. VERY LOW POWER CONSUMPTION :.WIDE SINGLE SUPPLY RANGE : . PIN-TO-PIN AND FUNCTIONALLY COMPAT- . OUTPUT COMPATIBLE WITH TTL,CMOS TS3V555

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1 TS LOW POWE SINGLE TIMES. DEDICATED TO 3.3 O BATTEY SUPPLY (Specified at 3 and 5). EY LOW POWE CONSUMPTION : 90µA at CC =3.WIDE SINGLE SUPPLY ANGE : +2.7 to +16. HIGH OUTPUT CUENT CAPABILITY. SUPPLY CUENT SPIKES EDUCED DUING OUTPUT TANSITIONS HIGH INPUT IMPEDANCE : Ω. PIN-TO-PIN AND FUNCTIONALLY COMPAT- IBLE WITH BIPOLA NE555 AND CMOS TS555. OUTPUT COMPATIBLE WITH TTL,CMOS AND LOGIC MOS DESCIPTION The TS3555 with its low consumption (90µA at CC = 3) is a single CMOS timer dedicated to 3.3 or battery supply (specified at 3 and 5) offering also a high frequency (f (max) 2MHz at CC =3and 2.7 MHz at CC = 5). Thus, either in monostable or astable mode, timing remains very accurate. Timing capacitors can also be minimized due to high input impedance (10 12 Ω). ODE CODES N DIP8 (Plastic Package) D SO8 (Plastic Micropackage) Temperature Package Part Number ange N D TS3555I,AI -40, +125 o C TBL PIN CONNECTIONS (top view) GND Trigger CC Discharge Output eset Threshold Control oltage EPS December /8

2 TS3555 BLOCK DIAGAM CC eset Threshold Control oltage A 1 Q 3 Output S + Trigger 2 - B 1 Ground 7 Discharge EPS FUNCTION TABLE ESET TIGGE THESHOLD OUTPUT Low x x Low High Low x High High High High Low High High Low Previous State LOW Level oltage Min voltage specified HIGH Level oltage Max voltage specified X Irrelevant TBL ABSOLUTE MAXIMUM ATINGS Symbol Parameter alue Unit CC Supply oltage +18 TJ Junction Temperature +150 o C TBL THEMAL CHAACTEISTICS Symbol Parameter alue Unit Operating Temperature ange TS3555I,AI -40 to +125 T stg Storage Temperature ange -65 to +150 T oper o C o C TBL OPEATING CONDITIONS Symbol Parameter alue Unit CC Supply oltage +2.7 to TBL 2/8

3 TS3555 ELECTICAL CHAACTEISTICS CC = +3, Tamb = +25 o C, eset to CC (unless otherwise specified) STATIC Symbol I CC CL DIS OL OH TIG Parameter Supply Current - (no load, High and Low States) Tamb = +25 o C Control oltage Tamb = +25 o C T min. T amb T max. Discharge Saturation oltage (I DIS = 1mA) T amb = +25 o C T min. T amb T max. Low Level Output oltage (ISINK = 1mA) Tamb = +25 o C High Level Output oltage (ISOUCE = -0.3mA) T amb = +25 o C T min. T amb T max. Trigger oltage Tamb = +25 o C TS3555I Min. Typ. Max I TIG Trigger Current 10 pa I TH Threshold Current 10 pa ESET eset oltage IESET eset Current 10 pa IDIS Discharge Pin Leakage Current na Unit µa TBL DYNAMIC Symbol Parameter TS3555I Min. Typ. Max. Unit Timing Accuracy (Monostable) % = 10kΩ, C = 0.1µF - (note 1) 1 Timing Shift with supply voltage variations (Monostable) %/ = 10kΩ, C = 0.1µF, CC = +3 +/ (note 1) 0.5 Timing Shift with temperature - (note 1) 75 ppm/ C fmax Maximum astable frequency - (note 2) MHz A = 470Ω, B = 200Ω, C = 200pF 2 Astable frequency accuracy - (note 2) % A = B = 1kΩto 100kΩ, C = 0.1µF 5 Timing Shift with supply voltage variations (Astable mode) - (note 2) %/ A = B = 10kΩ, C = 0.1µF, CC = +3 to tr Output ise Time (CLOAD = 10pF) 25 ns t f Output Fall Time (C LOAD = 10pF) 20 ns t PD Trigger Propagation Delay 100 ns tpw Minimum eset Pulse Width (TIG = +3) 350 ns Note : 1. See Figure 2 2. See Figure 4 3/ TBL

