ATtiny44 datasheet(178/236 Pages) ATMEL

178 / 236 page

178

8006H–AVR–10/09

ATtiny24/44/84

Two versions of power-on reset have been implemented, as follows.

20.5.1

Standard Power-On Reset

This implementation of power-on reset existed in early versions of ATtiny24/44/84. The table

below describes the characteristics of this power-on reset and it is valid for the following devices,

only:

• ATtiny24, revision D, and older

• ATtiny44, revision C, and older

• ATtiny84, revision A

Note:

Revisions are marked on the package (packages 14P3 and 14S1: bottom, package 20M1: top)

Note:

1. Values are guidelines, only

2. Threshold where device is released from reset when voltage is rising

3. The power-on reset will not work unless the supply voltage has been below VPOA

20.5.2

Enhanced Power-On Reset

This implementation of power-on reset exists in newer versions of ATtiny24/44/84. The table

below describes the characteristics of this power-on reset and it is valid for the following devices,

only:

• ATtiny24, revision E, and newer

• ATtiny44, revision D, and newer

• ATtiny84, revision B, and newer

Note:

1. Values are guidelines, only

2. Threshold where device is released from reset when voltage is rising

3. The Power-on Reset will not work unless the supply voltage has been below VPOA

Table 20-5.

Characteristics of Standard Power-On Reset. T

A = -40 - 85°C

Symbol

Parameter

Min

(1)

Typ

(1)

Max

(1)

Units

VPOR

Release threshold of power-on reset (2)

0.7

1.0

1.4

VPOA

Activation threshold of power-on reset (3)

0.05

0.9

1.3

SRON

Power-on slope rate

0.01

4.5

V/ms

Table 20-6.

Characteristics of Enhanced Power-On Reset. T

A = -40 - 85°C

Symbol

Parameter

Min

(1)

Typ

(1)

Max

(1)

Units

VPOR

Release threshold of power-on reset (2)

1.1

1.4

1.6

VPOA

Activation threshold of power-on reset (3)

0.6

1.3

1.6

SRON

Power-On Slope Rate

0.01

V/ms

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