Simple Timer. PT8A2515 Datasheet

PT8A2515 Timer. Datasheet pdf. Equivalent

PT8A2515 Datasheet
Recommendation PT8A2515 Datasheet
Part PT8A2515
Description Simple Timer
Feature PT8A2515; PT8A2515 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||.
Manufacture Pericom
Datasheet
Download PT8A2515 Datasheet




Pericom PT8A2515
PT8A2515
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Simple Timer
Features
Operating voltage: 3.5V~5.5V
Have Reset function
Relay output disable without external oscillator
Adjustable Timer: 30s~20mins
Few external components
Low cost TO-94 and SOT23-5 package
Applications
Toaster Controller
Timer
Description
The PT8A2515 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.
Block Diagram
OSCO/RSECSET Oscillator
Time r
Power On VCC
Re s et
Key Logic control
scan Circuit
GND
S ys te m
Oscillator
Output
Drive r
RELAY
2013-07-0010
PT0272-3 08/01/13
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Pericom PT8A2515
PT8A2515
Simple Timer
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Pin Configuration
OSC 1
GND 2
VCC 3
PT8A2515
SOT23-5
5 NC
4 Relay
Pin Description
Pin No.
TO-94 SOT23-5
14
23
31
42
-5
Pin Name
Relay
VCC
OSC
GND
NC
I/O Description
O Relay output, high active
I Power supply
I/O
Oscillator's Frequency of 8.192KHz with an external R1, C1.
As input, requires a negative pulse to active Resetfunction.
I Ground
- Not connected
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/Restartkey at OSC have a low
negative pulse, it will active the corresponding work status.
When IC worked at timer, 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 245720/8192=30s.
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 180Hz 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.
2013-07-0010
PT0272-3 08/01/13
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Pericom PT8A2515
PT8A2515
Simple Timer
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Maximum Ratings
Storage Temperature…………………………………………..- 40oC to +125oC
Supply Voltage to Ground Potential (Inputs & VCC only)……- 0.5 to VCC+0.5V
Supply Voltage to Ground Potential (Outputs & D/O only) - 0.5 to VCC+0.5V
DC Input Voltage …………………………………………- 0.5V to VCC +0.5V
DC Output Current ……………………………………………………… 20mA
Power Dissipation……………………………………………………… 500mW
Recommended Operation Conditions
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.
Sym
VCC
VIH
VIL
TA
Description
Supply voltage.
HInput Voltage
LInput Voltage
Operation temperature
Min
3.5
0.8 VCC
-
0
Typ Max Unit
5.0 5.5
V
- -V
- 0.35 VCC V
25 85 C
DC Electrical Characteristics
(Unless otherwise noted, VCC= 5V, TA = 0 ~ 85ºC)
Symbol
Parameter
IOH Output Source Current (Relay)
IOL Output Sink Current(Relay)
FOSC Frequency of normal oscillator
ICC Power supply current
Test Condition
VOH=4.5V
VOL=0.5V
R1=47KΩ C1=332, see
Fig 1
VCC=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/ ROESSCET
GND
PT8A2 515/6NE
1
2
3
4
C URRENT
R1 METER
47K
C1
332 PO W ER
S UPPLY
Fig1 Test circuit
2013-07-0010
PT0272-3 08/01/13
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