HD74HC688 PDF даташит
Спецификация HD74HC688 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «8-bit Magnitude Comparator». |
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Детали детали
Номер произв | HD74HC688 |
Описание | 8-bit Magnitude Comparator |
Производители | Hitachi Semiconductor |
логотип |
9 Pages
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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
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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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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HD74HC688 | 8-bit Magnitude Comparator | Hitachi Semiconductor |
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DataSheet26.com | 2020 | Контакты | Поиск |