W91F820AN Datasheet PDF - Winbond Electronics

●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 high performance 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