HC5526 Intersil Corporation, HC5526 Datasheet

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HC5526

Manufacturer Part Number
HC5526
Description
ITU CO/PABX SLIC with Low Power Standby
Manufacturer
Intersil Corporation
Datasheet

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ITU CO/PABX SLIC with Low Power
Standby
The HC5526 is a subscriber line interface circuit that is
compliant with CCITT standards. Enhancements include
immunity to circuit latch-up during hot plug and absence of
false signaling in the presence of longitudinal currents.
The HC5526 is fabricated in a High Voltage Dielectrically
Isolated (DI) Bipolar Process that eliminates leakage
currents and device latch-up problems normally associated
with Junction Isolated (JI) ICs. The elimination of the
leakage currents results in improved circuit performance for
wide temperature extremes. The latch free benefit of the DI
process guarantees operation under adverse transient
conditions. This process feature makes the HC5526 ideally
suited for use in harsh outdoor environments.
Ordering Information
Block Diagram
HC5526CM
HC5526CP
HC5526IM
HC5526IP
PART NUMBER
RANGE (
RINGRLY
-40 to 85
-40 to 85
TEMP.
0 to 70
0 to 70
AGND
BGND
RING
V
HPR
HPT
V
V
TIP
BAT
DR
DT
CC
EE
o
57
C)
BIAS
28 Ld PLCC
22 Ld PDIP
28 Ld PLCC
22 Ld PDIP
INTERFACE
RING RELAY
DETECTOR
Data Sheet
RING TRIP
PACKAGE
2-WIRE
DRIVER
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
N28.45
E22.4
N28.45
E22.4
PKG.
NO.
LOOP CURRENT
GROUND KEY
DETECTOR
DETECTOR
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
Features
• DI Monolithic High Voltage Process
• Programmable Current Feed (20mA to 60mA)
• Programmable Loop Current Detector Threshold and
• Ground Key and Ring Trip Detection
• Compatible with Ericsson’s PBL3764
• Thermal Shutdown
• On-Hook Transmission
• Wide Battery Voltage Range (-24V to -58V)
• Low Standby Power
• Meets CCITT Transmission Requirements
• -40
Applications
• On-Premises (ONS)
• Key Systems
• PBX
• Related Literature
Battery Feed Characteristics
- AN9537, Operation of the HC5513/26 Evaluation Board
o
INTERFACE
VF SIGNAL
C to 85
MULTIPLEXER
4-WIRE
PATH
October 1998
DIGITAL
o
C Ambient Temperature Range
V
RSN
E0
E1
C1
C2
DET
R
RSG
R
TX
DC
D
File Number 4151.6
HC5526

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HC5526 Summary of contents

Page 1

... Data Sheet ITU CO/PABX SLIC with Low Power Standby The HC5526 is a subscriber line interface circuit that is compliant with CCITT standards. Enhancements include immunity to circuit latch-up during hot plug and absence of false signaling in the presence of longitudinal currents. The HC5526 is fabricated in a High Voltage Dielectrically ...

Page 2

... V TRO I DCMET 23mA RING RSN 28 16 FIGURE 1. OVERLOAD LEVEL (TWO-WIRE PORT) 58 HC5526 Thermal Information 110 C Thermal Resistance (Typical, Note 1) 22 Lead PDIP Package . . . . . . . . . . . . . . . . . . . . . . 28 Lead PLCC Package Continuous Dissipation Lead PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5W 28 Lead PLCC Package .1.5W Package Power Dissipation Lead PDIP Package ...

Page 3

... Longitudinal to 4-Wire Metallic to Longitudinal 4-Wire to Longitudinal R LT TIP 2.16 F RING FIGURE 4. LONGITUDINAL TO METALLIC AND LONGITUDINAL TO 4-WIRE BALANCE 2-Wire Return Loss C = 20nF HP 59 HC5526 5 -5V 5 10nF CONDITIONS No False Detections (Loop Current), LB > 45dB (Note 4, Figure 3A) No False Detections (Loop Current) (Note 5, Figure 3B) RSN 16 2 ...

Page 4

... RECEIVE PORT (RSN) DC Voltage R Sum Node Impedance (Guaranteed by X Design) Current Gain-RSN to Metallic FREQUENCY RESPONSE (OFF-HOOK) 2-Wire to 4-Wire 4-Wire to 2-Wire 4-Wire to 4-Wire INSERTION LOSS 2-Wire to 4-Wire 4-Wire to 2-Wire GAIN TRACKING (Ref = -10dBm, at 1.0kHz) 2-Wire to 4-Wire 2-Wire to 4-Wire 4-Wire to 2-Wire 60 HC5526 5 -5V 5 10nF CONDITIONS Z > ...

