Symbol

Parameter

M48Z58 / M48Z58Y

Unit

-70

Min

Max

Write Cycle Time

70

ns

Address Valid to Write Enable Low

0

ns

Address Valid to Chip Enable Low

0

ns

Write Enable Pulse Width

50

ns

Chip Enable Low to Chip Enable High

55

ns

Write Enable High to Address Transition

0

ns

Chip Enable High to Address Transition

0

ns

Input Valid to Write Enable High

30

ns

Input Valid to Chip Enable High

30

ns

Write Enable High to Input Transition

5

ns

Chip Enable High to Input Transition

5

ns

(1, 2)

Write Enable Low to Output Hi-Z

25

ns

Address Valid to Write Enable High

60

ns

Address Valid to Chip Enable High

60

ns

(1, 2)

Write Enable High to Output Transition

5

ns

2. If E goes low simultaneously with W going low, the outputs remain in the high impedance state.

Table 10. Write Mode AC Characteristics

READ MODE

The M48Z58/58Y is in the Read Mode whenever

W (Write Enable) is high, E (Chip Enable) is low.

Thus, the unique address specified by the 13 Ad-

dress Inputs defines which one of the 8,192 bytes

of data is to be accessed. Valid data will be avail-

able at the Data I/O pins within Address Access

stable, providing that the E and G access times are

also satisfied. If the E and G access times are not

met, valid data will be available after the latter of

The state of the eight three-state Data I/O signals

is controlled by E and G. If the outputs are activated

puts are changed while E and G remain active,

output data will remain valid for Output Data Hold

Address Access.

WRITE MODE

The M48Z58/58Y 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

Enable prior to the initiation of another read or write

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

7/17

M48Z58, M48Z58Y