Datasheet M-959 Datasheet (CLARE)

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DS-M959-R3

M-959

Dial Pulse Counter and Hook Status Monitor

1

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 M­959 receives pulses from the loop current sense cir­cuit 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.

• 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

Features

Pin Diagram

Ordering Information

Part # Description

M-959 14-pin plastic DIP

Block Diagram

Specifications

VDD- VSS= 2.5 through 6.0 V unless otherwise noted.

Parameter Conditions Min Typ Max Units Notes

Signal Timing Break Recognition 10 PPS 45 – 85 ms

20 PPS 30 – 40 ms
Spurious Break – 0 – 10 ms
Rejection
Make Recognition 10 PPS 30 – 65 ms

20 PPS 15 – 24 ms
Interdigit Time (IDT) 10 PPS 285 300 315 ms

20 PPS 142.5 150 157.5 ms
Off-hook Delay – 95 100 105 ms
On-hook Delay – 285 300 315 ms
LC Hysteresis – 1 1.5 2 ms
EOD (End of Digit) 10 PPS 95 100 105 ms
Recognition 20 PPS 47.5 50 52.5 ms
STROBE Active 10 PPS 190 200 210 ms

20 PPS 95 100 105 ms
Data Change Before – 1.0 1.5 2.0 ms

Logic Input Input Voltages Logic 0 0.0 2.25 1.5 V 1, 2
Requirements Logic 1 3.5 2.75 5.0 V 1,3

Input Current – – ± 30 µA
Pull Up/Down Resistance – – – 2.0 mA

Logic Output Output Voltages Logic 0 0.0 0.5 V 1, 4
Characteristics Logic 1 4.5 5.0 V 1, 3

Output Currents Vout = 2.5V -2.1 -4.2 – mA 1

Vout = 4.6V -0.44 -0.88 – mA 1
Vout = 0.4V 0.44 0.88 – mA 1

Tri-State Leakage – – – ± 1.0 µA

Power Supply Current – – – 2.0 mA
Requirement

Notes:

1. V

DD

- VSS= 5.0V

2. Maximimum is 30% of V

DD

- V

SS

3. Minimum is 70% of VDD- V

SS

4. No load.

5. Typical column for reference only.

Absolute Maximum Ratings

DC Supply Voltage 6.0 V
Any Input Voltage Relative to V

DD

+0.3 V

Any Input Voltage Relative to V

SS

-0.3 V
Operating Temperature Range -40˚C to +85˚C
Storage Temperature Range -55˚C to + 125˚C

* Exceeding these ratings may permanently damage the M-959.

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2

M-959

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 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.

Pin Functions

Pin Function

LC Loop Current Input. Signal from phone line to be monitored for dial pulse signaling and hook status. Active low,

internally pulled high.

OH Off-hook Output. Hook status of phone line. Active (off-hook) high.

10/20 Pulse Speed Input. Low for 10 pulse per second, high for 20 pulse per second. Internally pulled low.

D3-D0 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

OE Output Enable Input. Active high, a log low tri-states D3 through D0 outputs. Internally pulled high.

XIN Crystal Oscillator Input

XOUT Crystal Oscillator Output.

Clear Strobe Control Input. Momentary high during digit valid time resets STROBE latch output low until next valid

digit is received. Internally pulled low.

Strobe Digit Valid Output. Indicates valid digit data present on D3 through D0. Active high.

M-959

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3

Rev. 3

Timing Diagram

Tolerances

Inches Metric (mm)

Min Max Min Max
A .210 5.33
A1 .015 .38
b .014 .022 .36 .56
b2 .045 .070 1.14 1.78
C .008 .014 .20 .36
D .735 .775 18.67 19.70
E .300 .325 7.62 8.26
E1 .240 .280 6.10 7.1

e 100 BSC 2.54 BSC
ec 0˚ 15˚ 0˚ 15˚
L .115 .150 2.92 3.81

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4

M-959

Rev. 3

Dimensions

mm

(inches)

Mechanical Dimensions

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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-M959-R3
©Copyright 2001, Clare, Inc.
All rights reserved. Printed in USA.
7/20/01