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HD74HC688 PDF даташит

Спецификация HD74HC688 изготовлена ​​​​«Hitachi Semiconductor» и имеет функцию, называемую «8-bit Magnitude Comparator».

Детали детали

Номер произв HD74HC688
Описание 8-bit Magnitude Comparator
Производители Hitachi Semiconductor
логотип Hitachi Semiconductor логотип 

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HD74HC688 Даташит, Описание, Даташиты
HD74HC688
8-bit Magnitude Comparator
Description
The HD74HC688 compares bit for bit two 8-bit words and indicates whether or not they are equal. The
P=Q output indicates equality when it is low.
A single active low enable is provided to facilitate cascading of several packages and enable comparison of
words greater than 8-bits.
This device is useful in memory block decoding applications, where memory block enable signals must be
generated from computer address information.
Features
High Speed Operation: tpd (P or Q to Output) = 17 ns typ (CL = 50 pF
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Input
Data P, Q
P=Q
P>Q
P<Q
X
Enable G
L
L
L
H
P=Q
L
H
H
H









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HD74HC688 Даташит, Описание, Даташиты
HD74HC688
Pin Arrangement
G1
P0 2
Q0 3
P1 4
Q1 5
P2 6
Q2 7
P3 8
Q3 9
GND 10
(Top view)
20 VCC
19 P=Q
18 Q7
17 P7
16 Q6
15 P6
14 Q5
13 P5
12 Q4
11 Q4
2









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HD74HC688 Даташит, Описание, Даташиты
Block Diagram
P0
Q0
P1
Q1
P2
Q2
P3
Q3
P4
Q4
P5
Q5
P6
Q6
P7
Q7
G
HD74HC688
P=Q
3










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