M27W800 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M27W800 Datasheet PDF : 15 Pages
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M27W800
Table 9. Programming Mode DC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.5V ± 0.25V)
Symbol
Parameter
Test Condition
Min
Max
ILI
Input Leakage Current
0 ≤ VIN ≤ VCC
±1
ICC
Supply Current
50
IPP
Program Current
E = VIL
50
VIL
Input Low Voltage
–0.3
0.8
VIH
Input High Voltage
2.4
VCC + 0.5
VOL
Output Low Voltage
IOL = 2.1mA
0.4
VOH Output High Voltage TTL
IOH = –2.5mA
3.5
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 = 12.5V ± 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
tVPHAV
tVPS VPP High to Address Valid
2
tVCHAV
tVCS VCC High to Address Valid
2
tELEH
tPW Chip Enable Program Pulse Width
45
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 (2)
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
55
µs
µs
µs
120
ns
130
ns
ns
Programming
The M27W800 has been designed to be fully com-
patible with the M27C800 and has the same elec-
tronic signature. As a result the M27W800 can be
programmed as the M27C800 on the same pro-
gramming equipments applying 12.75V on VPP
and 6.25V on VCC by the use of the same PRES-
TO III algorithm. When delivered (and after each
erasure for UV EPROM), all bits of the M27W800
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 M27W800 is in
the programming mode when VPP input is at
12.5V, G 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.
8/15
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