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HD74HC678のメーカーはHitachi Semiconductorです、この部品の機能は「16-bit Address Comparator」です。 |
部品番号 | HD74HC678 |
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部品説明 | 16-bit Address Comparator | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHD74HC678ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
HD74HC678
16-bit Address Comparator
Description
The HD74HC678 address comparator simplifies addressing of memory boards and/or other peripheral
devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder
determines what input information applied to the 16 A inputs must be low or high to cause a low state at the
output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines
that inputs A1 through A7 must be low and that inputs A8 through A16 must be high to cause the output to go
low. Equality of the address applied at the A inputs to the preprogrammed address is indicated by the
output being low. The HD74HC678 features a transparent latch and a latch enabled input (C). When C is
high, the device is in the transparent mode. When C is low, the previous logic state of Y is latched.
Features
• High Speed Operation
• 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 Pin Arrangement
A1 1
A2 2
A3 3
A4 4
A5 5
A6 6
A7 7
A8 8
A9 9
A10 10
A11 11
GND 12
24 VCC
23 C
22 Y
21 P3
20 P2
19 P1
18 P0
17 A16
16 A15
15 A14
14 A13
13 A12
(Top view)
HD74HC678
3
3Pages HD74HC678
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
— — 330 —
— 30 66 —
— — 56 —
Max Unit
410 ns
82
70
tPLH 2.0 — — 210 — 265 ns
tPHL 4.5 — 21 42 — 53
6.0 — — 36 — 45
tPLH 2.0 — — 150 — 190 ns
tPHL 4.5 — 13 30 — 38
6.0 — — 26 — 33
Setup time
tsu 2.0 100 — — 125 — ns
4.5 20 12 — 25 —
6.0 17 — — 21 —
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 95 ns
4.5 — — 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Test Conditions
P to Y
A to Y
C to Y
A to C
6
6 Page | |||
ページ | 合計 : 8 ページ | ||
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PDF ダウンロード | [ HD74HC678 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
HD74HC670 | 4-by-4 Register File (with 3-state outputs) | Hitachi Semiconductor |
HD74HC673 | 16-bit Shift Register | Hitachi Semiconductor |
HD74HC674 | 16-bit Shift Register | Hitachi Semiconductor |
HD74HC677 | 16-bit Address Comparator | Hitachi Semiconductor |