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Novatek NT91214 Series Manual

Tone/pulse dialer
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Features
T
One touch redial operation
T
Tone/Pulse switchable
T
32 digit capacity for redialing
T
Automatic mixed redialing (last number redial) of pulse
to DTMF with multiple automatic access pauses
T
PABX auto-pause is 2.2 seconds
T
DTMF Timing:
Manual dialing: minimum duration for bursts and
pauses
Redialing: calibrated timing
T
Hands-Free control function
General Description
The NT91214/15 is a single-chip, silicon gate, CMOS
integrated circuit with an on-chip oscillator for a 3.58MHz
crystal or ceramic resonator. It provides a dialing pulse
(DP) or dual tone multi-frequency (DTMF) dialing. A
standard 4 x 4 matrix keyboard can be used to support
either DP or DTMF modes.
Pin Configurations
a. 16-Pin Package
b. 18-Pin Packages
(i) Key Tone Output
1
NT91214/15 Series
T
Wide operating voltage range: 2V to 5.5V
T
Key-in beep tone output
T
Digits dialed manually after redialing are cascadable
and stored as additional digits for the next redialing
T
Uses inexpensive ceramic resonator (3.58 MHz)
T
Two versions for different telephone systems
T
Built-in power up reset circuit
T
Four extra function keys: flash, pause, redial and DP
or
DTMF mixed dialing
T
4 x 4 (or 2 x 8) keyboard can be used
T
Low standby current
Up to 32 digits can be saved in the on-chip RAM for
redialing. In the DTMF mode, a short minimum tone
duration and minimum intertone pause allows rapid
dialing. Maximum tone duration depends on the key
depression time during manual dialing.
(ii) Hands-Free Control
Tone/Pulse Dialer
c. 20-Pin Package
V1.0

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Summary of Contents for Novatek NT91214 Series

  • Page 1 NT91214/15 Series Tone/Pulse Dialer Features One touch redial operation Wide operating voltage range: 2V to 5.5V Tone/Pulse switchable Key-in beep tone output 32 digit capacity for redialing Digits dialed manually after redialing are cascadable Automatic mixed redialing (last number redial) of pulse and stored as additional digits for the next redialing to DTMF with multiple automatic access pauses Uses inexpensive ceramic resonator (3.58 MHz)

  • Page 2: Block Diagram

    NT91214/15 Series Keyboard Assignments 1. */T -- In PULSE mode this key works as Pulse → DTMF key (T key). In DTMF mode the key works as * key. */T key will occupy one memory digit in either use. 2. F1 -- Flash key. The break time is 297 ms or 96 ms (NT91214/15 respectively) 3.

  • Page 3: Absolute Maximum Ratings

    NT91214/15 Series Absolute Maximum Ratings* *Comments Stresses above those listed under "Absolute Maximum Supply Voltage (VDD)....≤ 6.0V Ratings" may cause permanent damage to this device. Input Voltage (V ) .
  • Page 4 NT91214/15 Series DC Electrical Characteristics (continued) Test Parameter Symbol Min. Typ. Max. Unit Conditions VDD = 3.5V I  HFO Drive Current VDD - 0.4V OH = HFO, KT , MODEOUT VDD = 3.5V XMITMUTE Sink Current 0.4V OL = DP Sink Current VDD = 3.5V , V 0.4V...
  • Page 5 NT91214/15 Series AC Characteristics (continued) Parameter Symbol Min. Typ. Max. Unit Conditions Auto-redial Break Time * Optional AOBK Delay time Key valid to Signal Out Key-in Debounce Key Release Debounce Time Key-in Tone Duration Key-in Tone Frequency Minimum Tone Duration Time Min.

  • Page 6: Pin Descriptions

    NT91215 Series is for European and American systems. MODE Tone/ Dial Pulse Rate Ratio Pulse 10pps Tone Floating Pulse 10pps b. The NT91214 Series is for the Japanese system. MODE Tone/ Dial Pulse Rate Ratio Pulse 10pps Tone Floating Pulse 20pps...
  • Page 7 NT91214/15 Series Pin Descriptions (continued) Pin No. Designation Description NT91215A NT91215B NT91215C NT91215D NT91214A NT91214B NT91214C NT91214D Hook switch input This inverter input pin detects the state of the hook switch contact. "Off Hook" is represented by a VSS condition. "On Hook"...
  • Page 8 NT91214/15 Series Pin Descriptions (continued) Pin No. Designation Description NT91215A NT91215B NT91215C NT91215D NT91214A NT91214B NT91214C NT91214D Hands-Free Control I/O pins These pins enable and disable the Hands- Free control function. When input pin HFI goes low, the Hands-Free Control state is toggled on.
  • Page 9 NT91214/15 Series Pin Descriptions (continued) Pin No. Designation Description NT91215A NT91215B NT91215C NT91215D NT91214A NT91214B NT91214C NT91214D XMITMUTE Dialing transmission mute output This is an N-channel open drain output The XMITMUTE is normally "OFF" During pulse of DTMF dialing this output is "ON".

