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INTEGRATED CIRCUITS
NE/SA/SE555/SE555C Timer
Product data Supersedes data of 1994 Aug 31 2003 Feb 14
Philips Semiconductors
Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
DESCRIPTION
The 555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA.
PIN CONFIGURATION
D and N Packages
GND 1 TRIGGER 2 OUTPUT 3 RESET 4 8 7 6 5 VCC DISCHARGE THRESHOLD CONTROL VOLTAGE
SL00349
FEATURES
* Turn-off time less than 2 s * Max. operating frequency greater than 500 kHz * Timing from microseconds to hours * Operates in both astable and monostable modes * High output current * Adjustable duty cycle * TTL compatible * Temperature stability of 0.005% per C
APPLICATIONS
Figure 1. Pin configuration
BLOCK DIAGRAM
VCC 8
R 5 THRESHOLD 6
COMPARATOR
CONTROL VOLTAGE
R 2
* Precision timing * Pulse generation * Sequential timing * Time delay generation * Pulse width modulation
COMPARATOR R
TRIGGER
7 DISCHARGE FLIP FLOP 4 RESET
OUTPUT STAGE
3 OUTPUT
1 GND
SL00350
Figure 2. Block Diagram
ORDERING INFORMATION
DESCRIPTION 8-Pin Plastic Small Outline (SO) Package 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Small Outline (SO) Package 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) TEMPERATURE RANGE 0 to +70 C 0 to +70 C -40 C to +85 C -40 C to +85 C -55 C to +125 C -55 C to +125 C ORDER CODE NE555D NE555N SA555D SA555N SE555CN SE555N DWG # SOT96-1 SOT97-1 SOT96-1 SOT97-1 SOT97-1 SOT97-1
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
EQUIVALENT SCHEMATIC
FM CONTROL VOLTAGE VCC R1 4.7 k R2 330 R3 4.7 k R4 1 k R7 5 k R12 6.8 k Q21 Q5 Q6 Q7 Q8 Q9 Q22 Q19 R13 3.9 k
THRESHOLD
Q1 Q2 Q3
Q4
R10 82 k Q23 C B R8 5 k Q11 Q12 CB Q18 E
R11 4.7 k
OUTPUT
R5 10 k TRIGGER RESET DISCHARGE Q14 GND Q25 R6 100 k R16 100 Q10
Q20 R14 220 Q24 R15 4.7 k
Q13 Q16 Q15 R9 5 k
Q17
NOTE:
Pin numbers are for 8-Pin package
SL00351
Figure 3. Equivalent schematic
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC PD Supply voltage SE555 NE555, SE555C, SA555 Maximum allowable power dissipation1 Operating ambient temperature range NE555 SA555 SE555, SE555C Storage temperature range Lead soldering temperature (10 sec max) PARAMETER RATING +18 +16 600 0 to +70 -40 to +85 -55 to +125 -65 to +150 +230 UNIT V V mW C C C C C
Tamb
Tstg TSOLD
NOTE: 1. The junction temperature must be kept below 125 C for the D package and below 150C for the N package. At ambient temperatures above 25 C, where this limit would be derated by the following factors: D package 160 C/W N package 100 C/W
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
DC AND AC ELECTRICAL CHARACTERISTICS
Tamb = 25 C, VCC = +5 V to +15 V unless otherwise specified. SYMBOL VCC ICC PARAMETER Supply voltage Su ly Supply current (low state)1 Timing error (monostable) Initial accuracy2 Drift with temperature Drift with supply voltage Timing error (astable) Initial accuracy2 Drift with temperature Drift with supply voltage Control voltage level Threshold voltage Threshold current3 Trigger voltage Trigger current Reset voltage4 Reset current Reset current VCC = 15 V VCC = 5 V VTRIG = 0 V VCC = 15 V, VTH = 10.5 V VRESET = 0.4 V VRESET = 0 V VCC = 15 V ISINK = 10 mA ISINK = 50 mA ISINK = 100 mA ISINK = 200 mA VCC = 5 V ISINK = 8 mA ISINK = 5 mA VCC = 15 V ISOURCE = 200 mA ISOURCE = 100 mA VCC = 5 V ISOURCE = 100 mA tOFF tR tF Turn-off time5 Rise time of output Fall time of output Discharge leakage current VRESET = VCC 0.3 0.1 0.4 0.1 0.4 2.0 2.5 0.1 0.05 12.5 13.3 3.3 0.5 