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Número de pieza | HD74HC688 | |
Descripción | 8-bit Magnitude Comparator | |
Fabricantes | Hitachi Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de HD74HC688 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
No Preview Available ! 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
1 page HD74HC688
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Symbol
Propagation delay tPLH
time
t PHL
VCC (V)
2.0
4.5
6.0
Min Typ Max Min
— — 210 —
— 17 42 —
— — 36 —
Max Unit
265 ns
53
45
tPLH 2.0 — — 120 — 150 ns
tPHL 4.5 — 9 24 — 30
6.0 — — 20 — 26
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Test Conditions
P or Q to output
Enable to P=Q
5
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet HD74HC688.PDF ] |
Número de pieza | Descripción | Fabricantes |
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HD74HC688 | 8-bit Magnitude Comparator | Hitachi Semiconductor |
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