Datasheet

130
AT89C51IC2
4301D–8051–02/08
DC Parameters for Low
Voltage
TA = 0°C to +70°C; V
SS
= 0V; V
CC
= 2.7V to 3.6V; F = 0to 48 MHz
TA = -40°C to +85°C; V
SS
= 0V; V
CC
= 2.7V to 3.6V; F = 0 to 48 MHz
Notes: 1. Operating I
CC
is measured with all output pins disconnected; XTAL1 driven with T
CLCH
, T
CHCL
= 5 ns (see Figure 56.), V
IL
=
V
SS
+ 0.5V,
V
IH
= V
CC
- 0.5V; XTAL2 N.C.; EA = RST = Port 0 = V
CC
. I
CC
would be slightly higher if a crystal oscillator used (see Figure
53).
2. Idle I
CC
is measured with all output pins disconnected; XTAL1 driven with T
CLCH
, T
CHCL
= 5 ns, V
IL
= V
SS
+ 0.5V, V
IH
= V
CC
-
0.5V; XTAL2 N.C; Port 0 = V
CC
; EA = RST = V
SS
(see Figure 54).
3. Power Down I
CC
is measured with all output pins disconnected; EA = V
SS
, PORT 0 = V
CC
; XTAL2 NC.; RST = V
SS
(see Fig-
ure 55).
4. Capacitance loading on Ports 0 and 2 may cause spurious noise pulses to be superimposed on the V
OL
s 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, I
OL
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
Symbol Parameter Min Typ Max Unit Test Conditions
V
IL
Input Low Voltage -0.5 0.2 V
CC
- 0.1 V
V
IH
Input High Voltage except RST, XTAL1 0.2 V
CC
+ 0.9 V
CC
+ 0.5 V
V
IH1
Input High Voltage, RST, XTAL1 0.7 V
CC
V
CC
+ 0.5 V
V
OL
Output Low Voltage, ports 1, 2, 3, 4
(6)
0.45 V I
OL
= 0.8 mA
(4)
V
OL1
Output Low Voltage, port 0, ALE, PSEN
(6)
0.45 V I
OL
= 1.6 mA
(4)
V
OH
Output High Voltage, ports 1, 2, 3, 4 0.9 V
CC
V I
OH
= -10 µ A
V
OH1
Output High Voltage, port 0, ALE, PSEN 0.9 V
CC
V I
OH
= -40 µ A
I
IL
Logical 0 Input Current ports 1, 2, 3, 4 -50 µ A V
IN
= 0.45 V
I
LI
Input Leakage Current for P0 only ± 10 µ A 0.45V < V
IN
< V
CC
I
TL
Logical 1 to 0 Transition Current, ports 1, 2, 3, -650 µ A V
IN
= 2.0V
R
RST
RST Pulldown Resistor 50 200
(5)
250 k Ω
C
IO
Capacitance of I/O Buffer 10 pF
Fc = 3 MHz
T A = 25 ° C
I
PD
Power Down Current 10
(5)
50 µ A
V
CC
= 2.7V to
3.6V
(3)
I
CCOP
Power Supply Current on normal mode 0.4 x Frequency (MHz) + 5 mA V
CC
= 3.6 V
(1)
I
CCIDLE
Power Supply Current on idle mode 0.3 x Frequency (MHz) + 5 mA V
CC
= 3.6 V
(2)
I
CCProg
Power Supply Current during flash Write / Erase
0.4 x
Frequency
(MHz) +
20
mA V
CC
= 5.5V
(8)