100 100 20 2.0 200 200 100 4.8 1.45 VCC = 5 V, RL = VCC = 15 V, RL = RA = 2 k to 100 k C=0.1 F TEST CONDITIONS SE555 Min 4.5 3 10 0.5 30 0.05 4 0.15 VCC = 15 V VCC = 5 V VCC = 15 V VCC = 5 V 9.6 2.9 9.4 2.7 10.0 3.33 10.0 3.33 0.1 5.0 1.67 0.5 Typ Max 18 5 12 2.0 100 0.2 6 500 0.6 10.4 3.8 10.6 4.0 0.25 5.2 1.9 0.9 1.0 0.4 1.0 0.15 0.5 2.2 0.3 0.1 0.4 0.1 0.4 2.0 2.5 0.3 0.25 12.5 13.3 3.3 0.5 100 100 20 2.0 300 300 100 4.5 1.1 9.0 2.6 8.8 2.4 NE555/SA555/SE555C Min 4.5 3 10 1.0 50 0.1 5 0.3 10.0 3.33 10.0 3.33 0.1 5.0 1.67 0.5 Typ Max 16 6 15 3.0 150 0.5 13 500 1 11.0 4.0 11.2 4.2 0.25 5.6 2.2 2.0 1.0 0.4 1.5 0.25 0.75 2.5 UNIT V mA mA % ppm/C %/V % ppm/C %/V V V V V A V V A V mA mA V V V V V V V V V s ns ns nA
tM tM/T tM/VS tA tA/T tA/VS VC VTH ITH VTRIG ITRIG VRESET IRESET
RA, RB = 1 k to 100 k C = 0.1 F VCC = 15 V
VO OL
LOW level output voltage LOW-level
0.25 0.2
0.4 0.35
VOH
HIGH-level output voltage g
13.0 3.0
12.75 2.75
NOTES: 1. Supply current when output high typically 1 mA less. 2. Tested at VCC = 5 V and VCC = 15 V. 3. This will determine the max value of RA+RB, for 15 V operation, the max total R = 10 M, and for 5 V operation, the max. total R = 3.4 M. 4. Specified with trigger input HIGH. 5. Time measured from a positive-going input pulse from 0 to 0.8xVCC into the threshold to the drop from HIGH to LOW of the output. Trigger is tied to threshold.
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Pulse Width Required for Triggering
150 MINIMUM PULSE WIDTH (ns) SUPPLY CURRENT - mA 125 100 75 +25 C 50 25 0 0 0.1 0.2 0.3 0.4 (xVCC) +70 C +125 C -55 C 0 C 10.0 8.0 +125 C +25 C 6.0 -55 C 4.0
Supply Current vs Supply Voltage
1.015 1.010 1.005 1.000 0.995
Delay Time vs Temperature
2.0 0 5.0 10.0 SUPPLY VOLTAGE - VOLTS 15.0
NORMALIZED DELAY TIME
0.990 0.985 -50 -25 0 +25 +50 +75 +100 +125
LOWEST VOLTAGE LEVEL OF TRIGGER PULSE
TEMPERATURE - C
Low Output Voltage vs Output Sink Current
10 VCC = 5 V 1.0 V OUT - VOLTS V OUT - VOLTS 1.0 -55 C +25 C 0.1 +25 C 10
Low Output Voltage vs Output Sink Current
10 VCC = 10 V -55 C V OUT - VOLTS +25 C +25 C 0.1 +25 C -55 C +25 C 1.0
Low Output Voltage vs Output Sink Current
VCC = 15 V
-55 C
0.1 +25 C
+25 C -55 C
0.001 1.0 2.0 5.0 10 20 50 100
0.01 1.0 2.0 5.0 10 20 50 100
0.01 1.0 2.0 5.0 10 20 50 100
ISINK - mA
ISINK - mA
ISINK - mA
High Output Voltage Drop vs Output Source Current
2.0 1.8 1.6 V CC V OUT - VOLTS 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1.0 2.0 5.0 10 20 50 100 5 V VCC 15 V +125 C -55 C +25 C NORMALIZED DELAY TIME 1.015 1.010 1.005 1.000 0.995 0.990 0.985 0
Delay Time vs Supply Voltage
300 250
Propagation Delay vs Voltage Level of Trigger Pulse
PROPAGATION DELAY - ns
-55 C 200 150 100 50 0 C
+25 C +70 C +25 C
0 5 10 15 20 0 0.1 0.2 0.3 0.4
ISOURCE - mA
SUPPLY VOLTAGE - V
LOWEST VOLTAGE LEVEL OF TRIGGER PULSE - xVCC
SL00352
Figure 4. Typical Performance Characteristics
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
TYPICAL APPLICATIONS
VCC
RA 7 RB CONTROL VOLTAGE 0.01 F THRESHOLD 5 6
8
555 OR 1/2 556
DISCHARGE
R
COMP
R
FLIP FLOP
3 OUTPUT OUTPUT
2 TRIGGER
COMP
R
C 4 RESET
f+
1.49 (R A ) 2R B)C
Astable Operation
VCC
RA 7
8
555 OR 1/2 556
DISCHARGE
R CONTROL VOLTAGE 0.01 F THRESHOLD C R FLIP FLOP OUTPUT OUTPUT 5 6 COMP | t |
3
2 TRIGGER
COMP
1 *V 3 CC
R
4 RESET
T = 1.1RC
Monostable Operation Figure 5. Typical Applications
SL00353
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
TYPICAL APPLICATIONS
VCC VCC VCC
10 k 0.001 F 2 555 0VOLTS 1/3 VCC
