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

Size: px

Start display at page:

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

Debra Summers
5 years ago
Views:

1 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 : +2 to +18 HIGH OUTPUT CURRENT CAPABILITY SUPPLY CURRENT SPIKES REDUCED. DURING OUTPUT TRANSITIONS HIGH INPUT IMPEDANCE : Ω OUTPUT COMPATIBLE WITH TTL,CMOS AND LOGIC MOS N DIP8 (Plastic Package) D SO8 (Plastic Micropackage) P TSSOP8 (Thin Shrink Small Outline Package) ORDER CODES Part Number Temperature Package Range N D P TS555C 0 o C, +70 o C TS555I -40, +125 o C TS555M -55, +125 o C Examples : TS555CD, TS555IN PIN CONNECTIONS (top view) DESCRIPTION The TS555 is a single CMOS timer which offers very low consumption (Icc (TYP) TS555 = 100µA Icc(TYP) NE555 = 3mA) and high frequency (f(max.) TS555 = 2.7MHz - f(max.) NE555 = 0.1 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 (10 12 Ω). GND Trigger Output Reset CC Discharge Threshold Control oltage January /12

2 BLOCK DIAGRAM CC Reset 8 4 TS555 Threshold 6 Control oltage 5 R R + - A R1 R S Q 3 Output + Trigger 2 R 1 Ground - B 7 Discharge RESET TRIGGER THRESHOLD 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 ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit CC Supply oltage +18 TJ Junction Temperature +150 o C THERMAL CHARACTERISTICS Symbol Parameter alue Unit TOPER Operating Temperature Range TS555C TS555I TS555M 0 to to to +125 TSTG Storage Temperature Range -65 to +150 o C o C 2/12

3 SCHEMATIC DIAGRAM R1 50k Ω Τ1 R2 50k Ω Control oltage R3 50k Ω R4 50k Ω R5 50k Ω R6 50k Ω Τ2 Τ10 Τ11 Threshold R7 Τ8 Τ9 Τ4 Τ5 Τ6 Τ7 Τ14 CC Τ12 Τ13 Τ21 Τ20 Trigger Τ18 Τ19 Τ17 Τ15 Τ16 GND RESET Τ25 Τ23 Τ22 Τ26 Τ24 Τ27 Τ30 Τ31 Τ34 Discharge Τ28 Τ29 Τ32 Τ35 Τ33 Output 3/12

4 OPERATING CONDITIONS Symbol Parameter alue Unit CC Supply oltage +2 to +16 STATIC ELECTRICAL CHARACTERISTICS CC = +2, Tamb = +25 o C, Reset to CC (unless otherwise specified) Symbol ICC CL dis OL OH trig Parameter Supply Current (no load, High and Low States) Control oltage Tmin. Tamb Tmax. Discharge Saturation oltage (Idis = 1mA) Low Level Output oltage (I sink = 1mA) High Level Output oltage (I source = -0.3mA) Trigger oltage TS555C-TS555I-TS555M Min. Typ Max I trig Trigger Current 10 pa I TH Threshold Current 10 pa reset Reset oltage Tmin. Tamb Tmax Ireset Reset Current 10 pa Idis Discharge Pin Leakage Current na Unit µa 4/12

5 STATIC ELECTRICAL CHARACTERISTICS (continued) CC = +5, Tamb = +25 o C, Reset to CC (unless otherwise specified) Symbol I CC CL dis OL OH trig Parameter Supply Current (no load, High and Low States) Control oltage Tmin. Tamb Tmax. Discharge Saturation oltage (Idis = 10mA) Low Level Output oltage (I sink = 8mA) High Level Output oltage (I source = -2mA) Trigger oltage TS555C-TS555I-TS555M Min. Typ Max I trig Trigger Current 10 pa I TH Threshold Current 10 pa reset Reset oltage Tmin. Tamb Tmax Ireset Reset Current 10 pa Idis Discharge Pin Leakage Current na Unit µa 5/12

