Specifications

Si2493
50 Rev. 1.3
9. Pin Descriptions: Si3018
Table 14. Si3018 Pin Descriptions
Pin # Pin Name Description
1QETransistor Emitter.
Connects to the emitter of Q3.
2DCTDC Termination.
Provides dc termination to the telephone network.
3
RX
Receive Input.
Serves as the receive side input from the telephone network.
4IB
Internal Bias.
Provides a bias voltage to the device.
5C1BIsolation Capacitor 1B.
Connects to one side of isolation capacitor C1 and communicates with the system side.
6C2BIsolation Capacitor 2B.
Connects to one side of isolation capacitor C2 and communicates with the system side.
7VREGVoltage Regulator.
Connects to an external capacitor to provide bypassing for an internal power supply.
8RNG1Ring 1.
Connects through a resistor to the RING lead of the telephone line. Provides the ring and
caller ID signals to the Si2493.
9RNG2Ring 2.
Connects through a resistor to the TIP lead of the telephone line. Provides the ring and
caller ID signals to the Si2493.
10 VREG2 Voltage Regulator 2.
Connects to an external capacitor to provide bypassing for an internal power supply.
11 SC SC Connection.
Enables external transistor network. Should be tied through a 0  resistor to I
GND
.
12 QE2 Transistor Emitter 2.
Connects to the emitter of Q4.
13 QB
Transistor Base.
Connects to the base of transistor Q4.
14 DCT3 DC Termination 3.
Provides the dc termination to the telephone network.
15 IGND Isolated Ground.
Connects to ground on the line-side interface.
16 DCT2 DC Termination 2.
Provides dc termination to the telephone network.
QE
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DCT
RX
IB
C1B
C2B
VREG
RNG1
RNG2
VREG2
SC
QE2
QB
DCT3
IGND
DCT2
1
Si3018