1 DURATION OF TRIGGER PULSE AS SEEN BY THE TIMER
SWITCH GROUNDED AT THIS POINT
SL00354
Figure 6. AC Coupling of the Trigger Pulse
Trigger Pulse Width Requirements and Time Delays
Due to the nature of the trigger circuitry, the timer will trigger on the negative going edge of the input pulse. For the device to time out properly, it is necessary that the trigger voltage level be returned to some voltage greater than one third of the supply before the time out period. This can be achieved by making either the trigger pulse sufficiently short or by AC coupling into the trigger. By AC coupling the trigger, see Figure 6, a short negative going pulse is achieved when the trigger signal goes to ground. AC coupling is most frequently used in conjunction with a switch or a signal that goes to ground which initiates the timing cycle. Should the trigger be held low, without AC coupling, for a longer duration than the timing cycle the output will remain in a high state for the duration of the low trigger signal, without regard to the threshold comparator state. This is due to the predominance of Q15 on the base of Q16, controlling the state of the bi-stable flip-flop. When the trigger signal then returns to a high level, the output will fall immediately. Thus, the output signal will follow the trigger signal in this case.
Another consideration is the "turn-off time". This is the measurement of the amount of time required after the threshold reaches 2/3 VCC to turn the output low. To explain further, Q1 at the threshold input turns on after reaching 2/3 VCC, which then turns on Q5, which turns on Q6. Current from Q6 turns on Q16 which turns Q17 off. This allows current from Q19 to turn on Q20 and Q24 to given an output low. These steps cause the 2 s max. delay as stated in the data sheet. Also, a delay comparable to the turn-off time is the trigger release time. When the trigger is low, Q10 is on and turns on Q11 which turns on Q15. Q15 turns off Q16 and allows Q17 to turn on. This turns off current to Q20 and Q24, which results in output high. When the trigger is released, Q10 and Q11 shut off, Q15 turns off, Q16 turns on and the circuit then follows the same path and time delay explained as "turn off time". This trigger release time is very important in designing the trigger pulse width so as not to interfere with the output signal as explained previously.
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
DIP8: plastic dual in-line package; 8 leads (300 mil)
SOT97-1
2003 Feb 14
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
REVISION HISTORY
Rev _2 Date 20030214 Description Product data (9397 750 11129); ECN 853-0036 29156 of 06 November 2002. Supersedes Product specification dated August 31, 1994.
* Remove all cerdip information from the data sheet. Package type discontinued. * `Absolute maximum ratings' table: TSOLD rating changed from `+300 C' to `+230 C'.
19940831 Product specification; ECN 853-0036 13721 of 31 August 1994. (Filename = NE_SA555X.pdf)
Modifications:
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Philips Semiconductors
Product data
Timer
NE/SA/SE555/SE555C
Data sheet status
Level
I
Data sheet status [1]
Objective data
Product status [2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data
Qualification
III
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 02-03
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 11129
Philips Semiconductors
2003 Feb 14 11

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