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參數(shù)資料
| 型號(hào)： | TC7MBL6353SFTG |
| 廠商： | Toshiba Corporation |
| 英文描述： | Low Voltage/Low Capacitance Dual 1-of-2 Multiplexer/Demultiplexer |
| 中文描述： | 低電壓/低電容雙1 - 2復(fù)用器/解復(fù)用器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 313K |
| 代理商： | TC7MBL6353SFTG |
TC7MBL6353SFT/FK/FTG
2007-10-19
7
Rise and Fall Times (tr / tf) of the TC7MBL6353S 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 (C
I/O
) and the on-resistance (R
ON
) 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 TC7MBL6353S.
The tr / tf (out) values can be approximated as follows. (Figure 4 shows the test circuit.)
tr / tf out (approx) = - ( C
I/O
+ C
L
)
(R
DRIVE+
R
ON
)
ln ( ( ( V
OH
– V
OL
) – V
M
) / ( V
OH
– V
OL
) )
where, R
DRIVE
is the output impedance of the previous-stage circuit.
Calculation example:
tr out (approx) = - ( 15
+ 15
)E-12
( 120 + 9)
ln ( ( ( 3.0 - 0
) – 1.5 ) / ( 3.0 – 0
) )
≈
2.7 ns
Calculation conditions:
V
CC
= 3.0V , C
L
= 15pF , R
DRIVE
= 120
(output impedance of the previous IC), V
M
= 1.5V (V
CC
/ 2)
Output of the previous IC = digital (i.e., high-level voltage = V
CC
; low-level voltage = GND)
V
CC
Parameter
3.3 ± 0.3 V
2.5 ± 0.2 V
1.8 ± 0.15 V
V
M
V
CC
/ 2
V
CC
/ 2
V
CC
/ 2
Figure 4 Test Circuit
Measure
C
L
An/Bn
C
I/O
(Switch On)
TC7MBL6353S
R
DRIVE
Previous IC
Bn/An
R
DRIVE
= output impedance of the previous IC
=
R
ON
V
OL
V
OH
V
M
tr out
V
M
Measure
C
L
R
DRIVE
Previous IC
R
DRIVE
= output impedance of the previous IC
V
CC
GND
Waveform generated without the TC7MBL6353S
tf out
Waveform generated with the TC7MBL6353S added
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