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DAN-138 Datasheet(PDF) 2 Page - Exar Corporation

Part # DAN-138
Description  EXAR?셎 XR16L2550 AND XR16L2551 COMPARED
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

DAN-138 Datasheet(HTML) 2 Page - Exar Corporation

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DATA COMMUNICATIONS APPLICATION NOTE
DAN138
2
• The oscillator circuitry is similar and will operate in most cases, but there are some differences when using a
crystal oscillator and when using an external clock. See Figure 1 for the differences in the oscillator circuitry
for a crystal oscillator. When using an external clock input for frequencies greater than 24 MHz, Exar’s 2-
channel UARTs will require a 2K pull-up resistor on the XTAL2 pin.
1.2
BUS TIMING DIFFERENCES
• The TL16C752B requires that the -CS pin be asserted first before the -IOR or -IOW pin and the -IOR or -IOW
pin must be de-asserted before the -CS pin is de-asserted. During a read, the Exar 2-channel UARTs can
have either the -CS or the -IOR signal asserted first and have either signal be de-asserted first. The signals
are wire-ORed in the Exar 2-channel UARTs, therefore the second signal asserted will initiate the read cycle
and the first signal de-asserted terminates the read cycle. The same is true during a write for -CS and -IOW.
The flexibility of the Exar 2-channel UARTs timing can be important in DSP, ARM, and MIPS designs. Also,
because of this flexibility, the Exar 2-channel UARTs will work with the timing used for the TL16C752B.
FIGURE 1. CRYSTAL OSCILLATOR CIRCUITRY DIFFERENCES
C1
10-30 pF
C2
40-60 pF
Y1
1.8432
MHz
to
24
MHz
R1
1.5 K
R2
1 ΜΩ
XTAL1
XTAL2
C1
22-47 pF
C2
22-47 pF
Y1
1.8432
MHz
to
24
MHz
R1
0-120
(Optional)
R2
500 ΚΩ − 1 ΜΩ
XTAL1
XTAL2
XR16L2550
XR16L2551
TL16C752B


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