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W91820ALN Dataheets PDF



Part Number W91820ALN
Manufacturers Winbond
Logo Winbond
Description 13-MEMORY TONE/PULSE DIALER WITH HANDFREE/ LOCK AND HOLD FUNCTIONS
Datasheet W91820ALN DatasheetW91820ALN Datasheet (PDF)

W91820N SERIES 13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS GENERAL DESCRIPTION The W91820N is a series of tone/pulse switchable telephone dialers with 13 memory, keytone, hold, lock, and handfree dialing control features. These chips are fabricated using Winbond's highperformance CMOS technology and thus offer good performance in low-voltage, low-power operations. FEATURES • • • • • • • • • • • • • • • • • • • • • • Tone/pulse switchable dialer Two by 32 digits redial an.

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W91820N SERIES 13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS GENERAL DESCRIPTION The W91820N is a series of tone/pulse switchable telephone dialers with 13 memory, keytone, hold, lock, and handfree dialing control features. These chips are fabricated using Winbond's highperformance CMOS technology and thus offer good performance in low-voltage, low-power operations. FEATURES • • • • • • • • • • • • • • • • • • • • • • Tone/pulse switchable dialer Two by 32 digits redial and save memory Three by 32 digits one-touch direct repertory memory Ten by 32 digits two-touch indirect repertory memory Pulse-to-tone (*/T) keypad for long distance call operation Chain dialing Uses 5 × 5 keyboard Easy operation with redial, flash, pause, and */T keypads Pause, P→T (pulse-to-tone) can be stored as a digit in memory Dialing rate:10 ppS or 20 ppS by mask option Minimum tone output duration: 93 mS (unless W91824N/AN is 87 mS) Minimum intertone pause: 93 mS (unless W91824N/AN is 87mS) Pause time: 3.6 sec. (unless W91824N/AN is 2.0 sec.) Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0 S Make/break ratio (2:3 or 1:2) selectable by MODE pin Mute key for speech network mute No key will be accepted except the "HOLD" key when in the Hold mode Key tone output for valid keypad entry recognition On-chip power-on reset Uses 3.579545 MHz crystal or ceramic resonator 20, or 22-pin dual-in-line plastic package The different dialers in the W91820N series are shown in the following table: TYPE NO. W91820N/824N W91820AN/824AN W91820LN W91820ALN W91822N W91822AN PULSE (ppS) 10 10 10 10 20 20 LOCK √ √ KEY TONE √ √ √ √ HANDFREE DIALING √ √ √ PACKAGE (PINS) 20 22 20 22 20 22 Note: W91824N/824AN for French only. -1- Publication Release Date: May 1999 Revision A2 W91820N SERIES PIN CONFIGURATIONS C1 C1 C2 C3 C4 KT H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS C2 C3 C4 KT H/P MUTE VSS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS HFO W91820N/822N /824N W91820AN/822AN /824AN C1 C1 C2 C3 C4 LOCK H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS C2 C3 C4 LOCK H/P MUTE VSS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS HFO W91820LN W91820ALN -2- W91820N SERIES PIN DESCRIPTION SYMBOL ColumnRow Inputs 20-PIN 1−4 & 17−20 22-PIN 1−4 & 19−22 I/O I FUNCTION The keyboard input is compatible with a standard 5 × 5 keyboard, an inexpensive single contact (Form A) keyboard, and electronic input. In normal operation, any single button can be pushed to produce dual tone, pulses, or functions. Activation of two or more buttons will result in no response except for a single tone. XT 8 8 I A built-in inverter together with an inexpensive 3.579545 MHz crystal supplies the oscillator. The oscillator stops when there is no keypad input. The crystal frequency deviation is 0.02%. Crystal oscillator output pin. The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor turns on with a low level during a dialing sequence (both pulse and tone mode). Otherwise, it is off. N.C. MODE 16 14 18 16 I No connect Connecting the mode pin to VSS places the dialer in tone mode. Connecting the mode pin to VDD places the dialer in pulse mode with an M/B ratio of 40:60. Leaving the mode pin floating places the dialer in pulse mode with an M/B ratio of 33.3:66.7. HKS 11 13 I The HKS (hook switch) input is used to sense whether the handset is on-hook or off-hook. In on-hook state, HKS = 1: chip is in sleeping mode, no operation. In off-hook state, HKS = 0: chip is enabled for normal operation. HKS pin is pulled to VDD by internal resistor. KT (W91820N/8 20AN/822N/ 824N/822AN /824AN only) XT T/P MUTE 9 10 9 10 O O 5 5 O The key tone output is a conventional CMOS inverter. The key tone is generated when any valid key is pressed; the KT pin generates a 1.2 KHz square wave at 35 mS. When no key is pressed, the KT pin remains in low state. -3- Publication Release Date: May 1999 Revision A2 W91820N SERIES Pin Description, continued SYMBOL LOCK (W91820LN/ 820ALN only) 20-PIN 5 22-PIN 5 I/O I FUNCTION The function of this terminal is to prevent "0" dialing and "9" dialing under PABX system long distance call control. When the first key input after reset is 0 or 9, all key inputs, including the 0 or 9 key, become invalid and the chip generates no output. The telephone is reinitialized by a reset. The function of the LOCK pin is shown below: LOCK PIN VDD Floating VSS FUNCTION "0", "9" dialing inhibited Normal dialing Mode "0" dialing inhibited H/P MUTE 6 6 I The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or hold period, this output is active high; otherwise, it remains.


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