Purchase SA541, In-stock SA541 From SeekIC.
Part Number: SA541
Description: The SAMES SA54X1 is a family of keypad switchable Loop Disconnect (LD)/Dual Tone multi-Frequency (DTMF...
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SA541
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DataSheet
General Description
SA541 General Description
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.
SA541 Maximum Ratings
| Parameter |
Min |
Max |
Unit |
Notes |
| Supply Voltage VDD - VSS |
-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 (except HSW, FILTOUT and FILTIN) Current at pin FILTOUT Current at pin FILTIN |
-1 0 -5 |
1 0,1 0 |
mA mA mA |
|
| Operating Temperature |
-25 |
70 |
°C |
|
| Storage Temperature |
-55 |
125 |
°C |
Note 1: A diode is internally connected between this pin and VDD. Provided current is externally limited to 300A max, no damage will occur.
SA541 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 contact 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 - 5A @ 2.5V
SA5416 - 1A @ 2.5V
SA5419 - 1A @ 3.0V
` Call, barring/locking feature available on the SA54L1
` 32 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
` 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 - 5A @ 2.5V
SA5416 - 1A @ 2.5V
SA5419 - 1A @ 3.0V
` Call, barring/locking feature available on the SA54L1
SA541 Typical Application
`The circuit in Figure 7 uses a constant current supply to draw current from the telephone line which is used to power the SA54X1. The 2,5V reference
diode produces a stabilised supply voltage which determines the DTMF tone level of the SA54X1.
`In Figure 8, a stabilising voltage from the speech circuit is used to supply the SA54X1 during DTMF dialling to give accurate tone levels.
`The SA54X1 is powered via the 150KW resistor during TBR operations and LD dialling breaks, and via T1 during dialling makes. This configuration
minimises the component count, at the expense of allowing a leakage current of about 450A during dialling breaks. The 47F reservoir
capacitor maintains and smoothes the supply to the chip.
SA541 Connection Diagram
SA541
PDF/DataSheet Download
- Datasheet: SA541
- File Size: 283641 KB
- Manufacturer: SAMES [Sames]
- Click here to Download
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