TC7MBL3253CFK datasheet(8/12 Pages) TOSHIBA

No. de pieza	TC7MBL3253CFK

Descripción Electrónicos	CMOS Digital Integrated Circuit Silicon Monolithic

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Fabricante Electrónico	TOSHIBA [Toshiba Semiconductor]

Página de inicio	http://www.semicon.toshiba.co.jp/eng

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TC7MBL3253CFT/FK/FTG

2009-02-02

8

Rise and Fall Time (tr / tf) of the TC7MBL3253C 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

the switch terminal capacitance (CI/O) and the on-resistance (RON) of the input.

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 TC7MBL3253C.

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

tr(out) / tf(out) (approx) = - ( CI/O + CL ) ･ (RDRIVE+ RON) ･ ln ( ( ( VOH – VOL ) – VM) / ( VOH – VOL ) )

where, RDRIVE is the output impedance of the previous-stage circuit.

Calculation example:

tr(out) (approx) = - ( 13 + 15 )E-12 ･ ( 120 + 9) ･ ln ( ( ( 3.0 - 0 ) – 1.5 ) / ( 3.0 – 0 ) )

≈ 2.5 ns

Calculation conditions:

VCC = 3.0V, CL = 15pF , RDRIVE = 120 Ω (output impedance of the previous IC), VM = 1.5V (VCC / 2)

Output of the previous IC = digital (i.e., high-level voltage = VCC; low-level voltage = GND)

VCC

項目

3.3 ± 0.3 V

2.5 ± 0.2 V

1.8 ± 0.15 V

VM

VCC / 2

Figure 3 Test Circuit

Measure

An/Bn

CI/O

(Switch On)

TC7MBL3253C

RDRIVE

Previous IC

Bn/An

RDRIVE = output impedance of the previous IC

RON

VOL

VOH

VM

tr(out)

VM

Measure

RDRIVE

Previous IC

RDRIVE = output impedance of the previous IC

VCC

GND

Waveform generated without the TC7MBL3253C

tf(out)

Waveform generated with the TC7MBL3253C added

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TC7MBL3253CFK Datasheet(PDF) 8 Page - Toshiba Semiconductor

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