6 STATIC ELECTRICAL CHARACTERISTICS (continued) CC = +12, Tamb = +25 o C, Reset to CC (unless otherwise specified) Symbol I CC CL dis OL OH trig Parameter Supply Current (no load, High and Low States) Control oltage Tmin. Tamb Tmax. Discharge Saturation oltage (Idis = 80mA) Low Level Output oltage (I sink = 50mA) High Level Output oltage (I source = -10mA) Trigger oltage TS555C-TS555I-TS555M Min. Typ Max I trig Trigger Current 10 pa I TH Threshold Current 10 pa reset Reset oltage Tmin. Tamb Tmax Ireset Reset Current 10 pa Idis Discharge Pin Leakage Current na Unit µa 6/12

7 DYNAMIC ELECTRICAL CHARACTERISTICS Tamb = +25 o C, Reset to CC (unless otherwise specified) Symbol f max Parameter Timing Accuracy (Monostable) - (note 1) R = 10kΩ, C = 0.1µF CC = + 2 CC = + 5 CC = +12 TS555C-TS555I-TS555M Min Typ Max Timing Shift with supply voltage variations (Monostable) R = 10kΩ, C = 0.1µF, CC = + 5 +/ Timing Shift with temperature, CC = Maximum astable frequency RA = 470Ω, RB = 200Ω, C = 200pF, CC = Astable frequency accuracy - (note 2) R A = R B = 1kΩ to 100kΩ, C = 0.1µF CC = + 5 CC = Unit % %/ ppm/ C Timing Shift with supply voltage variations (Astable mode) %/ R A = R B = 1kΩ to 100kΩ, C = 0.1µF, CC = 5 to t r Output Rise Time ( CC = + 5, C load = 10pF) 25 ns t f Output Fall Time ( CC = + 5, C load = 10pF) 20 - ns t pd Trigger Propagation Delay ( CC = + 5) 100 ns trpw Minimum Reset Pulse Width (trig = + 5) 350 ns Notes : 1. See Figure 2 2. See Figure 4 MHz % 7/12

8 TYPICAL CHARACTERISTICS Figure 1 : Supply Current (each timer) versus Supply oltage SUPPLY CURRENT, I CC ( µ A) APPLICATION INFORMATION MONOSTABLE OPERATION In the monostable mode,the timer functions as a one-shot. Referring to figure 2 the external capacitor is initially held discharged by a transistor inside the timer. Figure SUPPLY OLTAGE, CC () The circuit triggers on a negative-going input signal when the level reaches 1/3 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 = 1.1 R 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 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. 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 = 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 t = 0.1 ms / div Reset INPUT = 2.0/div R 4 8 Trigger 2 TS C OUTPUT OLTAGE = 5.0/div Out Control oltage 0.01 µ F CAPACITOR OLTAGE = 2.0/div R = 9.1k Ω, C = 0.01 µ F, R L = 1.0k Ω 8/12

9 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 1/3 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 5 shows actual waveforms generated in this Figure 4 mode of operation. The charge time (output HIGH) is given by : t1 = (R A + R B) C and the discharge time (output LOW) by : t2 = (R B) C Thus the total period T is given by : T = t1 + t2 = (R A + 2R B) C The frequency of oscillation is then : f = 1 T = 1.44 (R A + 2R B)C R B The duty cycle is given by : D = R A + 2R B Figure 5 CC Reset t = 0.5 ms / div OUTPUT OLTAGE = 5.0/div 4 8 RA Out 3 7 TS555 RB Control oltage 0.01 µ F C CAPACITOR OLTAGE = 1.0/div R = R = 4.8 k Ω, C = 0.1 µ F, R L= 1.0kΩ A B 9/12

10 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. A a B b b D E e e e F i L Z /12

11 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (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.) 11/12

12 PACKAGE MECHANICAL DATA 8 PINS - THIN SHRINK SMALL OUTLINE PACKAGE Dim. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A A A b c D E E e k 0 o 8 o 0 o 8 o 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 trademark of STMicroelectronics 1999 STMicroelectronics Printed in Italy All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 12/12

13 This datasheet has been download from: Datasheets for electronics components.

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

. VERY LOW POWER CONSUMPTION :.WIDE SINGLE SUPPLY RANGE : . PIN-TO-PIN AND FUNCTIONALLY COMPAT- . OUTPUT COMPATIBLE WITH TTL,CMOS TS3V555 TS3555 3 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