Data Sheet
October 2002
L8583D Line Card Access Switch
Pin Information
(continued)
Table 1. Pin Descriptions
20-Pin SOG 28-Pin SOG Symbol*
Description
1
1
F
GND
Fault ground.
2
5
T
TESTin
Test (in) access on TIP.
3
6
T
BAT
Connect to TIP on SLIC side.
4
7
T
LINE
Connect to TIP on line side.
5
8
T
RINGING
Connect to return ground for ringing generator.
6
10
T
TESTout
Test (out) access on TIP.
7
2, 3, 4, 9, 11, 21,
NC
No connection.
25, 26, 27
5 V supply.
8
12
V
DD
9
13
T
SD
Temperature shutdown pin. Can be used as a logic level input or an output. See
description. As an output flag, this pin will read 5 V when the device is in its
operational mode and 0 V in the thermal shutdown mode. To disable the thermal
shutdown mechanism, tie this pin to 5 V (not recommended).
10
14
D
GND
Digital ground.
11
15
IN
TESTout
u
Logic level switch input control.
12
16
IN
RING
u
Logic level switch input control.
13
17
IN
TESTin
d
Logic level switch input control.
14
18
LATCH
d
Data input control, active-high, transparent low.
15
19
R
TESTout
Test (out) access on RING.
16
20
R
RINGING
Connect to ringing generator.
17
22
R
LINE
Connect to RING on line side.
18
23
R
BAT
Connect to RING on SLIC side.
19
24
R
TESTin
Test (in) access on RING.
20
28
V
BAT
Battery voltage. Used as a reference for protection circuit.
* u = 75K typical pull-up resistor.
d = 75K typical pull-down resistor.
3
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