HD74HC149RPEL [RENESAS]
HC SERIES, 8-BIT ENCODER, PDSO20, 12.80 X 7.50 MM, 1.27 MM PITCH, PLASTIC, SOP-20;
| 型号： | HD74HC149RPEL |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | HC SERIES, 8-BIT ENCODER, PDSO20, 12.80 X 7.50 MM, 1.27 MM PITCH, PLASTIC, SOP-20 编码器 光电二极管 逻辑集成电路 |
| 文件： | 总8页 (文件大小：199K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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HD74HC149
8-to-8-line Priority Encoder
REJ03D0574-0200
(Previous ADE-205-448)
Rev.2.00
Oct 11, 2005
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 - Y7) is low, P output is low and this indicates active conditi
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
Ordering Information
ge
eviation
Taping Abbreviation
(Quantity)
Part Name
Package Type
HD74HC149RPEL SOP-20 pin (JEDEC
P
EL (1,000 pcs/reel)
Function Table
In
Outputs
0
X
1
X
H
X
X
X
X
X
X
L
2
X
H
X
X
X
X
X
L
3
X
H
X
X
X
X
L
H
X
X
X
L
X
L
X
L
X
H
L
E
H
L
L
L
L
L
L
L
L
L
Y0
H
H
H
H
H
H
H
H
H
L
Y1
H
H
H
H
H
H
H
H
L
Y2
H
H
H
H
H
H
H
L
Y3
H
H
H
H
H
H
L
Y4
H
H
H
H
H
L
Y5
H
H
H
H
L
Y6
H
H
H
L
Y7
H
H
L
P
H
H
L
L
L
L
L
L
L
L
H
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
H
H
X
H
H
H
H
H
H
X
H
H
H
H
L
H
H
H :
L :
X :
High level
Low level
Irrelevant
Rev.2.00, Oct 11, 2005 page 1 of 5
HD74HC149
Pin Arrangement
0
1
2
3
4
5
6
7
E
1
2
3
4
5
6
7
8
9
20 VCC
19
18
17
16
15
14
13
12
1
Y
Y
Y
Y
Y
Y
Y
Y
0
1
2
3
4
5
6
7
Inputs
Outputs
GND 10
(Top view)
Logic Diagram
7
6
Y
7
Y
Y
Y
6
5
5
4
3
2
Y
3
Y
Y
2
1
0
1
0
Y
P
E
Rev.2.00, Oct 11, 2005 page 2 of 5
HD74HC149
Absolute Maximum Ratings
Item
Supply voltage range
Input / Output voltage
Input / Output diode current
Output current
Symbol
VCC
Ratings
–0.5 to 7.0
–0.5 to VCC +0.5
±20
Unit
V
Vin, Vout
IIK, IOK
IO
V
mA
mA
mA
mW
°C
±25
VCC, GND current
ICC or IGND
PT
±50
Power dissipation
500
Storage temperature
Tstg
–65 to +150
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Recommended Operating Conditions
Item
Supply voltage
Symbol
VCC
Ratings
2 to 6
Unit
V
Conditions
Input / Output voltage
Operating temperature
VIN, VOUT
Ta
0 to VCC
–40 to 85
0 to 1000
0 to 500
0 to 400
V
VCC = 2.0 V
Input rise / fall time*1
tr, tf
CC = 4.5 V
= 6.0 V
Note: 1. This item guarantees maximum limit when one input s
Waveform: Refer to test circuit of switching charac
Electrical Characteristics
Ta =
°C
Item
Symbol VCC (V)
VIH
Unit
Test Conditions
Min
1
5
4.2
—
Max
—
Input voltage
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
V
V
V
—
—
VIL
35
1.8
—
0.5
1.35
1.8
—
—
—
Output voltage
VO
4.18
5.68
—
0
4.5
6.0
—
1.9
4.4
5.9
4.13
5.63
—
Vin = VIH or VIL IOH = –20 µA
—
—
—
—
—
—
IOH = –4 mA
IOH = –5.2 mA
—
—
—
VOL
0.0
0.0
0.0
—
0.1
0.1
0.1
0.26
0.26
±0.1
4.0
0.1
0.1
0.1
0.33
0.33
±1.0
40
V
Vin = VIH or VIL IOL = 20 µA
—
—
—
—
—
—
IOL = 4 mA
—
—
—
IOL = 5.2 mA
Input current
Iin
—
—
—
µA Vin = VCC or GND
Quiescent supply
current
ICC
—
—
—
µA Vin = VCC or GND, Iout = 0 µA
Rev.2.00, Oct 11, 2005 page 3 of 5
HD74HC149
Switching Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Typ Max
Ta = –40 to +85°C
Item
Symbol VCC (V)
Unit
Test Conditions
Min
—
—
—
—
—
—
—
—
—
—
—
—
—
Min
—
—
—
—
—
—
—
—
—
—
—
—
—
Max
175
35
Propagation delay
time
tPLH
tPHL
tTLH
tTHL
Cin
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
—
—
16
—
—
13
—
—
5
140
28
24
155
31
26
75
15
13
75
15
13
10
ns 0 - 7 to Y, P
30
195
39
ns E to Y, P
33
Output rise time
Output fall time
95
ns
ns
pF
19
—
—
5
16
95
19
—
5
16
Input capacitance
10
Test Circuit
Measurement po
*
C L
Notefig capacitance.
Waveforms
• Waveform −
tf
VCC
0 V
90%
50%
90%
50%
Input
10%
10%
tPLH
tPHL
VOH
Output
90%
90%
50%
10%
50%
10%
VOL
tTLH
tTHL
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns
2. The output are measured one at a time with one transition per measurement.
Rev.2.00, Oct 11, 2005 page 4 of 5
HD74HC149
Package Dimensions
JEITA Package Code
RENESAS Code
Previous Code
FP-20DBV
MASS[Typ.]
0.52g
P-SOP20-7.5x12.8-1.27
PRSP0020DC-A
*1
D
F
NOTE)
20
11
1. DIMENSIONS"*1 (Nom)"AND"*2"
@ DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
@ INCLUDE TRIM OFFSET.
bp
Index mark
Terminal cross section
( Ni/Pd/Au plating )
Dimension in Millimeters
Reference
Symbol
Min Nom Max
1
10
x
D
E
12.80 13.2
7.50
*3
e
bp
Z
M
L1
A2
A1
A
bp
b1
c
0.10 0.20 0.30
2.65
0.34 0.40 0.46
0.20 0.25 0.30
c1
θ
0° 8°
10.00 10.40 10.65
y
HE
e
x
1.27
0.12
0.15
y
Z
L
L1
0.935
0.40 0.70 1.27
1.45
Rev.2.00, Oct 11, 2005 page 5 of 5
Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
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