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2 LOW POWER SINGLE CMOS TIMER ERY LOW POWER CONSUMPTION : 0 µa typ at CC = 5 90 µa typ at CC = 3 HIGH MAXIMUM ASTABLE FREQUENCY 2.7MHz PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555 WIDE OLTAGE RANGE : +2 to +6 HIGH OUTPUT CURRENT CAPABILITY SUPPLY CURRENT SPIKES REDUCED DURING OUTPUT TRANSITIONS HIGH INPUT IMPEDANCE : 0 2 Ω OUTPUT COMPATIBLE WITH TTL,CMOS AND LOGIC MOS DESCRIPTION The TS555 is a single CMOS timer which offers very low consumption (I cc(typ) TS555 = 0µA at CC =+5 versus I cc(typ) NE555 = 3mA) and high frequency f f(max.) TS555 = 2.7MHz versus f (max.) NE555 = 0. MHz) Thus, either in Monostable or Astable mode, timing remains very accurate. The TS555 provides reduced supply current spikes during output transitions, which enables the use of lower decoupling capacitors compared to those required by bipolar NE555. Timing capacitors can also be minimized due to high input impedance (0 2 Ω). N DIP8 (Plastic Package) D SO8 (Plastic Micropackage) P TSSOP8 (Thin Shrink Small Outline Package) PIN CONNECTIONS (top view) ORDER CODES Package Part Number Temperature Range N D P TS555C 0 C, +70 C TS555I -40 C, +25 C TS555M -55 C, +25 C N = Dual in Line Package (DIP) D = Small Outline Package (SO) - also available in Tape & Reel (DT) P = Thin Shrink Small Outline Package (TSSOP) - only available in Tape & Reel (PT) GND Trigger Output Reset CC Discharge Threshold Control oltage February 2003 /2

3 BLOCK DIAGRAM CC Reset 8 4 TS555 Threshold 6 Control oltage 5 R R + - A R R S Q 3 Output + Trigger 2 R Ground - B 7 Discharge FUNCTION TABLE LOW RESET TRIGGER THRESHOLD OUTPUT Low x x Low High Low x High High High High Low High High Low Previous State <-----> Level oltage Min voltage specificed HIGH <-----> Level oltage Max voltage specificed x <-----> Irrelevant ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit CC Supply oltage +8 T j Junction Temperature +50 C T stg Storage Temperature Range -65 to +50 C P D SO8 Power dissipation ) DIP8 TSSOP8. T j = 50 C, T amb = 25o C with Rthja = 00 o C/W for DIP8 package Rthja = 75 o C/W for SO8 package Rthja = 200 o C/W for TSSOP8 package mw OPERATING CONDITIONS Symbol Parameter alue Unit CC Supply oltage +2 to +6 T oper Operating Free Air Temperature Range TS555C TS555I TS555M 0 to to to +25 C 2/2

4 SCHEMATIC DIAGRAM R 50k Ω Τ R2 50k Ω Control oltage R3 50k Ω R4 50k Ω R5 50k Ω R6 50k Ω Τ2 Τ0 Τ Threshold R7 Τ8 Τ9 Τ4 Τ5 Τ6 Τ7 Τ4 CC Τ2 Τ3 Τ2 Τ20 Trigger Τ8 Τ9 Τ7 Τ5 Τ6 GND RESET Τ25 Τ23 Τ22 Τ26 Τ24 Τ27 Τ30 Τ3 Τ34 Discharge Τ28 Τ29 Τ32 Τ35 Τ33 Output 3/2

5 STATIC ELECTRICAL CHARACTERISTICS CC = +2, T amb = +25 C, Reset to CC (unless otherwise specified) Supply Current (no load, High and Low States) I CC T min. T amb T µa max. 200 CL Control oltage Level Discharge Saturation oltage (I dis = ma) DIS 0.25 I DIS Discharge Pin Leakage Current 00 na Low Level Output oltage (I sink = ma) OL 0.35 High Level Output oltage (I source = -0.3mA).5.9 OH.5 TRIG Trigger oltage I TRIG Trigger Current 0 pa I TH Threshold Current 0 pa RESET Reset oltage I RESET Reset Current 0 pa 4/2

