M27C256B-60N3 Ver la hoja de datos (PDF) - STMicroelectronics
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M27C256B-60N3 Datasheet PDF : 16 Pages
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M27C256B
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
ILI
Input Leakage Current
VIL ≤ VIN ≤ VIH
ICC
Supply Current
IPP
Program Current
E = VIL
VIL
Input Low Voltage
–0.3
VIH
Input High Voltage
2
VOL
Output Low Voltage
IOL = 2.1mA
VOH
Output High Voltage TTL
IOH = –1mA
3.6
VID
A9 Voltage
11.5
Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Max
±10
50
50
0.8
VCC + 0.5
0.4
12.5
Unit
µA
mA
mA
V
V
V
V
V
Table 10. Programming Mode AC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V
Symbol
Alt
Parameter
Test Condition
Min
tAVEL
tAS Address Valid to Chip Enable Low
2
tQVEL
tDS Input Valid to Chip Enable Low
2
tVPHEL
tVPS VPP High to Chip Enable Low
2
tVCHEL
tVCS VCC High to Chip Enable Low
2
tELEH
tPW Chip Enable Program Pulse Width
95
tEHQX
tDH Chip Enable High to Input Transition
2
tQXGL
tOES Input Transition to Output Enable Low
2
tGLQV
tOE Output Enable Low to Output Valid
tGHQZ
tDFP Output Enable High to Output Hi-Z
0
tGHAX
tAH Output Enable High to Address Transition
0
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
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27C256B are in the "1"
state. Data is introduced by selectively program-
ming "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 ultraviolet
light (UV EPROM). The M27C256B is in the pro-
gramming mode when VPP input is at 12.75V, G is
at VIH and E is pulsed to VIL. The data to be pro-
grammed 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 ± 0.25 V.
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