M27V256-100B1TR 查看數據表（PDF） - STMicroelectronics
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M27V256-100B1TR Datasheet PDF : 15 Pages
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M27V256
Table 9. Programming Mode DC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
Symbol
Parameter
Test Condition
Min
Max
Unit
ILI
Input Leakage Current
VIL ≤ VIN ≤ VIH
±10
µA
ICC
Supply Current
50
mA
IPP
Program Current
E = VIL
50
mA
VIL
Input Low Voltage
–0.3
0.8
V
VIH
Input High Voltage
2
VCC + 0.5
V
VOL
Output Low Voltage
IOL = 2.1mA
0.4
V
VOH
Output High Voltage TTL
IOH = –1mA
3.6
V
VID
A9 Voltage
11.5
12.5
V
Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Table 10. Programming Mode AC Characteristics (1)
) (TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V
t(s Symbol
Alt
Parameter
Test Condition
Min
uc tAVEL
tAS Address Valid to Chip Enable Low
2
rod tQVEL
tDS Input Valid to Chip Enable Low
2
P tVPHEL
tVPS VPP High to Chip Enable Low
2
te tVCHEL
tVCS VCC High to Chip Enable Low
2
le tELEH
tPW Chip Enable Program Pulse Width
95
so tEHQX
tDH Chip Enable High to Input Transition
2
b tQXGL
tOES Input Transition to Output Enable Low
2
- O tGLQV
tOE Output Enable Low to Output Valid
t(s) tGHQZ
tDFP Output Enable High to Output Hi-Z
0
uc tGHAX
tAH
Output Enable High to Address
Transition
0
d Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Max Unit
µs
µs
µs
µs
105
µs
µs
µs
100
ns
130
ns
ns
Pro Programming
te The M27V256 has been designed to be fully com-
le patible with the M27C256B and has the same
electronic signature. As a result the M27V256 can
so be programmed as the M27C256B on the same
bprogramming equipments applying 12.75V on VPP
and 6.25V on VCC by the use of the same PRES-
OTO II algorithm. When delivered (and after each
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 M27V256 is in the
programming mode when VPP input is at 12.75V,
G is at VIH 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 ad-
erasure for UV EPROM), all bits of the M27V256 dress and data inputs are TTL. VCC is specified to
are in the ’1’ state. Data is introduced by selective- be 6.25 V ± 0.25 V.
ly programming ’0’s into the desired bit locations.
7/15
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