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SCC2681T Datasheet(PDF) 11 Page - NXP Semiconductors |
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SCC2681T Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 15 page ![]() Philips Semiconductors Product data SCC2681T Dual asynchronous receiver/transmitter (DUART) 2004 Apr 06 11 X1/CLK CTCLK RxC TxC tCLK tCTC tRx tTx tCLK tCTC tRx tTx +5 V R1 1 k Ω X1 X2 C1 = C2 = 24 pF FOR CL = 20 pF X1 X2 3.6864 MHz 3 pF 4 pF 50 TO 150 k Ω TO INTERNAL CLOCK DRIVERS SCC2681T NOTE: C1 AND C2 SHOULD BE BASED ON MANUFACTURER’S SPECIFICATION. PARASITIC CAPACITANCE SHOULD BE INCLUDED WITH C1 AND C2. R1 IS ONLY REQUIRED IF U1 WILL NOT DRIVE TO X1 INPUT LEVELS TYPICAL CRYSTAL SPECIFICATION FREQUENCY: 2 – 4 MHz LOAD CAPACITANCE (CL): 12 – 32 pF TYPE OF OPERATION: PARALLEL RESONANT, FUNDAMENTAL MODE NC SD00726 RESISTOR REQUIRED WHEN U1 IS A TTL DEVICE U1 Figure 7. Clock Timing SD00103 TxD TxC (INPUT) TxC (1X OUTPUT) tTXD tTCS 1 BIT TIME (1 OR 16 CLOCKS) Figure 8. Transmit tRXS RxC (1X INPUT) RxD tRXH SD00104 |
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