NTE1691 & NTE1692 Integrated Circuit Telephone Pulse Dialer w/Redial Description: The NTE1691 and NTE1692 are monolithic CMOS integrated circuits in an 18–Lead DIP type package that provide all the features required for implementing a pulse dialer with redial. Functions: D Mute Output Logic “0” D Pulse Output Logic “0” D RC Oscillation for Reference Frequency D Designed to Operate Directly from the Telephone Line D Used CMOS Technology for Low Voltage, Low Power Operation D Power Up Clear Circuitry D NTE1691 Pin2: VREF D NTE1692 Pin2: Tone Out Features: D Uses Either a Standard 2 of 7 Matrix Keyboard with Negative True Common or the Inexpensive Form A–Type Keyboard D Make/Break Ratio Can Be Selected D Redial with * or # D Tone Signal Output or On–Chip Reference Voltage by Bonding Option on Chip D 10pps/20pps Can be Selected Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2V Voltage on Any Pin, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC+0.3, GND–0.3V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +60°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C DC Electrical Characteristics: (TA = +25°C, Note 1 unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 2.5 – 6.0 V Supply Voltage VCC Key Contact Resistance RKI Note 2 – – 1 kΩ Keyboard Capacitance CKI Note 2 – – 30 pF Key Input Voltage KIH 2 of 7 input mode, Note 2 0.8VCC – VCC V GND – 0.2VCC V KIL Key Pull–Up Resistance KIRU VCC = 6V – 100 – kΩ Key Pull–Down Resistance KIRD VIN = 4.8V – 4.0 – kΩ Mute Sink Current IM VCC = 2.5V, VO = 500mV, Note 3 500 – – µA Pulse Output Sink Current IP VCC = 2.5V, VO = 500mV, Note 4 1.0 – – mA Tone Output Sink Current ITL VCC = 2.5V, VO = 500mV, Note 5 250 – – µA Tone Output Source Current ITH VCC = 2.5V, VO = 500mV, Note 5 250 – – µA Memory Retention Current IMR All outputs under no load, Note 7 – 0.7 – µA Operating Current IOP All outputs under no load – 100 150 µA Mute or Pulse Off Leakage ILKG VCC = 6V, VO = 6V, Note 3, Note 4 – 0.001 1.0 µA VREF Output Source Current IREF Note 6 1.0 7.0 – mA Note Note Note Note Note Note Note 1. 2. 3. 4. 5. 6. 7. Typical values are to be used as a design aid and are not subject to production testing. Applies to key input pin (R1–R4, C1–C3). Applies to MUTE output pin. Applies to PULSE output pin. Applies to TONE pin (NTE1692 only). Applies to VREF pin (NTE1691 only). Current necessary for memory to be maintained. All outputs unloaded. AC Electrical Characteristics: (TA = +25°C, unless otherwise specified) Parameter Oscillator Frequency Symbol FOSC Test Conditions Min Typ Max Unit Note 8 – 4 – kHz Key Input Debounce Time TDB Note 10, Note 11 – 10 – ms Key Down Time for Valid Entry TKD Note 11, Note 12 40 – – ms Key Down Time During Two–Key Roll Over tKR Note 11 5 – – ms Oscillator Start–Up Time tos VCC = 2.5V – 1 – ms Mute Valid After Last Outpulses tMO Note 10, Note 11 – 5 – ms Pulse Output Pulse Rate PR Note 9 – 10 – PPS On–Hook Time Required to Clear Memory tOH Note 11 300 – – ms Pre–Digital Pause TPDP Note 10, Note 11 – 800 – ms Inter–Digital Pause TIDP Note 10, Note 11 – 800 – ms Frequency Stability ∆f VCC = 2.5 to 3.5V – ±4 – % VCC = 2.5 to 6.0V – ±4 – % Note 11, Note 13 – 1 – kHz Tone Output Frequency Note 8. Note 9. Note10. Note 11. Note12. Note13. FTONE RS = 2MΩ, R = 220kΩ, C = 390pF. If Pin10 is tied to VCC, the output pulse rate will be 20pps. If the 20pps option is selected, the time will be 1/2 these shown. These times are directly proportional to the oscillator frequency. Debounce plus oscillator start–up time ≤ 40ms. If the 20pps option is selected, the tone output frequency will be 2kHz (NTE1692 only). Pin Connection Diagram NTE1691 VCC 1 Vref 2 NTE1692 18 Pulse Output 17 On–Hook/Test VCC 1 18 Pulse Output 17 On–Hook/Test Pacifier Tone 2 Column 1 3 16 Row 1 Column 1 3 16 Row 1 Column 2 4 15 Row 2 Column 2 4 15 Row 2 Column 3 5 14 Row 3 Column 3 5 14 Row 3 GND 6 13 Row 4 GND 6 13 Row 4 RC OSC 7 12 Mute Output RC OSC 7 12 Mute Output RC OSC 8 11 Make/Break Select RC OSC 8 11 Make/Break Select RC OSC 9 10 10/20 PPS Select RC OSC 9 10 10/20 PPS Select 18 10 1 9 .870 (22.1) Max .250 (6.35) .150 (3.8) .100 (2.54) .800 (20.3) .125 (3.17) Min