Clare Inc.

M-959 Datasheet Preview

M-959 Datasheet

Dial Pulse Counter and Hook Status Monitor

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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 Datasheet Preview

M-959 Datasheet

Dial Pulse Counter and Hook Status Monitor

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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

–

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

315

157.5

105

315

105

52.5

210

105

2.0

1.5

5.0

± 30

2.0

0.5

5.0

–

± 1.0

2.0

Units

µA

Notes

1, 2

1,3

1, 4

1, 3

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M-959 Datasheet

Dial Pulse Counter and Hook Status Monitor

M-959 Datasheet

Dial Pulse Counter and Hook Status Monitor

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