XR16M681IB25 datasheet(10/51 Pages) EXAR

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XR16M681IB25 Datasheet(PDF) 10 Page - Exar Corporation

Part #	XR16M681IB25

Description	1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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10 / 51 page

XR16M681

1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE

REV. 1.0.1

2.6

Crystal Oscillator or External Clock Input

The M681 includes an on-chip oscillator to produce a clock for the baud rate generators in the device when a

crystal is connected between XTAL1 and XTAL2 as show below. The CPU data bus does not require this clock

for bus operation. The crystal oscillator provides a system clock to the Baud Rate Generators (BRGs) in the

UART. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. For

programming details, see “Section 2.7, Programmable Baud Rate Generator with Fractional Divisor” on

page 11.

FIGURE 6. TYPICAL CRYSTAL CONNECTIONS

22-47pF

1.8432 MHz

24 MHz

0-120

(Optional)

500K - 1M

XTAL1

XTAL2

The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,

fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency

tolerance) connected externally between the XTAL1 and XTAL2 pins. Typical oscillator connections are shown

in Figure 6. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate

generator for standard or custom rates. The BGA package has XTAL1 only, the external clock is required. For

further reading on oscillator circuit, see application note DAN108 on EXAR’s web site.

Manufacturer	Part #	Datasheet	Description
Exar Corporation	XR16M680	1Mb / 57P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
	XR16M680IB25	1Mb / 57P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
	XR16M680IL32	1Mb / 57P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
	XR16M680IM48	1Mb / 57P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO

Manufacturer	Part #	Datasheet	Description
Exar Corporation	XR16M781	1Mb / 52P	1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
	XR16M781IL32-F	1Mb / 52P	1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
	XR16M581	1Mb / 51P	1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE
	XR16M564	1Mb / 55P	1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO
	XR16M670	985Kb / 52P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
	XR16M680	1Mb / 57P	1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
	XR16M698	1Mb / 58P	1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 32-BYTE FIFO
	XR16M654DIV-0B	1Mb / 58P	1.62V TO 3.63V QUAD UART WITH 64-BYTE FIFO
	XR16M554	867Kb / 46P	1.62V TO 3.63V QUAD UART WITH 16-BYTE FIFO
	XR16M654	1Mb / 58P	1.62V TO 3.63V QUAD UART WITH 64-BYTE FIFO

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