4-20

‡ Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing.

*NOTES:

1.

Used for guard-time calculation purposes only.

2.

These, user adjustable parameters, are not device specifications. The adjustable settings of these minimums and maximums

are recommendations based upon network requirements.

3.

Figure 10 - Single-Ended Input Configuration

Characteristics

Sym

Min

Max

Units

Conditions

1

T

I

M

I

N

G

Tone present detect time

5

11

14

ms

Note 1

2

Tone absent detect time

0.5

4

8.5

ms

Note 1

3

Tone duration accept

40

ms

Note 2

4

Tone duration reject

20

ms

Note 2

5

Interdigit pause accept

40

ms

Note 2

6

Interdigit pause reject

20

ms

Note 2

7

O

U

T

P

U

T

S

Propagation delay (St to Q)

811

8

Propagation delay (St to StD)

12

16

9

Output data set up (Q to StD)

3.4

10

Propagation delay (TOE to Q ENABLE)

50

ns

load of 10 k

Ω,

50 pF

11

Propagation delay (TOE to Q DISABLE)

300

ns

load of 10 k

Ω,

50 pF

12

P

D

W

N

Power-up time

30

ms

Note 3

13

Power-down time

20

ms

14

C

L

O

C

K

Crystal/clock frequency

3.5759

3.5795

3.5831

MHz

15

Clock input rise time

110

ns

Ext. clock

16

Clock input fall time

110

ns

Ext. clock

17

Clock input duty cycle

40

50

60

%

Ext. clock

18

Capacitive load (OSC2)

30

pF

IN+

IN-

GS

INH

PDWN

OSC 1

OSC 2

TOE

St/GT

ESt

StD

Q4

Q3

Q2

Q1

DTMF

Input

X-tal

NOTES:

X-tal=3.579545 MHz

± 0.1%

MT8870D/MT8870D-1