CM8870CPI datasheet(4/8 Pages) CALMIRCO

Part #	CM8870CPI

Description	CMOS Integrated DTMF Receiver

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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4 / 8 page

9/28/2000

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

4

CALIFORNIA MICRO DEVICES

CM8870/70C

Explanation of Events

A)

Tone bursts detected, tone duration invalid, outputs not

updated.

B)

Tone #n detected, tone duration valid, tone decoded

and latched in outputs.

C)

End of tone #n detected, tone absent duration valid,

outputs remain latched until next valid tone.

D)

Outputs switched to high impedance state.

E)

Tone #n + 1 detected, tone duration valid, tone decoded

and latched in outputs (currently high impedance).

F)

Acceptable dropout of tone #n + 1, tone absent duration

invalid, outputs remain latched.

G) End of tone #n + 1 detected, tone absent duration valid,

outputs remain latched until next valid tone.

Explanation of Symbols

V

IN

DTMF composite input signal.

ESt

Early Steering Output. Indicates detection

of valid tone frequencies.

St/GT

Steering input/guard time output. Drives

external RC timing circuit.

Q1-Q4

4-bit decoded tone output.

StD

Delayed Steering Output. Indicates that

valid frequencies have been present/absent

for the required guard time, thus constituting

a valid signal.

TOE

Tone Output Enable (input). A low level

shifts Q1-Q4 to its high impedance state.

t

REC

Maximum DTMF signal duration not

detected as valid.

t

REC

Minimum DTMF signal duration required

for valid recognition.

t

ID

Minimum time between valid DTMF signals.

t

DO

Maximum allowable drop-out during valid

DTMF signal.

t

DP

Time to detect the presence of valid

DTMF signals.

t

DA

Time to detect the absence of valid

DTMF signals.

t

GTP

Guard time, tone present.

t

GTA

Guard time, tone absent.

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