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TC7MBL3245SFT Fiches technique(PDF) 6 Page - Toshiba Semiconductor

No de pièce TC7MBL3245SFT
Description  Low Voltage/Low Capacitance Octal Bus Switch
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TC7MBL3245SFT Fiches technique(HTML) 6 Page - Toshiba Semiconductor

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TC7MBL3245SFT/FK/FTG
2009-01-20
6
Rise and Fall Times (tr / tf) of the TC7MBL3245S 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 TC7MBL3245S.
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) = - ( 12+ 15 )E-12 ・ ( 120 + 9) ・ ln ( ( ( 3.0 - 0 ) – 1.5 ) / ( 3.0 – 0 ) )
≈ 2.4ns
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
Parameter
3.3 ± 0.3 V
2.5 ± 0.2 V
1.8 ± 0.15 V
VM
VCC / 2
VCC / 2
VCC / 2
Figure 3 Test Circuit
Measure
An/Bn
CI/O
(Switch On)
TC7MBL3245S
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 TC7MBL3245S
tf out
Waveform generated with the TC7MBL3245S added


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