COP226C datasheet(16/24 Pages) NSC

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Power Dissipation (Continued)

If an IT instruction is executed the chip goes into the IDLE

mode until the timer overflows In IDLE mode the current

drain can be calculated from the following equation

IcieIQaVc70cFi

For example at 5 volts VCC and 400 kHz

Icie120a5c70c04e260 mA

The total average current will then be the weighted average

of the operating current and the idle current

Ita e ICO c

ToaTi

Ici c

ToaTi

where

Itaetotal average current

ICOeoperating current

Icieidle current

Toeoperating time

Tieidle time

IO OPTIONS

Outputs have the following optional configurations illustrat-

ed in

Figure 8

a Standard

A CMOS push-pull buffer with an N-channel

device to ground in conjunction with a P-channel device

to VCC compatible with CMOS and LSTTL

b Open Drain

An N-channel device to ground only al-

lowing external pull-up as required by the user’s applica-

tion

c Standard TRI-STATE L Output

A CMOS output buffer

similar to a which may be disabled by program control

d Open-Drain TRI-STATE L Output

This has the N-chan-

nel device to ground only

All inputs have the following option

e Hi-Z input which must be driven by the users logic

All output drivers use two common devices numbered 1 to

2 Minimum and maximum current (IOUT and VOUT) curves

are given in

Figure 9 for each of these devices to allow the

designer to effectively use these IO configurations

a Standard Push-Pull Output

b Open-Drain Output

TLDD8422 – 11

c Standard TRI-STATE ‘‘L’’ Output

d Open Drain TRI-STATE

‘‘L’’ Output

e Hi-Z Input

FIGURE 8 InputOutput Configurations

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