EM91440 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

11

* This specification are subject to be changed without notice.

10.1.1997

keyboard entry. In actual application of the RMUTE pin is recommended connection to microphone of the

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 ).

°C, all voltages referenced to V

Items

Sym.

Rating

Unit

Power supply voltage

V

DD

6.0 Vdc

V

Input voltage range

V

IN

V

V

Operating temperature

T

OPR

0 ~ +50

°C

Storage temperature

T

STO

-55 ~ 125

°C

Power consumption

P

D

500

mW

ELECTRICAL CHARACTERISTICS

(Ambient temperature is 25

°C, V

Parameter

Sym.

Min.

Typ.

Max. Unit

Condition

Operating voltage

Pulse

2.0

-

5.5

V

unload

Tone

2.0

-

5.5

Operating current(HKS=0)

Pulse

Idd

-

0.15

0.3

unload

Tone

-

0.3

0.5

mA

Pulse

-

0.15

0.3

with pull up/down

Tone

-

0.3

0.5

resistor * 8

Memory retention current

Imrt

-

0.001

0.1

uA

HKS=1,Vdd=1V

Standby current

HKS=1

Istby

-

0.001

0.1

unload

HKS=0

-

1

10

uA

HKS=1

-0.001

0.1

with pull up/down

HKS=0

-

10

30

resistor * 8

HKS, HFI & DRING

ViH

0.8Vdd

-

Vdd

V

pins: input voltage

ViL

Vss

-

0.2Vdd

HFO & HDO pins source current

IoH

0.2

-

-

mA

Vo = 2.0 V

PO, HFO, XMUTE, RMUTE

IoL

-0.2

-

-

mA

Vo = 0.5 V

& SDO pins: sink current

PO, XMUTE, RMUTE and SDO

IoH

-

-

±0.001 uA

Vo = Vdd

pins: leakage current

HFI pin input resistance

Rhfi

-

200

-

K

Ω Vhfi = Vss

DRING pin input resistance

Rdring

-

100

-

K

Ω Vdeing=Vss

Keyboard scanning pins

IoH

2

10

50

uA

Vksn=Vss

output current (except COL4/KT)

IoL

200

400

800

V

ksn=Vdd

COL4/KT source current

IoH

0.2

-

-

mA

Vo=2.0V

sink current

IoL

0.2

-

-

Vo=0.5V