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Part: SA556
Category:
Analog & Mixed-Signal Processing
Description: Dual Precision Timer
Company: Texas Instruments, Inc.
Datasheet: Download SA556 datasheet File size : 70 kB
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Datasheet text preview:
NE556, SA556, SE556 DUAL PRECISION TIMERS
SLFS023F APRIL 1978 REVISED MARCH 2003
D D D D D D
Two Precision Timing Circuits Per Package Astable or Monostable Operation TTL-Compatible Output Can Sink or Source Up To 150 mA Active Pullup or Pulldown Designed to Be Interchangeable With Signetics NE556, SA556, and SE556 Applications Include: Precision Timers From Microseconds to Hours Pulse-Shaping CIrcuits Missing-Pulse Detectors Tone-Burst Generators Pulse-Width Modulators Pulse-Position Modulators Sequential Timers Pulse Generators Frequency Dividers Application Timers Industrial Controls Touch-Tone Encoders
NE556 . . . D, N, OR NS PACKAGE SA556 . . . D OR N PACKAGE SE556 . . . J PACKAGE (TOP VIEW)
1DISCH 1THRES 1CONT 1RESET 1OUT 1TRIG GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VCC 2DISCH 2THRES 2CONT 2RESET 2OUT 2TRIG
description/ordering information
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 normally are 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 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 the discharge (DISCH) terminal and ground (GND). ORDERING INFORMATION
TA VT (MAX) VCC = 15 V PDIP (N) 0°C to 70°C to 70°C 11.2 V SOIC (D) (D) SOP (NS) 40°C to 85°C 55°C to 125°C to 125°C 11.2 V 10.6 V PDIP (N) CDIP (J) (J) PACKAGE Tube of 25 Tube of 50 Reel of 2500 Reel of 2000 Tube of 25 Tube of 25 of 25 ORDERABLE PART NUMBER NE556N NE556D NE556DR NE556NSR SA556N SE556J SE556JB TOP-SIDE MARKING NE556N NE556 NE556 SA556N SE556J
SE556JB Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, 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.
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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
NE556, SA556, SE556 DUAL PRECISION TIMERS
SLFS023F APRIL 1978 REVISED MARCH 2003
FUNCTION TABLE (each timer) RESET Low High High TRIGGER VOLTAGE Irrelevant 1/3 VDD THRESHOLD VOLTAGE Irrelevant Irrelevant >2/3 VDD OUTPUT Low High Low DISCHARGE SWITCH On Off On
High >1/3 VDD <2/3 VDD Voltage levels shown are nominal.
As previously established
functional block diagram, each timer
VCC RESET
THRES CONT
OUT
TRIG
DISCH GND RESET can override TRIG, which can override THRES.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Input voltage (CONT, RESET, THRES, and TRIG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC Output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±225 mA Package thermal impedance, JA (see Notes 2 and 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80°C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 76°C/W Package thermal impedance, JC (see Notes 4 and 5): J package . . . . . . . . . . . . . . . . . . . . . . . . . 15.05°C/W Operating virtual junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, N, or NS package . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" 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 "recommended operating conditions" 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. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) TA)/JA. Operating at the absolute maximum TJ of 150°C can affect reliability. 3. The package thermal impedance is calculated in accordance with JESD 51-7. 4. Maximum power dissipation is a function of TJ(max), JC, and TC. The maximum allowable power dissipation at any allowable case temperature is PD = (TJ(max) TC)/JC. Operating at the absolute maximum TJ of 150°C can affect reliability. 5. The package thermal impedance is calculated in accordance with MIL-STD-883.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
NE556, SA556, SE556 DUAL PRECISION TIMERS
SLFS023F APRIL 1978 REVISED MARCH 2003
recommended operating conditions
MIN VCC VI IO TA Supply voltage voltage Input voltage (CONT, RESET, THRES, and TRIG) Output current NE556 Operating free-air temperature SA556 SE556 0 40 55 NE556, SA556 SE556 4.5 4.5 MAX 16 18 VCC ±200 70 85 125 °C UNIT V V mA
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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