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IDT74FCT2157ATPB

更新时间： 2024-11-29 22:35:15
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艾迪悌 - IDT 复用器输入元件
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7页 139K
描述
FAST CMOS QUAD 2-INPUT MULTIPLEXER

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IDT74FCT2157ATPB 数据手册

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IDT54/74FCT157T/AT/CT/DT  
IDT54/74FCT257T/AT/CT/DT  
IDT54/74FCT2257T/AT/CT  
FAST CMOS  
QUAD 2-INPUT  
MULTIPLEXER  
Integrated Device Technology, Inc.  
DESCRIPTION:  
FEATURES:  
The FCT157T, FCT257T/FCT2257T are high-speed quad  
2-inputmultiplexersbuiltusinganadvanceddualmetalCMOS  
technology. Four bits of data from two sources can be  
selected using the common select input. The four buffered  
outputs present the selected data in the true (non-inverting)  
form.  
• Common features:  
– Low input and output leakage ≤1µA (max.)  
– CMOS power levels  
– True TTL input and output compatibility  
– VOH = 3.3V (typ.)  
– VOL = 0.3V (typ.)  
The FCT157T has a common, active-LOW, enable input.  
When the enable input is not active, all four outputs are held  
LOW. A common application of ‘FCT157T is to move data  
from two different groups of registers to a common bus.  
Another application is as a function generator. The ‘FCT157T  
can generate any four of the 16 different functions of two  
variables with one variable common.  
– Meets or exceeds JEDEC standard 18 specifications  
– Product available in Radiation Tolerant and Radiation  
Enhanced versions  
– Military product compliant to MIL-STD-883, Class B  
and DESC listed (dual marked)  
– Available in DIP, SOIC, SSOP, QSOP, CERPACK  
and LCC packages  
The FCT257T/FCT2257T have a common Output Enable  
(OE) input. When OE is HIGH, all outputs are switched to a  
high-impedancestateallowingtheoutputstointerfacedirectly  
with bus-oriented systems.  
• Features for FCT157T/257T:  
– Std., A, C and D speed grades  
– High drive outputs (-15mA IOH, 48mA IOL)  
• Features for FCT2257T:  
The FCT2257T has balanced output drive with current  
limiting resistors. This offers low ground bounce, minimal  
undershoot and controlled output fall times-reducing the need  
for external series terminating resistors. FCT2xxxT parts are  
plug-in replacements for FCTxxxT parts.  
– Std., A, and C speed grades  
– Resistor outputs (-15mA IOH, 12mA IOL Com.)  
(-12mA IOH, 12mA IOL Mil.)  
– Reduced system switching noise  
FUNCTIONAL BLOCK DIAGRAM  
PIN CONFIGURATIONS  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
S
I0A  
Vcc  
E or OE*  
I0C  
I1C  
S
P16-1,  
D16-1,  
SO16-1,  
SO16-7  
&
1A  
I
Z
A
157 Only  
E
Z
C
I
I
0B  
1B  
3 other multiplexers  
I0D  
E16-1  
I
1D  
Z
B
1B 1D  
I
Z
D
–I  
GND  
Z B–Z D  
2537 drw 02  
DIP/SOIC/QSOP/CERPACK  
TOP VIEW  
0B 0D  
I
–I  
1A  
I
A
Z
INDEX  
0A  
I
3
2
20 19  
18  
1A  
I
4
5
6
7
8
I0C  
I1C  
NC  
ZC  
I0D  
1
257 Only OE  
ZA  
NC  
I0B  
I1B  
17  
16  
15  
14  
L20-2  
2537 drw 01  
10 11 12 13  
9
LCC  
2537 drw 03  
TOP VIEW  
* E for FCT157, OE for FCT257/FCT2257.  
The IDT logo is a registered trademark of Integrated Device Technology, Inc.  
MILITARY AND COMMERCIAL TEMPERATURE RANGES  
JUNE 1996  
1996 Integrated Device Technology, Inc.  
6.6  
2537/6  
1
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