Renesas HD74HC149 8-to-8-line priority encoder Datasheet

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HD74HC149
8-to-8-line Priority Encoder
ADE-205-448 (Z)
1st. Edition
Sep. 2000
Description
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y0 - Y7).
It is the logical combination of a HD74HC148 8-3 line priority encoder driving a HD74HC138 3-8 line
decoder.
Only one request output can be low at a time. The output that is low is dependent on the highest priority
request that is low. The order of priority is 7 highest and 0 lowest.
When E input is high, all outputs are high.
When a output (Y0 - Y 7) is low, P output is low and this indicates active condition.
Features
•
•
•
•
•
High Speed Operation: tpd (0 - 7 to Y) = 16 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)
HD74HC149
Function Table
Inputs
Outputs
0
1
2
3
4
5
6
7
E
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
P
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
L
L
H
H
H
H
H
H
H
L
L
X
X
X
X
X
X
L
H
L
H
H
H
H
H
H
L
H
L
X
X
X
X
X
L
H
H
L
H
H
H
H
H
L
H
H
L
X
X
X
X
L
H
H
H
L
H
H
H
H
L
H
H
H
L
X
X
X
L
H
H
H
H
L
H
H
H
L
H
H
H
H
L
X
X
L
H
H
H
H
H
L
H
H
L
H
H
H
H
H
L
X
L
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
L
H :
L :
X :
High level
Low level
Irrelevant
Pin Arrangement
Inputs
0
1
20 VCC
1
2
19 Y0
2
3
18 Y1
3
4
17 Y2
4
5
16 Y3
5
6
15 Y4
6
7
14 Y5
7
8
13 Y6
E
9
12 Y7
11 P
GND 10
(Top view)
2
Outputs
HD74HC149
Logic Diagram
7
Y7
6
Y6
5
4
3
Y5
Y4
Y3
2
Y2
1
Y1
0
Y0
P
E
3
HD74HC149
DC Characteristics
Ta = –40 to
+85°C
Ta = 25°C
Item
Symbol
VCC (V) Min Typ Max Min
Max
Unit
Input voltage
VIH
2.0
1.5 —
—
1.5
—
V
4.5
3.15 —
—
3.15
—
6.0
4.2 —
—
4.2
—
2.0
—
—
0.5
—
0.5
4.5
—
—
1.35 —
1.35
6.0
—
—
1.8
—
1.8
2.0
1.9 2.0 —
1.9
—
4.5
4.4 4.5 —
4.4
—
6.0
5.9 6.0 —
5.9
—
4.5
4.18 —
—
4.13
—
I OH = –4 mA
6.0
5.68 —
—
5.63
—
I OH = –5.2 mA
2.0
—
0.0 0.1
—
0.1
4.5
—
0.0 0.1
—
0.1
6.0
—
0.0 0.1
—
0.1
4.5
—
—
0.26 —
0.33
I OL = 4 mA
6.0
—
—
0.26 —
0.33
I OL = 5.2 mA
VIL
Output voltage
VOH
VOL
Test Conditions
V
V
V
Vin = VIH or VIL I OH = –20 µA
Vin = VIH or VIL I OL = 20 µA
Input current
Iin
6.0
—
—
±0.1 —
±1.0
µA
Vin = VCC or GND
Quiescent supply
current
I CC
6.0
—
—
4.0
40
µA
Vin = VCC or GND, Iout = 0 µA
4
—
HD74HC149
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
VCC (V) Min Typ Max Min
Max
Unit
Test Conditions
Propagation delay t PLH
2.0
—
—
140 —
175
ns
0 - 7 to Y, P
time
4.5
—
16
28
—
35
6.0
—
—
24
—
30
t PLH
2.0
—
—
155 —
195
ns
E to Y, P
t PHL
4.5
—
13
31
—
39
6.0
—
—
26
—
33
Item
Symbol
t PHL
Output rise/fall
t TLH
2.0
—
—
75
—
95
time
t THL
4.5
—
5
15
—
19
6.0
—
—
13
—
16
—
—
5
10
—
10
Input capacitance
Cin
ns
pF
5
HD74HC149
Package Dimensions
Unit: mm
24.50
25.40 Max
1
7.00 Max
11
6.30
20
10
1.30
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
1.27 Max
7.62
2.54 Min 5.08 Max
0.89
+ 0.11
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
DP-20N
—
Conforms
1.26 g
Unit: mm
12.6
13 Max
11
1
10
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
20
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
6
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-20DA
—
Conforms
0.31 g
HD74HC149
Unit: mm
12.8
13.2 Max
11
1
10
0.20 ± 0.10
0.935 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*0.27 ± 0.05
0.25 ± 0.04
2.65 Max
7.50
20
0.25
10.40 +– 0.40
1.45
0° – 8°
0.57
0.70 +– 0.30
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-20DB
Conforms
—
0.52 g
7
HD74HC149
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
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received the latest product standards or specifications before final design, purchase or use.
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contact Hitachi’s sales office before using the product in an application that demands especially high
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