M48T08 datasheet(7/27 Pages) STMICROELECTRONICS

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M48T08, M48T08Y, M48T18

READ Mode

The M48T08/18/08Y is in the READ Mode when-

ever W (WRITE Enable) is high, E1 (Chip Enable

1) is low, and E2 (Chip Enable 2) is high. The de-

vice architecture allows ripple-through access 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 E1, E2, and G

access times are also satisfied. If the E1, E2 and

G access times are not met, valid data will be

available after the latter of the Chip Enable Access

times (tE1LQV or tE2HQV) or Output Enable Access

time (tGLQV).

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

is controlled by E1, E2 and G. If the outputs are ac-

tivated before tAVQV, the data lines will be driven to

an indeterminate state until tAVQV. If the address

inputs are changed while E1, E2 and G remain ac-

tive, output data will remain valid for Output Data

Hold time (tAXQX) but will go indeterminate until the

next address access.

Figure 7. READ Mode AC Waveforms

Note: WRITE Enable (W) = High.

AI00962

tAVAV

tAVQV

tAXQX

tE1LQV

tE1LQX

tE1HQZ

tGLQV

tGLQX

tGHQZ

VALID

A0-A12

DQ0-DQ7

tE2HQV

tE2HQX

VALID

tE2LQZ

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