SA589 Sames, SA589 Datasheet - Page 2

• Manufacturer Part Number: SA589
• Description: LD/DTMF SWITCHABLE DIALLERS WITH DEDICATED KEYS FOR 20 MEMORIES
• Manufacturer: Sames

TABLE 1:
1.
2.
OPERATION
Power-on
Memories are cleared and all logic is reset. The power-on reset circuit is designed such that
if the chip supply voltage drops to a level at which the memories may be corrupted, it will
always, under all conditions, clear the memory, so that corrupt data is not retained.
When power is applied to the chip, a power-on reset circuit operates and ensures that the
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SA589 FAMILY
number
Pin
10
11
12
13
17
18
19
20
21
26
27
16
22
23
24
25
14
15
28
1
3
4
5
6
7
8
9
2
MASK may be used to disconnect the whole speech circuit in order to maintain the break
condition whilst on-hook and during a TBR (Timed Flash) operation.
MUTE is provided to disable the microphone while maintaining the loop during DTMF
transmission.
PAUSE OUT Active high indicating a pause when dialling from memory
OSC OUT
FILT OUT
PIN FUNCTIONS
SELECT
MF OUT
OSC IN
FILT IN
ROW 5
ROW 6
ROW 7
ROW1
ROW2
ROW3
ROW4
MUTE
MASK
name
Hook'
COL1
COL2
COL3
COL4
COL5
COL6
COL7
HSW
IMP
Pin
V
NC
V
DD
SS
Unity gain amplifier input and output for DTMF tone filtering
Not connected
'Loop disconnect' dialling output
LD/DTMF selection, IDP and B/M ratio programming
Output to disable speech circuit during pulse dialling and recall
(see note 1)
Connections for 560kHz ceramic resonator
Hookswitch input - a logic 1 at this pin is used to indicate 'Off-
Negative supply
Positive supply
Unfiltered DTMF output
Output active during keying and tone transmission (see note 2)
Connections for 38 key single contact keypad
Function