Ok, this is my very first question here so please forgive me if I'm asking a too broad question or if my problem description is too imprecise.
I have a 13.56 MHz (RFID) pierce-type quartz oscillator from which I have to derive a burst packet of exactly 136 periods (~10us burst length). There is a trigger signal (TRIG) available to trigger this 10us burst. [Edit1: TRIG is fed to a 74LVC1G126 buffer driver which enables/disables the burst]
The problem: I need to do it cheap (<10 cents @ 10kpcs) and space constrained (somewhere below 40mm^2). So a microcontroller is not an option. RC timing is also not an option considering the required temperature range from -20°C to +70°C.
I think I need some type of discrete, synchronous counting circuit.
My first idea was to use a SN74LV161ADGVR type counter which is available in a 6.4x3.6(TVSOP16) housing, but it has only 4 bits and 6.4x3.6mm already scratches at my space constraints.
Do you have any idea how to achieve such a tiny,cheap burst controller/counter fed by a crystal oscillator?