4 TS3555 ELECTICAL CHAACTEISTICS CC = +5, Tamb = +25 o C, eset to CC (unless otherwise specified) STATIC Symbol I CC CL DIS OL OH TIG Parameter Supply Current - (no load, High and Low States) Control oltage T min. T amb T max. Discharge Saturation oltage (I DIS = 10mA) T amb = +25 C T min. T amb T max. Low Level Output oltage (ISINK = 8mA) High Level Output oltage (ISOUCE = -2mA) T amb = +25 C T min. T amb T max. Trigger oltage TS3555I Min. Typ. Max I TIG Trigger Current 10 pa I TH Threshold Current 10 pa ESET eset oltage IESET eset Current 10 pa IDIS Discharge Pin Leakage Current na Unit µa TBL DYNAMIC Symbol Parameter TS3555I Min. Typ. Max. Unit Timing Accuracy (Monostable) - (note1) % = 10kΩ, C = 0.1µF - (note 1) 2 Timing Shift with supply voltage variations (Monostable) - (note1) %/ = 10kΩ, C = 0.1µF, CC = +5 +/ Timing Shift with temperature - (note1) ppm/ C Tmin. Tamb Tmax. 75 fmax Maximum astable frequency - (note 2) MHz A = 470Ω, B = 200Ω, C = 200pF 2.7 Astable frequency accuracy - (note 2) A =B=1kΩto 100kΩ,C =0.1µF 3 % Timing Shift with supply voltage variations (Astable mode) - (note 2) %/ A = B = 10kΩ, C = 0.1µF, CC = +5 to t r Output ise Time (C LOAD = 10pF) 25 ns tf Output Fall Time (CLOAD = 10pF) 20 ns t PD Trigger Propagation Delay 100 ns t PW Minimum eset Pulse Width ( TIG = +5) 350 ns Note : 1. See Figure 2 2. See Figure 4 4/ TBL

5 TS3555 TYPICAL CHAACTEISTICS Figure 1 : SUPPLY CUENT, I CC ( µ A) APPLICATION INFOMATION MONOSTABLE OPEATION In the monostable mode,the timer functions as a one-shot. eferring to figure 2 the external capacitor is initially held discharged by a transistor inside the timer. Figure 2 CC Trigger eset 2 Supply Current (each timer) versus supply voltage SUPPLYOLTAGE, CC () EPS The circuit triggers on a negative-goinginput signal when the level reaches 1/3 CC. Oncetriggered,the circuit remains in this state until the set time has elapsed,even if it is triggered again during this interval. The duration of the output HIGH state is given by t = 1.1 x C. Notice that since the charge rate and the threshold level of the comparator are both directly proportional to supply voltage, the timing interval is independent of supply. Applying a negative pulse simultaneouslyto the eset terminal (pin 4) and the Trigger terminal (pin 2) during the timing cycle discharges the external capacitor and causes the cycle to start over. The timing cycle now starts on the positive edge of the reset pulse. During the time the reset pulse is applied, the output is driven to its LOW state. When a negative trigger pulse is applied to pin 2, the flip-flop is set, releasing the short circuit across the external capacitor and driving the output HIGH. The voltage across the capacitor increases exponentially with the time constant τ = x C. When the voltage across the capacitor equals 2/3 CC, the comparator resets the flip-flop which then discharges the capacitor rapidly and drives the output to its LOW state. Figure 3 shows the actual waveforms generated in this mode of operation. When eset is not used, it should be tied high to avoid any possible or false triggering. Figure 3 t = 0.1 ms / div INPUT = 2.0/div TS C Out Control oltage 0.01µ F EPS OUTPUT OLTAGE = 5.0/div CAPACITO OLTAGE = 2.0/div = 9.1k Ω, C = 0.01µ F, L = 1.0kΩ EPS 5/8

6 TS3555 ASTABLE OPEATION When the circuit is connected as shown in figure 4 (pin 2 and 6 connected) it triggers itself and free runs as a multivibrator. The external capacitor charges through A and B and discharges through B only. Thus the duty cycle may be precisely set by the ratio of these two resistors. In the astable mode of operation, C charges and discharges between 1/3 CC and 2/3 CC. Asinthe triggered mode, the charge and discharge times and therefore frequency, are independent of the supply voltage. Figure 5 shows actual waveforms generated in this mode of operation. Figure 4 CC eset The charge time (output HIGH) is given by : t1 = ( A + B )C and the discharge time (output LOW) by : t2 = (B) C Thus the total period T is given by : T = t1 + t2 = (A +2B)C The frequency of oscillation is then : f = 1 T = 1.44 ( A + 2 B ) C The duty cycle is given by : D = Figure 5 t = 0.5 ms / div OUTPUT OLTAGE = 5.0/div B A + 2 B 4 8 A Out 3 7 TS3555 B Control oltage 0.01 µ F C EPS CAPACITO OLTAGE = 1.0/div = = 4.8 k Ω, C = 0.1 µ F, L = 1.0kΩ A B EPS 6/8

7 TS3555 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP PM-DIP8.EPS Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. A a B b b D E e e e F i L Z DIP8.TBL 7/8

8 TS3555 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICOPACKAGE (SO) Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. A a a a b b C c1 45 o (typ.) D E e e F L M S 8 o (max.) Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics - All ights eserved SGS-THOMSON Microelectronics GOUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. ODE CODE : SO8.TBL PM-SO8.EPS 8/8

. HIGH MAXIMUM ASTABLE FREQUENCY 2.7MHz PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555

TS555C,I,M LOW POWER SINGLE CMOS TIMERS. ERY LOW POWER CONSUMPTION : 100µA typ at CC = 5. HIGH MAXIMUM ASTABLE FREQUENCY 2.7MHz PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555. OLTAGE RANGE :