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| (R) TS555C,I,M LOW POWER SINGLE CMOS TIMERS . . . . . . . . . VERY LOW POWER CONSUMPTION : 100A 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 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 TS555C TS555I TS555M Temperature Range 0 C, +70 C -40, +125oC -55, +125 C o o o Package N q q q D q q q P q q q Examples : TS555CD , TS555IN PIN CONNECTIONS (top view) DESCRIPTION The TS555 is a single CMOS timer which offers very low consumption (Icc(TYP) TS555 = 100A 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 ). January 1999 GND Trigger Output Reset 1 2 3 4 8 7 6 5 VCC Discharge Threshold Control Voltage 1/12 TS555C,I,M BLOCK DIAGRAM V CC 8 R eset 4 TS555 R R1 Thres hold 6 Control 5 Vol tage R + + Q R A S 3 Output - Tr igger 2 R - B 7 Dis charge 1 Ground RESET Low High High High LOW HIGH X TRIGGER x Low High High THRESHOLD x x High Low OUTPUT Low High Low Previous State Level Voltage Min voltage specified Level Voltage Max voltage specified Irrelevant ABSOLUTE MAXIMUM RATINGS Symbol VCC TJ Parameter Supply Voltage Junction Temperature Value +18 +150 Unit V o C THERMAL CHARACTERISTICS Symbol TOPER Parameter Operating Temperature Range TS555C TS555I TS555M Storage Temperature Range Value 0 to +70 -40 to +125 -55 to +125 -65 to +150 o Unit o C TSTG C 2/12 V CC R1 SCHEMATIC DIAGRAM 50k 1 21 20 26 27 31 30 11 2 12 13 10 R2 50k R7 Threshold 34 Control Voltage 8 9 25 R3 4 Output Trigger 50k R4 50k 6 7 23 14 18 19 24 Discharge R5 5 50k 28 29 32 35 R6 17 15 16 22 33 50k GND RESET TS555C,I,M 3/12 TS555C,I,M OPERATING CONDITIONS Symbol VCC Supply Voltage Parameter Value +2 to +16 Unit V STATIC ELECTRICAL CHARACTERISTICS VCC = +2V, T amb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC Parameter Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. Tamb Tmax. Control Voltage Tamb = + 25oC Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 1mA) Tamb = + 25oC Tmin. Tamb Tmax. Low Level Output Voltage (Isink = 1mA) o Tamb = + 25 C Tmin. Tamb Tmax. High Level Output Voltage (Isource = -0.3mA) Tamb = + 25oC Tmin. Tamb Tmax. Trigger Voltage o Tamb = + 25 C Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage o Tamb = + 25 C Tmin. Tamb Tmax. Reset Current Discharge Pin Leakage Current 0.4 0.3 1.5 1.5 0.4 0.3 1.2 1.1 TS555C-TS555I-TS555M Min. Typ 65 Max. 200 200 1.4 1.5 V 0.05 0.2 0.25 V 0.1 0.3 0.35 V 1.9 V 0.67 10 10 1.1 10 1 100 1.5 2.0 pA nA 0.95 1.05 pA pA V Unit A V VCL 1.3 Vdis VOL VOH Vtrig Itrig ITH Vreset Ireset Idis 4/12 TS555C,I,M STATIC ELECTRICAL CHARACTERISTICS (continued) VCC = +5V, T amb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC Parameter Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. Tamb Tmax. Control Voltage Tamb = + 25oC Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 10mA) o Tamb = + 25 C Tmin. Tamb Tmax. Low Level Output Voltage (Isink = 8mA) o Tamb = + 25 C Tmin. Tamb Tmax. High Level Output Voltage (Isource = -2mA) o Tamb = + 25 C Tmin. Tamb Tmax. Trigger Voltage o Tamb = + 25 C Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tamb = + 25oC Tmin. Tamb Tmax. Reset Current Discharge Pin Leakage Current 0.4 0.3 4.4 4.4 1.36 1.26 2.9 2.8 TS555C-TS555I-TS555M Min. Typ 110 Max. 250 250 3.8 3.9 V 0.2 0.3 0.35 V 0.3 0.6 0.8 V 4.6 V 1.67 10 10 1.1 10 1 100 1.5 2.0 pA nA 1.96 2.06 pA pA V Unit A V VCL 3.3 Vdis VOL VOH Vtrig Itrig ITH Vreset Ireset Idis 5/12 TS555C,I,M STATIC ELECTRICAL CHARACTERISTICS (continued) VCC = +12V, Tamb = +25oC, Reset to VCC (unless otherwise specified) Symbol ICC Parameter Supply Current (no load, High and Low States) o