HD74HC149RPEL [RENESAS]

HC SERIES, 8-BIT ENCODER, PDSO20, 12.80 X 7.50 MM, 1.27 MM PITCH, PLASTIC, SOP-20;
HD74HC149RPEL
型号: HD74HC149RPEL
厂家: RENESAS TECHNOLOGY CORP    RENESAS TECHNOLOGY CORP
描述:

HC SERIES, 8-BIT ENCODER, PDSO20, 12.80 X 7.50 MM, 1.27 MM PITCH, PLASTIC, SOP-20

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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 , 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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