EM91450 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE
AND I.P.P. DETECT FUNCTION
AC ELECTRICAL CHARACTERISTIC
(Ambient temperature is 25
o
C, V
DD
=2.5V unless otherwise noted, all voltages referenced to Vss,Fosc=3.579545 MHz)
Parameter
Keyboard debounce time
Key tone signal: frequency
duration
Pause time
Pulse to Tone waiting time
Flash time
Sym.
Tdb
Fkt
Tkt
Tp
Tpt
Tf
Min.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
96
96
-
3.8
-
Typ.
20
600
30
3.6
3.6
600
100
80
300
20
10
40:60
33:66
800
500
98
98
93
3.9
300
Max. Unit
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100
100
-
4.1
-
ms
Hz
ms
sec.
sec.
ms
Condition
Pulse rate
Make/Break ratio
Inter-digit pause time
Minimum tone duration
Minimum inter-tone pause
HD key release hold function
debounce time
SDO bit time
Off-Hook delay time
PSR
MBR
Tidp
Tp
Titp
Thdrdb
Tbit
Tdly
pps
%
ms
Row3B, Row4B=NR, NR
Row3B, Row4B=NR, R-Vss
Row3B,Row4B=R-Vss, NR
Row3B,Row4B=R-Vss,R-Vss
Row1 = R-Vdd
Row1 = R-Vss
Row2 = NR
Row2 = R-Vss
PSR = 10 pps
PSR = 20 pps
Memory dialing
ms
ms
ms
ms
DTMF output frequency
(fosc = 3.579545 MHz)
Keyboard scan pin
ROW1 (f1)
ROW2 (f2)
ROW3 (f3)
ROW4 (f4)
COL1 (f5)
COL2 (f6)
COL3 (f7)
CCITT standard (Hz)
697
770
852
941
1209
1336
1477
Actual output (Hz)
699.1
766.2
847.4
947.9
1215.8
1331.6
1471.8
Deviation (%)
0.30
0.49
-0.53
0.73
0.56
-0.32
-0.35
* This specification are subject to be changed without notice.
2.10.1999
12
EMC [ ELAN MICROELECTRONICS CORP ]
