M27W801 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M27W801' PDF : 16 Pages View PDF
M27W801
Table 9. Programming Mode DC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
Symbol
Parameter
Test Conditio n
Min
Max
ILI
Input Leakage Current
VIL ≤ VIN ≤ VIH
±10
ICC
Supply Current
50
IPP
Program Current
E = VIL
50
VIL
Input Low Voltage
–0.3
0.8
VIH
Input High Voltage
2
VCC + 0.5
VOL
Output Low Voltage
IOL = 2.1mA
0.4
VOH Output High Voltage TTL
IOH = –1mA
3.6
VID
A9 Voltage
11.5
12.5
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Table 10. MARGIN MODE AC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
Symbol
Alt
Parameter
Test Condition Min
tA9HVPH
tAS9 VA9 High to VPP High
2
tVPHEL
tVPS VPP High to Chip Enable Low
2
tA10 HEH
tAS10 VA10 High to Chip Enable High (Set)
1
tA10LEH
tAS10 VA10 Low to Chip Enable High (Reset)
1
tEXA10X
tAH10 Chip Enable Transition to VA10 Transition
1
tEXVPX
tVPH Chip Enable Transition to VPP Transition
2
tVPXA9X
tAH9 VPP Transition to VA9 Transition
2
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Max
Unit
µA
mA
mA
V
V
V
V
V
Unit
µs
µs
µs
µs
µs
µs
µs
Programming
The M27W801 has been designed to be fully com-
patible with the M27C801 and has the same elec-
tronic signature. As a result the M27W801 can be
programmed as the M27C801 on the same pro-
gramming equipment applying 12.75V on VPP and
6.25V on VCC by the use of the same PRESTO IIB
algorithm. When delivered (and after each ‘1’s era-
sure for UV EPROM), all bits of the M27W801 are
in the ”1” state. Data is introduced by selectively
programming ”0”s into the desired bit locations.Al-
though only ’0’ will be programmed, both ”1” and
”0” can be present in the data word. The only way
to change a ‘0’ to a ‘1’ is by die exposure to ultra-
violet light (UV EPROM). The M27W801 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.
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