MH89790B

Features:

• Complete primary rate 2048 kbit/s CEPT transceiver with CRC-4 option
• Selectable HDB3 or AMI line code
• Two frame elastic buffer with 32ms jitter buffer
• Tx and Rx frame and multiframe synchroniza-tion signals
• Frame alignment and CRC error counters
• Insertion and detection of A, B, C, D signalling bits with optional debounce
• Line driver and receiver
• Per channel, overall, and remote loop around
• Digital phase detector between E1 line and ST-BUS
• ST-BUS compatible
• Pin compatible with the MH89790
• Inductorless clock recovery
• Loss of Signal (LOS) indication
• Available in standard, narrow and surface mount formats
• Supports single supply rail operation


Application

• Primary rate ISDN network nodes
• Multiplexing equipment
• Private network: PBX to PBX links


Pinout




Specifications

	Parameter	Symbol	Min	Max	Units
1	Supply Voltage with respect to VSS	VDD	-0.3	7	V
2	Voltage on any pin other than supplies		VSS-0.3	VDD+0.3	V
3	Current at any pin other than supplies			40	mA
4	Storage Temperature	TST	-40	85	°C
5	Package Power Dissipation	P		800	mW

Description

The MH89790B is Mitel's CEPT PCM 30 interface solution, designed to meet the latest CCITT standards PCM 30 format with CRC-4. The MH89790B provides a complete interface between a 2.048 Mbit/sec digital trunk and Mitel's Serial Telecom Bus, the ST-BUS.

The MH89790B is a pin-compatible enhancement of the MH89790, permitting the removal of the tuneable inductor and inclusion of the external NAND gate used for generating RxD.