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PDF HD74HC85 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC85 | |
| Descripción | 4-Bit Magnitude Comparator | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74HC85
4-Bit Magnitude Comparator
Description
The HD74HC85 id designed for high speed comparison of two four bit words. This circuit has eight
comparison input, 4 for each word; three cascade inputs (A < B, A > B, A = B); and three decision outputs
(A < B, A > B, A = B). The result of a comparison is indicated by a high level on one of the decision
outputs. thus it may be determined whether one word is “greater than,” “less than,” or “equal to” the other
word. by connecting the outputs of the least significant stage to the cascade inputs of the enxt stage, words
of greater than four bits can be compared. In addition the least significant stage must have a high level
applied to the A = B input, and a low level to the A < B, and A > B inputs.
Features
• High Speed Operation: tpd (Data Word Input to Output) = 20 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)
1 page  
HD74HC85
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 —
— 20 42 —
— — 36 —
Max Unit
265 ns
53
45
tPLH 2.0 — — 175 — 220 ns
tPHL 4.5 — 20 35 — 44
6.0 — — 30 — 37
tPLH 2.0 — — 125 — 155 ns
tPHL 4.5 — 12 25 — 31
6.0 — — 21 — 26
tPLH 2.0 — — 155 — 195 ns
tPHL 4.5 — 14 31 — 39
6.0 — — 26 — 33
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
Data word input to output
(Except A = Bout)
Data word input to A = Bout
A = Bin to A = Bout
Cascading input to output
(Except A = Bout)
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74HC85.PDF ] | |
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