M48Z2M1Y datasheet(7/17 Pages) STMICROELECTRONICS

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M48Z2M1Y, M48Z2M1V

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 = 100pF or 50pF (see Figure 10., page 11).

3. CL = 5pF (see Figure 10., page 11).

WRITE Mode

The M48Z2M1Y/V is in the WRITE Mode whenev-

er W and E are active. The start of a WRITE is ref-

erenced 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 minimum of tE-

HAX from E or tWHAX from W prior to the initiation

of another READ or WRITE cycle. Data-in must be

valid tDVEH or tDVWH prior to the end of WRITE and

remain valid for tEHDX or 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.

Figure 7. WRITE Enable Controlled, WRITE Mode AC Waveforms

Note: Output Enable (G) = High.

Symbol

Parameter(1)

M48Z2M1Y

M48Z2M1V

Unit

–70

–85

Min

Max

Min

Max

tAVAV

READ Cycle Time

tAVQV

(2)

Address Valid to Output Valid

tAXQX

(2)

Address Transition to Output Transition

tEHQZ

(3)

Chip Enable High to Output Hi-Z

tELQV

(2)

Chip Enable Low to Output Valid

tELQX

(3)

Chip Enable Low to Output Transition

tGHQZ

(3)

Output Enable High to Output Hi-Z

tGLQV

(2)

Output Enable Low to Output Valid

tGLQX

(3)

Output Enable Low to Output Transition

AI02053

tAVAV

tWHAX

tDVWH

DATA INPUT

A0-A20

DQ0-DQ7

VALID

tAVWH

tAVEL

tWLWH

tAVWL

tWLQZ

tWHDX

tWHQX

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