AT89C51ID2-RDTIM datasheet(141/159 Pages) ATMEL

141 / 159 page

141

AT89C51ID2

4289A–8051–09/03

Notes:

1. Operating I

CC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 60), 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 57).

2. Idle I

CC 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 = V

CC; EA = RST = VSS (see Figure 58).

3. Power-down I

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

ure 59).

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 V

OL 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 I

OL per port pin: 10 mA

Maximum I

OL per 8-bit port:

Port 0: 26 mA

Ports 1, 2 and 3: 15 mA

Maximum total I

OL 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.

Figure 57. ICC Test Condition, Active Mode

RST

RST Pull-down Resistor

200

(5)

250

Ω

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

-50

µAV

IN = 0.45V

Input Leakage Current

±10

µA

0.45V < V

IN < VCC

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

-650

µAV

IN = 2.0V

CIO

Capacitance of I/O Buffer

C = 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

A = -40°C to +85°C; VSS = 0V; VCC =2.7V to 5.5V; F = 0 to 60 MHz (Continued)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

ICC

(NC)

CLOCK

SIGNAL

VCC

All other pins are disconnected.

RST

XTAL2

XTAL1

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