SA545 Sames, SA545 Datasheet - Page 4

• Manufacturer Part Number: SA545
• Description: PULSE/DTMF SWITCHABLE DIALLERS WITH 10 REPERTORY MEMORIES
• Manufacturer: Sames

-,22
There will be an additional error due to any deviation in the oscillator frequency from 560
kHz.
Ordering Information
Lock Option
On-Hook Current Option
FUNCTIONAL OVERVIEW
The SAMES SA545 is a family of keypad switchable Loop Disconnect (LD)/Dual Tone
multi-Frequency (DTMF) dialler devices for use in low-cost, dual dialling mode telephone
instruments.
The devices feature automatic storage of a single telephone number of up to 24 digits
for Last Number Redial (LNR) purposes as well as10 repertory dialling memories capable
of each storing 24 digits. The low current consumption of the SA545 ensures memory
retention while powered from the line.
Two modes of operation are available. The first is a LD/DTMF mode which operates
normally in LD mode, but can be switched temporarily via the keypad to DTMF mode
during a call. This mode has been optimised for applications such as home banking,
credit-card verification and other applications requiring low speed data communications.
The second mode allows DTMF dialling only.
The Lock function will be described in the Functional Description.
The SA545 family is pin compatible with SAMES SA541 family.
SA545
4/18
Nominal frequency (Hz)
Deviation from nominal (%)
Keypad
Blank :
L : with (22 pin package)
Blank : without (20 pin package)
3 :
6 :
9 :
/1 :
sames
5µA @ 2.5V
1µA @ 2.5V
1µA @ 3V
MF Digits dialled after */# not stored
All MF digits stored
697
R1
770
-,07
R2
852
-,10
R3
S A 5 4 X 5 X / X
+,19
941
R4
1209
-,15
C1
1336 1477
-,17
C2
C3
-,20