80C251SB16 Datasheet, PDF (17/36 Pages) Intel Corporation – HIGH-PERFORMANCE CHMOS MICROCONTROLLER

8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Symbol
Table 9. DC Characteristics at V_CC = 4.5 – 5.5 V (Continued)
Parameter
Min
Typical
Max
Units Test Conditions
V_OH1
V_OH2
Output High Voltage
(Port 0 in External
Address)
Output High Voltage
(Port 2 in External
Address during Page
Mode)
V_CC – 0.3
V_CC – 0.7
V_CC – 1.5
V_CC – 0.3
V_CC – 0.7
V_CC – 1.5
V
I_OH = -200 µA
I_OH = -3.2 mA
I_OH = -7.0 mA
V
I_OH = -200 µA
I_OH = -3.2 mA
I_OH = -7.0 mA
I_IL
Logical 0 Input Cur-
rent (Port 1, 2, 3)
-50
µA VIN = 0.45 V
I_LI
Input Leakage Cur-
rent (Port 0)
+/-10
µA 0.45 < VIN < V_CC
I_TL
Logical 1-to-0 Transi-
tion Current (Port 1,
2, 3)
-650
µA VIN = 2.0 V
R_RST
RST Pulldown Resis-
40
tor
225
kΩ
C_IO
Pin Capacitance
I_PD
Powerdown Current
10
(Note 4)
10
20
(Note 4)
pF F_OSC = 16 MHz
T_A = 25 °C
µA
I_DL
Idle Mode Current
12
15
(Note 4)
mA F_OSC = 16 MHz
I_CC
Operating Current
45
80
(Note 4)
mA F_OSC = 16 MHz
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 I_OL per 8-bit port:
port 0
26 mA
ports 1–3
15 mA
Maximum Total I_OL for
all output pins
71 mA
If I_OL exceeds the test conditions, V_OL may exceed the related specification. Pins are not guaranteed
to sink current greater than the listed test conditions.
2. Capacitive loading on ports 0 and 2 may cause spurious noise pulses above 0.4 V on the low-level
outputs of ALE and ports 1, 2, and 3. The noise is due to external bus capacitance discharging into
the port 0 and port 2 pins when these pins change from high to low. In applications where capacitive
loading exceeds 100 pF, the noise pulses on these signals may exceed 0.8 V. It may be desirable to
qualify ALE or other signals with a Schmitt trigger or CMOS-level input logic.
3. Capacitive loading on ports 0 and 2 causes the V_OH on ALE and PSEN# to drop below the specifica-
tion when the address lines are stabilizing.
4. Typical values are obtained using V_CC = 5.0, T_A = 25°C and are not guaranteed.
PRELIMINARY
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