interfaceis reset on power
up to Read Array. Either E or W must be tied to V
t
PHPHH
Symbol
A
t
t
t
PHWL
EHRL
t
t
t
t
t
VCHWL
t
t
t
t
t
t
t
EHWH
WLEL
DVEH
EHDX
GHEL
EHGL
= 0 to 70 C, –20 to 85 C or –40 to 85 C)
AVAV
ELEH
EHEL
AVEL
ELAX
PLPX
2. This timing is for Temporary Block Unprotection operation.
(1,2)
(1)
(1)
t
t
t
t
t
BUSY
t
t
t
t
VIDR
Alt
t
t
t
t
OEH
t
CPH
t
VCS
RSP
WC
WS
WH
CP
DS
DH
AS
AH
RP
Address Valid to Next Address Valid
Write Enable Low to Chip Enable Low
Chip Enable Low to Chip Enable High
Input Valid to Chip Enable High
Chip Enable High to Input Transition
Chip Enable High to Write Enable High
Chip Enable High to Chip Enable Low
Address Valid to Chip Enable Low
Chip Enable Low to Address Transition
Output Enable High Chip Enable Low
V
Chip 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 Write Enable Low
Parameter
ID
IH
during Power Up to allow maximum security and
the possibility to write a command on the first rising
edge of E and W. Any write cycle initiation is
blocked when Vcc is below V
Supply Rails
Normal precautions must be taken for supply volt-
age decoupling; each device in a system should
have the V
close to the V
widths should be sufficient to carry the V
gram and erase currents required.
V
CC
Min
120
500
500
50
50
30
50
50
0
0
0
0
0
0
4
= 2.7V to 3.6V
CC
-120
M29W400T / M29W400B
rail decoupled with a 0.1 F capacitor
CC
Max
90
and V
M29W400T, M29W400B
V
SS
CC
Min
150
500
500
50
50
35
50
50
0
0
0
0
0
0
4
pins. The PCB trace
= 2.7V to 3.6V
LKO
-150
.
Max
90
CC
Unit
21/34
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pro-
s
s