22
3053C–MICRO–6/08
AT89LS51
Notes:
1. Under steady state (non-transient) conditions, I
OL must be externally limited as follows:
Maximum I
OL 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 V
CC for Power-down is 2V.
22. DC Characteristics
The values shown in this table are valid for T
A = -40°C to 85°C and VCC = 2.7V to 4.0V, unless otherwise noted.
Symbol
Parameter
Condition
Min
Max
Units
VIL
Input Low Voltage
(Except EA)-0.5
0.7
V
IL1
Input Low Voltage (EA)
-0.5
0.2 V
CC-0.3
V
VIH
Input High Voltage
(Except XTAL1, RST)
0.2 VCC+0.9
VCC+0.5
V
VIH1
Input High Voltage
(XTAL1, RST)
0.7 VCC
VCC+0.5
V
VOL
Output Low Voltag
e(1) (Ports
1,2,3)
IOL = 0.8 mA
0.45
V
VOL1
(Port 0, ALE, PSEN)
IOL = 1.6 mA
0.45
V
VOH
Output High Voltage
(Ports 1,2,3, ALE, PSEN)
IOH = -60 A
2.4
V
IOH = -25 A
0.65 VCC
V
I
OH = -10 A
0.80 V
CC
V
VOH1
Output High Voltage
(Port 0 in External Bus Mode)
IOH = -800 A
2.4
V
IOH = -300 A
0.75 VCC
V
I
OH = -80 A
0.9 V
CC
V
I
IL
Logical 0 Input Current (Ports
1,2,3)
V
IN = 0.45V
-50
A
ITL
Logical 1 to 0 Transition Current
(Ports 1,2,3)
VIN = 2V
-150
A
ILI
Input Leakage Current (Port 0,
EA)
0.45 < VIN < VCC
±10
A
RRST
Reset Pulldown Resistor
50
300
K
Ω
C
IO
Pin Capacitance
Test Freq. = 1 MHz, T
A = 25°C
10
pF
ICC
Power Supply Current
Active Mode, 12 MHz
25
mA
Idle Mode, 12 MHz
6.5
mA
V
CC = 4.0V
30
A