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參數(shù)資料
| 型號： | HC5517B |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| 中文描述： | 低成本三任振鈴用戶接口的ISDN調(diào)制解調(diào)器/電訊和WL |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 88K |
| 代理商： | HC5517B |
65
The truth table for the internal logic of the HC5517B is provided
in the above table. This family of ringing SLICs can be config-
ured to support traditional unbalanced ringing and through
SLIC balanced ringing. The device operating states used by
through SLIC ringing applications are loop power denial and
normal feed. During loop power denial, the tip and ring amplifi-
ers are disabled (high impedance) and the DC voltage of each
amplifier approaches ground. The SLIC will not provide current
to the subscriber loop during this mode and will not detect loop
closure. Voice transmission occurs during the normal loop feed
mode. During normal loop feed the SLIC is completely opera-
tional and performs all transmission and supervisory functions.
Power Dissipation
Careful thermal design is required to guarantee that the
maximum junction temperature of 150
o
C of the device is not
exceeded. The junction temperature of the SLIC can be
calculated using:
Where T
A
is maximum ambient temperature and
θ
JA
is
junction to air thermal resistance (and is package depen-
dent). The entire term in parentheses yields the SLIC power
dissipation. The power dissipation of the subscriber loop
does not contribute to device junction temperature and is
subtracted from the power dissipation term. Operating at
85
o
C, the maximum PLCC SLIC power dissipation is 1.18W.
Likewise, the maximum SOIC SLIC power dissipation is
0.92W.
R
R
R
V
RX
OUT 1
R/20
R/2
TIP
TA
R
2R
2R
R
90K
RING
SENSE 1
RA
4.5K
25K
25K
100K
100K
4.5K
90K
RF
25
17
12
+2V
TF
14
RF
15
16
26
3
OP AMP
V
RING
V
TX
GM
28
11
RF2
BIAS
NETWORK
AGND
V
CC
I
TSD
GK
RFC
SH
F0
F1
RS
ALM
RTD
SHD
TST
V
BAT
-IN 1
13
24
19
2
1
TF
BGND
22
27
4
5
6
9
20
21
7
8
10
R = 108k
R
R
100K
100K
90K
18
SENSE
RING
SENSE 2
RDO
+
-
+
-
THERM
LTD
SHD
RTD
FAULT
DET
+
-
+
-
+
-
+
-
REF
VB/2
V
REF
NU
I
LIMIT
RDI
RTI
HC5517B DEVICE TRUTH TABLE
F1
F0
STATE
0
0
Loop power Denial Active
0
1
Power Down Latch RESET, Power on
RESET
1
0
RD Active (unbalanced ringing)
1
1
Normal Loop feed
T
J
T
A
θ
JA
I
CC
V
CC
I
BAT
V
BAT
I
LOOP
(
)
2
R
LOOP
(
)
–
+
(
)
+
=
(EQ. 1)
HC5517B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC5517BCB | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| HC5517BCM | Low Cost 3 REN Ringing SLIC for ISDN Modem/TA and WL |
| HC5517 | 3 REN Ringing SLIC For ISDN Modem/TA and WLL |
| HC5517CB | 3 REN Ringing SLIC For ISDN Modem/TA and WLL |
| HC5517CM | 3 REN Ringing SLIC For ISDN Modem/TA and WLL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC5517B WAF | 制造商:Harris Corporation 功能描述: |
| HC5517BCB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
| HC5517BCB96S2495 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5517BCM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HC5517CB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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