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M27W256-150K6TR bảng dữ liệu(PDF) 7 Page - STMicroelectronics

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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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M27W256
Table 9. Programming Mode DC Characteristics (1)
(TA =25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
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
Note: VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
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
Symbol
Alt
Parameter
Min
Max
Unit
tAVEL
tAS
Address Valid to Chip Enable Low
2
µs
tQVEL
tDS
Input Valid to Chip Enable Low
2
µs
tVPHEL
tVPS
VPP High to Chip Enable Low
2
µs
tVCHEL
tVCS
VCC High to Chip Enable Low
2
µs
tELEH
tPW
Chip Enable Program Pulse Width
95
105
µs
tEHQX
tDH
Chip Enable High to Input Transition
2
µs
tQXGL
tOES
Input Transition to Output Enable Low
2
µs
tGLQV
tOE
Output Enable Low to Output Valid
100
ns
tGHQZ
tDFP
Output Enable High to Output Hi-Z
0
130
ns
tGHAX
tAH
Output Enable High to Address Transition
0
ns
Programming
The M27W256 has been designed to be fully com-
patible with the M27C256B and has the same
electronic signature. As a result the M27W256 can
be programmed as the M27C256B on the same
programming equipments 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 M27W256
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 M27W256 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
address and data inputs are TTL. VCC is specified
to be 6.25 V
± 0.25 V.


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