  • Page 10: Operating Procedures

    NT91214/15 Series Operating Procedures Symbol Definitions: In the description below, signals are defined in terms of HFI ↓ the key or switch which is activated. b. On Hook D1 . . . Dn OFF Hook means the phone is off the hook. Pulse mode is defined as the INITIAL mode, provided On Hook means that the phone is on the hook.
  • Page 11 NT91214/15 Series as the first key pressed, will not produce any pause time. There are only 31 digits of redial memory available in the buffer to be used for operations a and b, since the mode switching key, */T , will occupy one digit of space.
  • Page 12 NT91214/15 Series 3. Manual dialing with automatic access pause The mode selection pin is alwsys checked for TONE a. Off Hook D1 . . . or PULSE mode key entry. Dialing can be switched pause key entries can be accepted and stored in the from PULSE to TONE mode, but not from TONE to redial memory.
  • Page 13 NT91214/15 Series above switching modes can store as many as 31 digits in the redial memory. V1.0...

  • Page 14: Timing Waveforms

    NT91214/15 Series 6. One-key redialing break of 96 ms or 640 ms (or, 297 ms or 640 ms, HFI ↓ Off Hook D1 . . . Dn RD or On Hook depending on the model) on the DP output pin. Then, it D1 .
  • Page 15 NT91214/15 Series Timing Waveforms (continued) 2. Timing Waveform in TONE Mode: (i) Normal Dialing H K o r H F O K e y I n p u t X M I T M U T E T M F D : 9 4 m s 2 .
  • Page 16 NT91214/15 Series Timing Waveforms (continued) 3. Timing waveform for SWITCHING Mode Operation: (i) By mode selection pin switches H K o r H F O Key Input M O D E I N **** **** ******************* M O D E O U T X M I T M U T E T O N E (ii) By */T key entry...
  • Page 17 NT91214/15 Series Timing Waveforms(continued) 4. One Key Redial (DTMF mode used as example): H K o r H F O K e y I n p u t X M I T M U T E A O B K 2 .

  • Page 18: Application Circuit

    NT91214/15 Series Application Circuit (for reference only) ÉÐÐÌ ÔØÊÕÄÉ ³³Î ÕÊÑ ÐÏ ÉÐÐÌ Âº³ ÐÇÇ ÉÐÐÌ ²Ì º³ ²±±Ì ô ÓÊÏÈ ¬ ¬ ³±± µ Ç µ¸ Ç ÛÏÓ ³³±× ´¯º× ® ® ²±±Ì ³Î ÐÏ ÉÐÐÌ ²±Ì ÐÇÇ ÉÐÐÌ ³¸±Ì...

  • Page 19: Test Circuits

    NT91214/15 Series Test Circuits OSCILLOSCOPE: TEKTRONI X 468 SPECTURM ANALYZER: HP3585A V1.0...

  • Page 20: Ordering Information

    NT91214/15 Series Ordering Information Flash Part No. Key Tone Hands-Free Dial Rate M/B Ratio Package Control NT91214A N.A. N.A. 16L DIP NT91214B N.A. 18L DIP 10/20pps 297 ms 640 ms NT91214C N.A. 18L DIP NT91214D 20L DIP NT91215A N.A. N.A. 16L DIP NT91215B N.A.
  • Page 21 NT91214/15 Series Package Information DIP 16L Outline Dimensions unit: inches/mm B a s e P l a n e S e a t i n g P l a n e α Symbol Dimensions in inches Dimensions in mm 0.175 Max. 4.45 Max.
  • Page 22 NT91214/15 Series Package Information DIP 18L Outline Dimensions unit: inches/mm B a s e P l a n e S e a t i n g P l a n e α Symbol Dimensions in inches Dimension in mm 0.175 Max. 4.45 Max.
  • Page 23 NT91214/15 Series Package Information DIP 20L Outline Dimensions unit: inches/mm B a s e P l a n e S e a t i n g P l a n e α Symbol Dimensions in inches Dimensions in mm 0.175 Max. 4.45 Max.

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