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PT8A2516
Simple Timer
Features
Operating voltage: 3.5V~5.5V.
Have Reset function
Relay output disable without external oscillator
Adjustable Timer: 20mins~16hrs
Quick test mode(QTM)
Few external components
Low cost lead free TO94-4L and SOT23-5L package
Description
The PT8A2516 is a CMOS LSI chip designed for
timer applications, the time can be adjusted by external
R/C. It has reset function.
The chip includes: Power on reset circuit, Logic
control circuit, Output driver circuit, Key scan circuit,
timer circuit, Built-in internal oscillator and external R/C
oscillator circuit etc. It is enclosed in lead free TO-94 and
SOT23-5 package.
Applications
Timer
Pin Configuration
TO94-4L (Top View)
OSC
GND
VCC
1
2
3
PT8A2515
SOT23-5L(Top View)
SOT23-5
5
NC
4 Relay
Pin Description
Pin No.
TO94-4L
1
2
3
4
-
SOT23-5L
4
3
1
2
5
Pin Name
Relay
VCC
OSC
GND
NC
I/O
O
I
I/O
I
-
Description
Relay output, high active
Power supply
Oscillator's Frequency of 8.192KHz with an external R1, C1.
As input, requires a negative pulse to active “Reset” function.
Ground
Not connected
2014-04-0002
1
PT0273-4
04/09/2014
PT8A2516
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Simple Timer
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Simple Timer
Maximum Ratings
Storage Temperature…………………………………………..-40
o
C to +125
o
C
Supply Voltage to Ground Potential (Inputs & V
CC
only)……- 0.5 to V
CC
+0.5V
Supply Voltage to Ground Potential (Outputs & D/O only) …- 0.5 to V
CC
+0.5V
DC Input Voltage …………………………………………- 0.5V to V
CC
+0.5V
DC Output Current ……………………………………………………… 20mA
Power Dissipation……………………………………………………… 500mW
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operation Conditions
Sym
V
CC
V
IH
V
IL
T
A
Description
Supply voltage.
“H” Input Voltage
“L” Input Voltage
Operation temperature
Min
3.5
0.8 V
CC
-
-40
Typ
5.0
-
-
25
Max
5.5
-
0.35 V
CC
85
Unit
V
V
V
C
DC Electrical Characteristics
(Unless otherwise noted, V
CC
= 5V, T
A
= -40 ~ 85º
C)
Symbol
I
OH
I
OL
OSC
I
CC
Parameter
Output Source Current (Relay)
Output Sink Current(Relay)
Frequency of normal oscillator
Power supply current
Test Condition
V
OH
=4.5V
V
OL
=0.5V
R1=47KΩ C1=332, see
Fig 1
V
CC
=5V, R1=47 KΩ,
C1=332, all output
floating. See Fig 1
Min
-10
10
7808
-
Typ
-
-
8192
-
Max
-
100
8576
500
Unit
mA
uA
Hz
A
IC
RELAY
VCC
OSC/RESET
OSC
GND
PT8A2 515/6NE
1
2
3
4
C1
332
R1
47K
C URRENT
METER
POWER
SUPPLY
Fig1 Test circuit
2014-04-0002
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PT0273-4
04/09/2014
PT8A2516
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Simple Timer
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Simple Timer
Block Diagram
OSC
OSC/RESET
Oscillator
Timer
Power On
Reset
VCC
Key
scan
Logic control
Circuit
GND
System
Oscillator
Output
Driver
RELAY
Function Description
(Refer to Block Diagram)
The chip mainly includes: Power on reset circuit, Logic
control circuit, Output driver circuit, Key scan circuit, timer
circuit, external R/C oscillator circuit and internal oscillator
circuit etc.
Power on reset circuit
Internal power on reset circuit will reset all the logic circuit
and the timer; it will clear all output pins when power on.
Logic control circuit
The logic circuit will carries out all the logic control function.
It will check OSC pin status, then control the output drive
circuit, when timer is out, it will pull down Relay pin to
release relay.
Output driver circuit
The pin Relay will drive a relay.
Key scan circuit
This circuit will detect “Reset/Restart” key at OSC have a low
negative pulse, it will active the corresponding work status.
When IC worked normal, it will reset the timer; when timer is
out, it will reset the timer and restart the output.
Timer circuit
This circuit will provide a timer to logic control circuit. When
Fosc = 8.192 KHz, timer output is 29486400/8192=1hrs.
External R/C Oscillator circuit
This will produce a system frequency depend on external
resistor and cap, the frequency is about 8.192 KHz when
R1=47 KΩ and C1=332. (Refer
to Fig 1).
Note:
The system frequency with external resistor and cap
must be between 200Hz to 20 KHz.
Internal oscillator
An on-chip RC oscillator with frequency about 256 KHz is
used to check the input signal and the wrong statue of
external RC oscillator.
QTM
In order to make the manufacturer’s test convenient, quick
test mode is designed to speed up the test.
QTM can be accessed by pressing button (reset) over 3s once
power on. It can exit automatically after quick test timer is
expired; system comes back normal operation after quick test
mode.
Timer
1hr
16hr
QTM timer
2s
32s
2014-04-0002
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PT8A2516
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Simple Timer
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Simple Timer
VRL
VCC
Typical Application Circuit
R2
10K/0.25W
C1
D1
1N400 7
D2
1N400 7
RELAY
DC24V
D5
1N400 7
474 /25 0VAC
R3
2K
ZD2
5.1V
C3
22u F/1 0V
L
RELAY KEY
R1
1M/0 .2 5W
C2
47u F/3 5V
ZD1
24V
R5
4.7K
Q1
R4
1K
OUT
VCC
OSC
D3
1N400 7
D4
1N400 7
GND
2N390 4
LED
R6
250 K*
OUT
120VAC 60Hz
N
1
2
3
4
SW1
Res et
C4
332
R7
47K*
PT8A2516NE
PT8A2516
2014-04-0002
4
PT0273-4
04/09/2014
PT8A2516
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Simple Timer
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Simple Timer
Mechanical Information
SOT23-5L
Top Mark Instruction of SOT23-5L package
: Assembly site code
sG: PT8A2516TAE
XX: Date code
2014-04-0002
5
PT0273-4
04/09/2014
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