87C51/80C51BH/80C31BH
EPROM PROGRAMMING, EPROM AND ROM VERIFICATION
CHARACTERISTICS:
(TA e 21 Cto27 C, VCC e 5V g10%, VSS e 0V)
Symbol
Parameter
Min
Max
Units
VPP
Programming Supply Voltage
12.5
13.0
V
IPP
Programming Supply Current
75
mA
1/TCLCL
Oscillator Frequency
4
6
MHz
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
m
s
TGHSL
VPP Hold After PROG
10
m
s
TGLGH
PROG Width
90
110
m
s
TAVQV
Address to Data Valid
48TCLCL
TELQV
ENABLE Low to Data Valid
48TCLCL
TEHQZ
Data Float After ENABLE
0
48TCLCL
TGHGL
PROG High to PROG Low
10
m
s
EPROM PROGRAMMING, EPROM AND ROM VERIFICATION WAVEFORMS
272335±23
For programming conditions see Figure 10.
5 pulses for the EPROM array, 25 pulses for the encryption table and lock bits.
20