59
AT/TSC8x251G2D
4135F–8051–11/06
Timings
Table 51.
EPROM Programming AC timings; VDD = 4.5 to 5.5 V, TA = 0 to 40°C
Table 52.
EPROM Verifying AC timings; VDD = 4.5 to 5.5 V, VDD = 2.7 to 5.5 V, TA = 0 to
40
°C
Waveforms
Figure 23.
EPROM Programming Waveforms
Symbol
Parameter
Min
Max
Unit
TOSC
XTAL1 Period
83.5
250
ns
TAVGL
Address Setup to PROG# low
48
TOSC
TGHAX
Address Hold after PROG# low
48
TOSC
TDVGL
Data Setup to PROG# low
48
TOSC
TGHDX
Data Hold after PROG#
48
TOSC
TELSH
ENABLE High to VPP
48
TOSC
TSHGL
VPP Setup to PROG# low
10
μs
TGHSL
VPP Hold after PROG#
10
μs
TSLEH
ENABLE Hold after VPP
0ns
TGLGH
PROG# Width
90
110
μs
Symbol
Parameter
Min
Max
Unit
TOSC
XTAL1 Period
83.5
250
ns
TAVQV
Address to Data Valid
48
TOSC
TAXQX
Address to Data Invalid
0
ns
TELQV
ENABLE low to Data Valid
0
48
TOSC
TEHQZ
Data Float after ENABLE
0
48
TOSC
T
SLEH
T
ELSH
T
DVGL
T
SHGL
T
AVGL
T
GHAX
T
GHDX
T
GLGH
T
GHSL
VPP
VDD
V
SS
P1 = A15:8
P3 = A7:0
P2 = D7:0
EA#/VPP
ALE/PROG#
P0
Mode = 68h, 69h, 6Bh or 6Ch
Data
Address