M27V322(2000) Ver la hoja de datos (PDF) - STMicroelectronics
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M27V322 Datasheet PDF : 13 Pages
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Table 10. MARGIN MODE AC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12V ± 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
tA10HEH
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.
Table 11. Programming Mode AC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12V ± 0.25V)
Symbol
Alt
Parameter
Test Condition Min
tAVEL
tAS Address Valid to Chip Enable Low
1
tQVEL
tDS Input Valid to Chip Enable Low
1
tVCHEL
tVCS VCC High to Chip Enable Low
2
tVPHEL
tOES VPP High to Chip Enable Low
1
tVPLVPH
tPRT VPP Rise Time
50
tELEH
tPW Chip Enable Program Pulse Width (Initial)
45
tEHQX
tDH Chip Enable High to Input Transition
2
tEHVPX
tOEH Chip Enable High to VPP Transition
2
tVPLEL
tVR VPP Low to Chip Enable Low
1
tELQV
tDV Chip Enable Low to Output Valid
tEHQZ (2)
tDFP Chip Enable High to Output Hi-Z
0
tEHAX
tAH Chip Enable High to Address Transition
0
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
M27V322
Max
Unit
µs
µs
µs
µs
µs
µs
µs
Max Unit
µs
µs
µs
µs
ns
55
µs
µs
µs
µs
1
µs
130
ns
ns
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27V322 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 exposition to ultravi-
olet light (UV EPROM). The M27V322 is in the
programming mode when VPP input is at 12.V,
GVPP is at VIH and E is pulsed to VIL. The data to
be programmed is applied to 16 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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