EM91215 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
ELECTRICAL CHARACTERISTIC
(Ambient temperature is 25°C, VDD=2.5V unless otherwise noted, all voltages referenced to Vss,Fosc=3.579545 MHz)
Parameter
Sym.
Min.
Typ.
Max. Unit
Condition
Keyboard debounce time
Key tone signal:
Tdb
-
20
-
ms
frequency
Fkt
Tkt
Tp
-
-
-
-
-
-
-
-
-
600
30
-
-
-
-
-
-
-
-
-
Hz
present duration
ms
Pause time and pulse to tone
3.6
2
sec.
sec.
COL2=NR
Tpt
Tf
COL2=R-Vss
Flash time
600
100
80
Row3, Row4=NR, NR
Row3, Row4=NR, R-Vss
Row3, Row4=R-Vss, NR
Row3, Row4=R-Vss,R-Vss
ms
300
300
Flash pause time
Pulse rate
Tfp
ms
PSR
-
20
10
-
pps
Row1 = R-Vdd
Row1 = R-Vss
Row2 = NR
-
-
Make/Break ratio
MBR
Tidp
-
-
-
40:60
33:66
800
500
-
-
%
-
-
Row2 = R-Vss
PSR = 10 pps
PSR = 20 pps
Vdtmf = 0.5 V
Inter-digit pause time
ms
-
-
-
DTMF pin: sink current
DTMF signal DC level
DTMF signal: ac level
pre-emphase
IoL
-0.2
0.5
mA
Vdc
-
0.75
Vdd Vdd = 2.0V ~ 5.5V
Vdtmf 142
160
180 mVrms Row group
Twist
THD
ZL
1
-
2
3
dB
dB
KΩ
Column - Row
RL = 5 KΩ
distortion
-30
-23
load resistance
5
-
-
THD <−23dB
96
88
81
96
98
90
83
98
100
92
85
Minimum tone duration
TD
ms
Memory dialing
Memory dialing
100
Minimum inter-tone pause
SDO every bit time
Titp
Tbit
88
81
3.8
90
83
3.9
92
85
4.1
ms
ms
DTMF output frequency (fosc = 3.579545 MHz)
Keyboard scan pin CCITT standard (Hz)
Actual output (Hz)
699.1
Deviation (%)
ROW1 (f1)
ROW2 (f2)
ROW3 (f3)
ROW4 (f4)
COL1 (f5)
COL2 (f6)
COL3 (f7)
697
770
852
0.30
0.49
-0.53
0.73
0.56
-0.32
-0.35
766.2
847.4
947.9
1215.8
941
1209
1336
1477
1331.6
1471.8
* This specification are subject to be changed without notice.
10.1.1997
9
ELAN [ ELAN MICROELECTRONICS CORP ]
