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8051AHP View Datasheet(PDF) - Intel

Part NameDescriptionManufacturer
8051AHP MCS@51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS Intel
Intel Intel
8051AHP Datasheet PDF : 21 Pages
First Prev 11 12 13 14 15 16 17 18 19 20
MCS” 51 CONTROLLER
ERASURE CHARACTERISTICS
Erasure of the EPROM begins to occur when the
8752BH is exposed to light with wavelengths shorter
than approximately 4,000 Angstroms. Since sunlight
and fluorescent lighting have wavelengths in this
range, exposure to these light sources over an ex-
tended time (about 1 week in sunlight, or 3 years in
room-level fluorescent lighting) could cause inadver-
tent erasure. If an application subjects the device to
this type of exposure, it is suggested that an opaque
label be placed over the window.
The recommended erasure procedure is exposure
to ultraviolet light (at 2537 Angstroms) to an integrat-
ed dose of at lease 15 W-see/cm. Exposing the
EPROM to an ultraviolet lamp of 12,000 pW/cm rat-
ing for 30 minutes, at a distance of about 1 inch,
should be sufficient.
Erasure leaves the array in an all Is state.
EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS
(T,4 = 21°C to 27”C, Vcc = 5.OV + 10%, Vss = OV)
Symbol
Parameter
Min
Max
Vpp
Programming Supply Voltage
12.5
13.0
Ipp
Programming Supply Current
50
1/TCLCL
Oscillator Frequency
4
8
TAVGL
Address Setup to PROG Low
48TCLCL
TGHAX
Address Hold After PROG
48TCLCL
TDVGL
Data Setup to PROG Low
48TCLCL
TGHDX
Data Hold After PROG
48TCLCL
TEHSH
P2.7 (ENABLE) High to Vpp
48TCLCL
TSHGL
Vpp Setup to PROG Low
10
TGHSL
TGLGH
TAVQV
Vpp Hold After PROG
PROG Width
Address to Data Valid
10
90
110
48TCLCL
TELQV
TEHQZ
ENABLE Low to Data Valid
Data Float After ENABLE
48TCLCL
o
48TCLCL
TGHGL
PROG High to PROG Low
10
Units
v
mA
MHz
ps
ps
ps
ps
EPROM PROGRAMMING AND VERIFICATION WAVEFORMS
‘::=&z
PROGRAMMING
ADDRESS
TDVGL
TAVGL
DATA IN
~
Pu&
.~-TGHDX
TGHAX
VERIFICATION
ADDRFSS
TAvQV
DATA OUT
}
~wpp
P2.7
TSHGL
TGLGH
d
TGHGL
TGHsL
t
[A/HIGH
TELQV
L
TEHQZ
272318-18
20
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