Datasheet

MAX4670
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
_______________________________________________________________________________________ 7
PIN NAME FUNCTION
— N.C. No Connection. Not internally connected.
1 INB
Transmitter 1 Logic Control. Drive INB high to connect NC3 and NC4. INB logic is ignored
when SWITCH asserts low.
2 COM3
Common Terminal 3. Transmitter 1 positive differential terminal. Connect COM3 to the transmit
interface transformer.
3 COM4
Common Terminal 4. Transmitter 1 negative differential terminal. Connect COM4 to the
transmit interface transformer.
4 GND Ground
5INC
Transmitter 2 Logic Control. Drive INC high to connect NC5 and NC6. INC logic is ignored
when SWITCH asserts low.
6 COM5
Common Terminal 5. Transmitter 2 positive differential terminal. Connect COM5 to the transmit
interface transformer.
7 COM6
Common Terminal 6. Transmitter 2 negative differential terminal. Connect COM6 to the
transmit interface transformer.
8 SWITCH
Protection Switch Control. Assert SWITCH low to connect all switches to protection bus. When
SWITCH asserts low, SWITCH overrides all IN_ inputs. Assert SWITCH high to enable all
switches and let the respective IN control the switches.
9, 32 V+ Positive Supply Voltage. Bypass V+ to ground with a 0.1µF ceramic capacitor.
10 IND
Receiver 2 Logic Control. Drive IND high to connect NC7 and NC8. IND logic is ignored when
SWITCH asserts low.
11 COM7
Common Terminal 7. Receiver 2 positive differential terminal. Connect COM7 to the receive
interface transformer.
12 COM8
Common Terminal 8. Receiver 2 negative differential terminal. Connect COM8 to the receive
interface transformer.
13 NO8
Normally Open Terminal 8. Receiver 2 differential protection terminal. Connect NO8 to the
protection bus.
14 NC8 Normally Closed Terminal 8. Receiver 2 differential terminal. Connect NC8 to LIU receiver.
15 NO7
Normally Open Terminal 7. Receiver 2 differential protection terminal. Connect NO7 to the
protection bus.
16 NC7 Normally Closed Terminal 7. Receiver 2 differential terminal. Connect NC7 to LIU receiver.
17 NO6
Normally Open Terminal 6. Transmitter 2 differential protection terminal. Connect NO6 to the
protection bus.
18 NC6 Normally Closed Terminal 6. Transmitter 2 differential terminal. Connect NC6 to LIU receiver.
19 NO5
Normally Open Terminal 5. Transmitter 2 differential protection terminal. Connect NO5 to the
protection bus.
20 NC5 Normally Closed Terminal 5. Transmitter 2 differential terminal. Connect NC5 to LIU receiver.
21 NO4
Normally Open Terminal 4. Transmitter 1 differential protection terminal. Connect NO4 to the
protection bus.
Pin Description