M27V405 View Datasheet(PDF) - STMicroelectronics
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M27V405 Datasheet PDF : 13 Pages
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M27V405
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
ILI
Input Leakage Current
0 ≤ VIN ≤ VCC
±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 = –400µA
2.4
VID
A9 Voltage
11.5
12.5
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
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: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
Max Unit
µs
µs
µs
µs
105
µs
µs
µs
100
ns
130
ns
ns
Programming
The M27V405 has been designed to be fully com-
patible with the M27C405 and has the same elec-
tronic signature. As a result the M27V405 can be
programmed as the M27C405 on the same pro-
gramming equipments applying 12.75V on VPP
and 6.25V on VCC by the use of the same PRES-
TO II algorithm. When delivered, all bits of the
M27V405 are in the ’1’ state.Data is introduced by
selectively programming ’0’s into the desired bit lo-
cations. Although only ’0’s will be programmed,
both ’1’s and ’0’s can be present in the data word.
The M27V405 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 6.25V±0.25V, but it can be
set to lower values in case of On-Board Program-
ming (see dedicated paragraph).
7/13
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