HT93214 Series -- 1-memory Tone/Pulse Dialer

General Description

The HT93214 are dialer series designed for low cost telephone set applications with expandable features such as Lock function, keytone and LCD display interface. With a 4x4 keyboard, it performs normal tone/pulse switchable dialing, and provides one-key redialing function with a 32-digit memory for speed dialing. An on-chip oscillator is built-in to work with an external 3.58MHz crystal or ceramic resonator for accurate timing. The HT93214 provides 300ms (F1 key) and 600ms (F2 key) of flash time; Tone dialing and 10pps, 20pps selection with 1/2 M/B ratio for pulse dialing.

Features

  • Operating Voltage: 2.0V~5.5V
  • Low standby current
  • Low memory retention current: 0.1uA (Typ.)
  • Tone/Pulse switchable
  • 32 (pulse)/31 (tone) digits for redialing
  • Pause and P -> T key for PBX
  • 4x4 keyboard matrix
  • 3.58MHz crystal or ceramic resonator
  • Hand-free control
  • Pause, P -> T can be saved for redialing
  • One-key redialing
  • Keytone output
  • Pause time: 2.2s
  • Cascadable manual dialing after redialing
  • Calibrated DTMF timing for redialing
  • HT93214A: 16-pin DIP package
    HT93214B/AT: 18-pin DIP package

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