Document
Preliminary W91F820N SERIES
13-FLASH MEMORY TON/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS
GENERAL DESCRIPTION
The W91F820N is a series of tone/pulse switchable telephone dialers with 13-flash 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 flash memory Ten by 32 digits one-touch direct or two-touch indirect repertory flash memory The read-write times: 104 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 Minimum intertone pause: 93 mS Pause time: 3.6 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-pin 300 mil, or 22-pin 400 mil dual-in-line plastic package • The different dialers in the W91F820N series are shown in the following table: TYPE NO. W91F820N W91F820AN W91F820LN W91F820ALN W91F822N W91F822AN PULSE (PPS) 10 10 10 10 20 20 LOCK √ √ KEY TONE √ √ √ √ HANDFREE DIALING √ √ √ PACKAGE (PINS) 20 22 20 22 20 22
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Publication Release Date: January 1999 Revision A1
Preliminary W91F820N 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. V DD MODE DTMF DP HKS C2 C3 C4 KT H/P MUTE V SS 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
W91F820N/822N
W91F820AN/822AN
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. V DD MODE DTMF DP HKS HFO
W91F820LN
W91F820ALN
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Preliminary W91F820N SERIES
PIN DESCRIPTION
SYMBOL 20-PIN Column1−4 Row Inputs & 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. 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. 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. 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. KT
(W91F820N/ F820AN/ F822N)
XT
8
8
I
XT T/P MUTE
9 10
9 10
O O
N.C. MODE
16 14
18 16
I
HKS
11
13
I
5
5
O
LOCK
(W91F820LN/ 820ALN only)
5
5
I
HKS pin is pulled to VDD by internal resistor. 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. 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 V DD Floating V SS FUNCTION "0", "9" dialing inhibited Normal dialing Mode "0" dialing inhibited
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Publication Release Date: January 1999 Revision A1
Preliminary W91F820N SERIES
Pin Description, continued
SYM. H/P MUTE
20-PIN 22-PIN I/O 6 6 I
FUNCTION The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or hold period, this output is active high; otherwise, it re.