MH88634B Datasheet, PDF (1/13 Pages) Mitel Networks Corporation – Central Office Interface Circuit Advance Information

Features
• Loop Start Trunk Interface
• 600Ω & 900Ω Input Impedance
• 2-4 Wire Conversion
• Line state Detection Outputs:
•
- Forward Loop
• - Reverse Loop
• - Ringing Voltage
• - Switch Hook
• One Relay Driver
• On-Hook Reception
• Small footprint area
• Meets FCC Part 68 Leakage Current
Requirements
Applications
Interface to Central Office for:
• PABX
• Key Telephone Systems
• Channel Bank
• Voice Mail
• Terminal Equipment
• Digital Loop Carrier
• Optical Multiplexer
RV FL RL SHK XLA XLB XLC XLD
MH88634B
Central Office Interface Circuit
Advance Information
DS5061
ISSUE 6
January 1999
Ordering Information
MH88634BV-2
MH88634BT-2
MH88634BV-4
21 Pin SIL Package
21 Pin 90° L/F Package
21 Pin SIL Package
Description
0°C to 70°C
The Mitel MH88634-2 Central Office Interface Circuit
trunk provides a complete analogue and signalling
link between audio switching equipment and a
telephone Line. The device is available in a single in
line package for high packing densities or with a lead
frame formed at 90° for low clearance applications.
The device is fabricated as a thick film hybrid
incorporating various technologies for optimum
circuit design and very high reliability.
This part supercedes the MH88634-2 and is pin for pin
compatible.
We advise that the B rev parts are fully tested.
However, we do not expect to see changes between
MH88634-2 and MH88634BV-2.
The component design has been changed to
improve the general performance of the part. It is
also now capable of operating at a 24V battery.
VCC VEE AGND
Status
Detection
TIP
RING
LRC
LRD
Dummy
Ringer
Line
Termination
2 - 4 Wire
Hybrid
Loop Relay
Driver
VRLY
Impedance
Matching
Network
Balance
Figure 1 - Functional Block Diagram
Receive
Gain
RX
Transmit
Gain
TX
2-265