Silan

Semiconductors SC8560
DIGITAL ALARM CLOCK

DESCRIPTION
The SC8560 is an alarm equipped digital clock IC with built-in
drivers capable of directly driving LED display equipment. SOP-28

FEATURES
* Single chip P-channel ED MOS LSI
* LED direct drive using time division (duplex configuration)
* Wide operating power supply voltage range
* Built-in alarm function with 24-hour control
* Supports changeover between 12-hour AM/PM and 24-hour SDIP-28
displays
* Built-in battery backup CR oscillator
* Built-in automatic fast forward function for hour and minute
settings ORDERING INFORMATION
* Built-in snooze function supporting repeat use Part No. Package
* Uses 50Hz as standard frequency SC8560 SDIP-28-400-1.778
* Built-in sleep timer function (maximum intervals for 59 minutes or SC8560S SOP-28-375-1.27
1 hour and 59 minutes)
* Equipped with power failure display function APPLICATIONS
* 900Hz output for alarm tone * Alarm clocks
* Clock-radios

PIN CONFIGURATIONS
AM & 10'S HR ag & de 1 28 12/24 HR SELECT

PM & 10'S HR b 2 27 CR INPUT

10'S HR c & HR c 3 26 50/60Hz SELECT

HR b & g 4 25 50/60Hz INPUT

HR c & d 5 24 SNOOZE INPUT

HR a & f 6 23 SLEEP INPUT

10'S MIN a & f 7 22 HOUR SET

SC8560
10'S MIN b & g 8 21 MIN SET

10'S MIN c & d 9 20 VDD

10'S MIN e & MIN e 10 19 ALARM DISP

MIN b & g 11 18 ALARM OFF

MIN c & d 12 17 SLEEP OUT

MIN a & f 13 16 ALARM OUT

COLON OUT 14 15 VSS

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
1
 50/60Hz 12/24HR
Select Select
26 28
Silan
CR 1 AM & 10'S HR ag & de
27 OSC CTR 1Hz 50/60Hz
Input
GATE 1/25 or 1/30 1/2
BLOCK DIAGRAM
50/60Hz 25 Tone T Disp &
S. Sample PF. Blank & 2 PM & 10'S HR b
Input 50/60Hz 2Hz DET Flash
Stand by DET
3 10'S HR c& HR c
SEC CTR GATE
Minute
Semiconductors

21 S. Sample 4 HR b&g
Set
Input
Control Sec
Hour F. Sample Time MIN. CTR Time HR. CTR 5 HR c&d
22
Set
2Hz
Time & S. Sample Time & F. Sample 6 HR a&f
Reset Sec RSTYHLD Time
Control T. RST Comparator

2
AL. RST

PWR UP
7 10'S MIN a&f
PWR UP
Alarm 8 10'S MIN b&g
19 SEC Disp Alarm MIN CTR Alarm HR. CTR Alarm
Display T. Disp
AL. Disp
Output Decoder/Driver

Time & F. Sample Alarm & F. Sample 9 10'S MIN c&d

Control
Display
Sleep SL. Disp
23
Display
Sleep CTR Sleep
10 10'S MIN e& Min e
PWR
UP
11 Min b&g

display
Second
Control

Snooze Output 12 Min c&d

24
Input Control
13 Min a&f

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

20 15 14 18 16 17
Colon Alarm Alarm Sleep
VDD VSS

Rev: 1.1
Output OFF Output Output
SC8560

2003.06.26
 Silan
Semiconductors SC8560
ABSOLUTE MAXIMUM RATINGS(Ta =25°C, Vss =0V)
Characteristic Symbol Condition Value Unit
Maximum Supply Voltage VDD max. -15.0 ~ + 0.3 V
Input Voltage 1 VIN(1) 50/60Hz input -15.0 ~ + 0.3 V
Input Voltage 2 (except pin 26) VIN(2) Except 50/60Hz input -15.0 ~ + 0.3 V
Output Voltage VOUT -15.0 ~ + 0.3 V
Input Clamp current( pin 26) IIN 50/60Hz input -0.4 ~ +0.4 mA
Allowable Power Dissipation PD Ta=70°C 700 mW
Operating Temperature Topr -30 ~ +70 °C
Storage Temperature Tstg -55 +125 °C

ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=-12.0V, VSS=0V,Unless otherwise specified)

