M27V201 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M27V201' PDF : 15 Pages View PDF
M27V201
Table 8B. Read Mode AC Characteristics (1)
(TA = 0 to 70°C or –40 to 85 °C; VCC = 3.3V ± 10%; VPP = Vcc)
M27V201
Symbol Alt
Parameter
Test Conditi on
-180
-200
Min Max Min Max
tAVQV
tACC Address Valid to Output Valid
E = VIL, G = VIL
180
200
tELQV
tCE Chip Enable Low to Output Valid
G = VIL
180
200
tGLQV
tOE Output Enable Low to Output Valid
E = VIL
80
90
tEHQZ (2) tDF Chip Enable High to Output Hi-Z
G = VIL
0
50
0
70
tGHQZ (2) tDF Output Enable High to Output Hi-Z
E = VIL
0
50
0
70
tAXQX
tOH
Address Transition to Output
Transition
E = VIL, G = VIL
0
0
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
Unit
ns
ns
ns
ns
ns
ns
Figure 5. Read Mode AC Waveforms
A0-A17
E
G
Q0-Q7
VALID
tAVQV
tGLQV
tELQV
tAXQX
VALID
tEHQZ
tGHQZ
Hi-Z
AI00719B
Programming
The M27V201 has been designed to be fully com-
patible with the M27C2001 and has the same elec-
tronic signature. As a result the M27V201 can be
programmed as the M27C2001 on the same pro-
gramming equipments by applying 12.75V on VPP
and 6.25V on VCC by the use of the same PRES-
TO II algorithm. When delivered (and after each
erasure for UV EPROM), all bits of the M27V201
are in the ’1’ state.Data is introduced by selectively
programming ’0’s into the desired bit locations. Al-
though 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 exposition to ultra-
violet light (UV EPROM). The M27V201 is in the
programming mode when VPP input is at 12.75V,
E is at VIL and P 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 ad-
dress and data inputs are TTL. VCC is specified to
be 6.25V ±0.25V.
6/15
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