TS80C51RA2-LCB Atmel, TS80C51RA2-LCB Datasheet - Page 55
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TS80C51RA2-LCB
Manufacturer Part Number
TS80C51RA2-LCB
Description
IC MCU 8BIT 256BYTE 30MHZ 44PLCC
Manufacturer
Atmel
Series
80Cr
Specifications of TS80C51RA2-LCB
Core Processor
8051
Core Size
8-Bit
Speed
30/20MHz
Connectivity
UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
32
Program Memory Type
ROMless
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TS80C51RA2-LCB
Manufacturer:
TEMIC
Quantity:
114
8.4. EPROM Erasure (Windowed Packages Only)
Erasing the EPROM erases the code array, the encryption array and the lock bits returning the parts to full
functionality.
Erasure leaves all the EPROM cells in a 1’s state (FF).
8.4.1. Erasure Characteristics
The recommended erasure procedure is exposure to ultraviolet light (at 2537 Å) to an integrated dose at least 15
W-sec/cm
of about 25 mm, should be sufficient. An exposure of 1 hour is recommended with most of standard erasers.
Erasure of the EPROM begins to occur when the chip is exposed to light with wavelength shorter than approximately
4,000 Å. Since sunlight and fluorescent lighting have wavelengths in this range, exposure to these light sources
over an extended time (about 1 week in sunlight, or 3 years in room-level fluorescent lighting) could cause
inadvertent erasure. If an application subjects the device to this type of exposure, it is suggested that an opaque
label be placed over the window.
Rev. C - 06 March, 2001
2
ALE/PROG
. Exposing the EPROM to an ultraviolet lamp of 12,000 W/cm
A0-A12
EA/VPP
Control sig-
nals
D0-D7
12.75V
5V
0V
Figure 19. Programming and Verification Signal’s Waveform
Programming Cycle
Data In
100 s
Read/Verify Cycle
Data Out
2
rating for 30 minutes, at a distance
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
TS80C51RA2/RD2
55