EN80C186EA13 데이터 시트보기 (PDF) - Intel

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EN80C186EA13

16-Bit High-Integration Embedded Processors

Intel 

DC Specifications

8.1

Table 11.

ICC Versus Frequency and Voltage

The current (ICC) consumption of the processor is essentially composed of two components; IPD

and ICCS.

IPD is the quiescent current that represents internal device leakage, and is measured with all inputs

or floating outputs at GND or VCC (no clock applied to the device). IPD is equal to the Powerdown

current and is typically less than 50 µA.

ICCS is the switching current used to charge and discharge parasitic device capacitance when

changing logic levels. Since ICCS is typically much greater than IPD, IPD can often be ignored when

calculating ICC.

ICCS is related to the voltage and frequency at which the device is operating. It is given by the

formula:

Where:

Power = V × I = V2 × CDEV × f

∴ I = ICC = ICCS = V × CDEV × f

V = Device operating voltage (VCC)

CDEV = Device capacitance

f = Device operating frequency

ICCS = ICC = Device current

Measuring CDEV on a device like the 80C186EA would be difficult. Instead, CDEV is calculated

using the above formula by measuring ICC at a known VCC and frequency (see Table 11). Using

this CDEV value, ICC can be calculated at any voltage and frequency within the specified operating

range.

EXAMPLE: Calculate the typical ICC when operating at 20 MHz, 4.8V.

ICC = ICCS = 4.8 × 0.515 × 20 ≈ 49 mA

CDEV Values

Parameter

Type

Max

Units

Notes

CDEV (Device in Reset)

0.515

0.905

mA/V*MHz

1,2

CDEV (Device in Idle)

0.391

0.635

mA/V*MHz

1,2

1. Max CDEV is calculated at -40 °C, all floating outputs driven to VCC or GND, and all outputs loaded to 50 pF

(including CLKOUT and OSCOUT).

2. Typical CDEV is calculated at 25°C with all outputs loaded to 50 pF except CLKOUT and OSCOUT, which

are not loaded.

28

Product Name Datasheet

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