Silan

Semiconductors

SC8560

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1

2003.06.26

4

(Continued)

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Output leakage current(3)

Segment Output other than

20

μA

Power failure detection voltage

-7.5

-5.0

V

Consumption current

Output set to off and pull-down

attached input set to open

5

7

mA

Backup oscillator stability factor

fs

Standard value,900Hz,

10%

-10

10

%

Backup oscillator accuracy

fa

Standard value,900Hz,

-10

10

%

DESCRIPTION OF OPERATIONS

Terminal Description

Operating Description

50/60 Hz Input:

Built-in

Shumidt

circuit

enable

noise

elimination

at

50/60Hz commercial

frequencies with use of a simple CR filter. Built-in pull-up resistor.

CR Input

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.

50/60Hz Selective Input

When 50/60 selective input is connected to Vss,50Hz use is enable. When 50/60

and the setting is switched to enable use at 60Hz.

Display Mode Selective Input

(Alarm Select/Sleep Select )

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.

Time Setting Input

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.

12/24H Select Input

down resistor is provided.

(To be continued)