MX613 datasheet(2/10 Pages) CMLMICRO

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Global Call Progress Tone Detector

MX613

Preliminary Information

Xtal/Clock: The input to the on-chip clock oscillator inverter. A 3.579545MHz Xtal or

externally derived telephone system clock (f

XTAL) should be connected here. Operation

of the MX613 without a suitable Xtal/Clock input may cause device damage.

Xtal: The output of the on-chip clock oscillator inverter. See Figure 2.

No internal connection.

BIAS: The internal circuitry bias line, held at VDD/2 this pin must be decoupled to VSS.

Level In: The input for level discrimination. This input is internally biased to V

BIAS. Signals

must be a.c. coupled, and the audio signal must be fed to both this pin and the Signal In

pin. Correct level detection determines the operation of this device (see Principles of

Decoder Operation). But if you wish to disregard the amplitude of the input levels, the

MX613 may be permanently enabled by pulling this pin to V

DD and disabled by pulling to

SS.

Signal In: The input for frequency discrimination and decoding. This input is internally

biased to V

BIAS. Signals must be a.c. coupled. The audio signal must be fed to both this

pin and the Level In pin.

No internal connection.

SS: Signal ground (GND).

No internal connection.

IRQ: This Interrupt Request output from the MX613 is ‘wire-OR able’ allowing the

interrupt outputs of other peripherals to be combined and connected to the Interrupt input

of aµProcessor. This input has a low-impedance pulldown to V

SS when active and a high-

impedance when inactive. An interrupt is produced on completion of a HI or LO frequency

measurement.

Serial Clock: The serial clock from the

µProcessor. Data Out is clocked into the

µProcessor on the rising edge of the Serial Clock. See Data-Read Timing diagram.

Chip Select: A logic “0” at this input will select this device.

Data Out: The serial data output. Under the control of the Chip Select and Serial Clock

inputs, data should be read from this output in 6-bit blocks MSB (Bit-5) first.

If 8 serial clock pulses are applied, two additional logic “0s” will be output after Bit-0.

No internal connection.

DD: Positive supply input. A single, stable supply is required. Levels and voltages within

the MX613 are dependent upon this supply. This pin should be decoupled to V

SS by a

capacitor located close to the MX613 pins.

Pin Number

Function

MX613DW

MX613P

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