ATC25 데이터 시트보기 (PDF) - Atmel Corporation

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ATC25

Cell-based ASIC

Atmel Corporation 

ATC25 Summary

Oscillator Cell

Library Osc25lib

Crystal Oscillators

Basic Analog Cell

Library ANA25lib,

ANA33lib

The Atmel Oscillator Library provides stable clock sources. It comprises four oscillators

and one power-on-reset.

The Atmel two-pad oscillators are designed with the Pierce three-point oscillator struc-

ture. For the 32.768 Hz oscillator, the load capacitance must be between 6 pF and 12.5

pF For high-frequency oscillators, the load capactance must be between 15 pF and 20

pF. External capacitors must be added in order to obtain the correct load capacitance.

Clock output is high at off state (onosc = 0).

The oscillators provide a bypass mode (onosc = 1), clock = not (xin).

Table 13 gives the available oscillator cells.

Table 13. Oscillator and POR Cells

Cell Name

Description

OSC25f33K

Low-power, optimized for 32.786 kHz crystal

OSC25f9M

9 MHz crystal oscillator

OSC25f16M

16 MHz crystal oscillator

OSC25f27M

27 MHz crystal oscillator

POR25

Static and dynamic reset with internal hysterisis

The Atmel CBIC analog library makes the following parts available:

• Multiplexer modules

– Multiplexers to minimize cross-talk (for use with high-impedance nodes).

– Multiplexers to minimize ON resistance.

• Analog input and output cells

• Analog power and ground cells

A special set of basic analog I/O cells, ANA33lib, is available for interfacing with external

3.3V devices.

7

1306DS–CBIC–09/02

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