SA545 Datasheet, PDF (6/18 Pages) Sames – PULSE/DTMF SWITCHABLE DIALLERS WITH 10 REPERTORY MEMORIES

SA545
SA545
10
9
4
5
12
SA54L5
10
9
4
5
14
Designation
V_DD
V_SS
OSC OUT
OSC IN
MUTE
3
3
MASK
6
6
FILT IN
7
7
FILT OUT
11
13
MF OUT
1
1
IMP
2
2
SELECT
13
15
C1
14
16
C2
15
17
C3
20
22
C4
16
18
R1
17
19
R2
18
20
R3
19
21
R4
8
8
HSW
-
11
LOCK
-
12
N/C
Description
Positive Supply input
Negative Supply input
Connections for 560KHz ceramic resonator
Active high output during keying and tone transmission.
(See Note 1)
Output to disable speech circuit during pulse dialling
and recall. (See Note 2)
Unity gain amplifier input and output for DTMF tone
filtering
DTMF output
'Loop disconnect' dialling output. During dialling, a
logic 1 (high level) correponds to loop connection while
a logic 0 (low level) corresponds to loop disconnection.
LD/DTMF selection, IDP and B:M ratio programming
Column output connections for 16 button single contact
keypad
Row input connections for 16 button single contact
keypad
Hookswitch input. A logic 1 (High) applied to this input
indicates an "off-hook" condition.
Lock Input must be tied to V_SS to disable all keypad keys
(except TBR and LNR). Normal operation is enabled by
connecting LOCK to V_DD.
No connection
Note 1: The MUTE output is provided to disable the microphone (via the speech
network) while maintaining the loop condition during DTMF transmission.
Note 2: The MASK output may be used to disconnect the whole speech circuit in order
to maintain the break condition whilst on-hook, during a Timed Break Recall
(TBR) operation or LD dialling.
Table 1: Pin Description
6/18
sames