SA545
Keypad
Nominal frequency (Hz)
Deviation from nominal (%)
-,22
R1
697
R2
770
-,07
R3
852
-,10
R4
941
+,19
C1
1209
-,15
C2
-,17
C3
-,20
1336 1477
There will be an additional error due to any deviation in the oscillator frequency from 560
kHz.
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.
Ordering Information
SA54X5X/X
Lock Option
L : with (22 pin package)
Blank : without (20 pin package)
On-Hook Current Option
3 :
5µA @ 2.5V
6 :
1µA @ 2.5V
9 :
1µA @ 3V
Blank :
/1 :
4/18
MF Digits dialled after */# not stored
All MF digits stored
sames
SAMES [ SAMES ]
