ic555 and bipolar triode is completely different, bipolar triode is composed of two back-to-back PN structure, with current amplification of the crystal triode, on 3 feet.
Bipolar voltage is 5V~ 15V, the maximum output current can reach 200mA, CMOS type power supply voltage is3V to 18V. Figure 8-1 shows the internal block diagram of the 555 circuit.
LMC555 is a low-power CMOS process 555 chip. Unlike traditional bipolar triodes, CMOS chips are made of low-power MOS tubes. By taking a closer look at the picture model, we will understand how it works.
There are two kinds of time base circuits: bipolar and CMOS. The LM555/LM555C series is bipolar. The advantage is that the output power is large, and the driving current is 200mA. Another advantage of CMOS is power consumptionStandard is superior, to replace with CMOS type, such as 7555, the performance indicators are superior. Download this information to find out.
NE555 operating voltage range is 5V~16V, it can not work at 3V voltage. You can replace TLC555, the working voltage range 2~15V, the pin and NE555 are compatible with each other, and the speed can be 10 times faster than NE555, its own power consumption is only one thousandth of NE555, the maximum output current 100mA.
There are two types of NE555 time-base circuit seal, one is dip double-in-line 8-pinPackage, the other is the sop-8 small (smd) package form. Other HA1755NE55LM55UA555G55FX55.. Products produced by different companies. The internal structure and working principle are the same.
If NE555 is damaged, it can be replaced with LM555, BA555, CA555, etc.
TLC555 is a CMOS process, and NE555 is a bipolar structure, of course, it is not as good as the TLC555 performance indicators, to replace the CMOS type, such as 7555, the performance indicators are better. Download this information to find out.
These two are completely interchangeable, but the manufacturer is different, the maximum output current can reach 200ma. Note that it is not possible if it is TLC7555, which is a CMOS time-base circuit with a very small load capacity, only about 1ma. But its static power consumption is very low, very power saving.
Good temperature stability and cheap price. imparityThe operating frequencies of the 555 models are also different, and it is generally believed that the NE555 frequency can reach a maximum of 500KHZ. The LMC555 produced by National Semiconductor company works in the unsteady multistage oscillation mode with a maximum frequency of 3MHz.
pin) and the external trigger voltage of the low trigger terminal TL (pin 2). The discharge end D (pin 7) is connected between R1 and R2. The voltage control terminal K (pin 5) is connected to the high-frequency interference bypass capacitor C2 (0.01uF) without external control voltage. The direct reset terminal R (pin 4) is connected to a high level so that NE555 is inNon-reset state.