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97CFDC Datasheet(PDF) 10 Page - SMSC Corporation |
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97CFDC Datasheet(HTML) 10 Page - SMSC Corporation |
10 / 20 page SMSC DS – USB97CFDC Page 10 Rev. 12/15/2000 BUFFER TYPE DESCRIPTIONS Table 1 - USB97CFDC Buffer Type Descriptions BUFFER DESCRIPTION I Input IS Input with Schmitt trigger O8 Output with 8mA drive I/O8 Input/output with 8mA drive OD12 Open drain….12mA sink O24 Output with 24mA drive OD24 Open drain….24mA sink ICLKx XTAL clock input OCLKx XTAL clock output I/O-U See Table 6. BOARD TEST MODE OPERATION By driving the nTESTEN pin low, the device will be placed into a special test mode to allow verification of attachment of the device to the circuit board. Every pin except the TSTOUT, XTAL2, and the power and ground pins become an input to an XNOR chain, as shown below, to allow continuity to be tested on the board. This test should individually toggle the state of the trace connected to the pin being examined for continuity, and the TSTOUT pin monitored for toggle of state. If no toggle occurs, either the pin under test is discontinuous, or the TSTOUT pin is not connected on the board Pin1 Pin2 Pin3 Pin100 TSTOUT |
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