IL91210E Datasheet, PDF (3/11 Pages) Integral Corp. – Tone/Pulse Dialer High-Performance Silicon-Gate CMOS

IL91210E
Pin Description
Pin No. Designation
Description
1
R1
Key board pins.
2
R2
These inputs serve as the interface to a 4x4 matrix keyboard.
3
R3
4
R4
5
HK
Hook switch input.
This inverter input pin detects the state of the hook switch contact. “Off
Hook” is represented by a GND condition. “On Hook” is represented by a
V_CC condition.
6
M/B
Make/Break Ratio Select Input.
This input allows selection of the Make/Break ratio.
M/B = V_CC : 1/2
M/B = GND : 2/3
7
MODE SELECT Mode select input.
This input allows the selection of pulse mode or DTMF mode.
MODE SELECT = V_CC : Pulse mode operation
MODE SELECT = GND : Tone mode operation
8
OSCI
Oscillator Input and Output pins.
9
OSC0
The time base for IL91210E is a crystal controlled on-chip oscillator, which
is completed by connecting a 3.58 MHz crystal or ceramic resonator
between OSCI and OSC0 pins.
10
V_CC
Power supply pins.
11
GND
This device is designed to operate from 2.0 V to 5.5 V.
12
TONE
Tone dialing output.
When a valid keypress is detected in the DTMF mode, appropriate low
group and high group frequencies are generated, which hybridize the dual
tone output. TONE output is in the “OFF” state in pulse mode.
13
XMITMUTE Dialing transmission mute output.
This is an N-channel open drain output
The XMIMUTE is normally “OFF”. During pulse or DTMF dialing this
output is “ON”.
14
DP
Dialing pulse output.
This is an N-channel open drain output. The normal output will be “ON”
during Break and “OFF” during Make in the pulse dialing mode.
15
C1
Key board pins.
16
C2
These inputs serve as the interface to a 4x4 matrix keyboard.
17
C3
18
C4
Internal Pull low.