3

4115L–AERO–06/05

MG2RT

I/O Buffer Interfacing

I/O Flexibility

All I/O buffers may be configured as input, output, bi-directional, oscillator or supply. A level

translator is located close to each buffer.

Inputs

Input buffers with CMOS or TTL thresholds are non-inverting and feature versions with and with-

out hysteresis. The CMOS and TTL input buffers may incorporate pull-up or pull down

terminators. For special purposes, a buffer allowing direct input to the matrix core is available.

Outputs

Several kinds of CMOS and TTL output drivers are offered: fast buffers with 3, 6, 12 and 24 mA

drive at 5V, low noise buffers with 12 mA drive at 5V.

Clock Generation and PLL

Clock Generation

Atmel offers 6 different types of oscillators: 4 high frequency crystal oscillators and 2 RC oscilla-

tors. For all devices, the mark-space ratio is better than 40/60 and the start-up time less than 10

ms.

PLL

Contact factory.

Oscillators

Frequency (MHz)

Typical Consumption (mA)

Max 5V

Max 3V

5V

3V

Xtal 7M

12

7

1.2

0.4

Xtal 20M

28

17

2.5

0.8

Xtal 50M

70

40

7

2

Xtal 100M

130

75

16

5

RC 10M

10

10

2

1

RC 32M

32

32

3

1.5