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TS556
LOW POWER DUAL CMOS TIMER
s VERY LOW POWER CONSUMPTION : s s s s s s s
220 A typ at VCC = 5V 180 A typ at VCC = 3V HIGH MAXIMUM ASTABLE FREQUENCY 2.7MHz PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE556 WIDE VOLTAGE RANGE : +2V to +16V HIGH OUTPUT CURRENT CAPABILITY SUPPLY CURRENT SPIKES REDUCED DURING OUTPUT TRANSITIONS HIGH INPUT IMPEDANCE : 1012 OUTPUT COMPATIBLE WITH TTL,CMOS AND LOGIC MOS
N DIP14 (Plastic Package)
DESCRIPTION The TS556 is a dual CMOS timer which offers very low consumption (Icc(TYP) TS556 = 220A at VCC=+5V versus Icc(TYP) NE556 = 6mA) and high frequency ff(max.) TS556 = 2.7MHz versus f(max.) NE556 = 0.1 MHz) Thus, either in Monostable or Astable mode, timing remains very accurate. The TS556 provides reduced supply current spikes during output transitions, which enables the use of lower decoupling capacitors compared to those required by bipolar NE556. Timing capacitors can also be minimized due to high input impedance (1012). ORDER CODES
Package Part Number TS556C TS556I TS556M Temperature Range N 0C, +70C -40C, +125C -55C, +125C * * * D * * *
D SO14 (Plastic Micropackage)
PIN CONNECTIONS (top view)
Discharge Threshold Control Voltage Reset Output Trigger GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
+VS Discharge Threshold Control Voltage Reset Output Trigger
N = Dual in Line Package (DIP) D = Small Outline Package (SO) - also available in Tape & Reel (DT)
February 2003
1/11
TS556
BLOCK DIAGRAM
V CC
14
Reset
4 / 10 TS556
R
2 / 12
R1
+
Threshold Control Voltage
Q R
5/9
Output
3 / 11
A S
R
+
Trigger
6/8
-
B
1 / 13
R
7
Discharge
Ground
FUNCTION TABLE
RESET Low High High High TRIGGER x Low High High THRESHOLD x x High Low OUTPUT Low High Low Previous State
LOW <-----> Level Voltage Min voltage specificed HIGH <-----> Level Voltage Max voltage specificed x <-----> Irrelevant ABSOLUTE MAXIMUM RATINGS
Symbol VCC Tj Tstg PD Supply Voltage Junction Temperature Storage Temperature Range Power dissipation
o o
Parameter
Value +18 +150 -65 to +150 DIP14 SO14 1560 830
Unit V C C mW
1)
1. T j = 150C, Tamb = 25 C with Rthja = 80 C/W for DIP14 package Rthja = 150oC/W for SO14 package
OPERATING CONDITIONS
Symbol VCC Toper Supply Voltage Operating Free Air Temperature Range TS556C TS556I TS556M Parameter Value +2 to +16 0 to +70 -40 to +125 -55 to +125 Unit V C
2/11
V CC
R1 10 12 21 20 26 27 31 30 13 11
50k
1
2
R2
SCHEMATIC DIAGRAM (1/2 TS556)
50k R7 25
34
Control Voltage 8 9
Threshold
R3
4 Output Trigger 14 18 23 19 7 24 28 29 32 Discharge 35
50k
R4
50k
R5
5
6
50k
R6 15 16
17 22 33
50k
GND
RESET
TS556
3/11
TS556
STATIC ELECTRICAL CHARACTERISTICS VCC = +2V, Tamb = +25C, Reset to V CC (unless otherwise specified)
Symbol ICC VCL VDIS IDIS VOL VOH VTRIG ITRIG ITH VRESET IRESET Parameter Supply Current (no load, High and Low States) Tmin. Tamb Tmax. Control Voltage Level Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 1mA) Tmin. Tamb Tmax. Discharge Pin Leakage Current Low Level Output Voltage (Isink = 1mA) Tmin. Tamb Tmax. High Level Output Voltage (Isource = -0.3mA) Tmin. Tamb Tmax. Trigger Voltage Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tmin. Tamb Tmax. Reset Current 0.4 0.3 1.5 1.5 0.4 0.3 1.2 1.1 Min. Typ. 130 1.3 0.05 1 0.1 1.9 0.67 10 10 1.1 10 1.5 2.0 0.95 1.05 Max. 400 400 1.4 1.5 0.2 0.25 100 0.3 0.35 Unit A V V nA V V V pA pA V pA
4/11
TS556
ELECTRICAL CHARACTERISTICS VCC = +3V, Tamb = +25C, Reset to VCC (unless otherwise specified)
Symbol ICC VCL VDIS IDIS VOL VOH VTRIG ITRIG ITH VRESET IRESET Parameter Supply Current (no load, High and Low States) Tmin. Tamb Tmax. Control Voltage Level Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 1mA) Tmin. Tamb Tmax. Discharge Pin Leakage Current Low Level Output Voltage (Isink = 1mA) Tmin. Tamb Tmax. High Level Output Voltage (Isource = -0.3mA) Tmin. Tamb Tmax. Trigger Voltage Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tmin. Tamb Tmax. Reset Current 0.4 0.3 2.5 2.5 0.9 0.8 1.8 1.7 Min. Typ. 180 2 0.05 1 0.1 2.9 1 10 10 1.1 10 1.5 2.0 1.1 1.2 Max. 460 460 2.2 2.3 0.2 0.25 100 0.3 0.35 Unit A V V nA V V V pA pA V pA
DYNAMIC ELECTRICAL CHARACTERISTICS VCC = +3V, Tamb = +25C, Reset to VCC (unless otherwise specified)
Symbol Parameter Timing Accuracy (Monostable) 1) R = 10k, C = 0.1F Min. Typ. 1 1 0.5 75 2 5
2)
Max.
