AT89C55WD Atmel Corporation, AT89C55WD Datasheet - Page 26

• Manufacturer Part Number: AT89C55WD
• Manufacturer: Atmel Corporation

Specifications of AT89C55WD

• Flash (kbytes): 20 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 4.0 to 6.0
• Timers: 3
• Watchdog: Yes

26. Absolute Maximum Ratings*
27. DC Characteristics
The values shown in this table are valid for T
Notes:
26
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
Symbol
V
V
V
V
V
V
V
V
I
I
I
RRST
C
I
IL
TL
LI
CC
OL
OL1
OH
OH1
IL
IL1
IH
IH1
IO
1. Under steady state (non-transient) conditions, I
2. Minimum V
AT89C55WD
Maximum I
Maximum I
Port 0: 26 mA
Maximum total I
If I
than the listed test conditions.
Parameter
Input Low Voltage
Input Low Voltage (EA)
Input High Voltage
Input High Voltage
Output Low Voltage
Output Low Voltage
Output High Voltage
(Ports 1,2,3, ALE, PSEN)
Output High Voltage
(Port 0 in External Bus Mode)
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
Power-down Mode
OL
exceeds the test condition, V
OL
OL
CC
per port pin: 10 mA
per 8-bit port:
for Power-down is 2V.
OL
for all output pins: 71 mA
(1)
Ports 1, 2, 3: 15 mA
(1)
(1)
(Ports 1,2,3)
(Port 0, ALE, PSEN)
OL
A
may exceed the related specification. Pins are not guaranteed to sink current greater
= -40°C to 85°C and V
OL
Condition
(Except EA)
(Except XTAL1, RST)
(XTAL1, RST)
I
I
I
I
I
I
I
I
V
V
0.45 < V
Test Freq. = 1 MHz, T
Active Mode, 12 MHz
Idle Mode, 12 MHz
V
must be externally limited as follows:
OL
OL
OH
OH
OH
OH
OH
OH
IN
IN
CC
= 1.6 mA
= 3.2 mA
= -60 µA, V
= -25 µA
= -10 µA
= -800 µA, V
= -300 µA
= -80 µA
= 0.45V
= 2V, V
= 5.5V
IN
*NOTICE:
< V
CC
= 5V ± 10%
CC
CC
CC
CC
= 4.0V to 5.5V, unless otherwise noted.
= 5V ± 10%
= 5V ± 10%
A
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.
= 25°C
0.2 V
0.75 V
0.75 V
0.7 V
0.9 V
0.9 V
Min
-0.5
-0.5
2.4
2.4
10
CC
CC
CC
CC
+0.9
CC
CC
0.2 V
0.2 V
V
V
CC
CC
Max
-650
0.45
0.45
100
-50
±10
6.5
30
10
25
CC
CC
+0.5
+0.5
1921D–MICRO–6/08
-0.1
-0.3
Units
mA
mA
µA
µA
µA
kΩ
pF
µA
V
V
V
V
V
V
V
V
V
V
V
V