SA545

SA545 sames FEATURES s SA545, SA54L5 PULSE/DTMF SWITCHABLE DIALLERS WITH 10 REPERTORY MEMORIES 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 s s s s 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 s s s s s s s s s Keypad switchable Loop-Disconnect to DTMF during a call PIN CONNECTIONS: SA545 PIN CONNECTIONS: SA54L5 M63-1961 sames 1/18 PDS039-SA545-001 REV. B 31-08-94 SA545 ABSOLUTE MAXIMUM RATINGS * Parameter Min Typ Max 6,5 VDD +0,3 1 0,1 0 70 125 Unit V V V mA mA mA °C °C Notes Supply Voltage VDD - VSS -0,3 Voltage on any pin (except HSW) VSS -0,3 Voltage on pin HSW VSS -0,3 Current at any pin -1 (except HSW, FILTOUT and FILTIN) Current at pin FILTOUT 0 Current at pin FILTIN -5 Operating Temperature -25 Storage Temperature -55 See Note 1 * Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This a stress...