Philips Semiconductors Linear Products |
Product specification |
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General purpose CMOS timer |
ICM7555 |
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The ICM7555 is a CMOS timer providing significantly improved performance over the standard NE/SE555 timer, while at the same time being a direct replacement for those devices in most applications. Improved parameters include low supply current, wide
operating supply voltage range, low THRESHOLD, TRIGGER, and
RESET currents, no crowbarring of the supply current during output transitions, higher frequency performance and no requirement to decouple CONTROL VOLTAGE for stable operation.
The ICM7555 is a stable controller capable of producing accurate time delays or frequencies.
In the one-shot mode, the pulse width of each circuit is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free-running frequency and the duty cycle are both accurately controlled by two external resistors and one capacitor. Unlike the bipolar 555 device, the CONTROL
VOLTAGE terminal need not be decoupled with a capacitor. The TRIGGER and RESET inputs are active low. The output inverter can source or sink currents large enough to drive TTL loads or provide minimal offsets to drive CMOS loads.
D and N Packages
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GND |
1 |
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8 |
VDD |
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TRIGGER |
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2 |
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7 |
DISCHARGE |
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OUTPUT |
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3 |
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6 |
THRESHOLD |
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RESET |
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4 |
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5 |
CONTROL VOLTAGE |
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•Timing from microseconds through hours
•Operates in both astable and monostable modes
•Adjustable duty cycle
•High output source/sink driver can drive TTL/CMOS
•Typical temperature stability of 0.005%/oC at 25°C
•Rail-to-rail outputs
•Exact equivalent in most applications for NE/SE555
•Low supply current: 80μA (typ)
•Extremely low trigger, threshold, and reset currents: 20pA (typ)
•High-speed operation: 500kHz guaranteed
•Wide operating supply voltage range guaranteed 3 to 16V over full automotive temperatures
•Normal reset function; no crowbarring of supply during output transition
•Can be used with higher-impedance timing elements than the bipolar 555 for longer time constants
•Precision timing
•Pulse generation
•Sequential timing
•Time delay generation
•Pulse width modulation
•Pulse position modulation
•Missing pulse detector
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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8-Pin Plastic Dual In-Line Package (DIP) |
0 to +70°C |
ICM7555CN |
0404B |
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8-Pin Plastic Small Outline (SO) Package |
0 to +70°C |
ICM7555CD |
0174C |
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8-Pin Plastic Dual In-Line Package (DIP) |
-40 to +85°C |
ICM7555IN |
0404B |
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8-Pin Plastic Small Outline (SO) Package |
-40 to +85°C |
ICM7555ID |
0174C |
August 31, 1994 |
337 |
853-1192 13721 |
Philips Semiconductors Linear Products |
Product specification |
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General purpose CMOS timer |
ICM7555 |
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VDD |
FLIP±FLOP |
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RESET |
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8 |
4 |
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R |
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COMPARATOR |
OUTPUT |
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6 |
A |
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THRESHOLD |
DRIVERS |
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+ |
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3 |
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OUTPUT |
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CONTROL 5 |
± |
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VOLTAGE |
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R |
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DISCHARGE |
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COMPARATOR |
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7 |
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+ |
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2 |
± |
N |
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TRIGGER |
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R |
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1 |
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1 |
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NOTE: |
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UNUSED INPUTS SHOULD BE CONNECTED TO APPROPRIATE VOLTAGE FROM TRUTH TABLE. |
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THRESHOLD VOLTAGE |
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TRIGGER |
VOLTAGE |
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RESET |
1 |
OUTPUT |
DISCHARGE SWITCH |
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DON'T CARE |
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DON'T CARE |
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LOW |
LOW |
ON |
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>2/3(V+) |
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> 1/3(V+) |
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HIGH |
LOW |
ON |
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VTH < 2/3 |
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VTR > 1/3 |
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HIGH |
STABLE |
STABLE |
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DON'T CARE |
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<1/3(V+) |
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HIGH |
HIGH |
OFF |
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NOTES: |
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1. RESET will dominate all other inputs: TRIGGER will dominate over THRESHOLD.
