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NE555 Datasheet

Precision Timers

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NA555, NE555, SA555, SE555
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
xx555 Precision Timers
1 Features
1 Timing From Microseconds to Hours
• Astable or Monostable Operation
• Adjustable Duty Cycle
• TTL-Compatible Output Can Sink or Source
Up to 200 mA
• On Products Compliant to MIL-PRF-38535,
All Parameters Are Tested Unless Otherwise
Noted. On All Other Products, Production
Processing Does Not Necessarily Include
Testing of All Parameters.
2 Applications
• Fingerprint Biometrics
• Iris Biometrics
• RFID Reader
3 Description
These devices are precision timing circuits capable of
producing accurate time delays or oscillation. In the
time-delay or mono-stable mode of operation, the
timed interval is controlled by a single external
resistor and capacitor network. In the a-stable 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 200 mA. Operation is specified for
supplies of 5 V to 15 V. With a 5-V supply, output
levels are compatible with TTL inputs.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
PDIP (8)
9.81 mm × 6.35 mm
xx555
SOP (8)
TSSOP (8)
6.20 mm × 5.30 mm
3.00 mm × 4.40 mm
SOIC (8)
4.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
VCC
8 CONT
6
THRES
5 ÎÎÎÎ
2
TRIG
ÎÎÎ
RESET
4
ÎÎÎ R1
R
S
1ÎÎÎ
ÎÎÎ
3
OUT
1
GND
7
DISCH
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

NE555 Datasheet Preview

NE555 Datasheet

Precision Timers

No Preview Available !

NA555, NE555, SA555, SE555
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ..................................... 4
7.2 Handling Ratings....................................................... 4
7.3 Recommended Operating Conditions....................... 4
7.4 Electrical Characteristics........................................... 5
7.5 Operating Characteristics.......................................... 6
7.6 Typical Characteristics .............................................. 7
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 12
9 Applications and Implementation ...................... 13
9.1 Application Information............................................ 13
9.2 Typical Applications ................................................ 13
10 Power Supply Recommendations ..................... 18
11 Device and Documentation Support ................. 19
11.1 Related Links ........................................................ 19
11.2 Trademarks ........................................................... 19
11.3 Electrostatic Discharge Caution ............................ 19
11.4 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
5 Revision History
Changes from Revision H (June 2010) to Revision I
Page
• Updated document to new TI enhanced data sheet format. .................................................................................................. 1
• Deleted Ordering Information table. ...................................................................................................................................... 1
• Added Military Disclaimer to Features list. ............................................................................................................................. 1
• Added Applications. ................................................................................................................................................................ 1
• Added Device Information table. ............................................................................................................................................ 1
• Moved Tstg to Handling Ratings table. .................................................................................................................................... 4
• Added DISCH switch on-state voltage parameter. ................................................................................................................. 5
• Added Device and Documentation Support section............................................................................................................. 19
• Added ESD warning. ............................................................................................................................................................ 19
• Added Mechanical, Packaging, and Orderable Information section..................................................................................... 19
2 Submit Documentation Feedback
Copyright © 1973–2014, Texas Instruments Incorporated
Product Folder Links: NA555 NE555 SA555 SE555


Part Number NE555
Description Precision Timers
Maker etcTI
Total Page 30 Pages
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