M27V512 데이터 시트보기 (PDF) - STMicroelectronics
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M27V512 Datasheet PDF : 16 Pages
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M27V512
Table 8B. Read Mode AC Characteristics (1)
(TA = 0 to 70 °C or –40 to 85 °C; VCC = 3.3V ± 10%; VPP = VCC))
M27V512
Symbol Alt
Parameter
Test Condition
-150
-200
Unit
Min
Max Min Max
tAVQV
tACC Address Valid to Output Valid
E = VIL, G = VIL
150
200 ns
tELQV
tCE Chip Enable Low to Output Valid
G = VIL
150
200 ns
tGLQV
tOE Output Enable Low to Output Valid
E = VIL
50
60 ns
tEHQZ (2) tDF Chip Enable High to Output Hi-Z
G = VIL
0
40
0 50 ns
tGHQZ (2) tDF Output Enable High to Output Hi-Z
E = VIL
0
40
0 50 ns
tAXQX
tOH
Address Transition to Output
Transition
E = VIL, G = VIL
0
0
ns
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
Figure 5. Read Mode AC Waveforms
A0-A15
E
G
Q0-Q7
VALID
tAVQV
tGLQV
tELQV
tAXQX
VALID
tEHQZ
tGHQZ
Hi-Z
AI00735B
Programming
The M27V512 has been designed to be fully com-
patible with the M27C512 and has the same elec-
tronic signature. As a result the M27V512 can be
programmed as the M27C512 on the same pro-
gramming equipments applying 12.75V on VPP
and 6.25V on VCC by the use of the same PRES-
TO IIB algorithm. When delivered (and after each
erasure for UV EPROM), all bits of the M27V512
are in the ’1’ state. Data is introduced by selective-
ly programming ’0’s into the desired bit locations.
Although only ’0’s will be programmed, both ’1’s
and ’0’s can be present in the data word. The only
way to change a ’0’ to a ’1’ is by die exposure to ul-
traviolet light (UV EPROM). The M27V512 is in the
programming mode when VPP input is at 12.75V
and E is pulsed to VIL. The data to be programmed
is applied to 8 bits in parallel to the data output
pins.The levels required for the address and data
inputs are TTL. VCC is specified to be 6.25V ±
0.25V.
The M27V512 can use PRESTO IIB Programming
Algorithm that drastically reduces the program-
ming time (typically less than 6 seconds). Never-
theless to achieve compatibility with all
programming equipments, PRESTO Program-
ming Algorithm can be used as well.
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