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FST34X2245QSP 데이터시트 PDF




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부품번호 FST34X2245QSP 기능
기능 32-Bit Bus Switch with 25 Series Resistors in Outputs
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FST34X2245QSP 데이터시트, 핀배열, 회로
December 2001
Revised January 2005
FST34X2245
32-Bit Bus Switch with 25: Series Resistors in Outputs
General Description
The Fairchild Switch FST34X2245 provides 32-bits of high
speed CMOS TTL-compatible bus switching in a standard
flow-through mode. The low On Resistance of the switch
allows inputs to be connected to outputs without adding
propagation delay or generating additional ground bounce
noise.
The device is organized as a 32-bit switch. When OE is
LOW, the switch is ON and Port A is connected to Port B.
When OE is HIGH, the switch is OPEN and a high-imped-
ance state exists between the two ports.
:The FST34X2245 has equivalent 25 series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Features
:25 switch connection between two ports
Minimal propagation delay through the switch
Low lCC
Zero bounce in flow-through mode
Control inputs compatible with TTL level
32-bit version of FST32245
Packaged in 20.5mm 80-lead package
Ordering Code:
Order Number
Package
Number
Package Description
FST34X2245QSPX
MQA80A 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide
FST34X2245QSPX_NL MQA80A Pb-Free 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide
(Note 1)
Note 1: “_NL” indicates Pb-Free product (per JEDEC J-STD-020B). Device is available in Tape and Reel only.
Logic Diagram
© 2005 Fairchild Semiconductor Corporation DS500594
www.fairchildsemi.com




FST34X2245QSP pdf, 반도체, 판매, 대치품
AC Electrical Characteristics
Symbol
Parameter
TA 40 qC to 85 qC,
CL 50pF, RU RD 500:
VCC 4.5 – 5.5V
VCC 4.0V
Units
Conditions
Figure
Number
Min Max Min Max
tPHL, tPLH
Propagation Delay Bus to Bus
(Note 9)
1.25 1.25 ns VI OPEN
Figures
1, 2
tPZH, tPZL
Output Enable Time
1.0 5.9
6.4 ns VI 7V for tPZL
VI OPEN for tPZH
Figures
1, 2
tPHZ, tPLZ
Output Disable Time
1.0 6.0
5.7 ns VI 7V for tPLZ
VI OPEN for tPHZ
Figures
1, 2
Note 9: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On
Resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage the source (zero output impedance).
Capacitance (Note 10)
Symbol
Parameter
Typ
CIN Control Pin Input Capacitance
3
CI/O Input/Output Capacitance
5
Note 10: TA 25qC, f 1 MHz, Capacitance is characterized but not tested.
Max
Units
pF
pF
Conditions
VCC 5.0V
VCC, OE 5.0V
AC Loading and Waveforms
Note: Input driven by 50 : source terminated in 50 :
Note: CL includes load and stray capacitance
Note: Input PRR 1.0 MHz tW 500 ns
FIGURE 1. AC Test Circuit
www.fairchildsemi.com
FIGURE 2. AC Waveforms
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부품번호상세설명 및 기능제조사
FST34X2245QSP

32-Bit Bus Switch with 25 Series Resistors in Outputs

Fairchild Semiconductor
Fairchild Semiconductor

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