attiny25v ATMEL Corporation, attiny25v Datasheet - Page 170

• Manufacturer Part Number: attiny25v
• Description: Microcontroller With 2/4/8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

21.5
21.5.1
170
System and Reset Characteristics
ATtiny25/45/85
Standard Power-On Reset
Table 21-4.
Note:
Two versions of power-on reset have been implemented, as follows.
This implementation of power-on reset existed in early versions of ATtiny25/45/85. The table
below describes the characteristics of this power-on reset and it is valid for the following devices,
only:
Note:
Table 21-5.
Note:
• ATtiny25, revision D, and older
• ATtiny45, revision F, and older
• ATtiny85, revision B, and newer
Symbol
Symbol
V
V
SR
V
V
t
t
V
t
I
RST
HYST
BOD
POR
POA
RST
BG
BG
BG
ON
1. Values are guidelines only.
Revisions are marked on the package (packages 8P3 and 8S2: bottom, package 20M1: top)
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 V
Parameter
Release threshold of power-on reset
Activation threshold of power-on reset
Power-on slope rate
Parameter
Minimum pulse width on
RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on
Brown-out Reset
Bandgap reference
voltage
Bandgap reference
start-up time
Bandgap reference
current consumption
RESET Pin Threshold Voltage
Reset, Brown-out and Internal Voltage Characteristics
Characteristics of Standard Power-On Reset.
Condition
V
V
V
T
V
T
V
T
(2)
A
A
A
CC
CC
CC
CC
CC
(3)
= 25°C
= 25°C
= 25°C
= 3V
= 3V
= 5.5V
= 2.7V
= 2.7V
0.2 V
Min
1.0
Min
T
0.05
0.01
A
0.7
(1)
CC
= -40 - 85°C
(1)
Typ
1.1
Typ
50
40
15
2
1.0
0.9
(1)
(1)
0.9 V
Max
Max
2.5
1.2
70
1.4
1.3
4.5
POA
2586K–AVR–01/08
(1)
CC
(1)
Units
Units
V/ms
mV
µA
µs
µs
µs
V
V
V
V