Unit
VCC=+2V VCC=+3V
%
Timing Shift with Supply Voltage Variations (Monostable) 1) R = 10k, C = 0.1F,VCC = +3V 0.3V Timing Shift with Temperature Tmin. Tamb Tmax fmax
1)
%/V ppm/C MHz % %/V ns ns ns ns
Maximum Astable Frequency 2) RA = 470, RB = 200, C = 200pF Astable Frequency Accuracy 2) RA =RB = 1k to 100k, C = 0.1F Timing Shift with Supply Voltage Variations (Astable mode) RA =RB = 10k, C = 0.1F, VCC = +3 to +5V
0.5 25 20 100 350
tR tF tPD tRPW
1. 2.
Output Rise Time (Cload = 10pF) Output Fall Time (Cload = 10pF) Trigger Propagation Delay Minimum Reset Pulse Width (Vtrig = +3V)
see figure 2 see figure 4
5/11
TS556
STATIC ELECTRICAL CHARACTERISTICS VCC = +5V, Tamb = +25C, Reset to VCC (unless otherwise specified)
Symbol ICC VCL VDIS IDIS VOL VOH VTRIG ITRIG ITH VRESET IRESET Parameter Supply Current (no load, High and Low States) Tmin. Tamb Tmax. Control Voltage Level Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 10mA) Tmin. Tamb Tmax. Discharge Pin Leakage Current Low Level Output Voltage (Isink = 8mA) Tmin. Tamb Tmax. High Level Output Voltage (Isource = -2mA) Tmin. Tamb Tmax. Trigger Voltage Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tmin. Tamb Tmax. Reset Current 0.4 0.3 4.4 4.4 1.36 1.26 2.9 2.8 Min. Typ. 220 3.3 0.2 1 0.3 4.6 1.67 10 10 1.1 10 1.5 2.0 1.96 2.06 Max. 500 500 3.8 3.9 0.3 0.35 100 0.6 0.8 Unit A V V nA V V V pA pA V pA
DYNAMIC ELECTRICAL CHARACTERISTICS VCC = +5V, Tamb = +25C, Reset to VCC (unless otherwise specified)
Symbol Parameter Timing Accuracy (Monostable) 1) R = 10k, C = 0.1F Timing Shift with Supply Voltage Variations (Monostable) 1) R = 10k, C = 0.1F,VCC = +5V 1V Timing Shift with Temperature 1) Tmin. Tamb Tmax. fmax Maximum Astable Frequency RA = 470, RB = 200, C = 200pF Astable Frequency Accuracy RA =RB = 1k to 100k, C = 0.1F Timing Shift with Supply Voltage Variations (Astable mode) 2) RA =RB = 1k to 100k, C = 0.1F, VCC = +5 to +12V tR tF tPD tRPW
1. 2.
Min.
Typ. 2 0.38 75 2.7 3 0.1 25 20 100 350
Max.
