HC55143IM Intersil, HC55143IM Datasheet - Page 26

• Manufacturer Part Number: HC55143IM
• Description: IC SLIC UNIVERSAL LP 32-PLCC
• Manufacturer: Intersil
• Series: UniSLIC14r

Specifications of HC55143IM

• Function: Subscriber Line Interface Concept (SLIC)
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 2.25mA
• Power (watts): 1.4W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Includes: Battery Tracking Anti-Clipping, Loop and Ground Key Detection, Ring Control
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -

Given: V
across tip and ring) = 600Ω, Quiescent battery power =
(48V) (0.8mA) = 38.4mW, Quiescent VCC power = (5V)
(2.7mA) = 13.5mW, Power sharing resistor = 600Ω.
On-chip power dissipation without power sharing resistor.
On-chip power dissipation with 600Ω power sharing resistor.
Pinouts - 28 Lead PLCC Packages
PD
PD
PD
PD
1. Without power sharing, the on-chip power dissipation
2. With power sharing, the on-chip power dissipation is
FIGURE 25. POWER SHARING (SINGLE SUPPLY SYSTEMS)
RDC_RAC
would be 952mW (Equation 42).
412mW (Equation 43). A power redistribution of 540mW.
=
=
=
=
ON SHORT LOOPS, THE
MAJORITY OF CURRENT
FLOWS OUT THE V
BGND
(
(
–
952mW
412mW
RING
V
V
VBH
CRT
VBL
(
TIP
BH
BH
R
BH
L
) 30mA
) 30mA
) 30mA
10
11
= V
(
(
(
5
6
7
8
9
HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
BL
)
= -48V, Loop current = 30mA, R
)
)
12
2
4
+
+
–
BL
38.4mW
38.4mW
(
(28 LEAD PLCC)
13
RING
R
PIN
3
PS
TIP
TOP VIEW
HC55120
14
2
) 30mA
(
26
+
+
15
UniSLIC14
V
1
13.5mW
13.5mW
BL
-48V
28
16
)
2
R
PS
27
17
–
(
-48V
RL
26
18
V
) 30mA
(
BH
25
24
23
22
21
20
19
L
V
V
AGND
RSYNC
ILIM
ROH
RD
V
GKD
(EQ. 42)
(EQ. 43)
RX
)
(load
TX
2
CC
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 (V
the low battery supply (V
RDC_RAC
FIGURE 26. BATTERY SELECTION (DUAL SUPPLY SYSTEMS)
CRT_REV
40
35
30
25
20
15
10
BGND
5
0
RING
VBH
VBL
TIP
V
10
11
BL
5
6
7
8
9
V
BH
12
4
13
3
(28 LEAD PLCC)
LOOP RESISTANCE (Ω)
14
BL
2
TOP VIEW
HC55121
).
15
1
BH
28
16
) and for short loops from
17
27
VBH = -48V
VBL = -24V
RILim = 33.2kΩ
26
18
25
24
23
22
21
20
19
AGND
RSYNC_REV
ILIM
ROH
RD
V
GKD
CC
June 1, 2006
FN4659.13
V
V
BH
BL