TS555C,I,M LOW POWER SINGLE CMOS TIMERS .. . . .. . .. VERY LOW POWER CONSUMPTION : 100µA typ at VCC = 5V HIGH MAXIMUM ASTABLE FREQUENCY 2.7MHz PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555 VOLTAGE RANGE : +2V to +18V HIGH OUTPUT CURRENT CAPABILITY SUPPLY CURRENT SPIKES REDUCED DURING OUTPUT TRANSITIONS HIGH INPUT IMPEDANCE : 1012 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 Package Temperature Range Part Number o o N D P TS555C 0 C, +70 C ● ● ● TS555I -40, +125oC ● ● ● TS555M -55, +125 C ● ● ● o 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 (1012 Ω). January 1999 GND 1 8 VCC Trigger 2 7 Discharge Output 3 6 Threshold Reset 4 5 Control Voltage 1/12 TS555C,I,M BLOCK DIAGRAM VCC R eset 8 4 TS555 R R1 Thres hold 6 Q + 3 Output 7 Dis charge R Control 5 Vol tage - A S R + Tr igger 2 - B R 1 Ground RESET TRIGGER THRESHOLD OUTPUT Low x x Low High Low x High High High High Low High High Low Previous State LOW HIGH X ↔ ↔ ↔ Level Voltage ≤ Min voltage specified Level Voltage ≥ Max voltage specified Irrelevant ABSOLUTE MAXIMUM RATINGS Symbol VCC TJ Parameter Value Supply Voltage +18 Junction Temperature +150 Unit V o C THERMAL CHARACTERISTICS Symbol TOPER TSTG 2/12 Parameter Value Operating Temperature Range TS555C TS555I TS555M 0 to +70 -40 to +125 -55 to +125 Storage Temperature Range -65 to +150 Unit o C o C R1 Ω Ω 50k Ω R6 50k R5 50k R4 50k Ω R3 Control Voltage 50k Ω R2 50k Ω Τ1 Τ5 Τ4 Τ2 Τ6 Threshold Τ7 Τ8 Τ9 R7 Τ11 Τ10 Τ14 Τ15 Τ12 Τ18 Τ13 GND V Τ16 Τ20 CC RESET Τ17 Τ19 Trigger Τ21 Τ22 Τ23 Τ25 Τ24 Τ26 Τ28 Τ27 Τ29 Τ30 Τ32 Τ31 Τ33 Τ35 Discharge Τ34 Output TS555C,I,M SCHEMATIC DIAGRAM 3/12 TS555C,I,M OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage Value Unit +2 to +16 V STATIC ELECTRICAL CHARACTERISTICS VCC = +2V, T amb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC VCL Vdis VOL VOH Vtrig Parameter TS555C-TS555I-TS555M Min. Typ Max. 65 200 200 1.3 1.4 1.5 Discharge Saturation Voltage (Idis = 1mA) Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. 0.05 0.2 0.25 Low Level Output Voltage (Isink = 1mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 0.1 0.3 0.35 Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. Control Voltage Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. Unit µA V 1.2 1.1 V V V High Level Output Voltage (Isource = -0.3mA) Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. 1.5 1.5 1.9 Trigger Voltage o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 0.4 0.3 0.67 V 0.95 1.05 Itrig Trigger Current 10 pA ITH Threshold Current 10 pA Vreset Ireset Idis 4/12 Reset Voltage o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. V 0.4 0.3 1.1 Reset Current 10 Discharge Pin Leakage Current 1 1.5 2.0 pA 100 nA TS555C,I,M STATIC ELECTRICAL CHARACTERISTICS (continued) VCC = +5V, T amb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC VCL Vdis VOL VOH Vtrig Parameter TS555C-TS555I-TS555M Min. Typ Max. 110 250 250 3.3 3.8 3.9 Discharge Saturation Voltage (Idis = 10mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 0.2 0.3 0.35 Low Level Output Voltage (Isink = 8mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 0.3 0.6 0.8 Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. Control Voltage Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. Unit µA V 2.9 2.8 V V V High Level Output Voltage (Isource = -2mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 4.4 4.4 4.6 Trigger Voltage o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 1.36 1.26 1.67 V 1.96 2.06 Itrig Trigger Current 10 pA ITH Threshold Current 10 pA Vreset Ireset Idis Reset Voltage Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. V 0.4 0.3 1.1 Reset Current 10 Discharge Pin Leakage Current 1 1.5 2.0 pA 100 nA 5/12 TS555C,I,M STATIC ELECTRICAL CHARACTERISTICS (continued) VCC = +12V, Tamb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC VCL Vdis VOL VOH Vtrig Parameter TS555C-TS555I-TS555M Min. Typ Max. 170 400 400 8 8.6 8.7 Discharge Saturation Voltage (Idis = 80mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 0.09 1.6 2.0 Low Level Output Voltage (Isink = 50mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 1.2 2 2.8 Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. Control Voltage Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. Unit