as2574b austriamicrosystems, as2574b Datasheet - Page 22

• Manufacturer Part Number: as2574b
• Description: 20 Number One Touch Dialler With Serial Bus For Display Driver
• Manufacturer: austriamicrosystems

Data Sheet
Signalling Characteristics
Defaults conditions: Recommended Operating Range
Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue
Note 2: The rise time is the time from valid key detection (key has been debounced) till the tone amplitude has reached 90 % of its
Note 3: Relative to high group.
Rev. 1
Parameter
Clock Startup Time
Key Debounce Time
HS Debounce Time
CD Reset Delay Time
DTMF
LD
Flash
Earth Recall
Automatic Access Pause
Mute Overhang
MR/MT Hold Over
Tone Burst
Time-out
Tone Level, High Group
Preemphasis
Distortion
Tone Duration
Inter Tone Pause
Tone Rise/Fall Time
Dial Rate
Make/Break Period
(diode option)
Inter Digit Pause
Pre Digit Pause
Post Digit Pause
Duration
Short
Long
Termination
Frequency
Output Level
Tone Duration
Inter Tone Pause (LS)
Inter Tone Pause (Mute)
Duration
as long as the key is depressed.
final value.
Symbol
Tm/Tb
Titb1
Titp2
Tpre
Tmo
Tidp
Tpo
Tap
Tho
Ths
Titp
Vtb
Vol
Ttd
Tfd
Ttb
Tto
Ts
Td
Ttr
Tg
Fb
Tr
- 12.4
1.15
Min
753
100
600
500
182
700
7.9
-13
1.8
7.7
14
21
80
80
55
55
18
80
2
4
7
22
- 10.9
33/66
40/60
101.2
82.3
82.3
Typ
200
2.5
4.1
1.2
-11
10
2
8
8
2
8
- 9.4
Max
1.25
- 26
785
103
620
510
223
800
2.8
4.2
8.1
2.2
8.2
18
26
85
85
57
57
27
85
-9
5
5
9
dBm
dBm
dBm
Unit
pps
sec
dBr
sec
sec
sec
sec
sec
sec
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
Hz
Condition
RL = 15 k
RL = 15 k
RL = 15 k , note 3
Note 1
Note 1
Note 2
No diode 2
With diode 2
DT = Hi-Z
DT = Low
DT = High
5%
5%
5%
AS2574B
Jan. 1995