Page 5

... Constant Loop Current Tolerance R = 41.2k DCX Loop Current Tolerance (Standby) Open Circuit Voltage ( TIP RING LOOP CURRENT DETECTOR On-Hook to Off-Hook Off-Hook to On-Hook Loop Current Hysteresis GROUND KEY DETECTOR Tip/Ring Current Difference - Trigger Tip/Ring Current Difference - Reset 61 HC5526 5 -5V 5 10nF CONDITIONS -55dBm to -40dBm (Note 22, Figure 9) ...

Page 6

... Input Low Current C1 Input Low Current E0 Input High Current DETECTOR OUTPUT (DET) Output Low Voltage Output High Voltage Internal Pull-Up Resistor POWER DISSIPATION Open Circuit State On-Hook, Standby On-Hook, Active Off-Hook, Active TEMPERATURE GUARD Thermal Shutdown 62 HC5526 5 -5V 5 10nF CONDITIONS (Note 29, Figure 11 ...

Page 7

... R L 600 Circuit Operation and Design Information The HC5526 is a current feed voltage sense Subscriber Line Interface Circuit (SLIC). This means that for short loop applications the SLIC provides a programmed constant current to the tip and ring terminals while sensing the tip to ring voltage. The following discussion separates the SLIC’ ...

Page 8

... I = 23mA, R BAT L 0 SATURATION GUARD VOLTAGE -10 CONSTANT CURRENT RESISTIVE FEED FEED REGION -20 -30 -40 SATURATION GUARD VOLTAGE -50 0 1.2K LOOP RESISTANCE ( ) FIGURE 14 HC5526 + - LOOP CURRENT CIRCUIT I TIP I RING - SATURATION GUARD + CIRCUIT -5V -5V FIGURE 13. DC LOOP CURRENT Figure 15 shows the relationship between the saturation guard voltage, the loop current and the loop resistance. Notice from Figure 15 that for a loop resistance < ...

Page 9

... SLIC is configured in the active mode for voice transmission. The loop current in standby state is calculated as follows: V – 3V BAT I ------------------------------- - L R 1800 + L 65 HC5526 resistor value and where Loop current in the standby state, L (EQ Loop resistance, and Battery voltage. BAT (AC) Transmission Path SLIC in the Active Mode Figure 16 shows a simplifi ...

Page 10

... HC5526 A = 250 + - 250 HC5526 (AC) 4-Wire to 4-Wire Gain The 4-wire to 4-wire gain is equal to V (EQ. 16) From Equations 9, 10 and 11 with – Transhybrid Circuit The purpose of the transhybrid circuit is to remove the receive signal (V an echo on the transmit side. This is accomplished by using an ...

Page 11

... RD 600 300 The I current results in a voltage drop across R RD compared to an internal 1.25V reference voltage. When the 67 HC5526 voltage drop across configured for loop current detection, the DET pin goes low. The hysteresis resistor effectively across R threshold to be slightly higher than the off-hook to on-hook ...

Page 12

... HC5526 Digital Logic Inputs Table 1 is the logic truth table for the TTL compatible logic input pins. The HC5526 has two enable inputs pins (E0, E1) and two control inputs pins (C1, C2). The enable pin E0 is used to enable or disable the DET output pin. The DET pin is enabled logic level 0 and disabled logic level 1 ...

Page 13

... Surge Voltage Protection The HC5526 must be protected against surge voltages and power crosses. Refer to “Maximum Ratings” TIPX and RINGX terminals for maximum allowable transient tip and ring voltages ...

Page 14

... Power-Up Sequence The HC5526 has no required power-up sequence. This is a result of the Dielectrically Isolated (DI) process used in the fabrication of the part. By using the DI process, care is no longer required to insure that the substrate be kept at the most negative potential as with junction isolated ICs. Printed Circuit Board Layout Care in the printed circuit board layout is essential for proper operation ...

Page 15

... fuse resistors impact the insertion loss. The specified F insertion loss is for HC5526 20. Four-Wire to Two-Wire Insertion Loss. The 4-wire to 2-wire insertion loss is measured based upon E input signal, E the following equation: L 4-2 (Reference Figure 6). where 21. Two-Wire to Four-Wire Gain Tracking. The 2-wire to 4-wire ...

Page 16

... SENSE 27 5 TIPX Output of tip power amplifier RINGX Output of ring power amplifier. 3, 10, N/C No internal connection. 17 HC5526 DESCRIPTION . C is required to properly separate the ring AC current from the connected to HPT required to properly separate the tip AC current from the connected to HPR. HP sets the trigger level for the loop current detect circuit. A fi ...

Page 17

... Pinouts HC5526 (PLCC) TOP VIEW RINGRLY BAT N DET HC5526 N HPT 20 HPR HC5526 (PDIP) TOP VIEW HPT 1 22 HPR RSN TIPX 5 18 AGND RINGX BGND RINGRLY DET BAT ...

Page 18

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site http://www.intersil.com 74 HC5526 C (NOTE 32) HP ...

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