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부품번호 | FST34X245QSP 기능 |
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기능 | 32-Bit Bus Switch | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 5 페이지수
December 2001
Revised December 2001
FST34X245
32-Bit Bus Switch
General Description
The Fairchild Switch FST34X245 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.
Features
s 4Ω switch connection between two ports
s Minimal propagation delay through the switch
s Low lCC
s Zero bounce in flow-through mode
s Control inputs compatible with TTL level
s 32-bit version of FST3245
s Packaged in 20.5mm 80-lead package
Ordering Code:
Order Number Package Number
Package Description
FST34X245QSP
MQA80A
80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
© 2001 Fairchild Semiconductor Corporation DS500554
www.fairchildsemi.com
AC Electrical Characteristics
Symbol
Parameter
TA = −40 °C to +85 °C,
CL = 50pF, RU = RD = 500Ω
VCC = 4.5 – 5.5V
VCC = 4.0V
Units
Conditions
Figure
Number
Min Max Min Max
tPHL, tPLH
Propagation Delay Bus to Bus
(Note 8)
0.25 0.25 ns VI = OPEN
Figures
1, 2
tPZH, tPZL
Output Enable Time
1.5 5.9
6.4 ns VI = 7V for tPZL
VI = OPEN for tPZH
Figures
1, 2
tPHZ, tPLZ
Output Disable Time
1.5 6.0
5.7 ns VI = 7V for tPLZ
VI = OPEN for tPHZ
Figures
1, 2
Note 8: 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 9)
Symbol
Parameter
Typ
CIN Control Pin Input Capacitance
3
CI/O Input/Output Capacitance
5
Note 9: TA = +25°C, 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 Ω source terminated in 50 Ω
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
4
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부품번호 | 상세설명 및 기능 | 제조사 |
FST34X245QSP | 32-Bit Bus Switch | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |