M27W401 Datasheet, PDF (7/15 Pages) STMicroelectronics – 4 Mbit 512Kb x 8 Low Voltage UV EPROM and OTP EPROM

M27W401
Table 9. Programming Mode DC Characteristics ⁽¹⁾
(T_A = 25 °C; V_CC = 6.25V ± 0.25V; V_PP = 12.75V ± 0.25V)
Symbol
Parameter
Test Condition
Min
Max
I_LI
Input Leakage Current
0V ≤ V_IN ≤ V_CC
±10
I_CC
Supply Current
I_PP
Program Current
50
E = V_IL
50
V_IL
Input Low Voltage
V_IH
Input High Voltage
–0.3
2
0.8
V_CC + 0.5
V_OL
Output Low Voltage
V_OH
Output High Voltage TTL
I_OL = 2.1mA
0.4
I_OH = –400µA
2.4
V_ID
A9 Voltage
11.5
Note: 1. V_CC must be applied simultaneously with or before V_PP and removed simultaneously or after V_PP.
12.5
Unit
µA
mA
mA
V
V
V
V
V
Table 10. Programming Mode AC Characteristics ⁽¹⁾
(T_A = 25 °C; V_CC = 6.25V ± 0.25V; V_PP = 12.75V ± 0.25V)
Symbol
Alt
Parameter
Test Condition
Min
t_AVEL
t_AS Address Valid to Chip Enable Low
2
t_QVEL
t_DS Input Valid to Chip Enable Low
2
t_VPHEL
t_VPS V_PP High to Chip Enable Low
2
t_VCHEL
t_VCS V_CC High to Chip Enable Low
2
t_ELEH
t_PW Chip Enable Program Pulse Width
95
t_EHQX
t_DH Chip Enable High to Input Transition
2
t_QXGL
t_OES Input Transition to Output Enable Low
2
t_GLQV
t_OE Output Enable Low to Output Valid
t_GHQZ
t_DFP Output Enable High to Output Hi-Z
0
t_GHAX
t_AH
Output Enable High to Address
Transition
0
Note: 1. V_CC must be applied simultaneously with or before V_PP and removed simultaneously or after V_PP.
2. Sampled only, not 100% tested.
Max Unit
µs
µs
µs
µs
105
µs
µs
µs
100
ns
130
ns
ns
Programming
The M27W401 has been designed to be fully com-
patible with the M27C4001 and has the same elec-
tronic signature. As a result the M27W401 can be
programmed as the M27C4001 on the same pro-
gramming equipment applying 12.75V on V_PP and
6.25V on V_CC by the use of the same PRESTO II
algorithm.
When delivered (and after each ‘1’s erasure for UV
EPROM), all bits of the M27W401 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 exposure to ultraviolet
light (UV EPROM). The M27W401 is in the pro-
gramming mode when V_PP input is at 12.75V, G is
at V_IH and E is pulsed to V_IL. The data to be pro-
grammed is applied to 8 bits in parallel to the data
output pins. The levels required for the address
and data inputs are TTL. V_CC is specified to be
6.25V ± 0.25V
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