MSM62X42B Просмотр технического описания (PDF) - Oki Electric Industry

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MSM62X42B

REAL TIME CLOCK IC WITH BUILT-IN CRYSTAL

Oki Electric Industry 

¡ Semiconductor

MSM62X42B

CS1 (Chip Select)

VIH and VIL of CS1 have 3 functions:

1. To accomplish the interface with a microcomputer in 5V operation.

2. To inhibit the control bus, data bus and address bus and to reduce input gate pass current

in the stand-by mode.

3. To protect internal data when the mode is moved to and from stand-by mode.

To realize the above functions:

1. More than 4/5 VDD should be applied to this IC for the interface with a microcomputer in

5V operation.

2. In moving to the stand-by mode, 1/5 VDD should be applied so that all data buses should

be disabled. In the stand-by mode, approx. 0V should be applied.

3. To and from the stand-by mode, obey the following Timing chart.

] The stand-by mode means the power supply voltages from 4V to 2V up to the minimum

value (2V) of the operating power supply voltage and the interface with the IC external is not

guaranteed while the clock time works.

To Standby Mode

VDD

CS1

4~6V

4V

2~4V

2µs (MIN)

2

5

VDD

Less

than

1

5

VDD

From Standby Mode

4V

2µs (MIN)

4

5

VDD

The CS0 of this IC does not

generate "H" or WR during

this duration.

The interface with this IC

is available after this.

As a matter of fact, regard this matter as the

data holding in the stand-by of STATIC RAM.

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