M48Z08 datasheet(7/18 Pages) STMICROELECTRONICS

7 / 18 page

Symbol

Parameter

M48Z08 / M48Z18

Unit

-100

Min

Max

tAVAV

Write Cycle Time

100

tAVWL

Address Valid to Write Enable Low

tAVEL

Address Valid to Chip Enable Low

tWLWH

Write Enable Pulse Width

tELEH

Chip Enable Low to Chip Enable High

tWHAX

Write Enable High to Address Transition

tEHAX

Chip Enable High to Address Transition

tDVWH

Input Valid to Write Enable High

tDVEH

Input Valid to Chip Enable High

tWHDX

Write Enable High to Input Transition

tE1HDX

Chip Enable High to Input Transition

tWLQZ

(1, 2)

Write Enable Low to Output Hi-Z

tAVWH

Address Valid to Write Enable High

tAVEH

Address Valid to Chip Enable High

tWHQX

(1, 2)

Write Enable High to Output Transition

Notes: 1. CL = 30pF (see Figure 4).

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

Table 10. Write Mode AC Characteristics

(TA = 0 to 70

°C; VCC = 4.75V to 5.5V or 4.5V to 5.5V)

READ MODE

The M48Z08/18 is in the Read Mode whenever W

(Write Enable) is high and E (Chip Enable) is low.

The device architecture allows ripple-through ac-

cess of data from eight of 65,536 locations in the

static storage array. Thus, the unique address

specified by the 13 Address Inputs defines which

one of the 8,192 bytes of data is to be accessed.

Valid data will be available at the Data I/O pins

within Address Access time (tAVQV) after the last

address input signal is 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 Chip Enable Access

time (tELQV) or Output Enable Access time (tGLQV).

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

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

before tAVQV, the data lines will be driven to an

indeterminate state until tAVQV. If the Address In-

puts are changed while E and G remain active,

output data will remain valid for Output Data Hold

time (tAXQX) but will go indeterminate until the next

Address Access.

WRITE MODE

The M48Z08/18 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 tEHAX from Chip Enable or tWHAX from Write

Enable prior to the initiation of another read or write

cycle. Data-in must be valid tDVWH prior to the end

of write and remain valid for tWHDX 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 tWLQZ after W falls.

7/18

M48Z08, M48Z18

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