AT89C51
Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V to +7.0V
Maximum Operating Voltage............................................. 6.6V
DC Output Current...................................................... 15.0 mA
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
DC Characteristics
T
A
= -40°C to 85°C, V
CC
= 5.0V
±
20% (unless otherwise noted)
Symbol
V
IL
V
IL1
V
IH
V
IH1
V
OL
V
OL1
V
OH
Parameter
Input Low Voltage
Input Low Voltage (EA)
Input High Voltage
Input High Voltage
Output Low Voltage
(1)
(Ports 1,2,3)
Output Low Voltage
(1)
(Port 0, ALE, PSEN)
Output High Voltage
(Ports 1,2,3, ALE, PSEN)
(Except XTAL1, RST)
(XTAL1, RST)
I
OL
= 1.6 mA
I
OL
= 3.2 mA
I
OH
= -60
µA,
V
CC
= 5V
±
10%
I
OH
= -25
µA
I
OH
= -10
µA
V
OH1
Output High Voltage
(Port 0 in External Bus Mode)
I
OH
= -800
µA,
V
CC
= 5V
±
10%
I
OH
= -300
µA
I
OH
= -80
µA
I
IL
I
TL
I
LI
RRST
C
IO
I
CC
Logical 0 Input Current (Ports 1,2,3)
Logical 1 to 0 Transition Current
(Ports 1,2,3)
Input Leakage Current (Port 0, EA)
Reset Pulldown Resistor
Pin Capacitance
Power Supply Current
Test Freq. = 1 MHz, T
A
= 25°C
Active Mode, 12 MHz
Idle Mode, 12 MHz
Power Down Mode
(2)
V
CC
= 6V
V
CC
= 3V
V
IN
= 0.45V
V
IN
= 2V, VCC = 5V
±
10%
0.45 < V
IN
< V
CC
50
2.4
0.75 V
CC
0.9 V
CC
2.4
0.75 V
CC
0.9 V
CC
-50
-650
±10
300
10
20
5
100
40
Condition
(Except EA)
Min
-0.5
-0.5
0.2 V
CC
+ 0.9
0.7 V
CC
Max
0.2 V
CC
- 0.1
0.2 V
CC
- 0.3
V
CC
+ 0.5
V
CC
+ 0.5
0.45
0.45
Units
V
V
V
V
V
V
V
V
V
V
V
V
µA
µA
µA
KΩ
pF
mA
mA
µA
µA
Notes:
1. Under steady state (non-transient) conditions, I
OL
must be externally limited as follows:
Maximum I
OL
per port pin: 10 mA
Maximum I
OL
per 8-bit port: Port 0: 26 mA
Ports 1, 2, 3: 15 mA
Maximum total I
OL
for all output pins: 71 mA
If I
OL
exceeds the test condition, V
OL
may exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test conditions.
2. Minimum V
CC
for Power Down is 2V.
4-37
ATMEL [ ATMEL CORPORATION ]
