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TC7MBL3245CFT 数据表(PDF) 8 Page - Toshiba Semiconductor

部件名 TC7MBL3245CFT
功能描述  Low Voltage/Low Capacitance Octal Bus Switch
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制造商  TOSHIBA [Toshiba Semiconductor]
网页  http://www.semicon.toshiba.co.jp/eng
标志 TOSHIBA - Toshiba Semiconductor

TC7MBL3245CFT 数据表(HTML) 8 Page - Toshiba Semiconductor

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TC7MBL3245CFT/FK/FTG
2008-09-01
8
Rise and Fall Times (tr / tf) of the TC7MBL3245C 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 TC7MBL3245C.
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) = - ( 7.5 + 15 )E-12 ・ ( 120 + 6.5) ・ ln ( ( ( 3.0 - 0 ) – 1.5 ) / ( 3.0 – 0 ) )
≈ 2.0 ns
Calculation conditions:
VCC = 3.0V , CL = 15pF , RDRIVE = 120Ω(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
VCC / 2
VCC / 2
Figure 3
Test Circuit
Measure
An/Bn
CI/O
(Switch On)
TC7MBL3245C
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 TC7MBL3245C
tf(out)
Waveform generated with the TC7MBL3245C added


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