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NE556, SA556, SE556 |
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DUAL PRECISION TIMERS |
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SLFS023C ± APRIL 1978 ± REVISED DECEMBER 1999 |
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D Two Precision Timing Circuits per Package |
NE556, SA556 . . . D, OR N PACKAGE |
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D Astable or Monostable Operation |
SE556 . . . J PACKAGE |
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(TOP VIEW) |
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D TTL-Compatible Output Can Sink or Source |
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Up to 150 mA |
1DISCH |
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1 |
14 |
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VCC |
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1THRES |
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D Active Pullup or Pulldown |
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2DISCH |
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1CONT |
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2THRES |
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D Designed to be Interchangeable With |
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12 |
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1RESET |
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2CONT |
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Signetics NE556, SA556, and SE556 |
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1OUT |
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2RESET |
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D Applications Include: |
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1TRIG |
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2OUT |
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± Precision Timers From Microseconds to |
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GND |
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7 |
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2TRIG |
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Hours |
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± Pulse-Shaping CIrcuits |
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± Missing-Pulse Detectors |
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± Tone-Burst Generators |
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± Pulse-Width Modulators |
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± Pulse-Position Modulators |
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± Sequential Timers |
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± Pulse Generators |
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± Frequency Dividers |
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± Application Timers |
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± Industrial Controls |
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± Touch-Tone Encoders |
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description
These devices provide two independent timing circuits of the NE555, SA555, or SE555 type in each package. These circuits can be operated in the astable or the monostable mode with external resistor-capacitor (RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the bias of the control-voltage input.
The threshold (THRES) and trigger (TRIG) levels are normally two-thirds and one-third, respectively, of VCC. These levels can be altered by using the control-voltage (CONT) terminal. When the trigger input falls below 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 the reset input goes low, the flip-flop is reset and the output goes low. When the output is low, a low-impedance path is provided between the discharge (DISCH) terminal and ground (GND).
The NE556 is characterized for operation from 0°C to 70°C. The SA556 is characterized for operation from ±40°C to 85°C, and the SE556 is characterized for operation over the full military range of ±55°C to 125°C.
AVAILABLE OPTIONS
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VT (MAX) |
PACKAGED DEVICES |
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TA |
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SMALL OUTLINE |
CERAMIC DIP |
PLASTIC DIP |
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VCC = 15 V |
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(D) |
(J) |
(N) |
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0°C to 70°C |
11.2 V |
NE556D |
± |
NE556N |
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±40°C to 85°C |
11.2 V |
SA556D |
± |
SA556N |
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±55°C to 125°C |
10.6 V |
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SE556J |
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The D package is available taped and reeled. Add the suffix R to the device type (e.g., NE556DR).
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 1999, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
1 |
NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C ± APRIL 1978 ± REVISED DECEMBER 1999
FUNCTION TABLE (each timer)
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RESET |
TRIGGER VOLTAGE² |
THRESHOLD VOLTAGE² |
OUTPUT |
DISCHARGE SWITCH |
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Low |
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Irrelevant |
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Irrelevant |
Low |
On |
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High |
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< 1/3 VDD |
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Irrelevant |
High |
Off |
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High |
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> 1/3 VDD |
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> 2/3 VDD |
Low |
On |
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High |
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> 1/3 VDD |
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> 2/3 VDD |
As previously established |
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² Voltage levels shown are nominal. |
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functional block diagram, each timer |
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VCC |
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RESET |
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R |
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R1 |
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THRES |
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R 1 |
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OUT |
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CONT |
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R |
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S |
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TRIG
R
DISCH
GND
RESET can override TRIG, which can override THRES.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)³
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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. . . . . . . . . . 18 V |
Input voltage (CONT, RESET, THRES, and TRIG) . . . . . . . . . . . . . . . . . . . . . . . . . |
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. . . . . . . . . VCC |
Output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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. . . . . ±225 mA |
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
See Dissipation Rating Table |
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Package thermal impedance, θJA (see Note 2): D package . . . . . . . . . . . . . . . . |
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. . . . . . 86°C/W |
N package . . . . . . . . . . . . . . . . |
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. . . . . . 80°C/W |
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . |
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. . . . . . . 300°C |
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package . . . . . . . . . |
. . . . . . . 260°C |
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Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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±65°C to 150°C |
³Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values are with respect to network ground terminal.
2. The package thermal impedance is calculated in accordance with JESD 51.
DISSIPATION RATING TABLE
PACKAGE |
TA ≤ 25°C |
DERATING FACTOR |
TA = 70°C |
TA = 85°C |
TA = 125°C |
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POWER RATING |
ABOVE TA = 25°C |
POWER RATING |
POWER RATING |
POWER RATING |
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J |
1375 mW |
11.0 mW/°C |
880 mW |
715 mW |
275 mW |
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2 |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |