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M-8888 Datasheet, PDF (9/14 Pages) Clare, Inc. – DTMF Transceiver
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M-8888
AC Characteristics
Parameter
Receive signal conditions
Valid input signal levels
(each tone of composite signal; Notes 1, 2, 3, 5, 6, 9)
Positive twist accept (Notes 2, 3, 6, 9)
Negative twist accept (Notes 2, 3, 6, 9)
Frequency deviation accept (Notes 2, 3, 5, 9)
Frequency deviation reject (Notes 2, 3, 5)
Third tone tolerance (Notes 2, 3, 4, 5, 9, 10)
Noise tolerance (Notes 2, 3, 4, 5, 7, 9, 10)
Dial tone tolerance (Notes 2, 3, 4, 5, 8, 9, 11)
Call progress
Lower frequency (@ -25 dBm) accept
Upper frequency (@ -25 dBm) accept
Lower frequency (@ -25 dBm) reject
Upper frequency (@ -25 dBm) reject
Receive timing
Tone present detect time
Tone absent detect time
Tone duration accept (the Timing Diagrams on page 10)
Tone duration reject (the Timing Diagrams on page 10)
Interdigit pause accept (the Timing Diagrams on page 10)
Interdigit pause reject (the Timing Diagrams on page 10)
Delay St to b3
Delay St to RXO-RX3
Transmit timing
Tone burst duration (DTMF mode)
Tone pause duration (DTMF mode)
Tone burst duration (extended, call progress mode)
Tone pause duration (extended, call progress mode)
Tone output
High group output level (RL = 10 KΩ)
Low group output level (RL = 10 KΩ)
Pre-emphasis (RL = 10 KΩ)
Output distortion (RL = 10 kΩ, 3.4 KHz bandwidth)
Frequency deviation (f = 3.5795 MHz)
Output load resistance
Microprocessor interface
RD, WR low pulse width
RD, WR high pulse width
RD, WR rise and fall time
Address hold time
Address setup time
Data hold time (read)
RD to valid data delay (200 pF load)
Data setup time (write)
Data hold time (write)
Input capacitance, D0-D3
Output capacitance, IRQ /CP
Symbol
Min
Typ*
-
-29
-
-
27.5
-
-
-
-
-
-
-
-
± 1.5% ± 2 Hz
-
-
± 3.5%
-
-
-
-16
-
-
-12
-
-
+22
fLA
-
320
fHA
-
510
fLR
-
290
fHR
-
540
tDP
5
11
tDA
0.5
4
tREC
-
-
tREC
20
-
tID
-
-
tDO
20
-
tPStb3
-
13
tPStRX
-
8
tBST
50
-
tPS
50
-
tBSTE
100
-
tPSE
100
-
VHOUT
-6.1
-
VLOUT
-8.1
-
dBP
0
2
THD
-
-25
fD
-
± 0.7
RLT
10
-
tCL
200
-
tCH
180
-
tR, tF
-
-
tAH
10
-
tAS
23
-
tDHR
22
-
tDDR
-
-
tDSW
45
-
tDHW
10
-
CIN
-
5
C/OUT
-
5
Max
+1
869
6
6
-
-
-
-
-
-
-
-
-
14
8.5
40
-
40
-
-
-
52
52
104
104
-2.1
-4.1
3
-
± 1.5
50
-
-
25
-
-
-
150
-
-
-
-
Units
dBm
mVRMS
dB
dB
Nom.
Nom.
dB
dB
dB
Hz
Hz
Hz
Hz
ms
ms
ms
ms
ms
ms
µs
µs
ms
ms
ms
ms
dBm
dBm
dB
dB
%
kΩ
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
Rev. 1
www.clare.com
9
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