Datasheet M-991-02SMTR, M-991-02SM, M-991-01SMTR, M-991-01SM, M-991 Datasheet (CLARE)

Part # Description

M-991 14-pin plastic DIP
M-991-01SM 16-pin SOIC
M-991-01SMTR 16-pin SOIC Tape and Reel
M-991-02SM 16-pin SOIC, Extended

Temperature Range

M-991-02SMTR 16-pin SOIC, Extended

Temperature Range, Tape and
Reel

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DS-M991-R1

M-991

Call Progress Tone Generator

1

Block Diagram

Pin Assignments

Ordering Information

Features

• Generates standard call progress tones

• Digital input control

• Linear (analog) output

• Power output capable of driving standard line

• 14-pin DIP and 16-pin SOIC package types

• Single supply 5V CMOS (low power)

• Inexpensive 3.58 MHz time base

• Temperature range from -25ºC to 70ºC (-01 ver-

sion)

• Temperature range from -40ºC to 85ºC (-02 ver-

sion)

Applications

• Telephone systems

• Test equipment

• Callback

• Security systems

• Billing systems

Description

The M-991 is a call progress tone generator integrated
circuit for use in telephone systems. The circuit uses
low-power CMOS techniques to generate tones which
are digitally controlled and highly linear. The M-991 is
designed to permit operation with almost any system.
The use of integrated circuit techniques allows the M­991 to incorporate the control, tone generating, and
power output buffer into a single 14-pin DIP or a 16-pin
SOIC. A 3.58-MHz (color burst) crystal-controlled time
base guarantees accuracy and repeatability.

Absolute Maximum Ratings

Storage Temperature -55° to 125° C
Operating Ambient Temperature -25° to 70° C
Operating Ambient Temperature -40° to 85° C

for the M-991-02SM
V

DD

7.0V

Any Input Voltage VSS-0.6 to VDD+0.6V

Note:

1. Exceeding these ratings may permanently damage the M-991.

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2

M-991

Rev. 1

7. At XOUT pin as compared to 3.579545 MHz.

8. OUTDRIVE with load >5 KW/OUTDRIVE with
540 W load.

9. Resistance at V

REF

to VDDor VSS> 1 MW.

10. Crystal oscillator active.

11. Measured 90% to 10%.

Absolute Maximum Ratings are stress ratings. Stresses in
excess of these ratings can cause permanent damage to
the device. Functional operation of the device at these or
any other conditions beyond those indicated in the opera­tional sections of this data sheet is not implied. Exposure of
the device to the absolute maximum ratings for an extend­ed period may degrade the device and effect its reliability.

Specifications

Parameter Min Typ Max Units Notes

Power Supply V

DD

4.75 - 5.25 V 1

and Reference Current Drain, IDD - 2.0/4.0 - mA 8

V

REF

Pin:

Deviation from (V

DD

+ VSS)/2 -2 - +2 %

Internal Resistance from V

REF

3.25 - 6.75 kΩ

to VDD, V

SS

Oscillator Frequency Deviation -0.01 - +0.01 % 7

External Clock: (XOUT open)

V

IL

0 - 0.2 V

V

IH

VDD- 0.2 - V

DD

V

Duty Cycle 40 - 60 %

XIN, XOUT Loading:

Capacitance - - 10 pF 10
Resistance 20 - - MΩ -

Tone Output Frequency Deviation -0.5 - +0.5 % -

Level 100 - 180 mV 2
Distorting Components -35 - - dB 3
Idle - - -60 dBm 4
OUTDRIVE Envelope Rise Time - - 4 ms 5

Control DX, CE Pns:

V

IL

- - 0.5 V 6

V

IH

2.5 - - V

Mute Pins:

VOL (I

SINK

= -100 µA) - - 1.5 V

V

OH (ISOURCE

= 100 µA) VDD- 1.5 - - V

Timing Data Setup (t

DS

) 200 - - ns 11

Data Hold (t

DH

)10--ns

Chip Enable Fall (t

PL

)--90ns
Tone On Delay (tTO)--5ms
Tone Off Delay (tTD)--5ms
Mute DelayfromOutdrive (t

MO

) - - 200 ns

Notes: (unless otherwise specified)

1. All DC voltages are referenced to VSS.

2. Vrms per tone, 540 W load.

3. Any one frequency relative to the lowest level output tone (f<4000 Hz).

4. 0 dBm = 0.775 Vrms.

