MA808

Supply voltage, V_DD-V_SS ..................- 0.3 to + 7.0V
Voltage on any pin (V_IN) (See note 1) ......V_SS - 0.3V to V_DD + 0.3V
Current through any pin (See note 1) ..............± 20mA
Storage temperature................. -55°C to + 125°C
Operating temperature range ..............-10°C to+55°C
NOTES 1. Guaranteed no latch-up conditions. 2. Stresses above those listed in the Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions, or at any other condition above those indicated in the Electrical Characteristics, is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

The MA808 Frame Aligner chip has been primarily designed for use in equipment operating at the CCITT standard of 2048 kbit/s tor 30 channel PCM data signals.

The basic function of the device MA808 is to accept a 2048 kbit/s data signal, whose frame structure conforms to CCITT recommendation G732 and frame synchronously align it to a local exchange/system clock.

The MA808 frame aligner operation is such that once a synchronisation sequence, as defined in CCITT recommendation G732, is received from a distant source synchronisation is established. Consequently the data stream is delayed such as to align it to the timing required at the local source. Once three successive sync. words are received containing errors, synchronisation is lost. The chip will remain out of sync. until the synchronising sequence is received.

The device MA808 can also, when configured in the 'enhanced mode' perform the additional function of time slot zero recovery.

A number of facilities MA808 are also provided to simplify the testing of the device and associated system.