PIC16C72-02/SS Microchip Technology, PIC16C72-02/SS Datasheet - Page 106

• Manufacturer Part Number: PIC16C72-02/SS
• Description: 8-Bit CMOS Microcontrollers with A/D Converter
• Manufacturer: Microchip Technology

PIC16C72 Series
FIGURE 14-29: TYPICAL I
TABLE 14-3
DS39016A-page 106
Note 1: If these criteria are not met, the erase times will be different.
Note:
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Technology
57K
77K
90K
120K
1 2
Process
6.0V
5.5V
5.0V
4.5V
4.0V
Fluorescent lights and sunlight both emit ultraviolet light at the erasure wavelength. Leaving a UV erasable
device’s window uncovered could cause, over time, the devices memory cells to become erased. The era-
sure time for a fluorescent light is about three years. While sunlight requires only about one week. To pre-
vent the memory cells from losing data an opaque label should be placed over the erasure window.
4
6
(HS MODE, 25 C)
TYPICAL EPROM ERASE TIME RECOMMENDATIONS
Frequency (MHz)
8
(Angstroms)
Wavelength
10
DD
2537
2537
2537
2537
12
vs. FREQUENCY
14
16
18
Intensity ( W/
PIC16C72
Preliminary
20
12,000
12,000
12,000
12,000
cm2)
FIGURE 14-30: MAXIMUM I
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
1 2
Distance from UV lamp
6.0V
5.5V
5.0V
4.5V
4.0V
4
(inches)
1
1
1
1
6
FREQUENCY
(HS MODE, -40 C TO 85 C)
Frequency (MHz)
8
1998 Microchip Technology Inc.
10
DD
12
Typical Time
vs.
14
(minutes)
15 - 20
20
40
60
16
18
(1)
20