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M3488B1-M3488Q1
256 X 256 DIFGITAL SWITCHING MATRIX
M3488November 1994
256 x 256 DIGITAL SWITCHING MATRIX
PRELIMINARY DATA256 INPUT AND 256 OUTPUT CHANNEL
CMOS DIGITAL SWITCHING MATRIX COM-
PATIBLE WITH M088.BUILDING BLOCK DESIGNED FOR LARGE
CAPACITY ELECTRONIC EXCHANGES, SUB-
SYSTEMS AND PABX.NO EXTRA PIN NEEDED FOR NOT-BLOCK-
ING SINGLE STAGE AND HIGHER CAPACITY
SYNTHESIS BLOCKS (512 or 1024 channels).EUROPEAN TELEPHONE STANDARD COM-
PATIBLE (32 serial channels per frame).PCM INPUTS AND OUTPUTS MUTUALLY
COMPATIBLE.ACTUAL INPUT-OUTPUT CHANNEL CON-
NECTIONS STORED AND MODIFIED VIA AN
ON CHIP 8-BIT PARALLEL MICROPROCES-
SOR INTERFACE.TYPICAL BIT RATE : 2Mbit/s.TYPICAL SYNCHRONIZATION RATE : 8KHz
(time frame is 125μs).5V P0WER SUPPLY .CMOS & TTL INPUT/OUTPUT LEVELS COM-
PATIBLE.HIGH DENSITY ADVANCED 1.2μm HCMOS3
PROCESS
Main instructions controlled by the microproc-
essor interface.CHANNEL CONNECTION/DISCONNECTION.OUTPUT CHANNEL DISCONNECTION.INSERTION OF A BYTE ON A PCM OUTPUT
CHANNEL/DISCONNECTION.TRANSFER TO THE MICROPROCESSOR OF
A SINGLE PCM OUTPUT CHANNEL SAMPLE.TRANSFER TO THE MICROPROCESSOR OF
A SINGLE OUTPUT CHANNEL CONTROL
WORD.TRANSFER TO THE MICROPROCESSOR OF
A SELECTED 0 CHANNEL PCM INPUT DATA
ABSOLUTE MAXIMUM RATINGSStresses above those listed under " Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress
ratings only and functional operation of the device at these or any other conditions above those indicated in the operating con-
ditions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
1/18
PIN CONNECTIONS (Top views)
EXCHANGE NETWORKS APPLICATIONS256 PCM links network (160 or 192 DSM) : the 32 x 32 link module shown on the next page.
2048 PCM links network (1792 or 2048 DSM) : the 256 x 256 link network is shown above.
M34882/18
EXCHANGE NETWORKS APPLICATIONS (continued)Single Stage/Sixteen Devices Configuration (32 by 32 links or 1024 channels).
M34883/18
BLOCK DIAGRAM
M34884/18
RECOMMENDED OPERATING CONDITIONS
CAPACITANCES (measurement freq. = 1MHz; Top = 0 to 70°C; unused pins tied to VSS)
D.C. ELECTRICAL CHARACTERISTICS (Tamb = 0 to 70°C, VCC = 5V ±5%)
All D.C. characteristics are valid 250μs after VCC and clock have been applied.
(*) The pin number is referred to the DIP40 version.
M34885/18
