M48Z129Y datasheet(7/16 Pages) STMICROELECTRONICS

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M48Z129Y*, M48Z129V

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 (see Figure 10., page 11).

WRITE Mode

The M48Z129Y/V is in the WRITE Mode whenever

W (WRITE Enable) and E (Chip Enable) are ac-

tive. 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 En-

able 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 after-

ward. 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.

Figure 7. WRITE Enable Controlled, WRITE Mode AC Waveform

Symbol

Parameter(1)

M48Z129Y

M48Z129V

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

AI02382

tAVAV

tWHAX

tDVWH

DATA INPUT

A0-A16

DQ0-DQ7

VALID

tAVWH

tAVEL

tWLWH

tAVWL

tWLQZ

tWHDX

tWHQX

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