Datasheet

735
22.11.5 Auto-Erase Mode
1. Auto-erase mode supports only entire memory erasing.
2. Do not perform a command write during auto-erasing..
3. Confirm normal end of auto-erasing by checking I/O6. Alternatively, status read mode can also
be used for this purpose (I/O7 status output uses the auto-erase operation end identification
pin).
4. Status polling I/O6 and I/O7 pin information is retained until the next command write. As long
as the next command write has not been performed, reading is possible by enabling CE and
OE.
Table 22.17 AC Characteristics in Auto-Erase Mode (Conditions: V
CC
= 5.0 V ±10%,
V
SS
= 0 V, T
a
= 25°C ±5°C)
Item Symbol Min Max Unit Notes
Command write cycle t
nxtc
20 µs
CE hold time t
ceh
0ns
CE setup time t
ces
0ns
Data hold time t
dh
50 ns
Data setup time t
ds
50 ns
Write pulse width t
wep
70 ns
Status polling start time t
ests
1ms
Status polling access time t
spa
150 ns
Memory erase time t
erase
100 40000 ms
Erase setup time t
ens
100 ns
Erase end setup time t
enh
100 ns
WE rise time t
r
30 ns
WE fall time t
f
30 ns