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XRT16L2552 Datasheet(PDF) 11 Page - Exar Corporation |
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XRT16L2552 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 47 page xr XR16L2552 REV. 1.1.1 2.25V TO 5.5V DUART WITH 16-BYTE FIFO 11 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. The L2552 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. Table 5 shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X sampling rate. When using a non-standard frequency crystal or external clock, the divisor value can be calculated for DLL/DLM with the following equation. FIGURE 6. OPERATING FREQUENCY CHART. REQUIRES A 2K OHMS PULL-UP RESIS- TOR ON XTAL2 PIN TO INCREASE OPERATING SPEED divisor (decimal) = (XTAL1 or External clock frequency ) / (serial data rate x 16) TABLE 5: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK OUTPUT Data Rate MCR Bit-7=0 DIVISOR FOR 16x Clock (Decimal) DIVISOR FOR 16x Clock (HEX) DLM PROGRAM VALUE (HEX) DLL PROGRAM VALUE (HEX) DATA RATE ERROR (%) 400 2304 900 09 00 0 2400 384 180 01 80 0 4800 192 C0 00 C0 0 9600 96 60 00 60 0 19.2k 48 30 00 30 0 38.4k 24 18 00 18 0 76.8k 12 0C 00 0C 0 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 XR16L2552 with external clock and a 2K ohms pull-up resistor on XTAL2 pin. |
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Similar Description - XRT16L2552 |
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