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W91473D Datasheet(PDF) 3 Page - Winbond |
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W91473D Datasheet(HTML) 3 Page - Winbond |
3 / 20 page W91473 SERIES Publication Release Date: February 1995 - 3 - Revision A3 PIN DESCRIPTION SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION Column- Row Inputs 1 −7 & 18 −22 1 −7 & 20 −24 1 −8 & 24 −28 I The keyboard input may be used with either the standard 7 × 5 keyboard or an inexpensive single contact (form A) keyboard. Electronic input with µC can also be used. A valid key entry is defined by a single row being connected to a single column. XT, XT 9, 10 9, 10 11, 12 I, O A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal or ceramic resonator. T/P MUTE 11 11 13 O The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor is switched on during pulse and tone mode dialing sequence and flash break. Otherwise, it is switched off. DP 13 15 17 O N-channel open drain dialing pulse output (Figure 1). Flash key causes DP to go active when in pulse mode and tone mode. MODE 15 17 19 I Pulling mode pin to VSS places the dialer in tone mode. Pulling mode pin to VDD places the dialer in pulse mode (10 ppS, M/B = 2:3). Leaving mode pin floating places the dialer in pulse mode (10 ppS, M/B = 1:2). HKS 12 14 16 I Hook switch input. HKS = 1: On-hook state. Chip in sleep mode, no operation. HKS = 0: Off-hook state. Chip enabled for normal operation. HKS pin is pulled to VDD by internal resistor. |
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