www.clare.com
DS-M984-02-R3
M-984-02
Special Information Tone Detector
1
Block Diagram
Pin Diagram
Ordering Information
Part #
Description
M-984-02P
14-pin plastic DIP
M-984-02S
16-pin plastic, SOIC
M-984-02T
16-pin SOIC, Tape and Reel
Description
The M-984-02 Special Information Tone Detector is a
monolithic integrated circuit designed to provide reli-
able detection of many common telephone network
status signals. In particular, it detects the signals
known as Special Information Tones (SITs) or error
tones as defined by the CCITT, and single tones often
used as dial tone, audible ringing, and other general
progress indications. The M-984-02 uses CMOS
switched capacitor filters and a crystal time base to
achieve the high stability and accuracy specified. Each
tone detection window has an associated output pin,
which can be placed in a high impedance state for use
with time-share microcomputer bus applications.
In comparison with the earlier M-984, the M-984-02
has wider acceptance bands for SIT tones to facilitate
reception of tape-loop tones, lower power consump-
tion at 5V operation, 3V operation, superior tempera-
ture performance, lower cost, and is available in DIP,
SOIC, and SOIC tape and reel versions.
Features
Detects single-frequency tones used for error
indication and call progress in telephone systems
Provides detection windows for:
400/425 Hz (Call Progress)
950 Hz (Special and error indication)
1400 Hz (Special and error indication)
1800 Hz (Special and error indication)
Separate tri-state outputs for each tone window
Inexpensive 3.58 MHz crystal time base
Auxiliary 3.58 MHz clock output
14-pin DIP package and 16-pin SOIC package
Single supply 3 to 5 volt (low power CMOS)
Wide dynamic range (30 dBm)
Applications
Automatic dialers
Modems
Telecom test equipment
Telephone traffic measurement,
Service evaluation
Billing equipment
Specifications
Parameter
Conditions
Min
Max
Units
Operating Conditions
V
DD
-
2.7
5.5
V
Power supply noise
0.1 - 5 kHz
-
20
mV p-p
Power
Current drain (I
DD
)
V
REF
open
-
15
mA
V
REF
V
REF
-
48% of V
DD
52% of V
DD
V
Impedance
-
3.25
8.25
k
Signal Detection
Frequency Range
-
Note 1
Note 1
-
Level: V
DD
= 5.0V
-
-30 (24.5 mV)
0 (775 mV)
dBm
Level: V
DD
= 3.0V
-
-33 (17.4 mV)
-3 (173.5 mV)
dBm
Duration
f
c
= 400 Hz
85
-
ms
f
c
= 950, 1400, 1800 Hz
50
-
ms
Bridge Time
-
-
15
ms
Signal to Noise Ratio
-
16
-
dB
Signal Rejection
Frequency Range
-
Note 1
Note 1
-
Level: V
DD
= 5.0V
-
-
-40 (7.8 mV)
dBm
Level: V
DD
= 3.0V
-
-
-43 (5.5 mV)
dBm
Duration
-
-
50
ms
Outputs
Except X358
V
OL
I
SINK
= -1.0 mA
-
0.5
V
V
OH
I
SOURCE
= 1.0 mA
V
DD
-0.5
-
V
Dn pins only
I
OZ
V
O
= V
DD
, V
SS
-
1
A
Inputs
EN pin
V
IL
-
-
0.5
V
V
IH
V
DD
= 5V
V
DD
-2.0
-
V
V
DD
= 2.7V
V
DD
- 0.5
-
V
Pull-up and Pull-
MODE = V
SS
V
DD
= 5V
12.5
50
A
down currents
V
DD
= 2.7V
4
20
A
/XRANGE +V
SS
-
2
6
A
MODE2 = V
DD
V
DD
= 5V
12.5
100
A
V
DD
= 2.7V
12.5
25
A
PD = V
DD
-
4
10
A
SIGIN pin
Voltage range
-
-6.5
V
DD
V
Input impedance
f = 500 Hz
80
-
k
Input Spectrum
-
-
28
kHz
Clock External
clock
V
IL
XOUT open
-
0.2
V
connected to
V
IH
XOUT open
V
DD
- 0.2
-
V
XIN pin
Duty cycle
XOUT open
40
60
%
XIN, XOUT with
Capacitance
-
-
10
pF
crystal ocs. active Internal res.
