@ PLESSEY Semiconductors T-7TT-1) ML926/7 REMOTE CONTROL RECEIVERS (WITH MOMENTARY OUTPUTS) The ML926 and ML927 are MOS LSI monolithic circuits for use as recelvers of remote control signals for television control and many other applications. They are general pur- pose devices each receiving sixteen of the thirty-two codes transmitted by the SL490 circuit as pulse position modu- lation (PPM). FEATURES M Minimum Package Size 8-Lead Minidip M Four Outputs Indicate in Binary the Code Currently Being Received, and Are Switched Off (Low) When No Valid Code is Detected. HM On-Chip Oscillator Mi High Power, Free Drain, Output Buffers OPERATING NOTES The receiver operates on a timescale fixed by an internal oscillator and its external timing components. The oscillator may be adjusted to any value between 15Hz and 150kHz {allowing different receivers to respond to different transmission rates withint the same area). Checks are made to ensure 6 pulses, or 5 bits, are received for a word to be valid, and only after two consecutive and identical words is the receiver allowed to respond to the incoming code. The ML926 responds only to codes 00001 to 01111 from the SL490 transmitter whereas the ML927 responds to codes 10001 to 11111. ABSOLUTE MAXIMUM RATINGS Vop supply and inputs w.r.t. Vss +0.3V to-25V Storage temperature 55C to +125C Operating temperature ambient -10C to + 65C 40 -voo i, 7 ao OSCILLATOR TIME CONSTANT qd 2 ML 7 mc MOMENTAnT peminPuT (3 926]7 cha | sary outputs +vss (4 SpA oP8 Fig.1 Pin connections (top view) Hae TIME INPUT PPM TAMING CONSTANT $| vemon [*-] ceneraron oseiatan ~F-o |. Ly 6 BIT SHIFT -Voo it COMPARATOR 1 6 Bf LATCH LE 5 +Vss | 6 06 b7 68 A 5 C o Fig 2 Block diagram s PPM INPLTS _t1 is 4 S6% 100k. {\s a {]z a } 22n 7le 4} + or* | | | ALL 3k y 9 Yoo vss 16 av Fig. 3 Test circuitELECTRICAL CHARACTERISTICS Test Conditions (unless otherwise stated): T- 7 7- 1 1 Vobp = 16V, Vss = 0V Tamb. = 25C Characteristic Pin : anus Units Conditions Min. Typ. | Max Operating supply voltage range 12 14 18 Vv Current consumption 1-1 2 3 4 mA PPM input Input level high 3 1 0 Vv Input level low 3 Vop 6 Vv 1 Input pulse width 3 22Tosc | psec | T= : osc Oscillator time constant See Note 1 Oscillator frequency 2 15 150k Hz 3k Hz Typical TC: 22nF toVss Variation wrt Voo 1 %IV 100kit0 Voo Output voltage high 5-8 -15 0 Vv R, = 3.0K to VDD Output device leakage (Output OFF)| 5-8 1 HA : . 1 Note 1. Rog, (Pin 2)is 56k-156ka fogg ce 420% ose O.1SCR Momentary binary outputs PIN FUNCTIONS Transmitt POSITIVE LOGIC 1 = Vss, 0 = Vo Code. men ataen 1. Voo 14V to 18V power supply EDCBA DCBA DCBA 2. Oscillator time constant 00000 0000 0000 An RC time constant of a capacitor and resistor at this 00001 0001 pin defines the internal clock frequency. The clock 00010 0010 frequency may be varied from 15Hz to 150kHz. 00011 0011 3. _PPM input ehh The output of the front end amplifier is connected to this 00110 0110 pin; the signal must consist of a normal low level with pulses 00111 o111 to high level corresponding to the PPM pulses from the 010 0 0 1000 transmitter. 01001 1001 4. Vss 01010 1010 OV (ground) 01011 1011 Ha, ABCD gibi | iia Four open drain high power transistors give a binary 01110 11170 coded output of the valid code being received. O14141 1441 10000 0000 0000 10001 0001 10010 0010 470011 0011 10100 0100 10101 0101 10110 0110 10111 0111 11000 1000 11001 1001 11010 69010 11011 1011 141100 1100 11101 1101 11110 1110 111411 11141 Table 1 Response to SL490 codes P- -_