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PDF SA541 Data sheet ( Hoja de datos )
| Número de pieza | SA541 | |
| Descripción | PULSE/DTMF SWITCHABLE DIALLERS | |
| Fabricantes | Sames | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA541 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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sames
SA541, SA54L1
PULSE/DTMF SWITCHABLE DIALLERS
FEATURES
s Selectable Loop-Disconnect (Pulse)
or DTMF (Tone) dialling modes
s Keypad switchable Loop-Disconnect to
DTMF during a call
s 32 Digit Last Number Redial (LNR) s Selectable Break:Make Ratios 2:1 or
s Selectable Interdigit Pause (IDP)
3:2
500ms or 800ms
s Uses inexpensive 560KHz ceramic
s Operates with inexpensive single con-
resonator
tact keypad
s Earth Loop Recall and Timed Break
s On-chip Darlington transistor pair for
Recall (Timed Flash)
DTMF tone filtering
s Low on-hook Supply Current options
s Low power CMOS technology enables
direct operation from Telephone line
SA5413 - 5µA @ 2.5V
SA5416 - 1µA @ 2.5V
SA5419 - 1µA @ 3.0V
s
Optional use of external capacitor for
oscillator
s
Call, barring/locking feature available
on the SA54L1
PIN CONNECTIONS:
SA541
PIN CONNECTIONS:
SA54L1
M57-1529
PDS039-SA541-001
REV. B
1/16
02-09-94
1 page  
SA541
Block Diagram
Figure 1 depicts the SA54X1 block diagram, while Table 1 lists the respective pin
functions.
Figure 1: SA54X1 Block Diagram
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5 Page 
DTMF Tone Filtering
SA541
Figure 3: 2-Pole Sallen and Key Filter Circuit
9. DTMF Dialling (Figure 4)
During DTMF dialling, the MUTE output goes to logic ‘1’ and remains there for the
duration of the tone transmission. The IMP output remains low during tone
transmission. The MF OUT output rises to its d.c. level of 0,9 VDD at the start of the
tone transmission and is kept there between tone bursts. This is to avoid transients
at the beginning and end of tone bursts.
The maximum rate at which tones are sent to line is 100ms on, followed by 100ms
off. If keys are activated faster than this, they are placed in a temporary store and
then sent to line at the maximum rate. Dialling from the LNR store occurs at the
maximum rate.
If a key is held down for longer than 100ms, the tone output will continue until the
key is released.
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SA541.PDF ] | |
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