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Part: M-959
Category:
Communication
-> Telephony
-> Tone Receiver
Description: Dial Pulse Counter And Hook Status Monitor
Company: Clare, Inc.
Datasheet: Download M-959 datasheet File size : 875 kB
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Datasheet text preview:
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 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.
Pin Diagram
Ordering Information Part # M-959 Description 14-pin plastic DIP
Block Diagram
DS-M959-R3
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1
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 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.
Absolute Maximum Ratings
DC Supply Voltage Any Input Voltage Relative to VDD Any Input Voltage Relative to VSS Operating Temperature Range Storage Temperature Range 6.0 V +0.3 V -0.3 V -40°C to +85°C -55°C to + 125°C
* Exceeding these ratings may permanently damage the M-959.
Specifications
VDD - VSS = 2.5 through 6.0 V unless otherwise noted. Parameter Signal Timing Break Recognition Spurious Break Rejection Make Recognition Interdigit Time (IDT) Off-hook Delay On-hook Delay LC Hysteresis EOD (End of Digit) Recognition STROBE Active Data Change Before Logic Input Input Voltages Requirements Input Current Pull Up/Down Resistance Logic Output Output Voltages Characteristics Output Currents Conditions 10 PPS 20 PPS 10 PPS 20 PPS 10 PPS 20 PPS 10 PPS 20 PPS 10 PPS 20 PPS Logic 0 Logic 1 Logic 0 Logic 1 Vout = 2.5V Vout = 4.6V Vout = 0.4V Min 45 30 0 30 15 285 142.5 95 285 1 95 47.5 190 95 1.0 0.0 3.5 0.0 4.5 -2.1 -0.44 0.44 Typ 300 150 100 300 1.5 100 50 200 100 1.5 2.25 2.75 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
Power Requirement
Notes: 1. VDD - VSS = 5.0V
Tri-State Leakage Supply Current
-4.2 -0.88 0.88
1, 4 1, 3 1 1 1
2. Maximimum is 30% of VDD - VSS 3. Minimum is 70% of VDD - VSS 4. No load. 5. Typical column for reference only.
2
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Rev. 3
M-959
Pin Functions
Pin LC OH 10/20 D3-D0 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 1 0 0 0 1 2 0 0 1 0 3 0 0 1 1 4 0 1 0 0 5 0 1 0 1 6 0 1 1 0 7 0 1 1 1 8 1 0 0 0 9 1 0 0 1 0 1 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.
OE XIN XOUT Clear Strobe
Timing Diagram
Rev. 3
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3
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