Parameter Symbol Test conditions Min Typ Max Unit
Supply Voltage VDD -14.0 -7.5 V
Input “H” level Voltage VIH(1) 50/60Hz Input -1.0 V
Input “L” level Voltage VIL(1) 50/60Hz Input VDD+2 V
Input “H” level Voltage VIH(2) Except 50/60Hz input -1.5 V
Input “L” level Voltage VIL(2) Except 50/60Hz input VDD+2 V
50/60 Hz input pin input voltage VAC-IN VLED V
Input “H” level current(1) IIH1 50/60Hz Input, VIN=VSS 10 μA
Input “L” level current(1) IIL1 50/60Hz Input, VIN=VDD 10 μA
Input “H” level current(2) Input pins other than 50/60Hz 20 μA
IIH2
Input,VIN=VSS
Input “L” level current(2) Input pins other than 50/60Hz 10 μA
IIL2
Input,VIN=VDD
Output “H” level current(1) Alarm output and sleep output, 5 mA
IOH1
VOH=VSS-1V
Output leakage current(1) Alarm output and sleep output, 10 μA
IOF1
VOUT=VDD
Output “H” level current(2) AM& 10’S HR ag&de (24H 36 mA
IOH2
mode),VOUT=VDD-1V
Output leakage current(2) AM& 10’S HR ag&de (24H 20 μA
IOF2
mode),VOUT=VDD
Output “H” level current(3) Segment Output other than 18 mA
IOH3 those listed above , VOUT=Vss-
1V

(To be continued)

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
3
 Silan
Semiconductors SC8560
(Continued)
Parameter Symbol Test conditions Min Typ Max Unit
Output leakage current(3) Segment Output other than 20 μA
IOF3
those listed above, VOUT=VDD
Power failure detection voltage VDF -7.5 -5.0 V
Consumption current Output set to off and pull-down 5 7 mA
ICC
attached input set to open
Backup oscillator stability factor Standard value,900Hz, -10 10 %
fs
VDD= -9V 10%
Backup oscillator accuracy Standard value,900Hz, -10 10 %
fa
VDD= -9V

DESCRIPTION OF OPERATIONS
Terminal Description Operating Description
Built-in Shumidt circuit enable noise elimination at 50/60Hz commercial
50/60 Hz Input:
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
CR Input 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.
When 50/60 selective input is connected to Vss,50Hz use is enable. When 50/60
50/60Hz Selective Input selective input is left open, VDD is activated using an internal pull-down resistor
and the setting is switched to enable use at 60Hz.
Since the pull-down resistor is built-in, selection from four display modes is
Display Mode Selective Input
possible using two SPST switches (single-pole and single-throw switches). Table l
(Alarm Select/Sleep Select )
shows these display mode selections.
There are two setting inputs for use with “hour” and “minute”. Time content
Time Setting Input settings shown in Table 2 are possible by activating Vss to these pins. A pull-down
resister is built-in.
Leaving this pin unconnected (VDD) causes the 12-hour basis to be selected,
12/24H Select Input 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
Semiconductors SC8560
(Continued)
Terminal Description Operating Description
If the power supply voltage drops and is applied again, all the on-segments flash
Power Failure Detection display and the power failure indication mode is entered. The power failure indication
mode is released by applying VSS to “hour set” or “ minutes set”.
The alarm signal outputs when alarm content marches the time .When not reset
by either snooze input or alarm off input, output continues after l hour and 59
Alarm Operation and Alarm
minutes. This output signal consists of 900 Hz 2 Hz intermittent (50% duty)
Output
modulation signals. When the need arises, a filter can be applied to alter the alarm
signal to a DC signal.
When the alarm is sounding and instantly activating Vss to this pin, alarm output is
set to OFF for a period between 8 and 9 minutes after which time the alarm signal
is once again output .The snooze function can be used repeatedly in l hour and 59
Snooze Input
minutes intervals. A pull-down resist is built-in. Activating Vss to the snooze pin
when the alarm is OFF resets the sleep timer counter to [0:00].(This is known as
the one-touch sleep timer reset function.)
Activating this input pin to Vss instantly sets alarm output to OFF. A pull-down
Alarm Off Input
resistor is built-in.
Sleep output can turn on the radio and can be set for time intervals of 59 minutes
or l hour and 59 minutes. Refer to Table 2 for the proper selection procedure (59
minutes or l hour and 59 minute selection). This sleep timer is constructed using a
Sleep Timer and Sleep Output:
down counter and when the counter content arrives at [00], output is set to off and
the radio turns off .Adding Vss to snooze input turns sleep output off, when sleep
output is on.

TABLE 1: DISPLAY MODES

Selective
Input Display Mode Digit No.1 Digit No.2 Digit No.3 Digit No.4
Alarm Sleep
10’s place for 10’s place for
NC NC Time display Hour Minute
hour ,AM/PM minute
10’s place for 10’s place for
Vss NC Alarm display Hour Minute
hour ,AM/PM minute
10’s place for
NC Vss Sleep display Hour Minute
Clear minute
10’s place for
Vss Vss Second display Clear Minute Second
second
Note: Activating Vss using two inputs simultaneously (alarm select and sleep select), the display mode is switched
to display seconds.