µA V 7.4 7.3 V V V High Level Output Voltage (Isource = -10mA) o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 10.5 10.5 11 Trigger Voltage o Tamb = + 25 C Tmin. ≤ Tamb ≤ Tmax. 3.2 3.1 4 V 4.8 4.9 Itrig Trigger Current 10 pA ITH Threshold Current 10 pA Vreset Ireset Idis 6/12 Reset Voltage Tamb = + 25oC Tmin. ≤ Tamb ≤ Tmax. V 0.4 0.3 1.1 Reset Current 10 Discharge Pin Leakage Current 1 1.5 2.0 pA 100 nA TS555C,I,M DYNAMIC ELECTRICAL CHARACTERISTICS Tamb = +25oC, Reset to VCC (unless otherwise specified) Symbol TS555C-TS555I-TS555M Parameter Min Typ Max Timing Accuracy (Monostable) - (note 1) R = 10kΩ , C = 0.1µF % VCC = + 2V VCC = + 5V VCC = +12V Timing Shift with supply voltage variations (Monostable) R = 10kΩ , C = 0.1µF, V CC = + 5V +/-1V Timing Shift with temperature Tmin. ≤ Tamb ≤ Tmax., VCC = + 5V fmax 1 2 4 %/V 0.38 ppm/°C 75 MHz Maximum astable frequency R A = 470Ω , RB = 200Ω, C = 200pF , VCC = + 5V Astable frequency accuracy - (note 2) R A = RB = 1kΩ to 100kΩ, C = 0.1µF Unit 2.7 % VCC = + 5V VCC = + 12V 3 3 %/V Timing Shift with supply voltage variations (Astable mode) R A = RB = 1kΩ to 100kΩ, C = 0.1µF, V CC = 5 to+ 12V 0.1 tr Output Rise Time (VCC = + 5V , Cload = 10pF) 25 tf ns Output Fall Time (VCC = + 5V , Cloa d = 10pF) 20 tpd Trigger Propagation Delay (VCC = + 5V) 100 - ns ns trpw Minimum Reset Pulse Width (Vtrig = + 5V) 350 ns Notes : 1. See Figure 2 2. See Figure 4 7/12 TS555C,I,M TYPICAL CHARACTERISTICS Figure 1 : Supply Current (each timer) versus Supply Voltage SUPPLY CURRENT, I CC (µA) 300 200 100 0 4 8 12 16 SUPPLY VOLTAGE, V CC (V) 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 2 The circuit triggers on a negative-goinginput signal when the level reaches 1/3 VCC. 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 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 simultaneouslyto 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 VCC, 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 VCC t = 0.1 ms / div Reset INPUT = 2.0V/div R 4 Trigger 8 7 2 OUTPUT VOLTAGE = 5.0V/div TS555 Out 6 C 5 3 1 Control Voltage 0.01µF CAPACITOR VOLTAGE = 2.0V/div R = 9.1kΩ , C = 0.01µ F , RL = 1.0k Ω 8/12 TS555C,I,M 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 RA a n d RB and discharges through RB 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 VCC and 2/3 VCC. 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 = 0.693 (RA + RB) C and the discharge time (output LOW) by : t2 = 0.693 (RB) C Thus the total period T is given by : T = t1 + t2 = 0.693 (RA + 2RB) C The frequency of oscillation is then : 1 1.44 f= = T (RA + 2RB)C The duty cycle is given by : D = RB RA + 2RB Figure 5 t = 0.5 ms / div VCC OUTPUT VOLTAGE = 5.0V/div Reset RA 8 4 Out 3 7 TS555 Control Voltage 0.01 µ F RB 6 5 1 2 C CAPACITOR VOLTAGE = 1.0V/div R = R = 4.8 kΩ, C = 0.1 µ F , R L = 1.0k Ω A B 9/12 TS555C,I,M PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP Dimensions A a1 B b b1 D E e e3 e4 F i L Z 10/12 Min. Millimeters Typ. 3.32 0.51 1.15 0.356 0.204 Max. 1.65 0.55 0.304 10.92 9.75 7.95 Min. 0.020 0.045 0.014 0.008 Max. 0.065 0.022 0.012 0.430 0.384 0.313 2.54 7.62 7.62 3.18 Inches Typ. 0.131 0.100 0.300 0.300 6.6 5.08 3.81 1.52 0.125 0260 0.200 0.150 0.060 TS555C,I,M PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) Dimensions A a1 a2 a3 b b1 C c1 D E e e3 F L M S Min. Millimeters Typ. 0.1 0.65 0.35 0.19 0.25 Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 Min. Inches Typ. 0.026 0.014 0.007 0.010 Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.189 0.228 0.197 0.244 0.004 o 45 (typ.) 4.8 5.8 5.0 6.2 1.27 3.81 3.8 0.4 0.050 0.150 4.0 1.27 0.6 0.150 0.016 0.157 0.050 0.024 o 8 (max.) 11/12 TS555C,I,M PACKAGE MECHANICAL DATA 8 PINS - THIN SHRINK SMALL OUTLINE PACKAGE Dim. Millimeters Min. Typ. A Max. Min. Typ. 1.20 A1 0.05 A2 0.80 b 0.19 c 0.09 D 2.90 E E1 Inches 0.15 1.00 3.00 0.05 0.01 1.05 0.031 0.30 0.007 0.20 0.003 3.10 0.114 6.40 4.30 e 4.40 o 0 l 0.50 4.50 0.039 0.041 0.15 0.012 0.118 0.122 0.169 0.173 0.177 0.025 o 0.60 0.006 0.252 0.65 k Max. o 8 0 0.75 0.09 8 0.0236 o 0.030 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 pub lication 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. http://www.st.com 12/12