AT89C55WD-24AI datasheet(26/35 Pages) ATMEL

26 / 35 page

1921C–MICRO–3/05

AT89C55WD

Notes:

1. Under steady state (non-transient) conditions, IOL 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 IOL for all output pins: 71 mA

If IOL exceeds the test condition, VOL 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.

26. 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

27. DC Characteristics

The values shown in this table are valid for T

A = -40°C to 85°C and VCC = 4.0V to 5.5V, unless otherwise noted.

Symbol

Parameter

Condition

Min

Max

Units

Input Low Voltage

(Except EA)-0.5

0.2 V

CC-0.1

VIL1

Input Low Voltage (EA)-0.5

0.2 VCC-0.3

Input High Voltage

(Except XTAL1, RST)

0.2 V

CC+0.9

CC+0.5

IH1

Input High Voltage

(XTAL1, RST)

0.7 V

CC+0.5

VOL

Output Low Voltage

(1) (Ports 1,2,3)

IOL = 1.6 mA

0.45

OL1

Output Low Voltage

(1) (Port 0, ALE, PSEN)I

OL = 3.2 mA

0.45

VOH

Output High Voltage

(Ports 1,2,3, ALE, PSEN)

OH = -60 µA, VCC = 5V ± 10%

2.4

IOH = -25 µA

0.75 VCC

OH = -10 µA

0.9 V

VOH1

Output High Voltage

(Port 0 in External Bus Mode)

OH = -800 µA, VCC = 5V ± 10%

2.4

IOH = -300 µA

0.75 VCC

OH = -80 µA

0.9 V

Logical 0 Input Current (Ports 1,2,3)

IN = 0.45V

-50

µA

ITL

Logical 1 to 0 Transition Current (Ports 1,2,3)

VIN = 2V, VCC = 5V ± 10%

-650

µA

Input Leakage Current (Port 0, EA)0.45 < V

IN < VCC

±10

µA

RRST

Reset Pulldown Resistor

Ω

CIO

Pin Capacitance

Test Freq. = 1 MHz, TA = 25°C

Power Supply Current

Active Mode, 12 MHz

Idle Mode, 12 MHz

6.5

Power-down Mode

(1)

VCC = 5.5V

100

µA

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