Rainbow Electronics ATtiny861_V - Manual (Page 189)

189
2588B–AVR–11/06
ATtiny261/461/861
23.5 System and Reset Characteristics
Notes: 1. Values are guidelines only. Actual values are TBD.
2. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Note: 1. V
BOT
may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to V
CC
= V
BOT
during the production test. This guar-
antees that a Brown-out Reset will occur before V
CC
drops to a voltage where correct
operation of the microcontroller is no longer guaranteed.
Table 23-3. Reset, Brown-out and Internal Voltage Characteristics (1)
Symbol Parameter Condition Min Typ Max Units
V
POT
Power-on Reset Threshold
Voltage (rising)
T
A
= -40 - 85
°C
0.7 1.0 1.4 V
Power-on Reset Threshold
Voltage (falling)
(2)
T
A
= -40 - 85
°C
0.6 0.9 1.3 V
V
RST
RESET Pin Threshold
Voltage
V
CC
= 3V 0.2 V
CC
0.9 V
CC
V
t
RST
Minimum pulse width on
RESET Pin
V
CC
= 3V 2.5 µs
V
HYST
Brown-out Detector
Hysteresis
50 mV
t
BOD
Min Pulse Width on Brown-
out Reset
2 µs
V
BG
Bandgap reference voltage
V
CC
= 2.7V,
T
A
= 25°C
1.0 1.1 1.2 V
t
BG
Bandgap reference start-up
time V
CC
= 2.7V,
T
A
= 25°C
40 70 µs
I
BG
Bandgap reference current
consumption V
CC
= 2.7V,
T
A
= 25°C
15 µA
Table 23-4. BODLEVEL Fuse Coding (1)
BODLEVEL [2..0] Fuses Min V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0
V 101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000