βU14204

The βU14204 is a quad analogue input interface integrated circuit for programmable controllers, made by IPRS Băneasa [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) lists the βU14204, marked as preliminary data, as a monolithic integrated circuit meant as the analogue input (or output) interface of programmable controllers (for example the βP 14000 series) [1]. It has four identical channels that can process AC or DC input signals, with a transconductance threshold comparator working in two quadrants, a single serial external resistor to match the IC input to the signal, a low-pass filter with a pin for an external capacitor, an open-collector output and a 3-state common input for testing the interfaces during operation, which can force all 4 channels ON or OFF simultaneously [1].

The catalog gives a supply voltage of 8…40 V, a typical supply current of 7 mA, a typical output current (ON state) of 50 mA, an output voltage (OFF state) of at most 44 V, a typical zener reference voltage of 6 V, a typical input threshold current of 145 µA and a typical input hysteresis of 35 µA [1]. Pins (MP-117, top view): 1 output 1, 2 GND, 3 input 1, 4 comp. 1, 5 VREF, 6 comp. 2, 7 output 2, 8 input 2, 9 output 3, 10 input 3, 11 comp. 3, 12 V+, 13 comp. 4, 14 input 4, 15 TEST input, 16 output 4 [1]. The block diagram with the function table and an application (R1…R4 = Vin max/0.3 mA, C1…C4 = 0.1 µF/ms × Tdelay) are in the Gallery [1].