EM91420 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
phone handset to prevent that the dialing signal (DTMF) is coupling by the Microphone of the phone handset.
(such as pocket dialer)
i. In idle state, HKS is from “High” to “Low” (pick up handset action).
ii. In idle state, turn on handfree function.
iii. The flash operation ( F key ).
ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25 °C, all voltages referenced to VSS)
Items
Sym.
Rating
Unit
Power supply voltage
Input voltage range
Operating temperature
Storage temperature
Power consumption
VDD
VIN
6.0 Vdc
VSS-0.3V ~ VDD+0.3V
0 ~ +50
V
V
TOPR
TSTO
PD
°C
-55 ~ 125
°C
500
mW
ELECTRICAL CHARACTERISTICS
(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
unload
Operating voltage
Pulse
Tone
Pulse
Tone
Pulse
Tone
2.0
2.0
-
-
5.5
5.5
V
Operating current(HKS=0)
Idd
-
-
-
-
-
-
-
0.15
0.3
0.15
0.3
0.001
0.001
1
0.3
unload
0.5
mA
0.3
0.5
with pull up/down
resistor * 8
Memory retention current
Standby current
Imrt
0.1
uA HKS=1,Vdd=1V
HKS=1 Istby
HKS=0
HKS=1
HKS=0
ViH
0.1
unload
10
uA
-0.001
10
0.1
with pull up/down
-
30
Vdd
resistor * 8
V
HKS, HFI & DRING
0.8Vdd
-
pins: input voltage
ViL
Vss
-
0.2Vdd
HFO & HDO pins source current
PO, HFO, XMUTE, RMUTE
& SDO pins: sink current
PO, XMUTE, RMUTE and SDO
IoH
IoL
0.2
-0.2
-
-
-
-
mA Vo = 2.0 V
mA Vo = 0.5 V
IoH
-
-
±0.001 uA Vo = Vdd
pins: leakage current
HFI pin input resistance
DRING pin input resistance
Keyboard scanning pins
output current (except COL4/KT)
COL4/KT source current
sink current
Rhfi
-
-
200
100
10
400
-
-
-
KΩ Vhfi = Vss
KΩ Vdeing=Vss
uA Vksn=Vss
Rdring
IoH
IoL
IoH
IoL
2
50
800
-
200
0.2
0.2
V
ksn=Vdd
mA Vo=2.0V
Vo=0.5V
-
-
* This specification are subject to be changed without notice.
10.1.1997
11
ELAN [ ELAN MICROELECTRONICS CORP ]
