73M2901/5V Advanced Single Chip Modem
PIN DESCRIPTIONS (continued)
OSCILLATOR PIN DESCRIPTION
PIN NAME | TYPE | DESCRIPTION | ||
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OSCIN | 24 | 26 | I | Crystal input for internal oscillator, also input for external |
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OSCOUT | 23 | 25 | O | Crystal oscillator output. |
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DIGITAL INTERFACE PIN DESCRIPTION |
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PIN NAME | TYPE | DESCRIPTION | ||
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RESET | 13 | 9 | I | Resets 73M2901/5V |
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RXCLK | 31 | 36 | O | Receive Data Synchronous Clock |
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RXD | 30 | 35 | O | Serial output to DTE. |
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TXCLK | 28 | 31 | O | Transmit Data Synchronous Clock |
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TXD | 27 | 30 | I | Serial data input from DTE. |
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USR10 | 12 | 8 | I/O | This pin can optionally be configured as an active low detect |
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| pin. This can be used to implement such functions as “parallel- |
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USR11 | 11 | 7 | I/O | Programmable I/O port. This pin can ooptionnaly be used to |
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| control an external switch for Caller ID decoding operations. |
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RTS (USR12) | 10 | 6 | I | Request to Send |
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CTS (USR13) | 9 | 5 | O | Clear to Send |
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DSR (USR14) | 8 | 4 | O | Data Set Ready |
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DCD (USR15) | 7 | 3 | O | Data Carrier Detect |
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RI (USR16) | 4 | 43 | O | Ring Indicator |
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RELAY (USR17) | 3 | 40 | O | Relay driver output |
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