HD74HC148 Datasheet, PDF (2/6 Pages) Hitachi Semiconductor – 8-to-3-line Octal Priority Encoder

HD74HC148
Pin Arrangement
41
52
Inputs
63
74
EI 5
Outputs
A2 6
A1 7
GND 8
4
5
EO
6
GS
7
3
EI
2
A2
1
A1
0
A0
(Top view)
16 V_CC
15 EO
Outputs
14 GS
13 3
12 2
11 1
Inputs
10 0
9 A0 Output
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage range
VCC
–0.5 to +7.0
V
Input voltage
VIN
–0.5 to VCC + 0.5
V
Output voltage
VOUT
–0.5 to VCC + 0.5
V
Output current
DC current drain per VCC, GND
DC input diode current
IOUT
ICC, IGND
IIK
±25
mA
±50
mA
±20
mA
DC output diode current
IOK
±20
mA
Power dissipation per package
PT
500
mW
Storage temperature
Tstg
–65 to +150
°C
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
Symbol
Ratings
Supply voltage
VCC
2 to 6
Input / Output voltage
VIN, VOUT
0 to VCC
Operating temperature
Ta
–40 to 85
Input rise / fall time^*1
0 to 1000
tr, tf
0 to 500
0 to 400
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Unit
V
V
°C
ns
Conditions
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
Rev.2.00, Oct 11, 2005 page 2 of 5