Datasheet

202
8246B–AVR–09/11
ATtiny2313A/4313
22.5.1 Enhanced Power-On Reset
Notes: 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
POA
.
22.5.2 Brown-Out Detection
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.
22.6 Analog Comparator Characteristics
Note: All parameters are based on simulation results and they are not tested in production
Table 22-4. Characteristics of Enhanced Power-On Reset. T
A
= -40 – 85°C
Symbol Parameter Min
(1)
Typ
(1)
Max
(1)
Units
V
POR
Release threshold of power-on reset
(2)
1.1 1.4 1.6 V
V
POA
Activation threshold of power-on reset
(3)
0.6 1.3 1.6 V
SR
ON
Power-On Slope Rate 0.01 V/ms
Table 22-5. V
BOT
vs. BODLEVEL Fuse Coding
BODLEVEL [1:0] Fuses Min
(1)
Typ
(1)
Max
(1)
Units
11 BOD Disabled
10 1.7 1.8 2.0
V01 2.5 2.7 2.9
00 4.1 4.3 4.5
Table 22-6. Analog Comparator Characteristics, T
A
= -40°C - 85°C
Symbol Parameter Condition Min Typ Max Units
V
ACIO
Input Offset Voltage V
CC
= 5V, V
IN
= V
CC
/ 2 < 10 40 mV
I
ACLK
Input Leakage Current V
CC
= 5V, V
IN
= V
CC
/ 2 -50 50 nA
t
ACPD
Analog Propagation Delay
(from saturation to slight overdrive)
V
CC
= 2.7V 750
ns
V
CC
= 4.0V 500
Analog Propagation Delay
(large step change)
V
CC
= 2.7V 100
V
CC
= 4.0V 75
t
DPD
Digital Propagation Delay V
CC
= 1.8V - 5.5 1 2 CLK