SYMBOL |
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PARAMETER |
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RATING |
UNITS |
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VDD |
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Supply voltage |
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+18 |
V |
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VTRIG1 |
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input voltage |
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Trigger |
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VCV |
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Control voltage |
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> -0.3 to |
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VTH |
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Threshold input voltage |
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<VDD + 0.3 |
V |
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VRST |
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input voltage |
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RESET |
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IOUT |
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Output current |
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100 |
mA |
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P |
° |
2 |
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DMAX |
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Maximum power dissipation, TA = 25 C (still air) |
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N package |
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1160 |
mW |
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D package |
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780 |
mW |
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TSTG |
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Storage temperature range |
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-65 to +150 |
°C |
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TSOLD |
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Lead temperature (Soldering 60s) |
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300 |
°C |
NOTES:
1.Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater than
VDD + 0.3V or less than GND -0.3V may cause destructive latch-up. For this reason it is recommended that no inputs from external sources not operating from the same power supply be applied to the device before its power supply is established. In multiple systems, the supply of the ICM7555 must be turned on first.
2.Derate above 25°C, at the following rates:
N package at 9.3mW/°C
D package at 6.2mW/°C
3. See ªPower Dissipation Considerationsº section.
August 31, 1994 |
338 |
Philips Semiconductors Linear Products |
Product specification |
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General purpose CMOS timer |
ICM7555 |
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TA = 25°C unless otherwise specified.
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LIMITS |
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SYMBOL |
PARAMETER |
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TEST CONDITIONS |
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ICM7555 |
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UNITS |
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MIN |
TYP |
MAX |
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VDD |
Supply voltage |
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TMIN < TA < TMAX |
3 |
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16 |
V |
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IDD |
Supply current1 |
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VDD = VMIN |
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50 |
200 |
μA |
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μA |
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VDD = VMAX |
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180 |
300 |
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Astable mode timing2 |
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μ |
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RA, RB = 1k to 100k, C = 0.1 F |
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5V <VDD <15V |
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Initial accuracy |
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1.0 |
5.0 |
% |
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Drift with supply voltage |
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0.1 |
3.0 |
%/V |
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Drift with temperature3 |
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VDD = 5V |
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50 |
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ppm/oC |
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VDD = 10V |
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75 |
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ppm/oC |
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VDD = 15V |
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100 |
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ppm/oC |
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VTH |
Threshold voltage |
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VDD = 5V |
0.63 |
0.65 |
0.67 |
xVDD |
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VTRIG |
Trigger voltage |
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VDD = 5V |
0.29 |
0.31 |
0.34 |
xVDD |
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VDD = VTRIG = VMAX |
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50 |
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pA |
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ITRIG |
Trigger current |
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VDD = VTRIG = 5V |
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10 |
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pA |
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VDD = VTRIG = VMIN |
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1 |
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pA |
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VDD = VTH = VMAX |
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50 |
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pA |
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ITH |
Threshold current |
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VDD = VTH = 5V |
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10 |
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pA |
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VDD = VTH = VMIN |
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1 |
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pA |
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VDD = VRST = VMAX |
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100 |
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pA |
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IRST |
Reset current |
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VDD = VRST = 5V |
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20 |
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pA |
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VDD = VRST = VMIN |
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2 |
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pA |
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VRST |
Reset voltage |
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VDD = VMIN and VMAX |
0.4 |
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0.7 |
1.0 |
V |
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VCV |
Control voltage |
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VDD = 5V |
0.62 |
0.65 |
0.67 |
xVDD |
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VOL |
Output voltage (low) |
VDD = VMAX, ISINK = 3.2mA |
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0.1 |
0.4 |
V |
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VDD = 5V, ISINK = 3.2mA |
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0.2 |
0.4 |
V |
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VOH |
Output voltage (high) |
VDD = VMAX, ISOURCE = -1.0mA |
15.25 |
15.7 |
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VDD |
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VDD = 5V, |
ISOURCE = -1.0mA |
4.0 |
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4.5 |
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VDD |
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VDIS |
Discharge output voltage |
VDD = 5V, IDIS = 10.0mA |
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0.2 |
0.4 |
V |
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Rise time of output3 |
RL = 10MΩ, CL = 10pF, VDD = |
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t |
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5V |
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45 |
75 |
ns |
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R |
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Fall time of output3 |
RL = 10MΩ, CL = 10pF, VDD = |
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t |
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5V |
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20 |
75 |
ns |
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F |
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FMAX |
Maximum oscillator frequency |
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500 |
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kHz |
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(astable mode) |
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