M48Z09 datasheet(5/13 Pages) STMICROELECTRONICS

5 / 13 page

Symbol

Parameter

Min

Max

Unit

tPD

E1 or W at VIH or E2 at VIL before Power Down

µs

(1)

VPFD (max) to VPFD (min) VCC Fall Time

300

µs

tFB

(2)

VPFD (min) to VSO VCC Fall Time

µs

VPFD(min) to VPFD (max) VCC Rise Time

µs

tRB

VSO to VPFD (min) VCC Rise Time

µs

tREC

E1 or W at VIH or E2 at VIL after Power Up

tPFX

INT Low to Auto Deselect

µs

tPFH

(3)

VPFD (max) to INT High

120

µs

Notes:1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200

µs after

VCC passes VPFD (min).

2. VPFD (min) to VSO fall time of less than tFB may cause corruption of RAM data.

3. INT may go high anytime after VCC exceeds VPFD (min) and is guaranteed to go high tPFH after VCC exceeds VPFD (max).

Table 7. Power Down/Up Mode AC Characteristics (TA = 0 to 70

°C)

AI00566

VCC

INPUTS

INT

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tPFX

tPFH

tREC

tPD

tRB

tDR

VALID

NOTE

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

Figure 5. Power Down/Up Mode AC Waveforms

Note: Inputs may or may not be recognized at this time. Caution should be taken to keep E1 high or E2 low as VCC rises past VPFD(min).

Some systems may performs inadvertent write cycles after VCC rises above VPFD(min) but before normal system operations begins. Even

though a power on reset is being applied to the processor a reset condition may not occur until after the system clock is running.

5/13

M48Z09, M48Z19

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