EM91450 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE
AND I.P.P. DETECT FUNCTION
ABSOLUTE MAXIMUM RATINGS
(Ambient temperature is 25
o
C, all voltages referenced to V
SS
)
Items
Power supply voltage
Input voltage range
Operating temperature
Storage temperature
Power consumption
Sym.
V
DD
V
IN
T
OPR
T
STO
P
D
Rating
6.0 Vdc
V
SS
-0.3V ~ V
DD
+0.3V
0 ~ 50
-55 ~ 125
500
Unit
V
V
o
C
o
C
mW
DC ELECTRICAL CHARACTERISTICS
(Ambient temperature is 25
o
C, V
DD
=2.5V unless otherwise noted, all voltages referenced to V
SS
, Fosc=3.579545 MHz)
Parameter
Operating voltage
Operating current(HKS=0)
Memory retention current
Standby current
Pulse
Tone
Pulse
Tone
HKS=1
HKS=0
HKS=1
HKS=0
Sym.
Min.
2.0
2.0
-
-
-
-
-
-
0.8V
DD
V
SS
V
SS
0.9V
DD
0.2
-0.2
-
-
2
200
0.2
0.2
-0.2
0.5
142
1
-
5
Typ.
-
-
0.15
0.3
-
-
1
-
10
-
-
-
-
-
-
-
200
10
400
-
-
-
-
160
2
-30
-
Max. Unit
5.5
5.5
0.3
0.5
0.1
0.1
10
0.1
30
V
DD
0.2V
DD
0.1V
DD
V
DD
-
-
0.01
-
50
800
-
-
-
0.75
180
3
-23
-
V
mA
uA
uA
Condition
unload
with pull up/down
resistor * 8
HKS=1,Vdd=1V
unload
with pull up/down
resistor * 8
Idd
Imrt
Istby
Distortion(dB)=20 log
{[V
12
+V
22
+V
32
..... +V
n2
)1/2]/[(V
L2
+V
H2
)1/2]}
V
L
, V
H
=ROW group and column group signal.
V
1
, V
2
, V
3
.... V
n
= Harmonic signal (BW=300Hz~3500Hz)
* This specification are subject to be changed without notice.
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HKS, HFI & DRING
pins: input voltage
Xmute pin : Schmitt triggers
(input pin)
HFO & HDO pins source current
PO, HFO, XMUTE, RMUTE
& SDO pins: sink current
PO, XMUTE, RMUTE and SDO
pins: leakage current
HFI pin input resistance
Keyboard scanning pins
output current (except COL4/KT)
COL4/KT source current
sink current
DTMF pin: sink current
DTMF signal DC level
DTMF signal: ac level
pre-emphase
distortion
load resistance
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ViH
ViL
V
H-L
V
L-H
IoH
IoL
IoH
Rhfi
IoH
IoL
IoH
IoL
IoL
Vdc
Vdtmf
Twist
THD
ZL
V
V
V
mA
mA
uA
KΩ
uA
µA
mA
mA
Vdd
mVrms
dB
dB
KΩ
at idle state
Vo = 2.0 V
Vo = 0.5 V
Vo = Vdd
Vhfi = Vss
Vksn=Vss
ksn=Vdd
Vo=2.0V
Vo=0.5V
Vdtmf = 0.5 V
Vdd = 2.0V ~ 5.5V
Row group
Column - Row
ZL = 5 KΩ
THD
< −
23dB
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2.10.1999
11
EMC [ ELAN MICROELECTRONICS CORP ]
