AT89C51ED2-RDTIM datasheet(117/137 Pages) ATMEL

117 / 137 page

117

AT89C51RD2/ED2

4235E–8051–04/04

Notes:

1. Operating I

CC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 55), VIL =

SS + 0.5V, VIH = VCC - 0.5V; XTAL2 N.C.; EA = RST = Port 0 = VCC. ICC would be slightly higher if a crystal oscillator used

(see Figure 52).

2. Idle ICC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns, VIL = VSS + 0.5V, VIH = VCC -

0.5V; XTAL2 N.C; Port 0 = VCC; EA = RST = VSS (see Figure 53).

3. Power-down ICC is measured with all output pins disconnected; EA = VSS, PORT 0 = VCC; XTAL2 NC.; RST = VSS (see Fig-

ure 54).

4. Capacitance loading on Ports 0 and 2 may cause spurious noise pulses to be superimposed on the V

OLS of ALE and Ports 1

and 3. The noise is due to external bus capacitance discharging into the Port 0 and Port 2 pins when these pins make 1 to 0

transitions during bus operation. In the worst cases (capacitive loading 100 pF), the noise pulse on the ALE line may exceed

0.45V with maxi VOL peak 0.6V. A Schmitt Trigger use is not necessary.

5. Typical values are based on a limited number of samples and are not guaranteed. The values listed are at room temperature

and 5V.

6. Under steady state (non-transient) conditions, I

OL must be externally limited as follows:

Maximum I

OL per port pin: 10 mA

Maximum IOL per 8-bit port:

Port 0: 26 mA

Ports 1, 2 and 3: 15 mA

Maximum total IOL for all output pins: 71 mA

If I

OL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater

than the listed test conditions.

VOH1

Output High Voltage, port 0, ALE, PSEN

VCC - 0.3

VCC - 0.7

VCC - 1.5

VCC = 5V ± 10%

IOH = -200 µA

IOH = -3.2 mA

IOH = -7.0 mA

0.9 VCC

VCC = 2.7V to 5.5V

IOH = -10 µA

RRST

RST Pull-down Resistor

200

(5)

250

Ω

IIL

Logical 0 Input Current ports 1, 2, 3, 4 and 5

-50

µAV

IN = 0.45V

ILI

Input Leakage Current

±10

µA

0.45V < VIN < VCC

ITL

Logical 1 to 0 Transition Current, ports 1, 2, 3, 4

-650

µAV

IN = 2.0V

Capacitance of I/O Buffer

FC = 3 MHz

A = 25°C

Power-down Current

150

µA2.7 < V

CC < 5.5V

(3)

CCOP

Power Supply Current on normal mode

0.4 x Frequency (MHz) + 5

CC = 5.5V

(1)

CCIDLE

Power Supply Current on idle mode

0.3 x Frequency (MHz) + 5

CC = 5.5V

(2)

CCWRITE

Power Supply Current on flash or EEdata write

0.8 x Frequency (MHz) + 15

CC = 5.5V

WRITE

Flash or EEdata programming time

2.7 < V

CC < 5.5V

TA = -40°C to +85°C; VSS = 0V;

VCC =2.7V to 5.5V and F = 0 to 40 MHz (both internal and external code execution)

VCC =4.5V to 5.5V and F = 0 to 60 MHz (internal code execution only) (Continued)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

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