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PROM VERSION
18.1 EPROM mode
Table 18.1.4 Built-in PROM state in EPROM mode
Pin name
Mode
Read-out
Output
disable
Program
Program verify
Program disable
: It may be V
or V
IL
(1) Read
___
When CE and OE pins are set to "L" level and an address is input to address input pins, the data
of the specified address, input address, is output externally from data I/O pins.
___
When CE and OE pins are set to "H" level, data I/O pins enter the floating state.
(2) Program (Write)
___
When CE pin is set to "L" level and
programming to the built-in PROM becomes possible.
Input an address to address input pins and supply data to be programmed to data I/O pins in 8-bit
parallel. In this condition, when
address, input address, into the built-in PROM.
(3) Erase (Possible only in EPROM version)
The contents of the built-in PROM is erased by exposing the glass window on top of the package
to an ultraviolet light which has a wave length of 2537 Angstrom. The light must be 15 J/cm
18–6
OE
CE
V
V
IL
IL
V
V
IL
IH
V
IH
V
V
IL
IH
V
V
IL
IL
V
V
IH
IH
.
IH
___
___
____
PGM
7751 Group User's Manual
PGM
V
PP
5 V
5 V
5 V
V
12.5 V
IL
V
12.5 V
IH
V
12.5 V
IH
___
pin is set to "H" level and V
OE
pin is set to "L" level, the data is programmed at the specified
Vcc
Data I/O
5 V
Output
5 V
Floating
Floating
5 V
Input
6 V
6 V
Output
6 V
Floating
level is applied to V
PP
pin,
PP
2
or more.
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