5. To 90% maximum amplitude.

6. For all supply voltages in the operating range.

Data/Tone Selection

D0 D1 D2 D3 Frequency (Hz) Use

12

0000350 440Dial Tone
0 0 0 1 400 off Special
0010440 offAlert Tone
0011440 480Audible Ring
0100440 620Pre-empt
0101480 offBell high tone
0110480 620Reorder(Bell low)
0111350 offSpecial
1000620 offSpecial
1001941 1209 DTMF “

*

”

Pin Function

Pin Function

CE Latches data and enables output (active

low input).
D0 - D3 Data input pins. (See Data/Tone Selection.)
D4-D5 Leave open.
MUTE Output indicates that a signal is being generated at

OUTDRIVE.
OUTDRIVE Linear buffered tone output.
V

DD

Most positive power supply input pin.
V

REF

Internally generated mid-power supply voltage

(output).
V

SS

Most negative power supply input pin.
X

IN

Crystal oscillator or digital clock input.
X

OUT

Crystal oscillator output.

M-991

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3

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 dial­ing. The M-991 series utilizes a highly linear tone gen­erator that produces the unique frequencies (singly or
in pairs) that are common to call progress signals.

Duration and frequency selection are digitally con­trolled (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

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 out­put. 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

REF

pin to ground with a small
capacitor (0.01 mF) to reduce power supply noise. The
designer should be aware of device timing require­ments 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.

Standard Call Progress Tones

Tone Name Frequency (Hz) Interruption Rate

12

Dial 350 440 Steady

Reorder 480 620 Repeat, tones on and off 250 ms ± 25 ms each.

Busy 480 620 Repeat, tones on and off 500 ms ± 50 ms each.

Audible Ring 440 480 Reat, tones on 2 ± 0.2 s, tones off 4 ± 0.4 s

Recall Dial 350 440 Three bursts tones on and off 100 ms ± 20 ms each followed by dial tone.

Special AR 440 480 Tones on 1 ± 0.2s, followed by single 440 Hz on for 0.2s on, and silence for 3 ±

0.3 s, repeat.

Intercept 440 620 Repeat alternating tones, each on for 230 ms ± 70 ms with total cycle of 500 ±

50 ms.

Call Waiting 440 Off One burst 200 ± 100 ms

Busy Verification 440 Off 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

Executive Override 440 Off One burst of tone for 3 ± 1 s before overriding station intrudes

Confirmation 350 440 Three bursts on and off 100 ms each or 100 ms on, 100 ms off, 300 ms on

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4

M-991

Rev. 1

Expanded Timing Diagram

Typical Application

Timing Diagram

Power-on Reset Circuit

Tolerances

Inches Metric (mm)

Min Max Min Max

A .0926 .1043 2.35 2.65

A1 .0040 .0118 .10 .30

b .013 .020 .33 .51

D .3977 .4133 10.10 10.50

E .2914 .2992 7.4 7.6
e .050 BSC 1.27 BSC

H .394 .419 10.00 10.65

L .016 .050 .40 1.27

Tolerances

Inches Metric (mm)

Min Max Min Max

A - .210 - 5.33

A1 .015 - .38 -

b .014 .022 .36 .56

b2 .045 .070 1.1 1.8

C .008 .014 .20 .36

D .735 .775 18.7 19.7

E .300 .325 7.6 8.3

E1 .240 .280 6.1 7.1

e .100 BSC 2.54 BSC

ec 0° 15° 0° 15°

L .115 .150 2.9 4.1

M-991

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5

Rev. 1

Mechanical Dimensions

Dimensions

mm

(inches)

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Clare, Inc. makes no representations or warranties with respect to
the accuracy or completeness of the contents of this publication
and reserves the right to make changes to specifications and
product descriptions at any time without notice. Neither circuit
patent licenses nor indemnity are expressed or implied. Except as
set forth in Clare’s Standard Terms and Conditions of Sale, Clare,
Inc. assumes no liability whatsoever, and disclaims any express or
implied warranty, relating to its products including, but not limit­ed to, the implied warranty of merchantability, fitness for a partic­ular purpose, or infringement of any intellectual property right.

The products described in this document are not designed,
intended, authorized or warranted for use as components in sys­tems intended for surgical implant into the body, or in other appli­cations intended to support or sustain life, or where malfunction
of Clare’s product may result in direct physical harm, injury, or
death to a person or severe property or environmental damage.
Clare, Inc. reserves the right to discontinue or make changes to its
products at any time without notice.

Specification: DS-M991-R1
©Copyright 2001, Clare, Inc.
All rights reserved. Printed in USA.
7/26/01