Description

The EM91421BK is a series of tone/pulse switchable dialers designed for application in any environment. It provides necessary functions of a telephone set, including pulse and tone (DTMF) dialing, handfree dialing, keying tone, and lock functions.

Specifications and features

• Tone/pulse switchable
• Wide operating voltage from 2.0 V to 5.5 V
• Low operating current, 0.15 mA (Pulse) and 0.3 mA (Tone) typically
• Various telephone specifications, such as pulse rate, M/B ratio, flash time, lock dialing functions can be selected by adding a resistor on the keyboard scan pin
• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers
• Line hold function for stopping conversation temporality
• Melody generator provides music on hold function
• Lock function provides key lock and password lock operations
• Ring detector to prevent illegal dialing from pocket dialer
• 20-set three touch repertory memory, each one can hold data up to 16 digits
• 32-digit LNB (last number) redial memory
• Keytone function provides rapidly keying recognition
• Handfree function provides on-hook dialing and speakerphone application
• Pause and P-T time are fixed to 3.6 seconds
• Tone duration and inter-tone pause time are fixed to 98 ms
• Using 3.579545 MHz crystal or ceramic resonator
• Package forms available: PDIP, skinny

Application Scenarios

The EM91421BK can be used in various telephone applications, both in residential and commercial environments. It is suitable for creating custom telephony solutions and integrating into different systems.

Comparison

• Tone and pulse switchable
• Wide operating voltage range
• Low operating current
• Flexible selection of telephone specifications
• Supports LCD driver and voice synthesizer
• Line hold and music on hold functions
• Key lock and password lock operations
• Prevents illegal dialing
• Ample memory for storing numbers
• Rapid keying recognition
• Supports on-hook dialing and speakerphone application

• Some functions have fixed durations and pause times
• Requires specific crystal or ceramic resonator
• Available in limited package forms