-
20
-
M
X358 pin
V
OL
C
L
= 20 pF, I
SINK
= -1.0 mA
-
0.5
V
V
OH
C
L
= 20 pF, I
SOURCE
= 1.0 mA
V
DD
- 0.5
-
V
Duty cycle
C
L
= 20 pF
40
60
%
Tri-state Operation
t
EN
(High Z to Low Z)
C
L
= 50 pF
-
250
ns
t
DE
(Low Z to High Z)
RL = 100 K
-
250
ns
Unless otherwise noted, specifications hold over V
DD
- V
SS
= 2.8V to 5.5V power supply, and T
OL
-40C to +85C.
Notes:
1. See the Detector Frequency Windows table on page 4 for detection/ rejection frequencies.
www.clare.com
M-984-02
Rev. 3
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 opera-
tional sections of this data sheet is not implied. Exposure of
the device to the absolute maximum ratings for an extend-
ed period may degrade the device and effect its reliability.
2
Absolute Maximum Ratings
DC Supply Voltage
7V
Input Voltage on SIGIN
V
SS
- 6.5V to V
DD
+0.3V
Input Voltage on Any Pin
V
SS
- 0.3 to V
DD
+ 0.3V
(except SIGIN)
Storage Temperature Range
-40C to +150C
Operating Temperature Range
-40C to +85C
Lead Soldering Temperature
260C for 5 seconds
Note:
Exceeding these ratings may permanently damage the device.
M-984-02
www.clare.com
Rev. 3
3
Pin Functions
PIN
FUNCTION
XIN
Crystal Connection -- 3.58 MHz crystal across these pins will produce the timebase needed for proper operation of the
XOUT
M-984-02. An external clock signal may be fed to XIN providing the clock signal has a duty cycle of 50
10% and comes within
0.2 volts of the supply rails. XOUT remains unconnected when an external clock is used.
X358
A buffered output pin. A 3.58 MHz clock signal is available for use in other circuits as a timebase. Leave open when unused.
ENVLP
The ENVLP pin is a common detection indicator for the four detect pins. Simply put, the ENVLP is a logical "OR" of the active
detect circuits for each of the four windows, though there is a delay provided to permit ENVLP to latch the first active detect pin.
ENVLP is not tri-state controlled.
V
SS
The power supply pins, V
DD
being the most positive. Commonly, V
DD
is at 3-5 volts, white V
SS
is at ground.
V
DD
SIGIN
Analog signal input. (Internally capacitively coupled.)
V
REF
V
REF
is a bias voltage generated in the chip for use in external analog circuits, such as active filters and AC-coupled buffers.
Leave open when unused.
OE
The tri-state control pin. OE places the DET pins in the active mode when at logic "1". When at logic "0," OE causes the DET
outputs to appear as high impedance. Should be tied to logic "1" when the M-984-02 is not used in a time-shared bus
application.
D1800
D1400
The detect outputs associated with each window. Tri-state control is available through use of the OE pin.
D950
Timing is shown in the Timing Diagram on page 4.
D400
Detector Frequency Windows
Detector
Low Reject
Low Accept
High Accept
High Reject
D400
363
392
459
493
D950
835
885
1016
1070
D1400
1275
1328
1472
1527
D1800
1656
1722
1854
1924
www.clare.com
4
M-984-02
Rev. 3
Typical Application
Timing Diagram
Tri-State Timing
M-984-02
www.clare.com
5
Rev. 3
Dimensions
mm
(inches)
Mechanical Dimensions
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
Tolerances
Inches
Metric (mm)
Min
Max
Min
Max
A
.093
.104
2.35
2.65
A1
.004
.012
.10
.30
b
.013
.020
.33
.51
D
.398
.413
10.10
10.50
E
.291
.299
7.4
7.6
e
.050 BSC
1.27 BSC
H
.394
.419
10.00
10.65
L
.016
.050
.40
1.27
PDF 
ZIP