Precision Timer. 555 Datasheet

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555 Datasheet
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Part 555
Description Precision Timer
Feature 555; NEW PRODUCT NE555/SA555/NA555 PRECISION TIMERS Description These devices are precision timing circ.
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Datasheet
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Diodes 555
NE555/SA555/NA555
PRECISION TIMERS
Description
These devices are precision timing circuits capable of
producing accurate time delays or oscillation. In the time-
delay or monostable mode of operation, the timed interval is
controlled by a single external resistor and capacitor network.
In the astable mode of operation, the frequency and duty
cycle can be controlled independently with two external
resistors and a single external capacitor.
The threshold and trigger levels normally are two-thirds and
one-third, respectively, of VCC. These levels can be altered
by use of the control-voltage terminal. When the trigger input
falls below the trigger level, the flip-flop is set, and the output
goes high. If the trigger input is above the trigger level and
the threshold input is above the threshold level, the flip-flop is
reset and the output is low. The reset (RESET) input can
override all other inputs and can be used to initiate a new
timing cycle. When RESET goes low, the flip-flop is reset,
and the output goes low. When the output is low, a low-
impedance path is provided between discharge (DISCH) and
ground.
The output circuit is capable of sinking or sourcing current up
to 200mA. Operation is specified for supplies of 5V to 15V.
With a 5-V supply, output levels are compatible with TTL
inputs.
Pin Assignments
(Top View)
GND
TRIG
OUT
RESET
SO-8
Features
Timing from microseconds to hours
Astable or monostable operation
Adjustable duty cycle
TTL compatible output can source or sink up to 200mA
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
VCC
DISCH
THRES
CONT
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
1 of 14
www.diodes.com
February 2012
© Diodes Incorporated



Diodes 555
NE555/SA555/NA555
PRECISION TIMERS
Pin Descriptions
Pin Name
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
VCC
Pin Number
1
2
3
4
5
6
7
8
Description
Ground
Trigger set 1/3VCC
Timer output
Reset active low
External adjustment of internal threshold and trigger voltages
Threshold set to 2/3 VCC
Low impedance discharge path
Chip supply voltage
Functional Block Diagram
RESET can override TRIG, which can override THRESH
Functional Table
Pin Name
GND
TRIG
OUT
RESET
Nominal Trigger
Voltage
Irrelevant
<1/3VCC
<1/3VCC
<1/3VCC
Threshold
Voltage
Irrelevant
Irrelevant
<2/3VCC
<2/3VCC
Output
Discharge
Switch
Low On
High
Off
Low On
As previously established
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
2 of 14
www.diodes.com
February 2012
© Diodes Incorporated



Diodes 555
NE555/SA555/NA555
PRECISION TIMERS
Absolute Maximum Ratings (Note 2) @ TA = 25°C unless otherwise stated
Symbol
VCC
VI
IO
θJA
θJC
TJ
TSTG
Parameter
Supply voltage (Note 3)
Input voltage
CONT, RESET, THRES, TRIG
Output current
Package thermal resistance Junction-to-Ambient (Note 4)
Package thermal resistance Junction-to-Case (Note 5)
Junction temperature
Storage temperature
Rating
18
VCC
±225
130
15
150
-65 to 150
Unit
V
V
mA
°C/W
°C/W
°C
°C
Recommended Operating Conditions (TA = 25°C)
Symbol
VCC
VI
IO
TA
Parameter
Supply voltage
Input voltage
CONT, RESET, THRES, TRIG
Output current
NE555
Operating Ambient Temperature SA555
NA555
Min Max Unit
4.5 16 V
VCC
V
±200
mA
0 70
-40 85 °C
-40 105
Notes:
2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only.
Functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
3. All voltage values are with respect ground.
4. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature
is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
5. Maximum power dissipation is a function of TJ(max), θJC, and TA. The maximum allowable power dissipation at any allowable ambient temperature
is PD = (TJ(max) – TC)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
Electrical Characteristics (VCC = 5V to 15V, TA = 25°C unless otherwise stated)
Symbol
Parameter
VTH
ITH
VTR
ITR
VRST
IRST
IDIS
VDIS
Threshold voltage level
Threshold current (Note 6)
Trigger voltage level
Trigger current
RESET voltage level
RESET current
DISCH switch off-state current
DISCH saturation voltage with
output low (Note 7)
VCON
CONT voltage (open circuit)
Test conditions
VCC = 15V
VCC = 5V
VCC = 15V
VCC = 5V
TRIG at 0V
RESET at VCC
RESET at 0V
VCC = 15V, IDIS = 15mA
VCC = 5V, IDIS = 4.5mA
VCC = 15V
VCC = 5V
Min Typ. Max Unit
8.8 10 11.2
2.4 3.3 4.2
V
30 250 nA
4.5 5 5.6
1.1 1.67 2.2
V
0.5 2 µA
0.3 0.7
1
V
0.1 0.4
-0.4 -1.5
mA
20 100 nA
180 480
mV
80 200
9 10 11
2.6 3.3
4
V
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
3 of 14
www.diodes.com
February 2012
© Diodes Incorporated







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