Datasheet

Operation modes M48Z02, M48Z12
8/22 Doc ID 2420 Rev 9
Figure 4. READ mode AC waveforms
Note: WRITE enable (W
) = high.
Table 3. READ mode AC characteristics
2.2 WRITE mode
The M48Z02/12 is in the WRITE mode whenever W and E are active. The start of a WRITE
is referenced from the latter occurring falling edge of W
or E. A WRITE is terminated by the
earlier rising edge of W
or E. The addresses must be held valid throughout the cycle. E or W
must return high for a minimum of t
EHAX
from chip enable or t
WHAX
from WRITE enable prior
to the initiation of another READ or WRITE cycle. Data-in must be valid t
DVWH
prior to the
end of WRITE and remain valid for t
WHDX
afterward. G should be kept high during WRITE
cycles to avoid bus contention; although, if the output bus has been activated by a low on E
and G
, a low on W will disable the outputs t
WLQZ
after W falls.
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 °C or –40 to 85 °C; V
CC
= 4.75 to 5.5 V or 4.5 to 5.5 V (except where
noted).
M48Z02/M48Z12
Unit–70 –150 –200
Min Max Min Max Min Max
t
AVAV
READ cycle time 70 150 200 ns
t
AVQV
Address valid to output valid 70 150 200 ns
t
ELQV
Chip enable low to output valid 70 150 200 ns
t
GLQV
Output enable low to output valid 35 75 80 ns
t
ELQX
Chip enable low to output transition 5 10 10 ns
t
GLQX
Output enable low to output transition 5 5 5 ns
t
EHQZ
Chip enable high to output Hi-Z 25 35 40 ns
t
GHQZ
Output enable high to output Hi-Z 25 35 40 ns
t
AXQX
Address transition to output transition 10 5 5 ns
AI01330
tAVAV
tAVQV tAXQX
tELQV
tELQX
tEHQZ
tGLQV
tGLQX
tGHQZ
VALID
A0-A10
E
G
DQ0-DQ7
VALID