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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 = +25C 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 +60C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C
DC Electrical Characteristics: (TA = +25C, Note 1 unless otherwise specified)
Parameter Supply Voltage Key Contact Resistance Keyboard Capacitance Key Input Voltage Key Pull-Up Resistance Key Pull-Down Resistance Mute Sink Current Pulse Output Sink Current Tone Output Sink Current Tone Output Source Current Memory Retention Current Operating Current Mute or Pulse Off Leakage VREF Output Source Current Symbol VCC RKI CKI KIH KIL KIRU KIRD IM IP ITL ITH IMR IOP ILKG IREF VCC = 6V VIN = 4.8V VCC = 2.5V, VO = 500mV, Note 3 VCC = 2.5V, VO = 500mV, Note 4 VCC = 2.5V, VO = 500mV, Note 5 VCC = 2.5V, VO = 500mV, Note 5 All outputs under no load, Note 7 All outputs under no load VCC = 6V, VO = 6V, Note 3, Note 4 Note 6 Note 2 Note 2 2 of 7 input mode, Note 2 Test Conditions Min 2.5 - - 0.8VCC GND - - 500 1.0 250 250 - - - 1.0 Typ - - - - - 100 4.0 - - - - 0.7 100 0.001 7.0 Max 6.0 1 30 VCC 0.2VCC - - - - - - - 150 1.0 - Unit V k pF V V k k A mA A A A A A 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.
Parameter Symbol FOSC TDB TKD tKR tos tMO PR tOH TPDP TIDP f FTONE Test Conditions Note 8 Note 10, Note 11 Note 11, Note 12 Note 11 VCC = 2.5V Note 10, Note 11 Note 9 Note 11 Note 10, Note 11 Note 10, Note 11 VCC = 2.5 to 3.5V VCC = 2.5 to 6.0V Note 11, Note 13 Min - - 40 5 - - - 300 - - - - - Typ 4 10 - - 1 5 10 - 800 800 4 4 1 Max - - - - - - - - - - - - - Unit kHz ms ms ms ms ms PPS ms ms ms % % kHz
AC Electrical Characteristics: (TA = +25C, unless otherwise specified)
Oscillator Frequency Key Input Debounce Time Key Down Time for Valid Entry Key Down Time During Two-Key Roll Over Oscillator Start-Up Time Mute Valid After Last Outpulses Pulse Output Pulse Rate On-Hook Time Required to Clear Memory Pre-Digital Pause Inter-Digital Pause Frequency Stability Tone Output Frequency
Note 8. Note 9. Note10. Note 11. Note12. Note13.
RS = 2M, R = 220k, 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 NTE1692
VCC 1 Vref 2 Column 1 3 Column 2 4 Column 3 5 GND 6 RC OSC 7 RC OSC 8 RC OSC 9
18 Pulse Output 17 On-Hook/Test 16 Row 1 15 Row 2 14 Row 3 13 Row 4 12 Mute Output 11 Make/Break Select 10 10/20 PPS Select
VCC 1 Pacifier Tone 2 Column 1 3 Column 2 4 Column 3 5 GND 6 RC OSC 7 RC OSC 8 RC OSC 9
18 Pulse Output 17 On-Hook/Test 16 Row 1 15 Row 2 14 Row 3 13 Row 4 12 Mute Output 11 Make/Break Select 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

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