HC55171B Datasheet, PDF (1/11 Pages) Intersil Corporation – Low Cost 5 REN Ringing SLIC for ISDN Modem/TA and WL

Data Sheet
HC55171B
July 1998 File Number 4422.1
Low Cost 5 REN Ringing SLIC
for ISDN Modem/TA and WL
The HC55171B low cost, 5 REN ringing SLIC is designed to
accommodate a wide variety of short loop applications and
provides the same degree of flexibility as the high
performance HC55171. The flexible features include open
circuit tip to ring DC voltages, user defined ringing
waveforms, ring trip detection thresholds, and loop current
limits that can be tailored for many applications. Additional
features of the HC55171B are complex impedance
matching, pulse metering, and transhybrid balance. The
HC55171B is designed for use in short loop, low cost
systems where traditional ring generation is not
economically feasible.
The device is manufactured in a high voltage Dielectric
Isolation (DI) process. The DI process provides substrate
latch up immunity, resulting in a robust system design. A
thermal shutdown with an alarm output and line fault
protection are also included for operation in harsh
environments.
Ordering Information
PART
NUMBER
HC55171BIM
HC55171BIB
TEMP. RANGE
(^oC)
PACKAGE
-40 to 85 28 Ld PLCC
-40 to 85 28 Ld SOIC
PKG. NO.
N28.45
M28.3
Block Diagram
Features
• Load Drive Capability . . . . . . . . . . . . . . . . . . . . . . . 5 REN
• Trapezoidal, Square or Sine Wave Capability
• Ringing from -80V Battery . . . . . . . . . . . . . . . . . . . 75V_P-P
• Ringing from -75V Battery . . . . . . . . . . . . . . . . . . . 70V_P-P
• Ringing Current Independent of Loop Current Setting
• Ringing Crest Factor Independent of REN Loading
• Latchup Immune to Inductive Kick Back and Hot Plug
• Fax, Answering Machine and MTU Compatible
• Resistive and Complex Impedance Matching
• Programmable Loop Current Limit
• Switch Hook, Ring Trip and Ground Key Detection
• Single Low Voltage +5V Supply
Applications
• Solid State Line Interface Circuit for Hybrid Fiber Coax, Set
Top Box, Voice/Data Modems
• Related Literature
- AN9607, Impedance Matching Design Equations
- AN9628, AC Voltage Gain
- AN9636, Implementing an Analog Port for ISDN
- AN549, The HC-5502/4X Telephone SLIC
TIP FEED
TIP SENSE
RING FEED
RING SENSE 1
RING SENSE 2
V_REF
RTI
V_BAT
V_CC
AGND
BGND
2-WIRE
INTERFACE
LOOP CURRENT
DETECTOR
FAULT
DETECTOR
BIAS
CURRENT
LIMIT
RING TRIP
DETECTOR
IIL LOGIC INTERFACE
F1 F0 RS TST
4-WIRE
INTERFACE
+^-
RELAY
DRIVER
RDI
V_RX
V_TX
V_RING
- IN 1
OUT 1
SHD
ALM
I_LIMIT
RTD
RDO
63
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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