Unit % %/V ppm/C MHz % %/V ns
2)
2)
Output Rise Time (Cload = 10pF) Output Fall Time (Cload = 10pF) Trigger Propagation Delay Minimum Reset Pulse Width (Vtrig = +5V)
-
ns ns ns
see figure 2 see figure 4
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TS556
STATIC ELECTRICAL CHARACTERISTICS VCC = +12V, Tamb = +25C, Reset to V CC (unless otherwise specified)
Symbol ICC VCL VDIS IDIS VOL VOH VTRIG ITRIG ITH VRESET IRESET Parameter Supply Current (no load, High and Low States) Tmin. Tamb Tmax. Control Voltage Level Tmin. Tamb Tmax. Discharge Saturation Voltage (Idis = 80mA) Tmin. Tamb Tmax. Discharge Pin Leakage Current Low Level Output Voltage (Isink = 50mA) Tmin. Tamb Tmax. High Level Output Voltage (Isource = -10mA) Tmin. Tamb Tmax. Trigger Voltage Tmin. Tamb Tmax. Trigger Current Threshold Current Reset Voltage Tmin. Tamb Tmax. Reset Current 0.4 0.3 10.5 10.5 3.2 3.1 7.4 7.3 Min. Typ. 340 8 0.09 1 1.2 11 4 10 10 1.1 10 1.5 2.0 4.8 4.9 Max. 800 800 8.6 8.7 1.6 2.0 100 2 2.8 Unit A V V nA V V V pA pA V pA
DYNAMIC ELECTRICAL CHARACTERISTICS VCC = +12V, Tamb = +25C, Reset to V CC (unless otherwise specified)
Symbol Parameter Timing Accuracy (Monostable) 1) R = 10k, C = 0.1F Timing Shift with Supply Voltage Variations (Monostable) R = 10k, C = 0.1F,VCC = +5V 1V Timing Shift with Temperature Tmin. Tamb Tmax., VCC = +5V fmax Maximum Astable Frequency RA = 470, RB = 200, C = 200pF, VCC = +5V Astable Frequency Accuracy RA =RB = 1k to 100k, C = 0.1F Timing Shift with Supply Voltage Variations (Astable mode) RA =RB = 1k to 100k, C = 0.1F, VCC = 5 to +12V
1. 2. see figure 2 see figure 4
Min.
Typ. 4 0.38 75 2.7 3 0.1
Max.
Unit % %/V ppm/C MHz % %/V
2)
7/11
TS556
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 operates like a one-shot generator. Referring to figure 2, the external capacitor is initially held discharged by a transistor inside the timer.
The circuit triggers on a negative-going input signal when the level reaches 1/3 VCC. 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. 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 = 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
Figure 2 :
V CC Reset R
INPUT = 2.0V/div
Trigger
OUTPUT VOLTAGE = 5.0V/div
1/2 TS556
Out
C
Control Voltage 0.01F
CAPACITOR VOLTAGE = 2.0V/div R = 9.1k , C = 0.01 F , R L = 1.0k
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TS556
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 and 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 4:
V CC Reset RA
Figure 5 shows actual waveforms generated in this 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 x RB x C Thus the total period T is given by : T = t1 + t2 = 0.693 (RA + 2R B) C The frequency of oscillation is then : 1 1.44 f = -- = ------------------------------------T (RA + 2 R B )C The duty cycle is given by :
RB D = --------------------------R A + 2 RB
Figure 5:
t = 0.5 ms / div OUTPUT VOLTAGE = 5.0V/div
Out
1/2 TS556
Control Voltage 0.01 F
RB
C
CAPACITOR VOLTAGE = 1.0V/div R = R = 4.8 k, C = 0.1 F , R L = 1.0k A B
9/11
TS556
PACKAGE MECHANICAL DATA 14 PINS - PLASTIC DIP
Millimeters Dimensions Min. a1 B b b1 D E e e3 F i L Z 0.51 1.39 0.5 0.25 20 8.5 2.54 15.24 7.1 5.1 3.3 1.27 2.54 0.050 Typ. Max. 1.65 Min. 0.020 0.055
Inches Typ. Max. 0.065 0.020 0.010 0.787 0.335 0.100 0.600 0.280 0.201 0.130 0.100
10/11
TS556
PACKAGE MECHANICAL DATA 14 PINS - PLASTIC MICROPACKAGE (SO)
L C G c1
a2 b e3 D M e
A
s E
14 1
8 7 F
Millimeters Dimensions Min. A a1 a2 b b1 C c1 D (1) E e e3 F (1) G L M S 0.1 0.35 0.19 0.5 45 (typ.) 8.55 5.8 1.27 7.62 3.8 4.6 0.5 4.0 5.3 1.27 0.68 8 (max.) 0.150 0.181 0.020 8.75 6.2 0.336 0.228 Typ. Max. 1.75 0.2 1.6 0.46 0.25 Min. 0.004 0.014 0.007
a1
b1
Inches Typ. Max. 0.069 0.008 0.063 0.018 0.010 0.020 0.344 0.244 0.050 0.300 0.157 0.208 0.050 0.027
Note : (1) D and F do not include mold flash or protrusions - Mold flash or protrusions shall not exceed 0.15mm (.066 inc) ONLY FOR DATA BOOK.
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. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2003 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 (c) http://www.st.com
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