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参数资料
| 型号： | W49F002U-90 |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | PROM |
| 英文描述： | 256K X 8 FLASH 5V PROM, 90 ns, PDIP32 |
| 封装： | PLASTIC, DIP-32 |
| 文件页数： | 19/23页 |
| 文件大小： | 303K |
| 代理商： | W49F002U-90 |
W49F002U
Publication Release Date: April 2000
- 5 -
Revision A2
Toggle Bit (DQ6)- Write Status Detection
In addition to data polling, the W49F002U provides another method for determining the end of a
program cycle. During the internal program or erase cycle, any consecutive attempts to read DQ6 will
produce alternating 0's and 1's. When the program or erase cycle is completed, this toggling between
0's and 1's will stop. The device is then ready for the next operation.
Product Identification
The product ID operation outputs the manufacturer code and device code. Programming equipment
automatically matches the device with its proper erase and programming algorithms.
The manufacturer and device codes can be accessed by software or hardware operation. In the
software access mode, a three-byte (or JEDEC 3-byte) command sequence can be used to access
the product ID. A read from address 0000H outputs the manufacturer code DA(hex). A read from
address 0001H outputs the device code 0B(hex). The product ID operation can be terminated by a
three-byte command code sequence or an alternate one-byte command code sequence (see
Command Definition table).
In the hardware access mode, access to the product ID is activated by forcing CE and OE low, WE
high, and raising A9 to 12 volts.
TABLE OF OPERATING MODES
Operating Mode Selection
(VHH = 12V
± 5%)
MODE
PINS
RESET
CE
OE
WE
ADDRESS
DQ.
Read
VIH
VIL
VIH
AIN
Dout
Write
VIH
VIL
VIH
VIL
AIN
Din
Standby
VIH
X
High Z
Write Inhibit
VIH
X
VIL
X
High Z/DOUT
VIH
X
VIH
X
High Z/DOUT
Output Disable
VIH
X
VIH
X
High Z
Reset Mode
VIL
X
High Z
Product ID
VIH
VIL
VIH
A0 = VIL; A1
A17 = VIL;
A9 = VHH
Manufacturer Code DA (Hex)
VIH
VIL
VIH
A0 = VIH; A1
A17 = VIL;
A9 = VHH
Device Code 0B (Hex)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| W49F002U-90B | 制造商:WINBOND 制造商全称:Winbond 功能描述:256K X 8 CMOS FLASH MEMORY |
| W49F002UP12B | 制造商:WINBOND 制造商全称:Winbond 功能描述:256K X 8 CMOS FLASH MEMORY |
| W49F002UP70B | 制造商:WINBOND 制造商全称:Winbond 功能描述:256K X 8 CMOS FLASH MEMORY |
| W49F002UP90B | 制造商:WINBOND 制造商全称:Winbond 功能描述:256K X 8 CMOS FLASH MEMORY |
| W49F002UT12B | 制造商:WINBOND 制造商全称:Winbond 功能描述:256K X 8 CMOS FLASH MEMORY |
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