TC7MBL6125S,6126SFT/FK/FTG

2008-08-05

7

Rise and Fall Times (tr / tf) of the TC7MBL6125S, 6126S I/O Signals

The tr(out) and tf(out) values of the output signals are affected by the CR time constant of the input, which consists of

In practice, the tr(out) and tf(out) values are also affected by the circuit’s capacitance and resistance components other

than those of the TC7MBL6125S, 6126S.

The tr (out) / tf(out) values can be approximated as follows. (Figure 3 shows the test circuit.)

Calculation example:

tr(out) (approx) = - ( 12 + 15 )E-12 ･ ( 120 + 9) ･ ln ( ( ( 3.0 - 0 ) – 1.5 ) / ( 3.0 – 0 ) )

≈ 2.4 ns

Calculation conditions:

Parameter

3.3 ± 0.3 V

2.5 ± 0.2 V

1.8 ± 0.15 V

Figure 3

Test Circuit

Measure

An/Bn

(Switch On)

TC7MBL6125S

TC7MBL6126S

Previous IC

Bn/An

tr(out)

Measure

Previous IC

GND

Waveform generated without the TC7MBL6125S, 6126S

tf(out)

Waveform generated with the TC7MBL6125S,6126S added