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HT9315CL Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT9315CL Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
4 / 27 page Pin Name I/O Internal Connection Description HFI I CMOS IN Pull-Low This pin is a Schmitt trigger input structure. Active high. Applying a positive pulse to HFI can toggle the HFO once and hence control the hand-free function. The pull-low resistance of HFI is 200k W typ. An external RC network is recommended for input debouncing. HFO O CMOS OUT The HFO is a CMOS output structure. Its output is toggle- controlled by a positive transition on HFI pin. When HFO is high, the hand-free function is enabled and PO outputs a high to connect the line. The hand-free function can be released by setting HDO high or by an on-off-hook op- eration or by another HFI input. Refer to the functional description for the hand-free functional operation. DOUT O NMOS OUT NMOS open drain output pin. It outputs the BCD code of the dialing digits to the LCD driver chip (HT16XX series) or MCU for dialing number display. Refer to the functional description for the detailed timing. CLOCK O NMOS OUT NMOS open drain output. When dialing, it outputs a series of pulse trains for DOUT data synchronization. DOUT data is valid at the falling edge of the clock. VDD ¾¾ Positive power supply, 2.0V~5.5V for normal operation VSS ¾¾ Negative power supply, ground Approximate internal connection circuits Absolute Maximum Ratings Supply Voltage ........................................... -0.3V to 6V Input Voltage .............................. VSS -0.3 to VDD+0.3V Storage Temperature ........................... -50°Cto125°C Operating Temperature .......................... -20°Cto75°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil- ity. HT9315 Series Rev. 1.20 4 October 1, 2002 N M O S O U T V D D C M O S I N / O U T C M O S I N P u l l - L o w C M O S I N P u l l - H i g h C M O S I N O S C I L L A T O R X 1 X 2 E N 1 0 M 2 0 P 1 0 P C M O S O U T V D D |
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