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參數(shù)資料
| 型號： | L29S800F |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8MEGABIT (1M】8 /512K】16) 3 VOLT CMOS FLASH MEMERY |
| 中文描述： | 8MEGABIT（100萬】8 / 16】為512k）3伏的CMOS閃存MEMERY |
| 文件頁數(shù)： | 9/54頁 |
| 文件大?。?/td> | 797K |
| 代理商： | L29S800F |
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L29S800F
PRELIMINARY
A
8MEGABIT (1M×8 /512K×16)
3 VOLT CMOS FLASH MEMERY
LinkSmart
■
FUNCTIONAL DESCRIPTION
Read Mode
The L29S800F/-B have two control functions which must be satisfied in order to obtain data at the
outputs.
CE
is the power control and should be used for a device selection.
OE
is the output control
and should be used to gate data to the output pins if a device is selected.
Address access time (t
ACC
) is equal to the delay from stable addresses to valid output data. The chip
enable access time (t
CE
) is the delay from stable addresses and stable
CE
to valid data at the output
pins. The output enable access time is the delay from the falling edge of
OE
to valid data at the output
pins. (Assuming the addresses have been stable for at least t
ACC
-t
OE
time.) When reading out a data
without changing addresses after power-up, it is necessary to input hardware reset or change
CE
pin
from “H” or “L”
Standby Mode
There are two ways to implement the standby mode on the L29S800F/-B devices, one using both the
CE
and
RESET
pins; the other via the
RESET
pin only.
9
071802
When using both pins, a CMOS standby mode is achieved with
CE
and
RESET
inputs both held at
V
CC
± 0.3 V. Under this condition the current consumed is less than 5
μ
A. The device can be read with
standard access time (t
CE
) from either of these standby modes. During Embedded Algorithm operation,
V
CC
active current (I
CC2
) is required even
CE
= “H”.
When using the
RESET
pin only, a CMOS standby mode is achieved with
RESET
input held at V
SS
±
0.3 V (
CE
= “H” or “L”). Under this condition the current is consumed is less than 5mA. Once the
RESET
pin is taken high, the device requires t
RH
of wake up time before outputs are valid for read
access.
In the standby mode the outputs are in the high impedance state, independent of the
OE
input.
Automatic Sleep Mode
There is a function called automatic sleep mode to restrain power consumption during read-out of
L29S800F/-B data. This mode can be used effectively with an application requested low power
consumption such as handy terminals.
To activate this mode, L29S800F/-B automatically switch themselves to low power mode when
L29S800F/-B addresses remain stably during access fine of 150 ns. It is not necessary to control
CE
,
WE
, and
OE
on the mode. Under the mode, the current consumed is typically 1
μ
A (CMOS Level).
Since the data are latched during this mode, the data are read-out continuously. If the addresses are
changed, the mode is canceled automatically and L29S800F/-B read-out the data for changed
addresses.
Output Disable
With the
OE
input at a logic high level (V
IH
), output from the devices are disabled. This will cause the
output pins to be in a high impedance state.
Autoselect
The autoselect mode allows the reading out of a binary code from the devices and will identify its
manufacturer and type. This mode is intended for use by programming equipment for the purpose of
automatically matching the devices to be programmed with its corresponding programming algorithm.
This mode is functional over the entire temperature range of the devices.
To activate this mode, the programming equipment must force V
ID
(11.5 V to 12.5 V) on address pin A
9
.
Two identifier bytes may then be sequenced from the devices outputs by toggling address A
0
from V
IL
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