M48Z58 datasheet(9/23 Pages) STMICROELECTRONICS

9 / 23 page

M48Z58, M48Z58Y

Operating modes

9/23

Figure 5.

Read mode AC waveforms

Note:

WRITE Enable (W) = High.

Table 3.

Read mode AC characteristics

2.2

Write mode

The M48Z58/Y 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 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; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

M48Z58/Y

Unit

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)

CL = 5pF (see Figure 9 on page 14).

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

AI01385

tAVAV

tAVQV

tAXQX

tELQV

tELQX

tEHQZ

tGLQV

tGLQX

tGHQZ

VALID

A0-A12

DQ0-DQ7

VALID

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