Datasheet

384
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
Note: 1. "Max" means the highest value where the pin is guaranteed to be read as low
2. "Min" means the lowest value where the pin is guaranteed to be read as high
3. Although each I/O port can sink more than the test conditions (20mA at V
CC
= 5V, 10mA at V
CC
= 3V) under steady state
conditions (non-transient), the following must be observed:
ATmega16U4/ATmega32U4:
1.)The sum of all IOL, for ports A0-A7, G2, C4-C7 should not exceed 100mA.
2.)The sum of all IOL, for ports C0-C3, G0-G1, D0-D7 should not exceed 100mA.
3.)The sum of all IOL, for ports G3-G5, B0-B7, E0-E7 should not exceed 100mA.
4.)The sum of all IOL, for ports F0-F7 should not exceed 100mA.
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current
greater than the listed test condition.
4. Although each I/O port can source more than the test conditions (20mA at V
CC
= 5V, 10mA at V
CC
= 3V) under steady
state conditions (non-transient), the following must be observed:
ATmega16U4/ATmega32U4:
I
IH
Input Leakage
Current I/O Pin
V
CC
= 5.5V, pin high
(absolute value)
1 µA
R
RST
Reset Pull-up Resistor 30 60
k
R
PU
I/O Pin Pull-up Resistor 20 50
I
CC
Power Supply Current
(6)
Active 4MHz, V
CC
= 3V
(ATmega16U4/ATmega32U4)
5
mA
Active 8MHz, V
CC
= 5V
(ATmega16U4/ATmega32U4)
10 15
Active 16MHz, V
CC
= 5V
(ATmega16U4/ATmega32U4)
27
Idle 4MHz, V
CC
= 3V
(ATmega16U4/ATmega32U4)
2
Idle 8MHz, V
CC
= 5V
(ATmega16U4/ATmega32U4)
6
Power-down mode
WDT enabled, V
CC
= 3V,
Regulator Disabled
<10 12
µA
WDT disabled, V
CC
=
3V,Regulator Disabled
1 5
V
ACIO
Analog Comparator
Input Offset Voltage
V
CC
= 5V
V
in
= V
CC
/2
<10 40 mV
I
ACLK
Analog Comparator
Input Leakage Current
V
CC
= 5V
V
in
= V
CC
/2
-50 50 nA
t
ACID
Analog Comparator
Propagation Delay
V
CC
= 2.7V
V
CC
= 4.0V
750
500
ns
Rusb
USB Series resistor
(external)
22±5% 
Vreg
Regulator Output
Voltage
C
UCAP
= 1µF ±20%,
UVcc  4.0V, I80mA
(7)
,
or
UVcc  3.4V, I55mA
(7)
3.0 3.3 3.6 V
Table 29-1. DC Characteristic, TA = -40°C to 85°C, VCC = 2.7V to 5.5V (unless otherwise noted)
Symbol Parameter Condition Min.
(5)
Typ. Max.
(5)
Units