Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74HC148
CMOS IC
8-LINE TO 3-LINE PRIORITY
ENCODERS

DESCRIPTION
The UTC U74HC148 devices encode eight data lines to 3-line
binary (octal). It feature priority decoding of the inputs to ensure that
only the highest-order data line is encoded. (enable input EI and
enable output EO) have been provided to allow octal expansion
without the need for external circuitry. Data inputs and outputs are
active at the low logic level.

SOP-16
FEATURES
* Wide supply voltage range from 2.0V to 6.0V
* Low static power consumption; ICC=8μA (Max.)
* Encode Eight Data Lines to 3-Line Binary (Octal)
* High Noise Immunity

ORDERING INFORMATION
Ordering Number
U74HC148G-P16-R

Package
TSSOP-16
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
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U74HC148

PIN CONFIGURATION

FUNCTION TABLE
INPUTS
EI
0
1
2
3
4
5
6
H
X
X
X
X
X
X
X
L
H
H
H
H
H
H
H
L
X
X
X
X
X
X
X
L
X
X
X
X
X
X
L
L
X
X
X
X
X
L
H
L
X
X
X
X
L
H
H
L
X
X
X
L
H
H
H
L
X
X
L
H
H
H
H
L
X
L
H
H
H
H
H
L
L
H
H
H
H
H
H
Note: H: High voltage level; L: Low voltage level; X: Don’t care
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
CMOS IC
7
X
H
L
H
H
H
H
H
H
H
A2
H
H
L
L
L
L
H
H
H
H
A1
H
H
L
L
H
H
L
L
H
H
OUTPUTS
A0
H
H
L
H
L
H
L
H
L
H
GS
H
H
L
L
L
L
L
L
L
L
EO
H
L
H
H
H
H
H
H
H
H
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U74HC148

CMOS IC
LOGIC DIAGRAM (positive logic)
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U74HC148

CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
CONDITIONS
RATINGS
UNIT
Supply Voltage
VCC
-0.5 ~ +7.0
V
Input Voltage
VIN
-0.5 ~ VCC+0.5
V
Output Voltage
VOUT
Active Mode
-0.5 ~ VCC+0.5
V
Continuous VCC or GND
ICC
±50
mA
Current
Continuous Output Current
IOUT
VOUT=0V ~ VCC
±25
mA
Input Clamp Current (Note 2)
IIK
VIN<0V or VIN>VCC
±20
mA
Output Clamp Current
IOK
VOUT>VCC or VOUT<0V
±20
mA
(Note 2)
Storage Temperature Range
TSTG
-65 ~ +150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Transition Rise or Fall
Rate

SYMBOL
VCC
VIN
VOUT
TA
∆t/∆v
TEST CONDITIONS
MIN
2.0
0
0
-40
TYP
5.0
VCC=2.0V
VCC=4.5V
VCC=6.0V
MAX
6.0
VCC
VCC
85
1000
500
400
UNIT
V
V
V
°C
ns
ns
ns
MAX
UNIT
V
V
V
V
V
V
V
V
V
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
High-level Input Voltage
VIH
Low-level Input Voltage
VIL
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current
VOH
VOL
II(LEAK)
Quiescent Supply Current
ICC
Input Capacitance
CI
TEST CONDITIONS
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VIN=VIH or VIL
VCC=4.5V
IOH=-20μA
VCC=6.0V
VCC=4.5V, VIN=VIH or VIL,
IOH=-4mA
VCC=6.0V, VIN=VIH or VIL,
IOH=-5.2mA
VCC=2.0V
VIN=VIH or VIL
VCC=4.5V
IOH=20μA
VCC=6.0V
VCC=4.5V, VIN=VIH or VIL, IOH=4mA
VCC=6.0V, VIN=VIH or VIL,
IOH=5.2mA
VCC=6.0V, VIN= VCC or GND
VCC=6.0V, VIN=VCC or GND,
IOUT=0A
VCC=2.0~6.0V, VIN=VCC or GND
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1.5
3.15
4.2
TYP
0.5
1.35
1.8
1.9
4.4
5.9
1.998
4.498
5.998
3.98
V
5.48
V
0.002
0.001
0.001
3
0.1
0.1
0.1
0.26
V
V
V
V
0.26
V
±0.1
μA
8
μA
10
pF
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
CMOS IC
SWITCHING CHARACTERISTICS (CL=50pF, TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
Propagation delay from input
(1-7) to output(A0~A2)
Propagation delay from input
(0-7) to output(EO)
Propagation delay from input
(0-7) to output(GS)
tPD
Propagation delay from input
(EI) to output(A0~A2)
Propagation delay from input
(EI) to output(GS)
Propagation delay from input
(EI) to output(EO)
Propagation delay to
output(Any)

tt
TEST CONDITIONS
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
MIN
TYP
69
23
21
60
20
17
75
25
21
78
26
22
57
19
16
66
22
19
28
8
6
MAX
180
36
31
150
30
26
190
38
32
195
39
33
145
29
25
166
33
28
75
15
13
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
TYP
MAX
UNIT
OPERATING CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
Power Dissipation
Capacitance
SYMBOL
CPD
TEST CONDITIONS
No load.
UNISONIC TECHNOLOGIES CO., LTD
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MIN
35
pF
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U74HC148

CMOS IC
TEST CIRCUIT AND WAVEFORMS
Note: CL includes probe and jig capacitance. CL=50pF
Notes: 1. CL includes probe and jig capacitance.
2. All input pulses are supplied by generators having the following characteristics: PRR ≤10MHz, ZO = 50Ω.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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