Datasheet

181
7701F–AVR–10/12
Atmel ATtiny24/44/84 [Preliminary]
22.4 System and Reset Characterizations
Notes: 1. Values are guidelines only.
2. This is the limit to which VDD can be lowered without losing RAM data
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 guarantees that a Brown-out Reset will occur before V
CC
drops to a voltage where cor-
rect operation of the microcontroller is no longer guaranteed.
Table 22-4. Reset, Brown-out and Internal Voltage Reference Characteristics
(1)
Symbol Parameter Condition Min Typ Max Units
V
HYST
Brown-out Detector Hysteresis 100 250 mV
V
RAM
2.
RAM Retention Voltage
(1)
50 mV
t
BOD
Min Pulse Width on Brown-out Reset 2 ns
V
BG
Bandgap reference voltage V
C C
= 2.7V, T
A
= 25°C 1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time V
C C
= 2.7V, T
A
= 25°C 40 70 µs
I
BG
Bandgap reference current consumption V
C C
= 2.7V, T
A
= 25°C 10 µA
Table 22-5. BODLEVEL Fuse Coding
(1)
BODLEVEL [2..0] Fuses Min V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.8
V
101 2.5 2.7 2.9
100 4.0 4.3 4.6
011 2.3
010 2.2
001 1.9
000 2.0