Tamb = + 25 C Tmin. Tamb Tmax. Control Voltage Tamb = + 25oC Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 80mA) o Tamb = + 25 C Tmin. Tamb Tmax. Low Level Output Voltage (Isink = 50mA) o Tamb = + 25 C Tmin. Tamb Tmax. High Level Output Voltage (Isource = -10mA) o Tamb = + 25 C Tmin. Tamb Tmax. Trigger Voltage o Tamb = + 25 C Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tamb = + 25oC Tmin. Tamb Tmax. Reset Current Discharge Pin Leakage Current 0.4 0.3 10.5 10.5 3.2 3.1 7.4 7.3 TS555C-TS555I-TS555M Min. Typ 170 Max. 400 400 8.6 8.7 V 0.09 1.6 2.0 V 1.2 2 2.8 V 11 V 4 10 10 1.1 10 1 100 1.5 2.0 pA nA 4.8 4.9 pA pA V Unit A V VCL 8 Vdis VOL VOH Vtrig Itrig ITH Vreset Ireset Idis 6/12 TS555C,I,M DYNAMIC ELECTRICAL CHARACTERISTICS Tamb = +25oC, Reset to VCC (unless otherwise specified) Symbol Parameter Timing Accuracy (Monostable) - (note 1) R = 10k , C = 0.1F VCC = + 2V VCC = + 5V VCC = +12V Timing Shift with supply voltage variations (Monostable) R = 10k , C = 0.1F, V CC = + 5V +/-1V Timing Shift with temperature Tmin. Tamb Tmax., VCC = + 5V fmax Maximum astable frequency R A = 470 , RB = 200, C = 200pF , VCC = + 5V Astable frequency accuracy - (note 2) R A = RB = 1k to 100k, C = 0.1F VCC = + 5V VCC = + 12V Timing Shift with supply voltage variations (Astable mode) R A = RB = 1k to 100k, C = 0.1F, V CC = 5 to+ 12V tr tf tpd trpw Output Rise Time (VCC = + 5V , Cload = 10pF) Output Fall Time (VCC = + 5V , Cloa d = 10pF) Trigger Propagation Delay (VCC = + 5V) Minimum Reset Pulse Width (Vtrig = + 5V) 1 2 4 %/V 0.38 ppm/C 75 MHz 2.7 % 3 3 %/V 0.1 25 20 100 350 ns ns ns ns TS555C-TS555I-TS555M Min Typ Max Unit % 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 300 SUPPLY CURRENT, I CC (A) 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 = 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 R 4 Trigger 2 8 7 INPUT = 2.0V/div OUTPUT VOLTAGE = 5.0V/div TS555 Out 3 1 6 C 5 Control Voltage 0.01F CAPACITOR VOLTAGE = 2.0V/div R = 9.1k , C = 0.01 F , RL = 1.0k 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 VCC Reset RA 4 Out 3 8 7 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 = Figure 5 t = 0.5 ms / div OUTPUT VOLTAGE = 5.0V/div RB RA + 2RB TS555 Control Voltage 0.01 F 5 1 2 6 RB C CAPACITOR VOLTAGE = 1.0V/div R = R = 4.8 k, C = 0.1 F , R L = 1.0k 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 Min. 0.51 1.15 0.356 0.204 7.95 Millimeters Typ. 3.32 Max. Min. 0.020 0.045 0.014 0.008 0.313 Inches Typ. 0.131 Max. 1.65 0.55 0.304 10.92 9.75 2.54 7.62 7.62 6.6 5.08 3.81 1.52 0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0260 0.200 0.150 0.060 3.18 0.125 10/12 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. 0.1 0.65 0.35 0.19 0.25 4.8 5.8 Millimeters Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2 o Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228 Inches Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.) o 0.050 0.150 0.150 0.016 0.157 0.050 0.024 11/12 TS555C,I,M PACKAGE MECHANICAL DATA 8 PINS - THIN SHRINK SMALL OUTLINE PACKAGE Dim. A A1 A2 b c D E E1 e k l Millimeters Min. 0.05 0.80 0.19 0.09 2.90 4.30 0 o Inches Max. 1.20 0.15 0.01 0.031 0.007 0.003 0.114 0.169 0 o Typ. Min. Typ. Max. 0.05 0.006 1.00 1.05 0.30 0.20 0.039 0.041 0.15 0.012 3.00 6.40 4.40 0.65 3.10 4.50 8 o 0.118 0.252 0.173 0.025 0.122 0.177 8 o 0.50 0.60 0.75 0.09 0.0236 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. (c) The ST logo is a trademark of STMicroelectronics (c) 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. (c) http://www.st.com 12/12 |
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