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M-8870-01SMTR Datasheet(PDF) 7 Page - Clare, Inc.

Part No. M-8870-01SMTR
Description  DTMF Receiver
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Maker  CLARE [Clare, Inc.]
Homepage  http://www.clare.com
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 7 page
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M-8870
www.clare.com
7
Rev. 3
Timing Diagram
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
VIN
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 guardtime, thus constituting a valid signal.
OE
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 dropout 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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