SAMES SA54L16, SA54L19, SA5413, SA5414, SA5416 Datasheet

sames

SA541, SA54L1

FEATURES

■ Selectable Loop-Disconnect (Pulse)

or DTMF (Tone) dialling modes

■ 32 Digit Last Number Redial (LNR)

■ Selectable Interdigit Pause (IDP)

500ms or 800ms

■ Operates with inexpensive single con-

tact keypad

■ On-chip Darlington transistor pair for

DTMF tone filtering

■ Low power CMOS technology enables

direct operation from Telephone line

■ Optional use of external capacitor for

oscillator

PULSE/DTMF SWITCHABLE DIALLERS

■ 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

SA5413 - 5µA @ 2.5V
SA5416 - 1µA @ 2.5V
SA5419 - 1µA @ 3.0V

■ Call, barring/locking feature available

on the SA54L1

PIN CONNECTIONS:
SA541

PIN CONNECTIONS:
SA54L1

M57-1529 PDS039-SA541-001 REV. B 02-09-94

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SA541

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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

SA541

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Condition Min Ty p 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

SA5413 <0.2 5 µA V

DD

= 2.5V

SA5416 <0.2 1 µA V

DD

= 2.5V

Sa5419 <0.2 1 µ A V

DD

= 3.0V
off-hook 1,5 µA If MF OUT is low
MF tone sending 1,0 m A
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 kΩ
'Key Pressed' Resistance 2 k Ω 2,5V<V

DD

<5,7V

'Key Not Pressed' Resistance 500 kΩ 2,5V<V

DD

<5,7V

Darlington Pair Current Gain 600 50,000 I

e

=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 %

SA541

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FUNCTIONAL OVERVIEW

The SAMES SA54X1 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 32 digits
for Last Number Redial (LNR) purposes. The low current consumption of the SA54X1
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 is intended 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 SA54X1 is pin compatible with SAMES' SA54X5 family of diallers.

Ordering Information S A 5 4 X 1 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

4 1µA @ 3V (and TBR Period = 300 mSec)

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 a deviation in the oscillator frequency from 560
kHz.

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Block Diagram

Figure 1 depicts the SA54X1 block diagram, while Table 1 lists the respective pin
functions.

Figure 1: SA54X1 Block Diagram