HT9200A/HT9200B Revision # 1.50 DTMF Generators Modifications made on April 29, 2013 The Tone frequency table was modified. Revision # 1.41 Modifications made on February 23, 2009 The Package Information section was modified. The Product Tape and Reel Specifications section was modified. Revision # 1.40 Modifications made on August 30, 2004 At the Pin Description section, the Pull-high Internal Connection for the CE pin was deleted and its Description was modified. Revision # 1.30 Modifications made on July 18, 2003 A the Features section, Selection Table and other related sections, the Operating voltage range was changed from 2.0V~5.5V to 2.5V~5.5V. Revision # 1.20 Package Information section was added. Revision # 1.10 Modifications made on September 30, 2002 Modifications made on February 13, 2001 The 14-pin DIP package of HT9200B was deleted from the Selection Table, the Pin Assignment section and from the serial/parallel mode Application Circuits.