6 ELECTRICAL CHARACTERISTICS CC = +3, T amb = +25 C, Reset to CC (unless otherwise specified) Supply Current (no load, High and Low States) I CC T min. T amb T µa max. 230 CL Control oltage Level Discharge Saturation oltage (I dis = ma) DIS 0.25 I DIS Discharge Pin Leakage Current 00 na Low Level Output oltage (I sink = ma) OL 0.35 High Level Output oltage (I source = -0.3mA) OH 2.5 TRIG Trigger oltage I TRIG Trigger Current 0 pa I TH Threshold Current 0 pa RESET Reset oltage I RESET Reset Current 0 pa DYNAMIC ELECTRICAL CHARACTERISTICS CC = +3, T amb = +25 C, Reset to CC (unless otherwise specified) Timing Accuracy (Monostable) ) R = 0kΩ, C = 0.µF CC =+2 CC =+3 % Timing Shift with Supply oltage ariations (Monostable) R = 0kΩ, C = 0.µF, CC = +3 ±0.3 ) 0.5 %/ Timing Shift with Temperature ) T min. T amb T max.5 75 ppm/ C f Maximum Astable Frequency 2) max R A = 470Ω, R B = 200Ω, C = 200pF 2 MHz Astable Frequency Accuracy 2) R A =R B = kω to 00kΩ, C = 0.µF 5 % Timing Shift with Supply oltage ariations (Astable mode) 2) R A =R B = kω to 00kΩ, C = 0.µF, CC = +3 to %/ t R Output Rise Time (C load = 0pF) 25 ns t F Output Fall Time (C load = 0pF) 20 - ns t PD Trigger Propagation Delay 00 ns t RPW Minimum Reset Pulse Width ( trig = +3) 350 ns. see figure 2 2. see figure 4 5/2

7 STATIC ELECTRICAL CHARACTERISTICS CC = +5, T amb = +25 C, Reset to CC (unless otherwise specified) Supply Current (no load, High and Low States) I CC T min. T amb T µa max. 250 CL Control oltage Level DIS Discharge Saturation oltage (I dis = 0mA) I DIS Discharge Pin Leakage Current 00 na OL Low Level Output oltage (I sink = 8mA) OH High Level Output oltage (I source = -2mA) TRIG Trigger oltage I TRIG Trigger Current 0 pa I TH Threshold Current 0 pa RESET Reset oltage I RESET Reset Current 0 pa DYNAMIC ELECTRICAL CHARACTERISTICS CC = +5, T amb = +25 C, Reset to CC (unless otherwise specified) Timing Accuracy (Monostable) ) R = 0kΩ, C = 0.µF 2 % Timing Shift with Supply oltage ariations (Monostable) ) R = 0kΩ, C = 0.µF, CC = +5 ± 0.38 %/ Timing Shift with Temperature ) T min. T amb T max.5 75 ppm/ C f max Maximum Astable Frequency 2) R A = 470Ω, R B = 200Ω, C = 200pF 2.7 MHz Astable Frequency Accuracy 2) R A =R B = kω to 00kΩ, C = 0.µF 3 % Timing Shift with Supply oltage ariations (Astable mode) 2) R A =R B = 0kΩ, C = 0.µF, CC = +5 to %/ t R Output Rise Time (C load = 0pF) 25 ns t F Output Fall Time (C load = 0pF) 20 - ns t PD Trigger Propagation Delay 00 ns t RPW Minimum Reset Pulse Width ( trig = +5) 350 ns. see figure 2 2. see figure 4 6/2

