GENERAL DESCRIPTION
The W91590 series dialers Si-gate CMOS IC tone/pulse switchable dialers with a 24-channel automatic dialing memory, including a 16-digit ´ 3 emergency dialing memory, a 16-digit ´ 20 channel repertory memory that provides one-touch and three-touch dialing, and a 32-digit mercury memory. These dialers also provide flash, clear, hold, and one-key redial functions.

FEATURES
• DTMF/Pulse switchable dialer
• 32-digit LNB (last number buffer) memory (both tone and pulse mode)
• 32-digit mercury memory (tone/pulse mode)
• 16-digit x 3 one-touch direct repertory memory (tone/pulse mode)
• 16-digit x 20 direct or indirect repertory memory (tone/pulse mode)
• Uses 9 ´ 5 keyboard
• Flash time: 98 mS, 305 mS, or 600 mS (selectable by keypad option)
• Pause time: 3.6 sec.
• Pause P®T (pulse-to-tone) can be stored as a digit in memory
• Minimum tone output duration: 93 mS
• Minimum intertone pause: 93 mS
• On-chip power-on reset
• Uses 3.579545 MHz crystal or ceramic resonator
• Packaged in 22, 24 or 28-pin plastic DIP