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CYG2911
DS-CYG2911-R1
The CYG2911 is a Data Access Arrangement (DAA) mod-
ule providing a complete telephone line interface circuit in
a small 1.07" x 1.07" x 0.4" plastic package. This module
incorporates a circuit which signals HIGH when another
phone in parallel has been taken off-hook when the
CYG2911 is off-hook. This feature is important for cable
TV set-top boxes and direct broadcast satellite units
which must hang-up (go on-hook) when a consumer
needs the phone line to place a 911 or emergency call.
The module is designed to meet FCC Part 68 require-
ments thus providing a low-risk design solution.
•Home medical devices
•Plant monitoring equipment
•Security/alarm systems
•Utility meters
•Network routers
•PBX systems
•Telephony applications
•Set top boxes
•UL 1950/UL1459
•Compatible with U.S. and Canadian phone lines
•Transformer signal coupling
•Complete ring detector circuit
•Low power hookswitch
•Electronic inductor/gyrator circuit
•Surge protection
•Caller ID pinout to external relay (optional)
•Transient protection zeners
•V.32 compatible
•FCC Compatible
•PC board mountable
•Parallel telephone off-hook detection
Applications
Features Description
Approvals
Cybergate™
Ordering Information
Part # Description
CYG2911 DAA Module
Block Diagram
8
7
9
RING
OH
911
1
217
18
11
10
14
13
HOOKSWITCH
LINE 2
LINE 1 RING
GND
VCC
VCC
TIP
RING
GYRATOR/
CALLER ID
VCC
RING
R_LIM
R_LIM
VCC
200k
47k
911
RING
DETEC-
TION
SURGE
PROTEC-
TION
CID1
CID2
CYG2911
470Ω
Handling and Assembly Recommendations
The CYG2911 products are not hermetically sealed and should not be exposed to any liquid-based rinsing processes. Clare recommends two (2) approaches. The modem
should either use a no clean soldering flux that would mostly evaporate during the normal wave soldering processes, or be soldered in by hand after the rest of the card
is wave soldered.
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CYG2911
R1
Electrical Characteristics
Absolute Maximum Ratings are stress ratings. Stresses
in excess of these ratings can cause permanent damage
to the device. Functional operation of the device at these
or any other conditions beyond those indicated in the
operational sections of this data sheet is not implied.
Exposure of the device to the absolute maximum ratings
for an extended period may degrade the device and effect
its reliability.
Absolute Maximum Ratings (@ 25˚ C)
2
Parameter Conditions Min Typ Max Unit
DC Electrical Characteristics
On-Hook Impedance @100VDC across pins 10 - - MΩ
10,11 (R,T), per FCC 68.312
Off-Hook Line Leakage Current @100VDC across pins - - 10 µA
10,11 (R,T), per FCC 68.312
Hookswitch Resistance - - - 15 Ω
Off-Hook Supply Current @+5V, VCC 789mA
Hookswitch Power Source, Pin 8 - 4.75 5.0 20 V
DC Loop Current - 20 - 120 mA
AC Signal Path Electrical Characteristics
Return Loss 300-3500Hz 18 25 - dB
Insertion Loss
Transmit Test Circuit 1 - - 9 dB
Receive Test Circuit 2 - - 9 dB
Frequency Response 300-3500Hz -0.25 - +0.25 dB
Longitudinal Balance
On-Hook Per FCC 68.310 60 - - dB
Off-Hook Per FCC 68.310 40 - - dB
DC Loop Current - 20 - 120 mA
Total Harmonic Distortion + N @600Hz and -10dBm - -45 - dBm
Secondary Load Impedance Line 1 and Line 2 - 294 - Ω
Primary Source Impedance Tip and Ring - 600 - Ω
Ring Detection Circuit Characteristics
Ringing Voltage Detection Range - 20 - 150 VRMS
Ringing Frequency Detection Range - 15 - 70 Hz
Ringer Equivalence Number - - 0.8B -
RING (Pin 9) Output Voltage (Pulsed) VCC @+5V
Logic ‘0’, Ring present - - 0.8 V
Logic ‘1’, Ring not present - - VCC V
Surge, Transient, and Isolation Characteristics
Surge Protection Voltage Tip and Ring
(Pins 11,10) - - - 300
Transient Voltage Protection on
Line 1 and Line 2 (Pins 1,2) - -5 - +5 V
Isolation Voltage
(Pins 1,2,7,8,9,17,18 to 10,11,13,14) Per FCC 68.302 - - 1000 VRMS
Parameter Min Typ Max Units
Isolation Voltage - 1000 VRMS
Operational Temperature 0 +70 °C
Storage Temperature 0 - +100 °C
Relative Humidity 10 - 85 %
(Non-Condensing)
Soldering Temperature - - +260 °C
Tip/Ring (5, 6) Load Current
(continuous) - - 120 mA
Hookswitch LED Drive Current - - 50 mA
Hookswitch LED Reverse Voltage- - 5 V
Ring Detect Phototransistor
Voltage VCC --20V
CYG2911
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R1 3
Electrical Characteristics (Continued)
Parameter Conditions Min Typ Max Unit
911 Detection Characteristics (Pin 7)
Pulse Voltage
External phone off-hook - 2.4 - VCC V
External phone on-hook - - - 0.8 V
Pulse Width Telephone DCR 200Ω20 40 60 mS
Internal pull-up resistor - - 200K - Ω
Top View
18
17
1
2
8
7
911
10
VCC
GND
TIP
RING
14
13
CID1
CID2
LINE 1
LINE 2
911
OH
RING
CYG2911
1
213
14
VCC
µP Control
(Active Low)
CID1
CID2
CYG2911
Caller ID Connections
Pins 13 & 14 should be connected to a 1-Form-A
relay (Clare LCA110), as follows:
CYG2911 Pinouts & Definitions
PIN# I/O Name Function
1 I/O LINE1 Transformer isolated audio signal coupling path for the
telephone line.
2 I/O LINE2 Transformer isolated audio signal coupling path for the
telephone line.
7 O 911 Signals HIGH for 20-60ms when the CYG2911 is off-hook
and another phone goes off-hook. Glitches may appear on
this pin when the CYG2911 first goes off-hook, and should
be ignored for a minimum of 200ms.
8 I OH Driving this pin LOW asserts the off-hook condition. The
hookswitch LED is current limited by an internal 470Ω
resistor.
9 O RING Active LOW indicates an incoming ring signal. This is
pulsed LOW by the AC ring signal at the ring frequency
from 15-40Hz.
10 I/O RING Connection to telephone line Ring conductor.
11 I/O TIP Connection to telephone line Tip conductor.
13 O CID2 Caller ID connection. CID1/CID2 connect to an external 1-
Form-A solid state relay (Clare LCA110). When the SSR is
closed (connecting CID1 to CID2), Caller ID information is
presented to LINE1/LINE2 after the first telephone ring
burst.
14 O CID1 Caller ID connection. See CID2 above.
17 I GND Connected to host system ground.
18 I VCC Provides power to the hookswitch LED. Typically +5V for ≈
8mA LED current. LED is current limited by an internal
470Ωresistor. VCC should not exceed 20V.
Package Pinout
Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions
at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in Clare’s Standard Terms and Conditions of Sale, Clare, Inc. assumes no liability whatsoever, and
disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to sup-
port or sustain life, or where malfunction of Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to discontinue or
make changes to its products at any time without notice.
Specification: DS-CYG2911-R1.0
©Copyright 2002, Clare, Inc.
All rights reserved. Printed in USA.
6/25/02
For additional information please visit our website at: www.clare.com
