MT8888C

Data Sheet

21

Zarlink Semiconductor Inc.

† Characteristics are over recommended operating conditions unless otherwise stated

‡ Typical figures are at 25

Notes:

1.

dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.

2.

Digit sequence consists of all 16 DTMF tones.

3.

Tone duration=40 ms. Tone pause=40 ms.

4.

Nominal DTMF frequencies are used.

5.

Both tones in the composite signal have an equal amplitude.

6.

The tone pair is deviated by

± 1.5%±2 Hz.

7.

Bandwidth limited (3 kHz) Gaussian noise.

8.

The precise dial tone frequencies are 350 and 440 Hz (

±2%).

9.

Guaranteed by design and characterization. Not subject to production testing.

10.

Referenced to the lowest amplitude tone in the DTMF signal.

11.

For guard time calculation purposes.

Figure 18 - RD/WR Clock Pulse

Figure 19 - 8031/8051/8085 Read Timing Diagram

Figure 20 - 8031/8051/8085 Write Timing Diagram

13

Output Capacitance (IRQ/CP)

5pF

Characteristics

Sym.

Min.

Max.

Units

Conditions

RD/WR

RD

CS, RS0

DATA BUS

WR

CS, RS0

DATA BUS