74HC148 Hitachi, 74HC148 Datasheet

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74HC148

Manufacturer Part Number
74HC148
Description
8-to-3-line Octal Priority Encoder
Manufacturer
Hitachi
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
74HC148
Manufacturer:
ST
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Part Number:
74HC148A
Manufacturer:
HI
Quantity:
24
Part Number:
74HC148N
Manufacturer:
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Quantity:
10
Description
The HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable
input EI and enable output EO) is provided to allow octal expansion without the need for external circuitry.
The data inputs and outputs are active at the low logic level.
Features
Function Table
Inputs
EI
H
L
L
L
L
L
L
L
L
L
H :
L :
X :
High Speed Operation: t
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
Low Input Current: 1 µA max
Low Quiescent Supply Current: I
0
X
H
X
X
X
X
X
X
X
L
High level
Low level
Irrelevant
1
X
H
X
X
X
X
X
X
L
H
2
X
H
X
X
X
X
X
L
H
H
8-to-3-line Octal Priority Encoder
pd
3
X
H
X
X
X
X
L
H
H
H
(0 - 7 to A
CC
= 2 to 6 V
HD74HC148
CC
4
X
H
X
X
X
L
H
H
H
H
(static) = 4 µA max (Ta = 25°C)
0
- A
2
5
X
H
X
X
L
H
H
H
H
H
) = 15 ns typ (C
6
X
H
X
L
H
H
H
H
H
H
7
X
H
L
H
H
H
H
H
H
H
L
= 50 pF)
Outputs
A
H
H
L
L
L
L
H
H
H
H
2
A
H
H
L
L
H
H
L
L
H
H
1
A
H
H
L
H
L
H
L
H
L
H
0
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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74HC148 Summary of contents

Page 1

... Octal Priority Encoder Description The HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) is provided to allow octal expansion without the need for external circuitry. The data inputs and outputs are active at the low logic level. ...

Page 2

... HD74HC148 Pin Arrangement Inputs Outputs GND (Top view Outputs Inputs Output 0 ...

Page 3

... HD74HC148 Unit Test Conditions Vin = Vin = 1.0 A Vin = V or GND ...

Page 4

... HD74HC148 AC Characteristics ( pF, Input t L Item Symbol V Propagation delay t 2.0 PLH time t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 t 2.0 PLH t 4.5 PHL 6.0 Output rise/fall t 2.0 TLH time t 4.5 THL 6.0 Input capacitance Cin — ns – +85 C (V) Min Typ Max Min ...

Page 5

... Max 16 1 1.3 1.11 Max 2.54 0.25 0.48 0. – 15 Hitachi Code JEDEC EIAJ Weight (reference value) Unit: mm 7.62 + 0.13 0.25 – 0.05 DP-16 Conforms Conforms 1.07 g ...

Page 6

... Base material dimension 10.06 10.5 Max 9 8 0.80 Max 0.08 0.06 0.15 M 0.12 + 0.20 7.80 – 0.30 1.15 0 – 8 0.70 0.20 Hitachi Code FP-16DA JEDEC — EIAJ Conforms Weight (reference value) 0.24 g Unit: mm ...

Page 7

... Base material dimension 9.9 10.3 Max 9 8 1.27 0.635 Max 0.15 0. 0.10 6.10 – 0.30 1.08 0 – 0.67 0.60 – 0.20 Hitachi Code FP-16DN JEDEC Conforms EIAJ Conforms Weight (reference value) 0.15 g Unit: mm ...

Page 8

... Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document ...

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