FEATURES

■ Selectable Loop-disconnect (Pulse) or DTMF (Tone) dialling modes

■ 10 x 24 Digit Repertory Dialling Stores

■ 24 Digit Last Number Redial (LNR)

■ Selectable Interdigit Pause (IDP) 500ms or 800ms

■ Operates with inexpensive single contact keypad

■ On-chip Darlington transistor pair for DTMF tone filtering

■ Low power CMOS technology enables direct operation from Telephone line

■ Keypad switchable Loop-Disconnect to DTMF during a call

■ Selectable Break:Make Ratios 2:1 or 3:2

■ Uses inexpensive 560KHz ceramic resonator

■ Earth Loop Recall and Timed Break Recall (Timed Flash)

■ Low on-hook Supply Current Options SA54X53 - 5µA @ 2.5V SA54X56 - 1µA @ 2.5V SA54X59 - 1µA @ 3.0V

■ Call, barring/locking feature available on the SA54L5

■ Optional use of external capacitor for oscillator