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ICM7556IPDZ Datasheet(PDF) 5 Page - Intersil Corporation |
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ICM7556IPDZ Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 12 page 5 FN2867.9 August 24, 2006 Schematic Diagram Application Information General The ICM7555 and ICM7556 devices are, in most instances, direct replacements for the NE/SE 555/6 devices. However, it is possible to effect economies in the external component count using the ICM7555 and ICM7556. Because the bipolar NE/SE 555/6 devices produce large crowbar currents in the output driver, it is necessary to decouple the power supply lines with a good capacitor close to the device. The ICM7555 and ICM7556 devices produce no such transients. See Figure 1. The ICM7555 and ICM7556 produce supply current spikes of only 2mA - 3mA instead of 300mA - 400mA and supply decoupling is normally not necessary. Also, in most instances, the CONTROL VOLTAGE decoupling capacitors are not required since the input impedance of the CMOS comparators on chip are very high. Thus, for many applications, two capacitors can be saved using an ICM7555 and three capacitors with an ICM7556. POWER SUPPLY CONSIDERATIONS Although the supply current consumed by the ICM7555 and ICM7556 devices is very low, the total system supply current can be high unless the timing components are high impedance. Therefore, use high values for R and low values for C in Figures 2A, 2B, and 3. RESET DISCHARGE TRIGGER THRESHOLD GND OUTPUT CONTROL VOLTAGE R NN NPN P R R VDD N N N N N P P N N P P P R = 100k Ω ±20% (TYP) TIME (ns) 400 800 600 200 0 0 100 200 300 400 500 SE/NE555 TA = 25°C ICM7555/56 FIGURE 1. SUPPLY CURRENT TRANSIENT COMPARED WITH A STANDARD BIPOLAR 555 DURING AN OUTPUT TRANSITION GND TRIGGER RESET 1 2 3 4 8 7 6 5 VDD DISCHARGE THRESHOLD CONTROL VOLTAGE VDD 10K OPTIONAL CAPACITOR C VDD R FIGURE 2A. ASTABLE OPERATION ICM7555, ICM7556 |
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