M-991 Clare, M-991 Datasheet - Page 3

• Manufacturer Part Number: M-991
• Description: IC GENERATOR TONE LP CMOS 14-DIP
• Manufacturer: Clare

Specifications of M-991

• Function: Tone Generator
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Power (watts): -
• Interface: -

Rev. 1
Call Progress Tone Generation
Call progress tones are audible tones sent from
switching systems to calling parties (or equipment) to
indicate the status of calls. Calling parties can identify
the success of a placed call by what is heard after dial-
ing. The M-991 series utilizes a highly linear tone gen-
erator that produces the unique frequencies (singly or
in pairs) that are common to call progress signals.
Duration and frequency selection are digitally con-
trolled (see the Data/Tone Selection table below for
data settings for a particular tone output). A typical
control sequence for the M-991 is: (1) set data lines to
desired frequency selection, (2) wait for data lines to
settle, (3) drive the chip enable (CE) low, (4) maintain
CE low for desired tone duration (Note: data lines may
be changed after data hold time), and (4) return CE to
Data/Tone Selection
Standard Call Progress Tones
Tone Name
Dial
Reorder
Busy
Audible Ring
Recall Dial
Special AR
Intercept
Call Waiting
Busy Verification
Executive Override
Confirmation
D0
0
0
0
0
0
0
0
0
1
1
D1
0
0
0
0
1
1
1
1
0
0
D2
0
0
1
1
0
0
1
1
0
0
D3
0
1
0
1
0
1
0
1
0
1
Frequency (Hz)
350
400
440
440
440
480
480
350
620
941
1
1209
440
480
620
620
350
480
480
440
350
440
440
440
440
440
350
off
off
off
off
off
2
1
Frequency (Hz)
Dial Tone
Special
Alert Tone
Audible Ring
Pre-empt
Bell high tone
Reorder(Bell low)
Special
Special
DTMF “
440
620
620
480
440
480
620
440
Off
Off
Off
Use
2
*
”
www.clare.com
Steady
Repeat, tones on and off 250 ms ± 25 ms each.
Repeat, tones on and off 500 ms ± 50 ms each.
Reat, tones on 2 ± 0.2 s, tones off 4 ± 0.4 s
Three bursts tones on and off 100 ms ± 20 ms each followed by dial tone.
Tones on 1 ± 0.2s, followed by single 440 Hz on for 0.2s on, and silence for 3 ±
0.3 s, repeat.
Repeat alternating tones, each on for 230 ms ± 70 ms with total cycle of 500 ±
50 ms.
One burst 200 ± 100 ms
One burst of tone on 1.75 ± 0.25 s before attendant intrudes, followed by burst
of tone 0.65 ± 0.15 s on, 8 to 20 s apart for as long as the call lasts
One burst of tone for 3 ± 1 s before overriding station intrudes
Three bursts on and off 100 ms each or 100 ms on, 100 ms off, 300 ms on
Pin Function
a logic high. (Commonly used call progress tones are
shown in the Data/Tone Selection table below.) In a
bus-oriented system, noise on the data lines may
propagate through the device and appear at the out-
put. To safeguard against this, use an external latch to
lock the data into the device. In addition, it is good
practice to bypass the V
capacitor (0.01 mF) to reduce power supply noise. The
designer should be aware of device timing require-
ments and design accordingly. The data input pins
may be tied high (+5 VDC) or low (ground) as required,
but D4 and D5 must be left open. Beware of hardwiring
the CE pin for dedicated tone generation. This input is
edge triggered. An RC network like that shown in the
Power-on Reset Circuit on Page 4 should be used to
momentarily reset the device immediately following
power-up to ensure proper operation.
CE
D0 - D3
D4-D5
MUTE
OUTDRIVE
V
V
V
X
X
Pin
DD
REF
SS
IN
OUT
Latches data and enables output (active
low input).
Data input pins. (See Data/Tone Selection.)
Leave open.
Output indicates that a signal is being generated at
OUTDRIVE.
Linear buffered tone output.
Most positive power supply input pin.
Internally generated mid-power supply voltage
(output).
Most negative power supply input pin.
Crystal oscillator or digital clock input.
Crystal oscillator output.
Interruption Rate
REF
Function
pin to ground with a small
M-991
3