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W29C020S-70B Fiches technique(PDF) 5 Page - Winbond

No de pièce W29C020S-70B
Description  256K X 8 CMOS FLASH MEMORY
Download  21 Pages
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Fabricant  WINBOND [Winbond]
Site Internet  http://www.winbond.com
Logo WINBOND - Winbond

W29C020S-70B Fiches technique(HTML) 5 Page - Winbond

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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), VDD = 5V ±10%, VSS = 0V, VHH = 12V
MODE
PINS
CE
OE
WE
ADDRESS
DQ.
Read
VIL
VIL
VIH
AIN
Dout
Write
VIL
VIH
VIL
AIN
Din
Standby
VIH
X
X
X
High Z
Write Inhibit
X
VIL
X
X
High Z/DOUT
X
X
VIH
X
High Z/DOUT
Output Disable
X
VIH
X
X
High Z
5-Volt Software Chip Erase
VIL
VIH
VIL
AIN
DIN
Product ID
VIL
VIL
VIH
A0 = VIL; A1
−A17 = VIL;
A9 = VHH
Manufacturer Code DA
(Hex)
VIL
VIL
VIH
A0 = VIH; A1
−A17 = VIL;
A9 = VHH
Device Code
45 (Hex)


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