How to judge the pin order of IC chip

Method of identifying digital IC pins: point the letters and codes on the front of the IC to yourself, and make the positioning mark face to the bottom left, then the pin at the bottom left is the first pin, and then count the pins in turn counterclockwise, that is, the second pin, the third pin, etc.
The pin ordering of some imported IC circuits is reverse. Models of these ICs are followed by the suffix letter "R". If there is no "R" after the model, it is a forward pin, and if there is "R", it is a reverse pin;
For example, m5115 and m5115rp, ha1339a and ha1339ar, ha1366w and ha1366ar. The former is forward pin type, while the latter is reverse pin type. Attention should be paid to identifying the number of pins of this kind of IC.
function
(1) Pin is a multi-function pin. The second audio IF signal under various systems can be demodulated from this pin into the internal FM demodulation circuit in an unbalanced way. At the same time, it is also the control pin for intra block AV \ TV conversion and pal, NTSC and SECAM color system conversion, and the input impedance is about 3.4K.
(2) The pin is the identification output pin, which outputs the image identification signal in the ○ C gate mode. When the TV mode has received the image TV signal, the pin presents a high impedance externally, and the high-level signal can be obtained by external pull-up resistance; When no signal is received, the pin presents low impedance and outputs low level.

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