AT89C51RC2-3CSIM datasheet(108/127 Pages) ATMEL

108 / 127 page

108

AT89C51RB2/RC2

4180C–8051–12/03

Notes:

1. Operating I

CC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 49.), 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

46).

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 = V

CC; EA = RST = VSS (see Figure 47).

3. Power Down I

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

ure 48).

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 100pF), 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 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:

Port 0: 26 mA

Ports 1, 2 and 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.

7. For other values, please contact your sales office.

8. Icc Flash Write operation current while an on-chip flash page write is on going.

9. Flash Retention is guaranteed with the same formula for V

CC Min down to 0.

OH1

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 Pulldown 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 for P0 only

±10

µA

0.45V < VIN < VCC

ITL

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

-650

µAV

IN = 2.0V

CIO

Capacitance of I/O Buffer

Fc = 3 MHz

TA = 25

°C

IPD

Power Down Current

100

150

µA4.5V < V

CC < 5.5V

(3)

ICCOP

Power Supply Current on normal mode

0.4 x Frequency (MHz) + 5

VCC = 5.5V

(1)

ICCIDLE

Power Supply Current on idle mode

0.3 x Frequency (MHz) + 5

VCC = 5.5V

(1)

CCProg

Power Supply Current during flash Write / Erase

0.4 x

Frequency

(MHz) + 20

CC = 5.5V

(8)

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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