参数资料
型号: M29F400BT45M1E
厂商: STMICROELECTRONICS
元件分类: PROM
英文描述: 256K X 16 FLASH 5V PROM, 45 ns, PDSO44
封装: 0.525 INCH, LEAD FREE, PLASTIC, SOP-44
文件页数: 6/40页
文件大小: 371K
代理商: M29F400BT45M1E
Bus operations
M29F400BT, M29F400BB
3.5
Automatic Standby
If CMOS levels (VCC ± 0.2V) are used to drive the bus and the bus is inactive for 150ns or
more the memory enters Automatic Standby where the internal Supply Current is reduced to
the CMOS Standby Supply Current, ICC3. The Data Inputs/Outputs will still output data if a
Bus Read operation is in progress.
3.6
Special bus operations
Additional bus operations can be performed to read the Electronic Signature and also to
apply and remove Block Protection. These bus operations are intended for use by
programming equipment and are not usually used in applications. They require VID to be
applied to some pins.
3.6.1
Electronic Signature
The memory has two codes, the manufacturer code and the device code, that can be read
to identify the memory. These codes can be read by applying the signals listed in Table 2.
and Table 3., Bus Operations.
3.6.2
Block Protection and Blocks Unprotection
Each block can be separately protected against accidental Program or Erase. Protected
blocks can be unprotected to allow data to be changed.
There are two methods available for protecting and unprotecting the blocks, one for use on
programming equipment and the other for in-system use. For further information refer to
Application Note AN1122, Applying Protection and Unprotection to M29 Series Flash.
Table 2.
Bus operations, BYTE = VIL
(1)
1.
X = VIL or VIH.
Operation
E
G
W
Address Inputs
DQ15A–1, A0-A17
Data Inputs/Outputs
DQ14-DQ8
DQ7-DQ0
Bus Read
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
Standby
VIH
X
Hi-Z
Read Manufacturer
Code
VIL
VIH
A0 = VIL, A1 = VIL, A9
= VID, Others VIL or VIH
Hi-Z
20h
Read Device Code
VIL
VIH
A0 = VIH, A1 = VIL, A9
= VID, Others VIL or VIH
Hi-Z
D5h (M29F400BT)
D6h (M29F400BB)
相关PDF资料
PDF描述
M29F400FB55M3F2 256K X 16 FLASH 5V PROM, 55 ns, PDSO44
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M29W800B-120N5RTR 1M X 8 FLASH 3V PROM, 120 ns, PDSO48
M29W800T-150M6 1M X 8 FLASH 3V PROM, 150 ns, PDSO44
M29W800FB9N3F 512K X 16 FLASH 3V PROM, 90 ns, PDSO48
相关代理商/技术参数
参数描述
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M29F400BT55M1 功能描述:闪存 512Kx8 or 256Kx16 55 RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
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M29F400BT70M1 功能描述:闪存 512Kx8 or 256Kx16 70 RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel