Datasheet

M48Z58, M48Z58Y Operating modes
Doc ID 2559 Rev 11 9/24
Figure 5. READ mode AC waveforms
Note: WRITE enable (W
) = High.
Table 3. READ mode AC characteristics
2.2 WRITE mode
The M48Z58/Y is in the WRITE mode whenever W and E are low. 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; V
CC
= 4.75 to 5.5 V or 4.5 to 5.5 V (except where noted).
M48Z58/Y
Unit
Min Max
t
AVAV
READ cycle time 70 ns
t
AVQV
Address valid to output valid 70 ns
t
ELQV
Chip enable low to output valid 70 ns
t
GLQV
Output enable low to output valid 35 ns
t
ELQX
(2)
2. C
L
= 5 pF (see Figure 9 on page 14).
Chip enable low to output transition 5 ns
t
GLQX
(2)
Output enable low to output transition 5 ns
t
EHQZ
(2)
Chip enable high to output Hi-Z 25 ns
t
GHQZ
(2)
Output enable high to output Hi-Z 25 ns
t
AXQX
Address transition to output transition 10 ns
AI01385
tAVAV
tAVQV tAXQX
tELQV
tELQX
tEHQZ
tGLQV
tGLQX
tGHQZ
VALID
A0-A12
E
G
DQ0-DQ7
VALID