Rainbow Electronics AT89C55WD - Manual (Page 28)

28
AT89C55WD
1921B–MICRO–09/02
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.
Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125°C *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.
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
DC Characteristics
The values shown in this table are valid for T
A
= -40°C to 85°C and V
CC
= 4.0V to 5.5V, unless otherwise noted.
Symbol Parameter Condition Min Max Units
V
IL
Input Low Voltage (Except EA) -0.5 0.2 V
CC
-0.1 V
V
IL1
Input Low Voltage (EA) -0.5 0.2 V
CC
-0.3 V
V
IH
Input High Voltage (Except XTAL1, RST) 0.2 V
CC
+0.9 V
CC
+0.5 V
V
IH1
Input High Voltage (XTAL1, RST) 0.7 V
CC
V
CC
+0.5 V
V
OL
Output Low Voltage (1) (Ports 1,2,3) I
OL
= 1.6 mA 0.45 V
V
OL1
Output Low Voltage (1) (Port 0, ALE, PSEN) I
OL
= 3.2 mA 0.45 V
V
OH
Output High Voltage
(Ports 1,2,3, ALE, PSEN)
I
OH
= -60 µA, V
CC
= 5V ± 10% 2.4 V
I
OH
= -25 µA 0.75 V
CC
V
I
OH
= -10 µA 0.9 V
CC
V
V
OH1
Output High Voltage
(Port 0 in External Bus Mode)
I
OH
= -800 µA, V
CC
= 5V ± 10% 2.4 V
I
OH
= -300 µA 0.75 V
CC
V
I
OH
= -80 µA 0.9 V
CC
V
I
IL
Logical 0 Input Current (Ports 1,2,3) V
IN
= 0.45V -50 µA
I
TL
Logical 1 to 0 Transition Current (Ports 1,2,3) V
IN
= 2V, V
CC
= 5V ± 10% -650 µA
I
LI
Input Leakage Current (Port 0, EA) 0.45 < V
IN
< V
CC
±10 µA
RRST Reset Pulldown Resistor 10 30 k Ω
C
IO
Pin Capacitance Test Freq. = 1 MHz, T
A
= 25°C 10 pF
I
CC
Power Supply Current
Active Mode, 12 MHz 25 mA
Idle Mode, 12 MHz 6.5 mA
Power-down Mode (1) V
CC
= 5.5V 100 µA