ETC AN6780/AN6780S

AN6780, AN6780S
General Purpose Long Interval Timers
■ Overview
AN6780
Unit : mm
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.
2.4±0.25
3.5±0.25
2.54
7
6
5
18.2±0.3
• High inflow and outflow current : IO=±15mA max
• Small variation of oscillations
• Long interval timer setting : max 1 week
4
0.5±0.1
1.5±0.25
■ Features
3
2
1
+ 0.1
0.3 – 0.05
■ Applications
1.5±0.25
6.0±0.3
3.0±0.3
Timers, integrating timers, superlow frequency oscillators
7-pin SIL Plastic Package (SIP007-P-0000)
14
13
12
11
10
9
8
0.3
4.2±0.3
0.15
0.65
0.1±0.1
10.1±0.3
1
2
3
4
5
6
7
1.5±0.2
1.24
Unit : mm
1.27
0.4±0.25
AN6780S
6.5±0.3
14-pin PANAFLAT Plastic Package (SOP014-P-0225A)
■ Block Diagram
(2)
1
7
Voltage Stabilizer
VCC
(12)
To each block
5
2
(9)
(4)
Oscillator
Input Circuit
F/F
1
F/F
2
F/F
15
Output
Circuit
6
(11)
3
(6)
Input Circuit
4
(8)
The pin numbers in ( ) are for the AN6780S.
GND
■ Absolute Maximum Ratings (Ta=25˚C)
Parameter
Symbol
Rating
VCC
13
Supply voltage
Voltage
Circuit voltage
Current
V
V1–4 (2–8)
0
4
V
V2, 3–4 (4, 6–8)
0
13
V
V5–4 (9–8)
0
4
V
V6–4 (11–8)
VCC *1
Supply current
ICC
30
Circuit current
I6 (11)
Power dissipation
Temperature
Unit
V
mA
–15
15
PD
mA
360
mW
Operating ambient temperature
Topr
–20 to +75
˚C
Storage temperature
Tstg
–55 to +125
˚C
*1 When output is at “H”, the pin number are for the AN6780S
■ Recommended Operating Range (Ta=25˚C)
Parameter
Symbol
Range
VCC
4.5V to 12V
Operating supply voltage range
■ Electrical Characteristics (Ta=25˚C)
Parameter
Symbol
Supply current
ICC
Oscillator charging current
I1 (I2)
Condition
VCC=12V
VCC=5V, R=10kΩ
min
typ
max
Unit
4
6.5
10
mA
0.26
0.3
0.35
mA
Input current high level
IIH
VCC=12V, VIH=12V
10
µA
Input current low level
IIL
VCC=4.5V, VIL=0V
500
µA
Output voltage high level
VOH1
VCC=5V, IOH=–1mA
3
Output voltage high level
VOH2
VCC=9V, IOH=–10mA
5
Output voltage low level
VOL1
VCC=5V, IOL=10mA
0.4
V
Output voltage low level
VOL2
VCC=9V, IOL=10mA
0.4
V
Input voltage high level
VIH
Input voltage low level
VIL
Pin No.
Symbol
1
2
VS
2
4
Stop
Oscillation stop input
3
6
Reset
Reset input
4
8
GND
Ground
5
9
CR
6
11
Output
7
12
VCC
Internal stabilized power supply
C.R. connection
Output
Supply voltage
AN6780S : The Pins1, 3, 5, 7,10, 13 and 14 are non-contact.
V
0.8
Description
AN6780S
V
2
■ Pin Descriptions
AN6780
V
V
■ Application Circuit
1) Superlow frequency oscillator
VCR
AN6780, AN6780S
(2)
1
(4)
2
(6)
3
(8)
4
(9)
5
TO
(11) (12)
6
7
Reset
VCC
RT
+
1 to 10µF
–
RL
CT
Pins numbers in ( )
are for the AN6780S
Stop
T1
T2
Output
VCR
TS = T1 + T2 + 16384TO
TO
Integrating timer interval
TS (s) 11RT (kΩ) · CT (µF) + (T1 + T2 + ···)
Output
T1= 32768TO
Oscillation interval TO (S) 0.69RT (Ω) · CT (F)
Output interval TI (S) 22RT (kΩ) · CT (µF)
2) Timer
AN6780, AN6780S
(2)
1
+
1 to 10µF
–
(4)
2
(6)
3
(8)
4
(9)
5
(11) (12)
6
7
VCC
RT
RL
CT
Pin numbers in ( ) are for the AN6780S
Reset
(Timer control)
VCR
TO
Reset
Output
Tt
=16384TO
Tt
Timer interval Tt (S) 11RT (kΩ) · CT (µF)
3) Integrating timer
AN6780, AN6780S
(2)
1
(4)
2
(6)
3
(8)
4
(9)
5
(11) (12)
6
7
■ 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
tanδ, whose resistance is 1kΩ to 1MΩ and timed capacity
of 0.1µF.
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 10µF) 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
VCC
1 to +
10µF
–
RT
RL
CT
Pin numbers in ( ) are for the AN6780S
Integration input
(11) 6
The pin numbers in ( ) are for the AN6780S
• Truth Table (Positive Logic)
Mode
Reset
L
Stop
*
Oscillator
1
Stop
Clear
Frequency divider
H
Output
2
H
H
Start
Counting
Counting
3
H
L
Stop
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.
■ Characteristics Curve
fOSC – RT
Tt – RT
Ta=25˚C
106
=0
T
103
1µ
.1
µF
F
102
10
µF
10
10
0µ
F
1
10–1
F
0µ
10
105
=
CT
104
µF
10
F
1µ
10min.
µF
.1
1min.
103
2
0
160
12V
120
80
40
10
10–2
1
10
102
1
103
Timed Resistance RT (kΩ)
1
10
102
0
103
VOH – IOH
VCC=12V
8
9V
4
5V
12
16
High Output Current IOH (mA)
20
12
16
20
ICC –VCC
10
Ta=25˚C
VCC=5V
CT=0.1µF
RT=1kΩ
9
Supply Current ICC (mA)
Nomalized Oscillation fOSC (14.5kHz)
12
8
8
fOSC – Ta
Ta=25˚C
4
4
Low Output Current IOL (mA)
1.02
0
0
Timed Resistance RT (kΩ)
16
High Output Voltage VOH (V)
1day
10hrs.
60min.
10
VCC=5V
1week
Output Voltage VOL (mV)
C
0
VOL– IOL
200
Tt
104
Timer Interval Tt (s)
Oscillation Frequency fOSC (Hz)
105
1.01
1.00
0.99
8
7
6
5
4
3
2
1
0.98
–40
0
40
80
120
Ambient Temperature Ta (˚C)
0
0
2
4
6
8
10
12
14
Supply Voltage VCC (V)
16
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2001 MAR