MSA4709A View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
Manufacturer
MSA4709A Datasheet PDF : 11 Pages
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¡ Semiconductor
MSA4709A
Pin No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Name
SEL
CDP
IL
VBS
BF
RI
VCC
ZX
CB
G
PB
PE
B
NC
Description
SCN output information select control input. At SEL = "L", SCN Indicates only ground/
battery fault condition.
Dial pulse shaping capacitor input.
Tip to Ring constant loop current determination resistor input.
Supply voltage selection terminal.
VBS = VCC (–24 V), VBS = G (–48 V).
Battery-feed mode control input. A logic level "H" switches off both the Ring and Tip
current drive amp. and presents a high impedance to the line. (apr. 80 kW).
Relay driver control input. RI = "H" is Driver "ON"
+5 V input
2 wire terminating impedance compornent Zx input. This pin has a low input
impedance.
Compensation capacitor input.
This capacitor value is 4700 pF(35V).
Ground input.
The base drive output for the PNP Darlington power transistor.
The Tip current sensing input is connected to the emitter of the PNP Darlington power
transister and the power resistor REB.
The Tip voltage sensing input. This input is high impedance (apr. 37 kW) and is
connected to the built-in over voltage protection circuit.
No connection
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