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AN6780, AN6780S
General Purpose Long Interval Timers
s Overview
The AN6780 and AN6780S are ICs designed for general purpose long interval timers. They consists of an oscillator, frequency divider (flip-flop 15steps), output circuit, and power circuit. A cycle can be freely set with the external resistor (RT) and capacity (CT) of the oscillator.
AN6780
2.40.25 6.00.3 7 6 18.20.3 5 4 3 2 1 0.3 - 0.05
+ 0.1
Unit : mm
3.50.25 2.54 0.50.1 1.50.25 3.00.3 1.50.25 Unit : mm VCC GND 1.50.2 10.10.3 7 (12) 6 (11) 4 (8) 14 13 12 11 10 9 8 4.20.3 6.50.3 0.15 0.65
s Features
* High inflow and outflow current : IO=15mA max * Small variation of oscillations * Long interval timer setting : max 1 week
s Applications
Timers, integrating timers, superlow frequency oscillators
7-pin SIL Plastic Package (SIP007-P-0000)
AN6780S
0.40.25
1.24 0.10.1 1.27
1 2 3 4 5 6 7
0.3
14-pin PANAFLAT Plastic Package (SOP014-P-0225A)
s Block Diagram
(2) 1 To each block 5 (9) Oscillator Voltage Stabilizer
2
(4)
Input Circuit
F/F 1
F/F 2
F/F 15
Output Circuit
3
(6)
Input Circuit
The pin numbers in ( ) are for the AN6780S.
s Absolute Maximum Ratings (Ta=25C)
Parameter Supply voltage Voltage Symbol VCC V1-4 (2-8) Circuit voltage V2, 3-4 (4, 6-8) V5-4 (9-8) V6-4 (11-8) Current Power dissipation Temperature Operating ambient temperature Storage temperature Supply current Circuit current ICC I6 (11) PD Topr Tstg -15 360 -20 to +75 -55 to +125 0 0 0 VCC *1 30 15 Rating 13 4 13 4 Unit V V V V V mA mA mW C C
*1 When output is at "H", the pin number are for the AN6780S
s Recommended Operating Range (Ta=25C)
Parameter Operating supply voltage range Symbol VCC Range 4.5V to 12V
s Electrical Characteristics (Ta=25C)
Parameter Supply current Oscillator charging current Input current high level Input current low level Output voltage high level Output voltage high level Output voltage low level Output voltage low level Input voltage high level Input voltage low level Symbol ICC I1 (I2) IIH IIL VOH1 VOH2 VOL1 VOL2 VIH VIL VCC=12V VCC=5V, R=10k VCC=12V, VIH=12V VCC=4.5V, VIL=0V VCC=5V, IOH=-1mA VCC=9V, IOH=-10mA VCC=5V, IOL=10mA VCC=9V, IOL=10mA 2 0.8 3 5 0.4 0.4 Condition min 4 0.26 typ 6.5 0.3 max 10 0.35 10 500 Unit mA mA A A V V V V V V
s Pin Descriptions
Pin No.
AN6780 AN6780S
Symbol 2 4 6 8 9 VS Stop Reset GND CR Output VCC Internal stabilized power supply Oscillation stop input Reset input Ground C.R. connection Output Supply voltage
Description
1 2 3 4 5 6 7
11 12
AN6780S : The Pins1, 3, 5, 7,10, 13 and 14 are non-contact.
s Application Circuit
1) Superlow frequency oscillator AN6780, AN6780S
(2) 1 (4) 2 (6) 3 (8) 4 (9) 5 (11) (12) 6 7 Reset VCC + 1 to 10F - RT CT RL Stop T1 Output VCR TS = T1 + T2 + 16384TO TO Output T1= 32768TO T2 VCR TO
Pins numbers in ( ) are for the AN6780S
Integrating timer interval TS (s) 11RT (k) * CT (F) + (T1 + T2 + ***) Oscillation interval TO (S) 0.69RT () * CT (F) Output interval TI (S) 22RT (k) * CT (F)
s Supplementary Descriptions * Precautions on Use
Obeserve the following in order to prevent destruction and reliability of the IC during its use. 1) For distribution of the oscillation frequency, take about 17% (IC alone) into account at the time of designing. When accuracy is requested, use a variable resistor as a timed resistor to make adjustment. 2) For the timed resistor, use a polyester capacitor with low tan, whose resistance is 1k to 1M and timed capacity of 0.1F. 3) The values obtained from the timer interval calcuation expression, etc. in Application Circuit change depending on accuracy of the timed capacity in the actual set, etc. 4) Attach a capacity (1 to 10F) to the Pin1 (2) in order to protect the IC against noises and stabilize its operation. 5) During normal operation, when you turn on the power after extremely short period of power-off, note that auto reset may not be applied due to residual potential of external capacity. 6) Take a proper countermeasure noises in order to prevent malfunctioning from being caused by external noises. Particularly, when setting a long interval, pay attention to the external noises. 7) When a plunger or relay is connected to the output circuit, connect diodes to both ends of the coil in order to protect the IC against counter electromotive power generated after power-off
2) Timer
AN6780, AN6780S
(2) 1 (4) 2 (6) 3 (8) 4 (9) 5 (11) (12) 6 7
+ 1 to 10F -
RT CT RL
VCC
Pin numbers in ( ) are for the AN6780S Reset (Timer control)
VCR TO Reset
Output Tt =16384TO Tt
Timer interval Tt (S) 11RT (k) * CT (F)
3) Integrating timer
AN6780, AN6780S
(2) 1 (4) 2 (6) 3 (8) 4 (9) 5 (11) (12) 6 7 VCC 1 to + 10F - RL CT
RT
(11) 6
Pin numbers in ( ) are for the AN6780S Integration input
The pin numbers in ( ) are for the AN6780S
* Truth Table (Positive Logic)
Mode 1 2 3 Reset L H H Stop * H L Oscillator Stop Start Stop Frequency divider Clear Counting H Counting Output
Stop Holds the previous state Stop Holds the previous state
Note) *Either L or H will do. When the power is turned on, control proceeds to the mode 2 or mode 3 from the mode 1, depending on the reset/stop input state.
s Characteristics Curve fOSC - RT
105 104
C
Tt - RT
Tt 106 1week 200
VOL- IOL
Ta=25C VCC=5V 160
Oscillation Frequency fOSC (Hz)
Output Voltage VOL (mV)
103 102 10 1 10-1 10-2
Timer Interval Tt (s)
T
=0 F
1
.1 F
105
= CT
F 0 10 F 10
12V
1day 10hrs. 60min.
104 103 10
2
120
10 F 10 0 F
1
F
10min. 1min.
80
0
F .1
40
10 1 0
1
10
102
103
1
10
102
103
0
4
8
12
16
20
Timed Resistance RT (k)
Timed Resistance RT (k)
Low Output Current IOL (mA)
VOH - IOH
16 1.02
fOSC - Ta
10 VCC=5V CT=0.1F RT=1k 1.01
ICC -VCC
Ta=25C 9 8 7 6 5 4 3 2 1
Nomalized Oscillation fOSC (14.5kHz)
Ta=25C
High Output Voltage VOH (V)
12
VCC=12V 8
1.00
9V 4
0.99
5V 0 0 4 8 12 16 20
Supply Current ICC (mA)
0 40 80 120
0.98 -40
0
0
2
4
6
8
10
12
14
16
High Output Current IOH (mA)
Ambient Temperature Ta (C)
Supply Voltage VCC (V)
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2001 MAR

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