HC55120_06 Datasheet, PDF (29/36 Pages) Intersil Corporation – Low Power Universal SLIC Family

HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
Pinouts - 28 Lead SOIC Packages (Continued)
HC55130
(28 LEAD SOIC)
TOP VIEW
HC55140
(28 LEAD SOIC)
TOP VIEW
ZT 1
PTG 2
RRLY 3
CH 4
RING 5
BGND 6
TIP 7
VBH 8
VBL 9
RDC_RAC 10
CDC 11
DT 12
DR 13
CRT 14
28 AGND
27 VTX
26 NC
25 VRX
24 RSYNC
23 ILIM
22 ROH
21 RD
20 V_CC
19 SHD
18 C1
17 C2
16 C3
15 NC
HC55142
(28 LEAD SOIC)
TOP VIEW
ZT 1
PTG 2
RRLY 3
CH 4
RING 5
BGND 6
TIP 7
VBH 8
VBL 9
RDC_RAC 10
CDC 11
DT 12
DR 13
CRT_REV_LVM 14
28 AGND
27 VTX
26 SPM
25 VRX
24 RSYNC_REV
23 ILIM
22 ROH
21 RD
20 V_CC
19 SHD
18 C1
17 C2
16 C3
15 GKD_LVM
ZT 1
PTG 2
RRLY 3
CH 4
RING 5
BGND 6
TIP 7
VBH 8
VBL 9
RDC_RAC 10
CDC 11
DT 12
DR 13
CRT_REV_LVM 14
28 AGND
27 VTX
26 NC
25 VRX
24 RSYNC_REV
23 ILIM
22 ROH
21 RD
20 V_CC
19 SHD
18 C1
17 C2
16 C3
15 GKD_LVM
HC55150
(28 LEAD SOIC)
TOP VIEW
ZT 1
PTG 2
RRLY 3
CH 4
RING 5
BGND 6
TIP 7
VBH 8
VBL 9
RDC_RAC 10
CDC 11
DT 12
DR 13
CRT_REV_LVM 14
28 AGND
27 VTX
26 SPM
25 VRX
24 RSYNC_REV
23 ILIM
22 ROH
21 RD
20 V_CC
19 SHD
18 C1
17 C2
16 C3
15 LVM
Pin Descriptions
28
PIN
PLCC
1
32
PIN
PLCC
1
28
PIN
SOIC
2
SYMBOL
PTG
2
2
3
3
3
4
4
4
1
5
5
5
6
6
6
7
7
7
RRLY
CH
ZT
RING
BGND
TIP
DESCRIPTION
Programmable Transmit Gain - The 2-wire to 4-wire transmission gain is 0dB if this pin is left floating
and -6.02dB if tied to ground. The -6.02dB gain option is useful in systems where Pulse Metering is
used. See Figure 23.
Ring Relay Driver Output - The relay coil may be connected to a maximum of 14V.
AC/DC Separation Capacitor - CH is required to properly process the AC current from the DC loop
current. Recommended value 0.1µF.
2-Wire Impedance Matching Pin - Impedance matching of the 2-wire side is accomplished by placing
an impedance between the ZT pin and ground. See Equation 32.
Connects via protection resistor R_P to ring wire of subscriber pair.
Battery ground.
Connects via protection resistor R_P to tip wire of subscriber pair.
29
FN4659.13
June 1, 2006