W29C020CP90B Winbond Electronics, W29C020CP90B Datasheet - Page 5

• Manufacturer Part Number: W29C020CP90B
• Description: IC FLASH 2MBIT 90NS 32PLCC
• Manufacturer: Winbond Electronics

Specifications of W29C020CP90B

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 2M (256K x 8)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q1321111

Toggle Bit (DQ6)- Write Status Detection
In addition to data polling, the W29C020C 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.
Note: The hardware SID read function is not included in all parts; please refer to Ordering Information for details.
TABLE OF OPERATING MODES
Operating Mode Selection
Operating Range: 0 to 70 C (Ambient Temperature), V
Read
Write
Standby
Write Inhibit
Output Disable
5-Volt Software Chip
Erase
Product ID
MODE
#CE
V
V
V
V
V
V
X
X
X
IH
IL
IL
IL
IL
IL
#OE
V
V
V
V
V
V
V
X
X
IH
IH
IH
IL
IL
IL
IL
#WE
V
V
V
V
V
V
X
X
X
IH
IH
IH
IH
IL
IL
DD
= 5V 10 %, V
A
A
X
X
X
X
A
A0 = V
A9 = V
A0 = V
A9 = V
IN
IN
IN
- 5 -
IL
HH
IH
HH
ADDRESS
; A1
; A1
SS
PINS
Publication Release Date: February 18, 2002
= 0V, V
A17 = V
A17 = V
HH
= 12V
IL
IL
;
;
Dout
Din
High Z
High Z/D
High Z/D
High Z
D
Manufacturer Code DA
(Hex)
Device Code
45 (Hex)
IN
W29C020C
OUT
OUT
DQ.
Revision A4