MT8888C Datasheet, PDF(15/25 Page) Mitel Networks Corporation – Integrated DTMFTransceiver with Intel Micro Interface

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MT8888C Datasheet, PDF (15/25 Pages) Mitel Networks Corporation – Integrated DTMFTransceiver with Intel Micro Interface

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MT8888C

Data Sheet

8031/8051

8080/8085

A8-A15

MT8888C

RS0

D0-D3

Figure 14 - MT8888C Interface Connections for Various Intel Micros

DTMF/CP

INPUT

DTMF

OUTPUT

Notes:

R1, R2 = 100 kâ¦ 1%

R3 = 374 kâ¦ 1%

R4 = 3.3 kâ¦ 10%

R5 = 4.7 Mâ¦ 10%

RL = 10 k â¦ (min.)

C1 = 100 nF 5%

C2 = 100 nF 5%

C3 = 100 nF 10%*

C4 = 10 nF 10%

X-tal = 3.579545 MHz

X-tal

MT8880C

IN+

VDD

IN-

St/GT

VRef

ESt

VSS

OSC1

OSC2

TONE

IRQ/CP

RS0

VDD

To ÂµP

or ÂµC

* Microprocessor based systems can inject undesirable noise into the supply rails.

The performance of the MT8888C can be optimized by keeping

noise on the supply rails to a minimum. The decoupling capacitor (C3) should be

connected close to the device and ground loops should be avoided.

Figure 15 - Application Circuit (Single-Ended Input)

Zarlink Semiconductor Inc.

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