msm62x42b Oki Semiconductor, msm62x42b Datasheet - Page 21

• Manufacturer Part Number: msm62x42b
• Description: Real Time Clock Ic With Built-in Crystal
• Manufacturer: Oki Semiconductor

¡ Semiconductor
CS
V
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
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 V
2. In moving to the stand-by mode, 1/5 V
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
IH
1
in the stand-by mode.
5V operation.
be disabled. In the stand-by mode, approx. 0V should be applied.
value (2V) of the operating power supply voltage and the interface with the IC external is not
guaranteed while the clock time works.
and V
(Chip Select)
IL
To Standby Mode
of CS
1
V
CS
DD
have 3 functions:
DD
The CS
generate "H" or WR during
this duration.
1
should be applied to this IC for the interface with a microcomputer in
0
of this IC does not
As a matter of fact, regard this matter as the
data holding in the stand-by of STATIC RAM.
2
5
V
DD
4V
2µs (MIN)
DD
Less than
should be applied so that all data buses should
4~6V
2~4V
1
5
V
DD
The interface with this IC
is available after this.
From Standby Mode
4V
4
5
2µs (MIN)
V
DD
MSM62X42B
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