CAT28F020
FUNCTION TABLE (1)
Pins
Mode
Read
Output Disable
Standby
Signature (MFG)
Signature (Device)
Program/Erase
Write Cycle
Read Cycle
CE
V IL
V IL
V IH
V IL
V IL
V IL
V IL
V IL
OE
V IL
V IH
X
V IL
V IL
V IH
V IH
V IL
WE
V IH
V IH
X
V IH
V IH
V IL
V IL
V IH
V PP
V PPL
X
V PPL
X
X
V PPH
V PPH
V PPH
I/O
D OUT
High-Z
High-Z
31H
BDH
D IN
D IN
D OUT
Notes
A 0 = V IL , A 9 = 12V
A 0 = V IH , A 9 = 12V
See Command Table
During Write Cycle
During Write Cycle
WRITE COMMAND TABLE
Commands are written into the command register in one or two write cycles. The command register can be altered
only when V PP is high and the instruction byte is latched on the rising edge of WE. Write cycles also internally latch
addresses and data required for programming and erase operations.
Pins
First Bus Cycle
Second Bus Cycle
Mode
Operation
Address
D IN
Operation
Address
D IN
D OUT
Set Read
Read Sig. (MFG)
Read Sig. (Device)
Erase
Erase Verify
Program
Program Verify
Reset
Write
Write
Write
Write
Write
Write
Write
Write
X
X
X
X
A IN
X
X
X
00H
90H
90H
20H
A0H
40H
C0H
FFH
Read
Read
Read
Write
Read
Write
Read
Write
A IN
00
01
X
X
A IN
X
X
20H
D IN
FFH
D OUT
31H
BDH
D OUT
D OUT
Note:
1. Logic Levels: X = Logic ‘Do not care’ (V IH , V IL , V PPL , V PPH )
? 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-1029, Rev. F
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