8 STATIC ELECTRICAL CHARACTERISTICS CC = +2, T amb = +25 C, Reset to CC (unless otherwise specified) I CC CL DIS Supply Current (no load, High and Low States) Control oltage Level Discharge Saturation oltage (I dis = 80mA) µa I DIS Discharge Pin Leakage Current 00 na OL Low Level Output oltage (I sink = 50mA) OH High Level Output oltage (I source = -0mA) TRIG Trigger oltage I TRIG Trigger Current 0 pa I TH Threshold Current 0 pa RESET Reset oltage I RESET Reset Current 0 pa DYNAMIC ELECTRICAL CHARACTERISTICS CC = +2, T amb = +25 C, Reset to CC (unless otherwise specified) Timing Accuracy (Monostable) ) R = 0kΩ, C = 0.µF CC = +2 4 % Timing Shift with Supply oltage ariations (Monostable) ) R = 0kΩ, C = 0.µF, CC = +5 ± 0.38 %/ Timing Shift with Temperature, CC = ppm/ C f max Maximum Astable Frequency 2) R A = 470Ω, R B = 200Ω, C = 200pF, CC = MHz Astable Frequency Accuracy 2) R A =R B = kω to 00kΩ, C = 0.µF, CC = +2 3 %. see figure 2 2. see figure 4 Timing Shift with Supply oltage ariations (Astable mode) R A =R B = kω to 00kΩ, C = 0.µF, CC = 5 to %/ 7/2

9 TYPICAL CHARACTERISTICS Figure : Supply Current (each timer) versus Supply oltage SUPPLY CURRENT, I CC ( µ A) APPLICATION INFORMATION MONOSTABLE OPERATION In the monostable mode,the timer operates like a one-shot generator. Referring to figure 2, the external capacitor is initially held discharged by a transistor inside the timer. Figure 2 : SUPPLY OLTAGE, CC () The circuit triggers on a negative-going input signal when the level reaches /3 CC. Once triggered, 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 =. R x C. It can be noticed that since the charge rate and the threshold level of the comparator are both directly proportional to the supply voltage, the timing interval is independent of the supply. Applying a negative pulse simultaneously to the Reset 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. While the reset pulse is applied, the output is driven to the 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 = R 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 Reset is not used, it should be tied high to avoid any possible or false triggering. Figure 3 : CC Reset t = 0. ms / div INPUT = 2.0/div R Trigger OUTPUT OLTAGE = 5.0/div TS555 6 C Out 3 5 Control oltage 0.0 µ F CAPACITOR OLTAGE = 2.0/div R = 9.k Ω, C = 0.0 µ F, R L =.0k Ω 8/2

10 ASTABLE OPERATION 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 R A and R B and discharges through R 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 /3 CC and 2/3 CC. As in the triggered mode, the charge and discharge times and therefore frequency, are independent of the supply voltage. Figure 4: Figure 5 shows actual waveforms generated in this mode of operation. The charge time (output HIGH) is given by : t = (R A + R B ) C and the discharge time (output LOW) by : t2 = x R B x C Thus the total period T is given by : T = t + t2 = (R A + 2R B ) C The frequency of oscillation is then : f = -- T = (RA + 2RB)C The duty cycle is given by : RB D = RA + 2RB Figure 5: CC t = 0.5 ms / div Reset OUTPUT OLTAGE = 5.0/div 4 8 RA Out 3 7 TS555 RB Control oltage 0.0 µ F C CAPACITOR OLTAGE =.0/div R = R = 4.8 k Ω, C = 0. µ F, R L=.0kΩ A B 9/2

11 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP Millimeters Inches Dimensions Min. Typ. Max. Min. Typ. Max. A a B b b D E e e e F i L Z /2

12 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) L C c a2 a3 A b s a b e3 E D M 8 5 F 4 Millimeters Inches Dimensions Min. Typ. Max. Min. Typ. Max. A a a a b b C c 45 (typ.) D E e e F L M S 8 (max.) /2

13 PACKAGE MECHANICAL DATA 8 PINS - THIN SHRINK SMALL OUTLINE PACKAGE k c 0.25mm.00 inch GAGE PLANE L C L L L E SEATING PLANE A A2 A E D b e PIN IDENTIFICATION Millimeters Inches Dimensions Min. Typ. Max. Min. Typ. Max. A A A b c D E E e k l L L Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2/ STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom