MT8976AC

The MT8976AC is a kind of Mitel's second generation T1 interface solution. The device meets the Extended Super Frame format (ESF), the current D3/D4 format and is compatible with SLC-96 systems. In addition, the device interfaces to DS1 1.544 Mbit/sec digital trunk. The typical applications include DS1/ESF digital trunk interfaces, computer to PBX interfaces (DMI and CPI) and high speed computer to computer data links. It is available in 28 pin ceramic DIP package.

There are some features as follows: (1)D3/D4 or ESF framing and SLC-96 compatible; (2)2 frame elastic buffer with 32 msec jitter buffer; (3)insertion and detection of A, B,C,D bits. Signalling freeze, optional debounce; (4)selectable B8ZS, jammed bit (ZCS) or no zero code suppression; (5)yellow alarm and blue alarm signal capabilities; (6)bipolar violation count, FT error count, CRC error count; (7)selectable robbed bit signalling; (8)frame and superframe sync. signals, Tx and Rx; (9)AMI encoding and decoding; (10)per channel, overall, and remote loop around; (11)digital phase detector between T1 line & ST-BUS; (12)one uncommitted scan point and drive point; (13)pin compatible with MT8977 and MT8979; (14)ST-BUS compatible.

What comes next is about the absolute maximum ratings: (1)power supplies with respect to VSS, VDD: -0.3 to 7 V; (2)voltage on any pin other than supplies: VSS-0.3 to VDD+0.3 V; (3)current at any pin other than supplies: 40 mA; (4)storage temperature, TST: -55 to 125; (5)package power dissipation, P: 800 mW. Then is about the recommended operating conditions (voltages are with respect to ground (VSS) unless otherwise stated) for inputs: (1)operating temperature, TOP: -40 to 85; (2)power supplies, VDD: 4.5 V min, 5.0 V typ and 5.5 V max; (3)input high voltage, VIH: 2.4 V min and VDD V max for 400 mV noise margin; (4)input low voltage, VIL: VSS V min and 0.4 V max for 400 mV noise margin.