23. DC Characteristics
The values shown in this table are valid for TA = -40°C to 85°C and VCC = 4.0V to 5.5V, unless otherwise noted.
Symbol Parameter
Condition
Min
Max
Units
VIL
VIL1
VIH
VIH1
VOL
VOL1
Input Low Voltage
Input Low Voltage (EA)
Input High Voltage
Input High Voltage
Output Low Voltage(1) (Ports 1,2,3)
Output Low Voltage(1)
(Port 0, ALE, PSEN)
(Except EA)
(Except XTAL1, RST)
(XTAL1, RST)
IOL = 1.6 mA
IOL = 3.2 mA
-0.5
0.2 VCC-0.1
V
-0.5
0.2 VCC-0.3
V
0.2 VCC+0.9
VCC+0.5
V
0.7 VCC
VCC+0.5
V
0.45
V
0.45
V
VOH
VOH1
IIL
ITL
Output High Voltage
(Ports 1,2,3, ALE, PSEN)
Output High Voltage
(Port 0 in External Bus Mode)
Logical 0 Input Current (Ports 1,2,3)
Logical 1 to 0 Transition Current
(Ports 1,2,3)
IOH = -60 µA, VCC = 5V ± 10%
IOH = -25 µA
IOH = -10 µA
IOH = -800 µA, VCC = 5V ± 10%
IOH = -300 µA
IOH = -80 µA
VIN = 0.45V
VIN = 2V, VCC = 5V ± 10%
2.4
V
0.75 VCC
V
0.9 VCC
V
2.4
V
0.75 VCC
V
0.9 VCC
V
-50
µA
-300
µA
ILI
RRST
Input Leakage Current (Port 0, EA)
Reset Pulldown Resistor
0.45 < VIN < VCC
±10
µA
50
300
KΩ
CIO
ICC
Notes:
Pin Capacitance
Test Freq. = 1 MHz, TA = 25°C
10
pF
Power Supply Current
Active Mode, 12 MHz
Idle Mode, 12 MHz
25
mA
6.5
mA
Power-down Mode(2)
VCC = 5.5V
50
µA
1. 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, 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.
2. Minimum VCC for Power-down is 2V.
22 AT89S51
2487D–MICRO–6/08