CHAPTER 7: ELECTRICAL CHARACTERISTICS

7.8 Telephone Function Characteristics

Unless otherwise specified:

VDD=3.0V, VSS=0V, fCLK=3.579545MHz, Ta=-20 to 70°C

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Flash pause time

tFLP

 

–

938

–

ms

Mute hold time

tMH

 

–

4

–

ms

Make ratio

M/B

Selected by software

–

1/2

–

–

 

 

 

 

2/3

 

 

Dial puls rate

DR

Selected by software

–

10

–

pps

 

 

 

 

20

 

 

Make time

tM

10pps, M/B=1/2

–

33.2

–

ms

 

 

20pps, M/B=1/2

–

16.6

–

ms

 

 

10pps, M/B=2/3

–

39.1

–

ms

 

 

20pps, M/B=2/3

–

19.5

–

ms

Break time

tB

10pps, M/B=1/2

–

66.4

–

ms

 

 

20pps, M/B=1/2

–

33.2

–

ms

 

 

10pps, M/B=2/3

–

58.6

–

ms

 

 

20pps, M/B=2/3

–

29.3

–

ms

Tone output DC level

VTDC

 

–

0.5(VDD-VSS)

–

V

ROW single tone

VR

VDD=3V, RL=10kΩ

–

92

–

mVrms

output voltage

 

VDD=5.5V, RL=10kΩ

–

168

–

mVrms

COL single tone

VC

VDD=3V, RL=10kΩ

–

122

–

mVrms

output voltage

 

VDD=5.5V, RL=10kΩ

–

224

–

mVrms

Tone output voltage ratio

dBCR

VDD=3V, RL=10kΩ

–

2.5

–

dB

 

 

VDD=5.5V, RL=10kΩ

–

2.5

–

dB

Tone load resistor

RTL

VDD=2.5 to 5.5V

7

–

–

kΩ

Tone distortion ratio

THD

VDD=2.5 to 5.5V, RL=10kΩ

–

–

6

%

Tone output frequency

fROW1

 

–

701.32

–

Hz

 

fROW2

 

–

771.45

–

Hz

 

fROW3

 

–

857.17

–

Hz

 

fROW4

 

–

935.10

–

Hz

 

fCOL1

 

–

1215.88

–

Hz

 

fCOL2

 

–

1331.68

–

Hz

 

fCOL3

 

–

1471.85

–

Hz

 

fCOL4

 

–

1645.01

–

Hz

Tone output time

tTD

 

94

–

–

ms

Tone inter-digit pause time

tTIP

 

–

94

–

ms

Tone output cycle

tT

tTD+tTIP

188

–

–

ms

7.9 Timing Chart

System clock switching

OSCC

5 msec min.

 

 

 

 

1 instruction execution

 

 

 

 

 

time or longer

 

 

 

 

 

CLKCHG

166

EPSON

S1C63558 TECHNICAL MANUAL