Datasheet AT89C51 (Microchip) - 10

Absolute Maximum Ratings*
Operating Temperature.. -55°C to +125°C *NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent dam- Storage Temperature ... -65°C to +150°C age to the device. This is a stress rating only and functional operation of the device at these or any Voltage on Any Pin other conditions beyond those indicated in the with Respect to Ground ...-1.0V to +7.0V operational sections of this specification is not implied. Exposure to absolute maximum rating Maximum Operating Voltage .. 6.6V conditions for extended periods may affect device reliability. DC Output Current.. 15.0 mA
DC Characteristics
TA = -40°C to 85°C, VCC = 5.0V ± 20% (unless otherwise noted)
Symbol Parameter Condition Min Max Units
VIL Input Low-voltage (Except EA) -0.5 0.2 VCC - 0.1 V V Input Low-voltage (EA) -0.5 0.2 V - 0.3 V IL1 CC V Input High-voltage (Except XTAL1, RST) 0.2 V + 0.9 V + 0.5 V IH CC CC VIH1 Input High-voltage (XTAL1, RST) 0.7 VCC VCC + 0.5 V V Output Low-voltage(1) (Ports 1,2,3) I = 1.6 mA 0.45 V OL OL Output Low-voltage(1) V I = 3.2 mA 0.45 V OL1 (Port 0, ALE, PSEN) OL I = -60 µA, V = 5V ± 10% 2.4 V OH CC Output High-voltage V I = -25 µA 0.75 V V OH (Ports 1,2,3, ALE, PSEN) OH CC IOH = -10 µA 0.9 VCC V I = -800 µA, V = 5V ± 10% 2.4 V OH CC Output High-voltage V I = -300 µA 0.75 V V OH1 (Port 0 in External Bus Mode) OH CC IOH = -80 µA 0.9 VCC V I Logical 0 Input Current (Ports 1,2,3) V = 0.45V -50 µA IL IN Logical 1 to 0 Transition Current I V = 2V, VCC = 5V ± 10% -650 µA TL (Ports 1,2,3) IN I Input Leakage Current (Port 0, EA) 0.45 < V < V ±10 µA LI IN CC RRST Reset Pull-down Resistor 50 300 KΩ CIO Pin Capacitance Test Freq. = 1 MHz, TA = 25°C 10 pF Active Mode, 12 MHz 20 mA Power Supply Current Idle Mode, 12 MHz 5 mA ICC V = 6V 100 µA CC Power-down Mode(2) V = 3V 40 µA CC Notes: 1. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum I per port pin: 10 mA OL Maximum I per 8-bit port: Port 0: 26 mA OL Ports 1, 2, 3: 15 mA Maximum total I for all output pins: 71 mA OL If I exceeds the test condition, V may exceed the related specification. Pins are not guaranteed to sink current greater OL OL than the listed test conditions. 2. Minimum V for Power-down is 2V. CC
10 AT89C51
Document Outline Block Diagram Features Description Pin Description VCC GND Port 0 Port 1 Port 2 Port 3 RST ALE/PROG PSEN EA/VPP XTAL1 XTAL2 Oscillator Characteristics Status of External Pins During Idle and Power-down Modes Lock Bit Protection Modes Programming the Flash Programming Interface Flash Programming Modes Flash Programming and Verification Waveforms - High-voltage Mode (VPP = 12V) Flash Programming and Verification Waveforms - Low-voltage Mode (VPP = 5V) Flash Programming and Verification Characteristics Absolute Maximum Ratings* DC Characteristics AC Characteristics External Program and Data Memory Characteristics External Program Memory Read Cycle External Data Memory Read Cycle External Data Memory Write Cycle External Clock Drive Waveforms External Clock Drive Serial Port Timing: Shift Register Mode Test Conditions Shift Register Mode Timing Waveforms AC Testing Input/Output Waveforms(1) Float Waveforms(1) Ordering Information