AT89C51ED2-RDTUM datasheet(115/137 Pages) ATMEL

115 / 137 page

115

4235K–8051–05/08

AT89C51RD2/ED2

Notes:

1. Operating ICC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 25-4), VIL =

VSS + 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 25-1).

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 25-2).

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

ure 25-3).

4. Capacitance loading on Ports 0 and 2 may cause spurious noise pulses to be superimposed on the VOLS 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, IOL must be externally limited as follows:

Maximum IOL per port pin: 10 mA

Maximum IOL per 8-bit port:

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

kΩ

IIL

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

-50

VIN = 0.45V

ILI

Input Leakage Current

0.45V < VIN < VCC

ITL

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

-650

VIN = 2.0V

Capacitance of I/O Buffer

FC = 3 MHz

A = 25°C

Power-down Current

150

2.7 < 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

VPFDP

Internal POR/PFD VPFDP threshold

2.25

2.5

2.69

VPFDM

Internal POR/PFD VPFDM threshold

2.15

2.35

2.62

Vhyst

Internal POR/PFD Hysteresys

140

250

Vcc

dV/dt

Maximum Vcc Power supply slew rate(7)

0.1

V/µs

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

AT89C51ED2-RDTUM Datasheet(PDF) 115 Page - ATMEL Corporation

AT89C51ED2-RDTUM Datasheet(HTML) 115 Page - ATMEL Corporation

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