IL91260C
Pin Description
Pin No.
1
2
3
4
5
Designation
R1
R2
R3
R4
HK
Hook switch input.
When HK = V
CC
, an ON-Hook state exists.
When HK = GND, an Off-Hook state exists.
Dial pulse Make/Break ratio select input.
If M/B = V
CC
, the Make/Break ratio is 1/2.
If M/B = GND, the Make/Break ratio is 2/3.
Pulse/DTMF mode select input.
If MODE SELECT = V
CC
, Pulse mode is in effect.
If MODE SELECT = GND, DTMF mode is in effect.
Oscillator I/O.
A 480 KHz ceramic resonator and two 100 pF serial loading capacitors form
a complete oscillator circuit. The circuit is activated when HK is low.
Oscillator start-up time is typically 10 ms.
Description
Keyinputs.
When a row and a column are connected, a key operation is activated.
Scanning signals are present on both the row and column pins during a valid
key-in condition.
6
M/B
7
MODE SELECT
8
9
OSCI
OSC0
10
11
12
V
CC
GND
TONE
Positive power supply.
Negative power supply.
DTMF signal output.
Pull-down load resistance is 10,000
Ω.
The minimum tone and IDP durations are built-in for both normal dialing
and redialing.
Transmit mute output.
This is an N-channel open drain output. The output transistor is switched on
while a sequence of digits is being dialed (for both Pulse and Tone modes).
Otherwise, it is switched off.
Dial pulse output.
This pin is an N-channel open drain output. When DP output is low
(switched on), it serves as a break signal in Pulse dialing. For other
operations, DP output is normally high impedance (switched off).
Keyinputs.
When a row and a column are connected, a key operation is activated.
Scanning signals are present on both the row and column pins during a valid
key-in condition.
13
XMUTE
14
DP
15
16
17
18
C1
C2
C3
C4
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