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
5
 Silan
Semiconductors SC8560
TABLE 2: SETTING CONTENTS
Display Mode Set lnput Functions
lmmediately adds 1 to hour digits and then assigns an additional 1. at a speed
HOUR
of 2 Hz , after each 1/4 to 3/4 second .
lmmediately adds 1 to minute digits and then assigns an additional 1. at a
Time
MIN speed of 2 Hz, after each 1/4 to 3/4 second .
Seconds are reset.
BOTH Operates both as outline above.
HOUR(Note) Second digits are cleared to [00].
Second MIN Time holds.
(Alarm&Sleep) Resets hour and minute digits as [0:00] when operating in 24-Hmode or [12:00]
BOTH
when operating in 12-H mode.
lmmediately adds 1to hour digits and then assigns an additional 1, at a speed
HOUR
of 2 Hz, after each 1/4to 3/4 second.
lmmediately adds 1 to minute digits and then assigns an additional 1, at a
Alarm MIN
speed of 2 Hz, after each 1/4to 3/4 second.
Resets hour and minute digits to [0:00] when operating in 24-hour mode or
BOTH
[12:00] when operating in, 12-hour mode.
- Sets sleep counter to [0:59] instantly when VDD is activated to sleep select.
Sets sleep counter to [1:59] instantly when VDD is activated to sleep select and
HOUR
Sleep hour at the same time.
MIN Sleep counter looses 1 at a speed of 2 Hz
BOTH Sleep counter looses 1 at a speed of 2 Hz
Once conditions have been switched to reset or hold, input of other functions is locked until HOUR and MIN
input have separated.

Note:
When the digital reading for seconds is between 30 and 59 seconds, 1 is added to digits for minutes as the
digital reading for seconds resets to [00]

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
6
 C1=0.015μF
27kȍ
f=900Hz
R1=110kȍ
Silan
4.7kȍ 27kȍ
0.001μF
2.2kȍ

12HR 60Hz

2.2kȍ
4.7kȍ
NC NC

0.47μF
28 27 26 25 24 23 22 21 20 19 18 17 16 15
Semiconductors

12/24 CR 50/60Hz 50/60Hz Snooze Sleep HOUR MIN Alarm Alarm Sleep Alarm
Backup HR Input Select Input Input Input V DD Vss
Set Set Disp Off Out Out
Battery Select
100kȍ
SC8560
AM & PM & 10'S 10'S 10'S 10'S 10'S
HR HR HR MIN MIN MIN Colon
10'S HR 10'S HR c & MIN MIN MIN MIN e &
b&g c&d a&f b&g c&d a&f Out
ag & de HR b HR c a&f b&g c & d MIN e

7
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Duplex LED
a
f b
AC NOTE: 1
g
e c
Cycle 1
d
Cathode
Common 2
Cycle 2
This circuit is used as noise interference
stripper for the LW band.( Backup control
CLOCK-RADIO APPLICATION CIRCUIT (Positive Power Supply)

is enabled except for battery backup mode

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1
12 Hour Display and 60Hz Circuit Diagram
SC8560

2003.06.26
 Piezo Buzzer
Silan

C1
R1
110kȍ

0.015μF
330μF
f=900Hz

12HR 60Hz
NC NC
Semiconductors

0.001μF
28 27 26 25 24 23 22 21 20 19 18 17 16 15
12/24 CR 50/60Hz 50/60Hz Snooze Sleep HOUR MIN Alarm Alarm Sleep Alarm
HR Input Select Input Input Input V DD Vss
Set Set Disp Off Out Out
Select

100kȍ
SC8560
AM & PM & 10'S 10'S 10'S 10'S 10'S
HR HR HR MIN MIN MIN Colon
10'S HR 10'S HR c & MIN MIN MIN MIN e &
b&g c&d a&f b&g c&d a&f Out

8
ag & de HR b HR c a&f b&g c & d MIN e

1 2 3 4 5 6 7 8 9 10 11 12 13 14

f b
AC NOTE: 1 g
e c
Cycle 1
d
Cathode Common
CLOCK APPLICATION CIRCUIT (Negative Power Supply)

2
When Battery backup or tone output is not
Cycle 2 used, CR input is connected to Vss.

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1
12 Hours Display and 60Hz Circuit diagram
SC8560

2003.06.26
 Silan
Semiconductors SC8560
PACKAGE OUTLINE
SDIP-28-400-1.778 UNIT:mm

SOP-28-375-1.27 UNIT:mm

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
9
 Silan
Semiconductors SC8560
Attachment

Revision History

Data REV Description Page

2000.12.31 1.0 Original
Add ”SOP-28-375-1.27” 1, 9
2003.06.26 1.1 Add” ORDERING INFORMATION” 1
DEL”FUNCTIONS” 1

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.1 2003.06.26
10