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PDF IL9151-3 Data sheet ( Hoja de datos )
| Número de pieza | IL9151-3 | |
| Descripción | Pulse Dialer | |
| Fabricantes | IK Semiconductor | |
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TECHNICAL DATA
PULSE DIALER
IL9151-3
The IL9151-3 pulse dialer is a monolithic CMOS integrated circuit which
converts pushbutton inputs to a series of pulses suitable for telephone dialing.
It is intended to replace mechanical telephone dialers and can operate directly
from telephone lines. CMOS technology is used to produced this device,
resulting in very low power requirements and high noise immunity. The
IL9151-3 can be easily interfaced with a variety of telephones, requiring only
a minimal number of external components.
• Direct telephone line operation
• 4 x 3 matrix keyboard interface
• Supply voltage range of 2.0 to 5.5 volts
• Inexpensive RC oscillator
• Low power standby mode for redialing
• 22-digit redial memory
• Redial with either * or # key
• Dialer reset for line power breaks > 200 ms
• Selectable make/break ratio
• High speed test capacity
ORDERING INFORMATION
IL9151-3N Plastic
TA = -20° to 70° C for package
PIN ASSIGNMENT
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LOGIC DIAGRAM
PIN 5 = VCC
PIN 12 = GND
KEYBOARD ASSIGNMENT
R1 1 2 3
R2 4 5 6
R3 7 8 9
R4 * 0 #
C1 C2 C3
(*,# : Redial)
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IL9151-3
Operation Procedures
Symbol Definitions:
DP: pulse digit (0 through 9)
ZiZiZi: conversation
0-0↑: off-hook.
0-0↓: on-hook.
* or # : Redial
Recommended Operations:
Normal Dialing:
0-0↑; DP ... DP; ZiZiZi; 0-0↓
Dial pulse begins as soon as first key is entered.
Debounced and detected on chip.
Redialing:
0-0↑; * or # key
(* or # key can be accepted as first key entry after Off-
Hook.)
Functional Description
1) N-channel open drain output - DP (Figure 1).
2) Clock oscillator
The clock oscillator consists of two inverters, with the
frequency of oscillation controlled by external
components connected to pins 6,7, and 8. The circuit is
sufficiently versatile to allow the use of a variety of
external component configurations. The oscillator
circuit is shown in figure 2.
Figure 1
Figure 2
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