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HC55151 Datasheet(PDF) 25 Page - Intersil Corporation

Part # HC55151
Description  Low Power Universal SLIC Family
PDF  35 Pages
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HC55151 Datasheet(HTML) 25 Page - Intersil Corporation

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Battery Selection
Battery selection is a technique, for a two battery supply
system, where the SLIC automatically diverts the loop
current to the most appropriate supply for a given loop
length. This results in significant power savings and lowers
the total power consumption on short loops. This technique
is particularly useful if most of the lines are short, and the on
hook condition requires a -48V battery. In Figure 26, it can
be seen that for long loops the majority of the current comes
from the high battery supply (VBH) and for short loops from
the low battery supply (VBL).
FIGURE 26. BATTERY SELECTION (DUAL SUPPLY SYSTEMS)
0
35
30
25
20
15
10
5
LOOP RESISTANCE (
Ω)
40
VBH = -48V
VBL = -24V
RILim = 33.2k
Ω
VBL
VBH
VBH
VBL
Pinouts - 28 Lead PLCC Packages
HC55120
(28 LEAD PLCC)
TOP VIEW
HC55121
(28 LEAD PLCC)
TOP VIEW
HC55130
(28 LEAD PLCC)
TOP VIEW
HC55140
(28 LEAD PLCC)
TOP VIEW
RSYNC
ILIM
ROH
RD
AGND
GKD
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT
RDC_RAC
RSYNC_REV
ILIM
ROH
RD
AGND
GKD
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT_REV
RDC_RAC
RSYNC
ILIM
ROH
RD
AGND
NC
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT
RDC_RAC
RSYNC_REV
ILIM
ROH
RD
AGND
GKD_LVM
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT_REV_
RDC_RAC
LVM
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151



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