SAMES SA5459, SA5459-1, SA54L53, SA54L53-1, SA54L56 Datasheet
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SA545
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SA545, SA54L5
PULSE/DTMF SWITCHABLE DIALLERS WITH 10 REPERTORY
MEMORIES
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
PIN CONNECTIONS:
SA545
PIN CONNECTIONS:
SA54L5
M63-1961 PDS039-SA545-001 REV. B 31-08-94
■ 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
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SA545
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Supply Voltage VDD - V
SS
-0,3 6,5 V
Voltage on any pin (except HSW) VSS -0,3 VDD +0,3 V
Voltage on pin HSW VSS -0,3 V See Note 1
Current at any pin -1 1 mA
(except HSW, FILTOUT and FILTIN)
Current at pin FILTOUT 0 0,1 mA
Current at pin FILTIN -5 0 mA
Operating Temperature -25 70 °C
Storage Temperature -55 125 °C
* Stresses above those listed under "Absolute Maximum Ratings" may cause permanent
damage to the device. This a stress rating only. Functional operation of the device at
these or any other condition above those indicated in the operation sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.
Note 1: A diode is internally connected between this pin and VDD. Provided current is
externally limited to 300µA max, no damage will occur.
ABSOLUTE MAXIMUM RATINGS *
Parameter Min Typ Max Unit Notes
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SA545
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Condition Min Typ Max Unit Notes
Supply voltage: on-hook 1,8 5,7 V
For memory retention
off-hook 2,4 5,7 V
Hookswitch input: on-hook 0,2 V
DD
off-hook 0,8 V
DD
Supply Current: on-hook
SA54X53 <0.2 5 µA V
DD
= 2.5V
SA54X56 <0.2 1 µA V
DD
= 2.5V
SA54X59 <0.2 1 µA V
DD
= 3V
off-hook 1,5 µA If MF OUT is low
MF tone sending 1,0 mA
LD impulsing 200 µA
Output High Voltage 2,2 V I = -1mA
(MASK, MUTE and IMP Outputs)
Output Low Voltage 0,3 V I = +1mA
(MASK, MUTE and IMP Outputs)
MF OUT d.c. Level During Tone Sending 0,9V
DD
V
MF OUT Output Resistance 3 K
Ω
'Key Pressed' Resistance 2 KΩ 2,5V<VDD<5,7V
'Key Not Pressed' Resistance 500 K
Ω 2,5V<V
DD
<5,7V
Darlington Pair Current Gain 600 50,000 Ie=100µA,Vce=2V
DC ELECTRICAL CHARACTERISTICS
(VDD = 2,5V at 25°C, unless otherwise specified)
AC ELECTRICAL CHARACTERISTICS
(VDD = 2,5V at 25°C, unless otherwise specified)
Condition Min Typ Max Unit Notes
Oscillating Frequency 560 kHz
Tone Output: Low Group 68 77 mVrms No Load
High Group 97 109 mVrms No Load
High-to-Low Group Amplitude Ratio 1,5 2 2,5 dB at MF OUT
Total harmonic Distortion: 0-4KHz 1,5 %
0-10KHz 2,5 %
0-50KHz 5,0 %
0-200KHz 6,5 10 %
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SA545
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Keypad R1 R2 R3 R4 C1 C2 C3
Nominal frequency (Hz) 697 770 852 941 1209 1336 1477
Deviation from nominal (%) -,07 -,10 +,19 -,15 -,17 -,20
-,22
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 S A 5 4 X 5 X / 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 : MF Digits dialled after */# not stored
/1 : All MF digits stored
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SA545
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Block Diagram
Figure 1 depicts the SA545 block diagram, while Table 1 lists the respective pin functions
of the SA545 and SA54L5.
Figure 1: SA54X5 Block Diagram
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SA545
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SA545 SA54L5 Designation Description
10 10 V
DD
Positive Supply input
99V
SS
Negative Supply input
4 4 OSC OUT Connections for 560KHz ceramic resonator
5 5 OSC IN
12 14 MUTE Active high output during keying and tone transmission.
(See Note 1)
3 3 MASK Output to disable speech circuit during pulse dialling
and recall. (See Note 2)
6 6 FILT IN Unity gain amplifier input and output for DTMF tone
7 7 FILT OUT filtering
11 13 MF OUT DTMF output
1 1 IMP 'Loop disconnect' dialling output. During dialling, a
logic 1 (high level) correponds to loop connection while
a logic 0 (low level) corresponds to loop disconnection.
2 2 SELECT LD/DTMF selection, IDP and B:M ratio programming
13 15 C1 Column output connections for 16 button single contact
14 16 C2 keypad
15 17 C3
20 22 C4
16 18 R1 Row input connections for 16 button single contact
17 19 R2 keypad
18 20 R3
19 21 R4
8 8 HSW Hookswitch input. A logic 1 (High) applied to this input
indicates an "off-hook" condition.
- 11 LOCK Lock Input must be tied to V
SS
to disable all keypad keys
(except TBR and LNR). Normal operation is enabled by
connecting LOCK to V
DD.
- 12 N/C No connection
Note 1: The MUTE output is provided to disable the microphone (via the speech
network) while maintaining the loop condition during DTMF transmission.
Note 2:The MASK output may be used to disconnect the whole speech circuit in order
to maintain the break condition whilst on-hook, during a Timed Break Recall
(TBR) operation or LD dialling.
Table 1: Pin Description
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