M48T128VPM datasheet(7/22 Pages) STMICROELECTRONICS

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M48T128Y, M48T128V*

READ Mode

The M48T128Y/V is in the READ Mode whenever

W (WRITE Enable) is high and E (Chip Enable) is

low. The unique address specified by the 17 Ad-

dress Inputs defines which one of the 131,072

bytes of data is to be accessed.

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

within tAVQV (Address Access Time) after the last

address input signal is stable, providing the E and

G access times are also satisfied. If the E and G

access times are not met, valid data will be avail-

able after the latter of the Chip Enable Access

Times (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 Ad-

dress Inputs are changed while E and G remain

active, output data will remain valid for tAXQX (Out-

put Data Hold Time) but will go indeterminate until

the next Address Access.

Figure 5. READ Mode AC Waveforms

Note: WE = High.

Table 3. READ Mode AC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).

2. CL = 5pF.

Symbol

Parameter(1)

M48T128Y

M48T128V

Unit

–70

–85

Min

Max

Min

Max

tAVAV

READ Cycle Time

tAVQV

Address Valid to Output Valid

tELQV

Chip Enable Low to Output Valid

tGLQV

Output Enable Low to Output Valid

tELQX

(2)

Chip Enable Low to Output Transition

tGLQX

(2)

Output Enable Low to Output Transition

tEHQZ

(2)

Chip Enable High to Output Hi-Z

tGHQZ

(2)

Output Enable High to Output Hi-Z

tAXQX

Address Transition to Output Transition

AI01197

tAVAV

tAVQV

tAXQX

tELQV

tELQX

tEHQZ

tGLQV

tGLQX

tGHQZ

DATA OUT

A0-A16

DQ0-DQ7

VALID

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