Silan
Semiconductors
SC8560
(Continued)
Pa ra me te r
Symbol
IOF3
Te st c onditions
Min
Typ
Ma x
Unit
Output leakage current(3)
Segment Output other than
those listed above, VOUT=VDD
20
μA
Power failure detection voltage
Consumption current
VDF
-7.5
-5.0
5
V
Output set to off and pull-down
attached input set to open
Standard value,900Hz,
7
mA
ICC
Backup oscillator stability factor
Backup oscillator accuracy
-10
-10
10
10
%
%
fs
fa
V
DD= -9V 10%
Standard value,900Hz,
DD= -9V
V
DESCRIPTION OF OPERATIONS
Te rmina l De sc ription
Ope ra ting De sc ription
Built-in Shumidt circuit enable noise elimination at 50/60Hz commercial
frequencies with use of a simple CR filter. Built-in pull-up resistor.
When the AC power supply is interrupted, the time counter switches to a holding
state and a built-in oscillator promptly begins operation. If 50/60Hz input
continuous for 3 clocks without arriving, this oscillator’s output is activated and
functions as the time counter clock in place of 50/60Hz input. The frequency level
of this clock oscillator is determined according to the CK Value. While the above
mentioned oscillator is operating using backup mode, all segment output is
switched to OFF. (Note) When the backup oscillator is in use due to an AC power
supply interruption, the 50/60Hz input pin must be maintained open or at a Vss
level.
50/60 Hz Input:
CR Input
When 50/60 selective input is connected to Vss,50Hz use is enable. When 50/60
selective input is left open, VDD is activated using an internal pull-down resistor
and the setting is switched to enable use at 60Hz.
50/60Hz Selective Input
Since the pull-down resistor is built-in, selection from four display modes is
possible using two SPST switches (single-pole and single-throw switches). Table l
shows these display mode selections.
Display Mode Selective Input
(Alarm Select/Sleep Select )
There are two setting inputs for use with “hour” and “minute”. Time content
settings shown in Table 2 are possible by activating Vss to these pins. A pull-down
resister is built-in.
Time Setting Input
12/24H Select Input
Leaving this pin unconnected (VDD) causes the 12-hour basis to be selected,
connecting this pin to VSS cause the 24-hour basis to be selected .An internal pull-
down resistor is provided.
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.1
2003.06.26
4
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
