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ICM7555CN Datasheet(PDF) 8 Page - NXP Semiconductors |
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ICM7555CN Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 9 page Philips Semiconductors Linear Products Product specification ICM7555 General purpose CMOS timer August 31, 1994 344 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Free-Running Frequency as a Function of RA, RB, and C Monostable Time Delay vs RA and C 100.0 10.0 1.0 0.1 0.01 0.001 0.0001 0.0 0.1 1.0 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 100.0 10.0 1.0 0.1 0.01 0.001 0.0001 0.0 TIME DELAY 100ns 1ms 10ms 100ms 1s 10s 1 µs 10 µs 100 µs VDD = 5V TA = +25°C VDD = 5V TA = +25°C (RA + 2RB) 1k Ω 10k Ω 100k Ω 1M Ω 10M Ω 1k Ω 10k Ω 100k Ω 1M Ω 10M Ω RA Figure 1. Supply Current Transient Compared With a Standard Bipolar 555 During an Output Transition 500 400 300 200 100 0 0 200 400 600 800 TIME (ns) TA = +25°C NE/SE555 ICM7555 APPLICATION NOTES General The ICM7555 device is, in most instances, a direct replacement for the NE/SE555 device. However, it is possible to effect economies in the external component count using the ICM7555. Because the bipolar 555 device produces 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 7555 device produces no such transients. See Figure 1. The ICM7555 produces supply current spikes of only 2-3mA instead of 300-400mA and supply decoupling is normally not necessary. Secondly, 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, 2 capacitors can be saved using an ICM7555. Power Supply Considerations Although the supply current consumed by the ICM7555 device is very low, the total system supply can be high unless the timing components are high impedance. Therefore, high values for R and low values for C in Figures 2 and 3 are recommended. Output Drive Capability The output driver consists of a CMOS inverter capable of driving most logic families including CMOS and TTL. As such, if driving CMOS, the output swing at all supply voltages will equal the supply voltage. At a supply voltage of 4.5V or more, the ICM7555 will drive at least 2 standard TTL loads. |
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