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TC7MBL3126CFK датащи(PDF) 8 Page - Toshiba Semiconductor

номер детали TC7MBL3126CFK
подробное описание детали  Low Voltage/Low Capacitance Quad Bus Switch
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производитель  TOSHIBA [Toshiba Semiconductor]
домашняя страница  http://www.semicon.toshiba.co.jp/eng
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TC7MBL3126CFK датащи(HTML) 8 Page - Toshiba Semiconductor

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TC7MBL3125C,3126CFT/FK/FTG
2008-10-01
8
Rise and Fall Times (tr / tf) of the TC7MBL3125C, 3126C 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 TC7MBL3125C, 3126C.
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
Symbol
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
RDRIVE
Previous IC
RDRIVE = output impedance of the previous IC
VCC
GND
Waveform generated without the TC7MBL3125C,3126C
Measure
An/Bn
CI/O
(Switch On)
TC7MBL3125C
TC7MBL3126C
RDRIVE
Previous IC
Bn/An
RDRIVE = output impedance of the previous IC
RON
VOL
VOH
VM
tr(out)
VM
tf(out)
Waveform generated with the TC7MBL3125C,3126C added


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