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M-959
Dial Pulse Counter and Hook Status Monitor
Features
Time-guarded dial pulse counting
10 or 20 PPS dialing speeds pin selectable
Tri-state data outputs
Valid data output strobe
Data strobe control for use in interrupt-driven
environments
Independent hook status monitoring
Low-power CMOS construction
Pin Diagram
Description
The M-959 is a low-power dial pulse counter and
hook status monitor. Contained in a 14-pin package,
the M-959 requires no external components except a
single 3.579 MHz television color burst crystal.
The M-959 is typically connected to a loop current
sensing circuit, which is connected in series with the
voice pair (Tip and Ring) of a telephone line. The M-
959 receives pulses from the loop current sense cir-
cuit and translates them into logic level outputs
indicating hook status and decoded dialed digits.
Logic inputs to the M-959 select dialed digit speeds
and control Data and Strobe outputs supporting bus
interrupt driven implementations.
Ordering Information
Part #
M-959
Description
14-pin plastic DIP
Block Diagram
DS-M959-R3
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M-959
Absolute Maximum Ratings
DC Supply Voltage
6.0 V
Any Input Voltage Relative to VDD
Any Input Voltage Relative to VSS
Operating Temperature Range
+0.3 V
-0.3 V
-40˚C to +85˚C
Storage Temperature Range
-55˚C to + 125˚C
* Exceeding these ratings may permanently damage the M-959.
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.
Specifications
VDD - VSS = 2.5 through 6.0 V unless otherwise noted.
Parameter
Conditions
Min
Typ
Signal Timing Break Recognition
10 PPS
45
20 PPS 30 –
Spurious Break
– 0–
Rejection
Make Recognition 10 PPS 30 –
20 PPS 15 –
Interdigit Time (IDT)
10 PPS
285 300
20 PPS
142.5
150
Off-hook Delay
– 95 100
On-hook Delay
– 285 300
LC Hysteresis
– 1 1.5
EOD (End of Digit)
10 PPS
95 100
Recognition
20 PPS
47.5 50
STROBE Active
10 PPS
190 200
20 PPS
95 100
Data Change Before
1.0 1.5
Logic Input Input Voltages
Logic 0
0.0 2.25
Requirements
Logic 1
3.5 2.75
Input Current
––
Pull Up/Down Resistance
––
Logic Output Output Voltages
Logic 0
0.0
Characteristics
Logic 1
4.5
Output Currents
Vout = 2.5V
-2.1
-4.2
Vout = 4.6V
-0.44
-0.88
Vout = 0.4V
0.44
0.88
Tri-State Leakage – – –
Power
Supply Current
Requirement
– ––
Notes:
1. VDD - VSS = 5.0V
2. Maximimum is 30% of VDD - VSS
3. Minimum is 70% of VDD - VSS
4. No load.
5. Typical column for reference only.
Max
85
40
10
65
24
315
157.5
105
315
2
105
52.5
210
105
2.0
1.5
5.0
± 30
2.0
0.5
5.0
± 1.0
2.0
Units
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
V
V
µA
mA
V
V
mA
mA
mA
µA
mA
Notes
1, 2
1,3
1, 4
1, 3
1
1
1
2
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Rev. 3

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M-959
Pin Functions
Pin
LC
OH
10/20
D3-D0
OE
XIN
XOUT
Clear
Strobe
Function
Loop Current Input. Signal from phone line to be monitored for dial pulse signaling and hook status. Active low,
internally pulled high.
Off-hook Output. Hook status of phone line. Active (off-hook) high.
Pulse Speed Input. Low for 10 pulse per second, high for 20 pulse per second. Internally pulled low.
Data Outputs. Binary decoded rotary dialed digit. Active during valid digit time (strobe high), low at any other time.
Digit Dialed D3 D2 D1 D0
10 0 0 1
20 0 1 0
30 0 1 1
40 1 0 0
50 1 0 1
60 1 1 0
70 1 1 1
81 0 0 0
91 0 0 1
01 0 1 0
Output Enable Input. Active high, a log low tri-states D3 through D0 outputs. Internally pulled high.
Crystal Oscillator Input
Crystal Oscillator Output.
Strobe Control Input. Momentary high during digit valid time resets STROBE latch output low until next valid
digit is received. Internally pulled low.
Digit Valid Output. Indicates valid digit data present on D3 through D0. Active high.
Timing Diagram
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