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T80C251TB

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Table 9. DC Characteristics at VCC = 4.5 – 5.5 V (Sheet 2 of 2)

Symbol

Parameter

Min

Typical

Max

Units Test Conditions

VOH1

Output High Voltage

(Port 0 in External

Address)

VCC – 0.3

VCC – 0.7

VCC – 1.5

V IOH = -200 µA

IOH = -3.2 mA

IOH = -7.0 mA

VOH2

Output High Voltage

(Port 2 in External

Address during Page

Mode)

VCC – 0.3

VCC – 0.7

VCC – 1.5

V IOH = -200 µA

IOH = -3.2 mA

IOH = -7.0 mA

IIL

Logical 0 Input

Current (Port 1, 2, 3)

-50

µA VIN = 0.45 V

ILI

Input Leakage

Current (Port 0)

+/-10

µA 0.45 < VIN < VCC

ITL

Logical 1-to-0

Transition Current

(Port 1, 2, 3)

-650

µA VIN = 2.0 V

RRST

RST Pulldown

40

Resistor

225

kΩ

CIO

Pin Capacitance

IPD

Powerdown Current

10

(Note 4)

10

20

(Note 4)

pF FOSC = 24 MHz

TA = 25 °C

µA

IDL

Idle Mode Current

35

44

(Note 4)

mA FOSC = 24 MHz

ICC

Operating Current

70

83

(Note 4)

mA FOSC = 24 MHz

NOTES:

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 1–3

15 mA

• Maximum Total IOL for

all output pins

71 mA

If IOL exceeds the test conditions, VOL 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 VOH on ALE and PSEN# to drop below the specification when the address

lines are stabilizing.

Typical values are obtained using VCC = 5.0, TA = 25°C and are not guaranteed.

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