Specifications (Continued)
Parameter
Conditions
-
XRANGE = open
XRANGE = V
SS
XRANGE= open
XRANGE= V
SS
-
I
SINK
= -1mA
I
SOURCE
= 1mA
V
O
=V
DD
, V
SS
-
V
DD
= 5V
V
DD
= 2.7V
V
DD
= 5V
V
DD
= 2.7V
-
V
DD
= 5V
V
DD
= 2.7V
-
PD = V
DD
-
f=500 Hz
-
XOUT open
XOUT open
XOUT open
-
-
PD hi to lo
C
L
= 20 pF,
I
SINK
= -1mA
C
L
= 20 pF,
I
SOURCE
= 1mA
C
L
= 20 pF
C
L
= 50 pF,
R
L
= 100 k
Min
-
-
-
-
-
50
-
Max
-
Units
-
dBm
dBm
dBm
dBm
-
V
V
μ
A
V
V
V
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
V
k
kHz
V
V
%
pF
M
ms
V
Notes
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Signal Rejection, Frequency Range
950, 1400, 1800 Level: V
DD
= 5.0V
Hz
-40 (7.8 mV)
-50 (2.5 mV)
-43 (5.5 mV)
-53 (1.7 mV)
ms
0.5
-
1
0.5
-
-
50
20
6
100
25
10
50
V
DD
-
28
0.2
-
60
10
-
30
0.2
Level: V
DD
= 3.0V
Duration
OUT n,
STROBE pins
OUT n pins
EN, OE,
XRANGE, MODE, V
IH
PD pins
Pull-up and
Pull-down currents
Outputs
V
OL
V
OH
I
OZ
V
IL
V
DD
-0.5
-
-
V
DD
- 2.0
V
DD
- 0.5
12.5
4
2
12.5
12.5
4
12.5
-6.5
80
-
-
V
DD
-0.2
40
-
20
-
-
Inputs
MODE = V
SS
/XRANGE = V
SS
MODE2 = V
DD
PD = V
DD
Pull-down current
Voltage range
Input impedance
Input spectrum
V
IL
PD pin
SIGIN pin
Clock
External clock
connected to XIN V
pin
XIN, XOUT with
crystal osc. active Internal resistance
Duty cycle
Capacitance
Power up (t
PU
)
V
OL
X358 pin
V
OH
V
DD
- 0.2
-
V
-
Duty cycle
40
-
-
60
250
250
%
ns
ns
-
-
Tri-state
Operation
t
EN
(High Z to Low Z)
t
DE
(Low Z to High Z)
Unless otherwise noted, V
DD
- V
SS
= 5V, Ta = 25°C, PD at logical low state, and XRANGE at a logical high state. Power levels are in dBm referenced to 600 ohm. DC voltages are referenced to V
SS
.
Notes:
1. Per tone.
2. See Table 4 for detection/rejection frequencies.
M-985-01
www.clare.com
3
Rev. 1
Call Progress Tone Detection
Call progress tones are audible tones sent from switch-
ing systems to calling parties to show the status of calls.
Calling parties can identify the success of a call placed
by what is heard after dialing. The type of tone used and
its timing vary from system to system, and though
intended for human ears these signals can provide
valuable information for automated calling systems.
The M-985-01 contains five signal detectors sensitive to
the frequencies often used for these progress tones.
Electronic equipment monitoring the OUTn outputs of
the M-985-01 can determine the nature of signals pres-
ent by measuring their duty cycle. See Mechanical
Dimensions for a diagram of a circuit that could be used
to permit a microcomputer to directly monitor tones on
the telephone line. Much of the character of the
progress tones is in their duty cycle or cadence (some-
times referred to as interruption rate). This information,
coupled with level and frequency indication from the M-
985-01, can be used to decide what progress tones
have been encountered.