HD74HC298 PDF даташит
Спецификация HD74HC298 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «Quad. 2-input Multiplexers (with storage)». |
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Детали детали
Номер произв | HD74HC298 |
Описание | Quad. 2-input Multiplexers (with storage) |
Производители | Hitachi Semiconductor |
логотип |
8 Pages
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HD74HC298
Quad. 2-input Multiplexers (with storage)
Description
This circuit is controlled by the signals word select and clock. When the word select input is taken low
word 1 (A1, B1, C1 and D1) is presented to the inputs of the flip-flops, and when word select is high word 2
(A2, B2, C2 and D2) is presented to the inputs of the flip-flops. The selected word is clocked to the output
terminals on the negative edge of the clock pulse.
Features
• High Speed Operation: tpd (Clock to Q) = 19 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
Function Table
Inputs
Outputs
Word Select Clock
QA
QB
QC
QD
L a1 b1 c1 d1
H a2 b2 c2 d2
XH
QA0
QB0
QC0
QD0
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HD74HC298
Pin Arrangement
B2 1
A2 2
Data
inputs
A1 3
B1 4
C2 5
D2 6
D1 7
GND 8
A2 B2 QA
A1 QB
B1 QC
C2 QD
D2 CK
D1
WS
C1
(Top view)
16 VCC
15 QA
14 QB
13 QC
Outputs
12 QD
11 Clock
10 Word
select
9
Data
input
C1
2
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HD74HC298
DC Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent supply
current
Ta = 25°C
Ta = –40 to
+85°C
Symbol
VIH
VCC (V) Min Typ Max Min
2.0 1.5 — — 1.5
4.5 3.15 — — 3.15
Max
—
—
Unit
V
6.0 4.2 — — 4.2 —
VIL 2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
VOH 2.0 1.9 2.0 — 1.9 — V
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 —
6.0 5.68 — — 5.63 —
VOL 2.0 — 0.0 0.1 — 0.1 V
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33
6.0 — — 0.26 — 0.33
Iin 6.0 — — ±0.1 — ±1.0 µA
ICC 6.0 — — 4.0 — 40 µA
Test Conditions
Vin = VIH or VIL IOH = –20 µA
IOH = –4 mA
IOH = –5.2 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 4 mA
IOL = 5.2 mA
Vin = VCC or GND
Vin = VCC or GND, Iout = 0 µA
3
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