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ST16C2552 データシート(PDF) 10 Page - Exar Corporation |
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ST16C2552 データシート(HTML) 10 Page - Exar Corporation |
10 / 36 page ST16C2552 10 2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO REV. 4.2.1 2.9 Programmable Baud Rate Generator A single baud rate generator is provided for the transmitter and receiver, allowing independent TX/RX channel control. The programmable Baud Rate Generator is capable of operating with a crystal frequency of up to 24 MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2 pin (as shown in Figure 5) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and 5.0V. FIGURE 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE To obtain maximum data rate, it is necessary to use full rail swing on the clock input. See external clock operating frequency over power supply voltage chart in Figure 6. FIGURE 6. OPERATING FREQUENCY CHART. REQUIRES A 2K OHMS PULL-UP RESISTOR ON XTAL2 PIN TO INCREASE OPERATING SPEED . The 2552 divides the basic external clock by 16. The basic 16X clock provides table rates to support standard and custom applications using the same system design. The Baud Rate Generator divides this 16X clock by any divisor from 1 to 216 -1. The rate table is configured via the DLL and DLM internal register functions. Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections of baud rate generator. 2K XTAL1 XTAL2 R1 VCC External Clock vcc gnd 60 50 40 30 3.0 4.5 5.5 3.5 4.0 5.0 Suppy Voltage 70 80 85oC 25oC -40oC Operating frequency for ST16C2550 with external clock and a 2K ohms pull-up resistor on XTAL2 pin. |
同様の部品番号 - ST16C2552_06 |
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同様の説明 - ST16C2552_06 |
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