HT9205D

HT9205A/B/C/D/K 5-Memory/6-Memory Tone/Pulse Dialer Features Universal specification Operating voltage: 2.0V~5.5V Low stand-by current Low memory retention current: 0.1µA (Typ.) Tone/pulse switchable Interface with LCD driver 32 digits for redialing 32 digits for the SA memory dialing One-key redialing Pause and P→T key for PBX 4×5 keyboard matrix 3.58MHz crystal or ceramic resonator Hand-free control Hold-line control Pause, P→T can be saved for redialing Resistor options: – M/B ratio – Flash function and flash time – Pause and P→T duration – Pulse number – Keyboard form Memory number: – HT9205A/B/C/D: 5 memories – HT9205K: 6 memories General Description The HT9205 series tone/pulse dialers are CMOS LSIs for the telecommunication system. They are designed to meet various dialing specifications through resistor options matrix. The HT9205 series tone/pulse dialers are offered in various packages from 18 DIP to 24 SDIP. The 18 DIP version is suitable for low cost applications, while the 24 SDIP version supplies versatile functions such as: Hold-line, Hand-free and LCD dialing number display interface, all of which are suitable for feature phone applications. Selection Table 1 16th June ’95 Package Information HT9205A/B/C/D/K 2 16th June ’95 Keyboard Information HT9205A/B/C/D/K Block Diagram 3 16th June ’95 HT9205A/B/C/D/K Pin Description Pin Name C1~C5 R1~R4 X1 X2 XMUTE HKS PO I/O Internal Connection Description These pins co...