M58478P MITSUBISHI | Alldatasheet

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Technical content

17-STAGE OSCILLATOR/DIVIDER GENERAL DESCRIPTION The M58478P is a frequency divider manufactured by PIN CONFIGURATION (TOP VIEW) aluminum CMOS technology. It produces a frequency of 1/59719 or 1/88672 of the input frequency (3.68MHz to 60Hz or 4.43MHz to 50H2).

FEATURES

© Makes possible a crystal oscillator circuit e Console of handling small-amplitude input signals as low ne our of Kove as ase .3V er z ap © Frequency-dividing ratio selected through terminal N me “ EY g Plvtener SR © Reset function ole N-B] 3 Bosc our Sift. 4 8 @ Produces a shaped ‘waveform output of the same eset RESET +[4] [EJeoscin Sty, frequency as the input signal or oscillation output iy © Derives a vertical scanning frequency from TV color subcarrier

APPLICATIONS

© Frequency divider for VTR SUMMARY OF FUNCTIONS ‘The M58476P has a programmable counter consisting of a Outline 8P1 17-stage binary frequency divider, which delivers 60Hz or 50Hz output from an input of 3.58MHz or 4.43MHz, depending on the state of terminal N. BLOCK DIAGRAM Cf cx oso ovr ail On BEE, | ' “ERB remeron | anes reser INPUT RESET(@) vss (ov) Le

9 MITSUBISHI

ELECTRIC 10—15

17-STAGE OSCILLATOR/DIVIDER FUNCTIONAL DESCRIPTION Fig. 1 Waveform of divided-frequency output Crystal Oscillator 4 ih): A crystal oscillator is obtained by connecting a quartz ‘When input N is open (high): resonator element between terminals OSC IN and OSC out ae FE OUT, and capacitances C,, and Cyo between the two wee saree counts -«l terminals and Vs. (A feedback resistor is contained UPPED 26985 COUNTS on-chip.) An amplifier is contained in terminal OSC IN, allowing even a small amplitude signal to be input via the When input N is low: coupling capacitor Ce. our When the input N is open (high), the frequency-dividing SUbREED atio is set at 69719, producing a GOHz output from & 16+. The frequency-dvidng ratio in the following cycle is decided by 3.58MHz input. When N is low, the ratio is 88672, the state input N just before the output OUT turns from high to producing 50Hz from 4.43MHz input. Figure 1 shows the low waveform of the divided frequency output. Shaped-waveform output of the same frequency as the input signal or oscillation frequency is produced on the TUNER output. Reset Function When the RESET input is changed from high to low (edge trigger reset of the active. low), the output OUT turns low. Pull-up Resistance There is a pull-up resistor in both terminals N and RESET, eliminating the need for any external resistor, Resistance of the standard pull-up resistor is 20k. Frequency Dividing Ratio The frequency-dividing ratio is determined by the data contents of the programmable counter. Change of the Frequency-Dividing Ratio Different frequency-dividing ratios are available. Any frequency-dividing ratio from 5 to 131071 (—2'7—1) can be provided by changing the data input to the program- mable counter. ee SSSSSSSSSSSSSFSSSeSeSSSeSSee fe MiTsusisi 10-16 ELECTRIC

17-STAGE OSCILLATOR/DIVIDER ABSOLUTE MAXIMUM RATINGS a mewmesenss vas visvo0 v [Pd | Maumum power dissipation Ta=25e 250 aw Operating Wee-ai temperature range =30~76 cd RECOMMENDED OPERATING CONDITIONS (Ta ~ -30~ 70°C. unless otherwise noted) oe coe a [wie [rom [ M_| Lowimel pat ote re ee [vi esototon nevi aroinae wings tO || Input frequency. with the terminal Nin high-level [| 3.58 | [MHz | Input frequency. with the terminal N in low-level [fea [ss | waz | few [ee ee eee | | Voo | Sreawoiamvonee ST Ta OCP] | too | Suowewren RESET rowtinn mn TT ma [on [Wore outers oma Lowel outout curent ~ | Yo=Voo __ mA Ri Pull-up resistance. N and RESET inputs - J _ ko [ax [oem ooomine reason vn 15 ss Pe ELECTRIC 10—17

17-STAGE OSCILLATOR/DIVIDER TYPICAL APPLICATION CIRCUIT Crystal Oscillator (with Built-In Feedback Resistance) O 4.75~8.5v Voo 5) 08c IN XTAL ‘M58478P_ out} IIS osc our Cu, CLO} Vss ~600F 10 ~SOpF 2

7 GND

External input Signal Connections & 4.75-8.5v Voo INPUT SIGNAL O44 ose in s8478P ourf 1000pF Vss No Ee he MiTSuBistH 10-18 ELECTRIC