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參數(shù)資料
型號(hào)： W29C020-70A
廠(chǎng)商： WINBOND ELECTRONICS CORP
元件分類(lèi)： PROM
英文描述： 256K X 8 CMOS FLASH MEMORY
中文描述： 256K X 8 FLASH 5V PROM, 70 ns, PDIP32
封裝： 0.600 INCH, PLASTIC, DIP-32
文件頁(yè)數(shù)： 5/21頁(yè)
文件大小： 267K
代理商： W29C020-70A
W29C020
Publication Release Date: February 1998
- 5 -
Revision A3
Toggle Bit (DQ6)- Write Status Detection
In addition to data polling, the W29C020 provides another method for determining the end of a write
cycle. During the internal write cycle, any consecutive attempts to read DQ6 will produce alternating
0's and 1's. When the write cycle is completed, this toggling between 0's and 1's will stop. The device
is then ready for the next operation. See Toggle Bit Timing Diagram.
Product Identification
The product ID operation outputs the manufacturer code and device code. The programming
equipment automatically matches the device with its proper erase and programming algorithms.
The manufacturer and device codes can be accessed through software or by hardware operation. In
the software access mode, a six-byte command sequence can be used to access the product ID. A
read from address "00000 hex" outputs the manufacturer code "DA hex." A read from address "00001
hex" outputs the device code "45 hex." The product ID operation can be terminated by a three-byte
command sequence.
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
Operating Range: 0 to 70
°
C (Ambient Temperature), V
DD
= 5V
±
10%, V
SS
= 0V, V
HH
= 12V
MODE
PINS
CE
V
IL
OE
V
IL
WE
V
IH
ADDRESS
DQ.
Read
A
IN
Dout
Write
V
IL
V
IH
V
IL
A
IN
Din
Standby
V
IH
X
X
X
High Z
Write Inhibit
X
V
IL
X
X
High Z/D
OUT
X
X
V
IH
X
High Z/D
OUT
Output Disable
X
V
IH
X
X
High Z
5-Volt Software Chip Erase
V
IL
V
IH
V
IL
A
IN
D
IN
Product ID
V
IL
V
IL
V
IH
A0 = V
IL
; A1
A17 = V
IL
;
A9 = V
HH
Manufacturer Code DA
(Hex)
V
IL
V
IL
V
IH
A0 = V
IH
; A1
A17 = V
IL
;
A9 = V
HH
Device Code
45 (Hex)
相關(guān)PDF資料
PDF描述
W29C022 256K x 8 CMOS FLASH MEMORY
W29C040T-90 512K X 8 CMOS FLASH MEMORY
W29C040P-90 512K X 8 CMOS FLASH MEMORY
W29C040 512K X 8 CMOS FLASH MEMORY
W29C040P-12 512K X 8 CMOS FLASH MEMORY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W29C020-70B 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:256K X 8 CMOS FLASH MEMORY
W29C020-90 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:256K X 8 CMOS FLASH MEMORY
W29C020-90A 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:256K X 8 CMOS FLASH MEMORY
W29C020-90B 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:256K X 8 CMOS FLASH MEMORY
W29C020C 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:256K X 8 CMOS FLASH MEMORY
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