EM91420 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
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:
frequency
Tdb
-
20
-
ms
Fkt
Tkt
Tp
-
600
30
-
Hz
duration
-
-
ms
Pause time
-
3.6
3.6
600
100
80
-
sec.
sec.
Pulse to Tone waiting time
Flash time
Tpt
Tf
-
-
-
-
Row3B, Row4B=NR, NR
Row3B, Row4B=NR, R-Vss
Row3B,Row4B=R-Vss, NR
Row3B,Row4B=R-Vss,R-Vss
Row1 = R-Vdd
-
-
ms
-
-
-
300
20
-
Pulse rate
PSR
-
-
pps
%
-
10
-
Row1 = R-Vss
Make/Break ratio
Inter-digit pause time
MBR
Tidp
-
-
40:60
33:66
800
500
-
-
Row2 = NR
-
Row2 = R-Vss
-
-
ms
mA
PSR = 10 pps
-
-
-
PSR = 20 pps
DTMF pin: sink current
DTMF signal DC level
DTMF signal: ac level
pre-emphase
IoL
-0.2
0.5
Vdtmf = 0.5 V
Vdc
-
0.75
Vdd Vdd = 2.0V ~ 5.5V
Vdtmf 142
160
2
180 mVrms Row group
Twist
1
3
dB
dB
KΩ
Column - Row
RL = 5 KΩ
distortion
THD
ZL
-
-30
-
-23
-
load resistance
5
THD < − 23dB
Minimum tone duration
Minimum inter-tone pause
Melody output signal:
main tone ac level
Tp
Titp
96
96
98
98
100
100
ms
Memory dialing
(-23.3)
53
(dBm)
Vmtac
48
58
mVms Vdd =2.0V ~ 5.5V
(dBm)
Sub-tone
(-25.3)
42
280
Vstac
Thdrdb
37
-
47 mVms Vdd =2.0V ~ 5.5V
-
HD key release hold function
debounce time
ms
SDO every bit time
Off-Hook delay time
Tbit
Tdly
3.8
-
3.9
300
4.1
-
ms
ms
* This specification are subject to be changed without notice.
10.1.1997
12
ELAN [ ELAN MICROELECTRONICS CORP ]
