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TS3V555
3V LOW POWER SINGLE TIMERS
.DEDI .VERYLOWPOWERCONSUMPTI .WI .HI .SUPPLY .HI .PI .OUTPUT
CATED TO 3.3V OR BATTERY SUPPLY (Specified at 3V and 5V) ON : 90A at VCC = 3V DE SINGLE SUPPLY RANGE : +2.7V to +16V GH OUTPUT CURRENT CAPABILITY CURRENT SPIKES REDUCED DURING OUTPUT TRANSITIONS GH INPUT IMPEDANCE : 1012 N-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555 AND CMOS TS555 COMPATIBLE WITH TTL,CMOS AND LOGIC MOS
N DIP8
(Plastic Package)
D SO8
(Plastic Micropackage)
DESCRIPTION The TS3V555 with its low consumption (90A at VCC = 3V) is a single CMOS timer dedicated to 3.3V or battery supply (specified at 3V and 5V) offering also a high frequency (f(max) 2MHz at VCC = 3V and 2.7 MHz at VCC = 5V). Thus, either in monostable or astable mode, timing remains very accurate. Timing capacitors can also be minimized due to high input impedance (1012 ). PIN CONNECTIONS (top view)
ORDER CODES
Part Number TS3V555I Temperature Range -40, +125 C
o
Package N
q
D
q
GND Trigger Output Reset
1 2 3 4
8 7 6 5
VCC Discharge Threshold Control Voltage
October 1997
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TS3V555
BLOCK DIAGRAM
VCC 8 Reset 4 3V555 R R1 Threshold 6 Control Voltage 5 R + Trigger 2 R 7 Discharge 1 Ground B + R A S Q 3 Output
FUNCTION TABLE
RESET Low High High High TRIGGER x Low High High THRESHOLD x x High Low OUTPUT Low 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 Supply Voltage Junction Temperature Value +18 +150 Unit V
o
C
THERMAL CHARACTERISTICS
Symbol Toper Tstg Parameter Operating Temperature Range TS3V555I,AI Storage Temperature Range Value -40 to +125 -65 to +150
o
Unit
o
C C
OPERATING CONDITIONS
Symbol VCC Supply Voltage Parameter Value +2.7 to +16 Unit V
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TS3V555
ELECTRICAL CHARACTERISTICS VCC = +3V , Tamb = +25oC , Reset to VCC (unless otherwise specified) STATIC
Symbol ICC Parameter Supply Current - (no load, High and Low States) o Tamb = +25 C Tmin. Tamb Tmax. Control Voltage o Tamb = +25 C Tmin. Tamb Tmax. Discharge Saturation Voltage (IDIS = 1mA) o Tamb = +25 C Tmin. Tamb Tmax. Low Level Output Voltage (ISINK = 1mA) o Tamb = +25 C Tmin. Tamb Tmax. High Level Output Voltage (ISOURCE = -0.3mA) o Tamb = +25 C Tmin. Tamb Tmax. Trigger Voltage o Tamb = +25 C Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tamb = +25C Tmin. Tamb Tmax. Reset Current Discharge Pin Leakage Current 0.4 0.3 2.5 2.5 0.9 0.8 1.8 1.7 TS3V555I Min. Typ. 90 Max. 230 230 2.2 2.3 V 0.05 0.1 0.2 0.25 V 0.3 0.35 V 2.9 V 1 10 10 1.1 10 1 100 1.5 2.0 pA nA 1.1 1.2 pA pA V Unit
A
V
VCL
2
VDIS
VOL
VOH
VTRIG
ITRIG ITH VRESET
IRESET IDIS
DYNAMIC
Symbol Parameter Timing Accuracy (Monostable) R = 10k , C = 0.1F - (note 1) Timing Shift with supply voltage variations (Monostable) R = 10k , C = 0.1F, V CC = +3V +/-0.3V - (note 1) Timing Shift with temperature - (note 1) Tmin. Tamb Tmax. fmax Maximum astable frequency - (note 2) R A = 470 , RB = 200, C = 200pF Astable frequency accuracy - (note 2) R A = RB = 1k to 100k, C = 0.1F Timing Shift with supply voltage variations (Astable mode) - (note 2) R A = RB = 10k, C = 0.1F, VCC = +3 to+5V tr tf tPD tRPW
Note :
TS3V555I Min. Typ. 1 Max.
Unit % %/V
0.5 ppm/C 75 MHz 2 % 5 %/V 0.5 25 20 100 350 ns ns ns ns
Output Rise Time (CLOAD = 10pF) Output Fall Time (CLOAD = 10pF) Trigger Propagation Delay Minimum Reset Pulse Width (VTRIG = +3V)
1. See Figure 2 2. See Figure 4
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TS3V555
ELECTRICAL CHARACTERISTICS VCC = +5V , Tamb = +25oC , Reset to VCC (unless otherwise specified) STATIC
Symbol ICC Parameter Supply Current - (no load, High and Low States) Tamb = +25C Tmin. Tamb Tmax. Control Voltage Tamb = +25C Tmin. Tamb Tmax. Discharge Saturation Voltage (IDIS = 10mA) Tamb = +25C Tmin. Tamb Tmax. Low Level Output Voltage (ISINK = 8mA) Tamb = +25C Tmin. Tamb Tmax. High Level Output Voltage (ISOURCE = -2mA) Tamb = +25C Tmin. Tamb Tmax. Trigger Voltage Tamb = +25C Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tamb = +25C 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 TS3V555I 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
DYNAMIC
Symbol Parameter Timing Accuracy (Monostable) - (note1) R = 10k , C = 0.1F - (note 1) Timing Shift with supply voltage variations (Monostable) - (note1) R = 10k , C = 0.1F, V CC = +5V +/-1V Timing Shift with temperature - (note1) Tmin . Tamb Tmax. fmax Maximum astable frequency - (note 2) R A = 470 , RB = 200, C = 200pF Astable frequency accuracy - (note 2) R A = RB = 1k to 100k, C = 0.1F Timing Shift with supply voltage variations (Astable mode) - (note 2) R A = RB = 10k, C = 0.1F, VCC = +5V to+12V tr tf tPD tRPW
Note :
TS3V555I Min. Typ. 2 Max.
Unit % %/V
0.38 ppm/C 75 MHz 2.7 % 3 %/V 0.1 25 20 100 350 ns ns ns ns
Output Rise Time (CLOAD = 10pF) Output Fall Time (CLOAD = 10pF) Trigger Propagation Delay Minimum Reset Pulse Width (VTRIG = +5V)
1. See Figure 2 2. See Figure 4
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TS3V555
TYPICAL CHARACTERISTICS 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
t = 0.1 ms / div
7
Figure 1 :
300
SUPPLY CURRENT, I CC ( A)
Supply Current (each timer) versus supply voltage.
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
VCC Reset R 4 Trigger 2 8
INPUT = 2.0V/div
TS3V555
Out 3 1
6
C
5 Control Voltage 0.01F
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 2.0V/div R = 9.1k , C = 0.01 F , RL = 1.0k
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TS3V555
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 an 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 mode of operation. Figure 4
VCC Reset RA 4 Out 3 8 7
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 :
f=
1 1.44 = T (RA + 2RB) C
RB
RA + 2RB
The duty cycle is given by : D = Figure 5
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
TS3V555
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
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TS3V555
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
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DIP8.TBL
PM-DIP8.EPS
TS3V555
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
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 license 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 noti ce. 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.
ORDER CODE :
(c) 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOM SON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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SO8.TBL
PM-SO8.EPS

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