MH88634B

Features:

• Loop Start Trunk Interface
• 600 & 900 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


Application

Interface to Central Office for:
• PABX
• Key Telephone Systems
• Channel Bank
• Voice Mail
• Terminal Equipment
• Digital Loop Carrier
• Optical Multiplexer


Pinout




Specifications

	Parameter	Sym	Min	Max	Units	Comments
1	DC Supply Voltages)	VCC	-0.3	7	V
		VEE	0.3	-7	V
2	DC Ring Relay Voltage	VRLY	-0.3	18	V
3	Storage Temperature	TS	-55	+125	°C
4	Ring Trip Current	ITRIP		180	mArms	250ms 10% duty cycle or 500ms single shot

Description

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 MH88634-2 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 MH88634-2 is fabricated as a thick film hybrid incorporating various technologies for optimum circuit design and very high reliability.

MH88634-2 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.