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SN74TVC16222ADGGR データシート(PDF) 6 Page - Texas Instruments

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部品番号 SN74TVC16222ADGGR
部品情報  22-BIT VOLTAGE CLAMP
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SN74TVC16222A
22BIT VOLTAGE CLAMP
SCDS087G − APRIL 1999 − REVISED APRIL 2005
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
TVC voltage-limiting application
For the voltage-limiting configuration, the common GATE input must be connected to one side (A or B) of any
one of the transistors (see Figure 3). This connection determines the VBIAS input of the reference transistor. The
VBIAS input is connected through a pullup resistor (typically 200 kΩ ) to the VDD supply. A filter capacitor on VBIAS
is recommended. The opposite side of the reference transistor is used as the reference voltage (VREF)
connection. The VREF input must be less than VDDREF − 1 V to bias the reference transistor into conduction.
The reference transistor regulates the gate voltage (VGATE) of all the pass transistors. VGATE is determined by
the characteristic gate-to-source voltage difference (VGS) because VGATE = VREF + VGS. The low-voltage side
of the pass transistors has a high-level voltage limited to a maximum of VGATE − VGS, or VREF.
200 k
VDDREF = 3.3 V
150
150
150
150
Open-Drain
CPU Interface
Motherboard
Interface
3
A2
4
A3
5
A4
24
A23
1
VDPU
TVC16222A
GATE†
48
B1 (VBIAS)†
47
2
A1 (VREF)†
† VREF and VBIAS can be applied to any one of the pass transistors. GATE must be connected externally to VBIAS.
B2
46
B3
45
B4
44
B23
25
Figure 3. Typical Application Circuit


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