M48Z12 datasheet(8/20 Pages) STMICROELECTRONICS

8 / 20 page

Operation modes

M48Z02, M48Z12

8/20

Figure 4.

Read mode AC waveforms

Note:

WRITE Enable (W) = High.

Table 3.

Read mode AC characteristics

2.2

Write mode

The M48Z02/12 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.

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where

noted).

M48Z02/M48Z12

Unit

–70

–150

–200

Min

Max

Min

Max

Min

Max

tAVAV

READ cycle time

150

200

tAVQV

Address valid to output valid

150

200

tELQV

Chip enable low to output valid

150

200

tGLQV

Output enable low to output valid

tELQX

Chip enable low to output transition

tGLQX

Output enable low to output transition

tEHQZ

Chip enable high to output Hi-Z

tGHQZ

Output enable high to output Hi-Z

tAXQX

Address transition to output transition

AI01330

tAVAV

tAVQV

tAXQX

tELQV

tELQX

tEHQZ

tGLQV

tGLQX

tGHQZ

VALID

A0-A10

DQ0-DQ7

VALID

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