MT88E45 Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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MT88E45

4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)

Zarlink Semiconductor Inc 

MT88E45

Data Sheet

Oscillator

The MT88E45B requires a 3.579545 MHz crystal or ceramic resonator to generate its oscillator clock. To meet the

CAS detection frequency tolerance specifications the crystal or resonator must have a 0.1% frequency tolerance.

The crystal specification is as follows: (e.g., CTS MP036S)

Frequency:

Frequency Tolerance:

Resonance Mode:

Load Capacitance:

Maximum Series

Resistance:

Maximum Drive Level:

3.579545 MHz

± 0.1% (over temperature

range of the application)

Parallel

18 pF

150 Ω

2 mW

Alternatively an external clock source can be used. In which case the OSC1 pin should be driven directly from a

CMOS buffer and the OSC2 pin left open.

For 5V+/-10% applications any number of MT88E45B’s can be connected as shown in Figure 6 6 so that only one

crystal is required.

MT88E45B

OSC1 OSC2

MT88E45B

OSC1 OSC2

MT88E45B

OSC1 OSC2

to the

next MT88E45B

3.579545 MHz

(For 5V+/-10% applications only)

Figure 6 - Common Crystal Connection

14

Zarlink Semiconductor Inc.

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