LC79451KB

No.A2223-8/38

5-4. AC Timing Characteristics (I

(Case without the special mention VDD = +2.5V, VSS = 0V, Ta = +25°C)

Parameter

Symbol

Condition

min

typ

max

Unit

Note

VDD - VDD2 setup time

tSU(1)

0

-

-

μs

VDD2 - RESET setup time

tSU(2)

10

-

-

ms

RESET pulse width

tPW(1)

5

-

-

μs

RESET - START condition

RESET - CS setup time

tSU(3)

1

-

-

μs

RESET - VHON setup time

RESET - START setup time

tSU(4)

10

-

-

ms

Automatic charge-pump

mode

Typ

× 0.97

(*1)

(Typ

× 1.03)+1

ms

*2

HVON Flag hold time

tHD(1)

Manual charge-pump

mode

Option

LE Flag hold time

tHD(2)

-

-

1

μs

*2

Note: *1. It is same as rising period of the charge-pump. (Period be set by control register 1)

*2. The Flag is canceled automatically.

1) Timing of main signals from power-up to the initialize operation

Fig.2. VDD, VDD2, RESET, SDA(I

tSU(2)

VDD

tPW(1)

RESET

(90%)

VDD2

(90%)

tSU(3)

CS

(SPI)

SDA

(I

tSU(4)

tSU(1)

HVON Flag

or

START Flag