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National Semiconductor Electronic Components Datasheet


74148

8-3 Line Priority Encoder



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74148 pdf
February 1988
MM54HC148 MM74HC148
8-3 Line Priority Encoder
General Description
This priority encoder utilizes advanced silicon-gate CMOS
technology It has the high noise immunity and low power
consumption typical of CMOS circuits as well as the speeds
and output drive similar to LB-TTL
This priority encoder accepts 8 input request lines 0– 7 and
outputs 3 lines A0–A2 The priority encoding ensures that
only the highest order data line is encoded Cascading cir-
cuitry (enable input EI and enable output EO) has been pro-
vided to allow octal expansion without the need for external
circuitry All data inputs and outputs are active at the low
logic level
All inputs are protected from damage due to static dis-
charge by internal diode clamps to VCC and ground
Features
Y Typical propagation delay 13 ns
Y Wide supply voltage range 2V – 6V
Connection Diagram
Dual-In-Line Package
Truth Table
Order Number MM54HC148 or MM74HC148
TL F 9390 – 1
Inputs
Outputs
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
HXXXXXXXX H H H H H
L HHHHHHHH H H H H L
L XXXXXXXL L L L L H
L XXXXXXLH L L H L H
L XXXXX LHH L H L L H
L XXXX LHHH L H H L H
L XXX LHHHH H L L L H
L XX LHHHHH H L H L H
L X LHHHHHH H H L L H
L LHHHHHHH H H H L H
H e High L e Low X e irrelevant
C1995 National Semiconductor Corporation TL F 9390
RRD-B30M105 Printed in U S A



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74148 pdf
Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VCC)
DC Input Voltage (VIN)
DC Output Voltage (VOUT)
Clamp Diode Current (IIK IOK)
DC Output Current per pin (IOUT)
DC VCC or GND Current per pin (ICC)
Storage Temperature Range (TSTG)
Power Dissipation (PD)
(Note 3)
S O Package only
b0 5 to a7 0V
b1 5 to VCC a1 5V
b0 5 to VCC a0 5V
g20 mA
g25 mA
g50 mA
b65 C to a150 C
600 mW
500 mW
Lead Temperature (TL)
(Soldering 10 sec )
260 C
Operation Conditions
Min Max Units
Supply Voltage (VCC)
DC Input or Output Voltage
2
0
(VIN VOUT)
Operating Temperature Range (TA)
MM74HC
b40
6
VCC
a85
V
V
C
MM54HC
b55 a125 C
Input Rise or Fall Times
(tr tf)
VCC e 2 0V
VCC e 4 5V
VCC e 6 0V
1000
500
400
ns
ns
ns
DC Electrical Characteristics (Note 4)
Symbol
Parameter
Conditions
74HC
54HC
VCC TA e 25 C TA e b40 to 85 C TA e b55 to 125 C Units
Typ Guaranteed Limits
VIH Minimum High Level
Input Voltage
2 0V
4 5V
6 0V
15
3 15
42
15
3 15
42
15 V
3 15 V
42 V
VIL Maximum Low Level
Input Voltage
2 0V
4 5V
6 0V
05
1 35
18
05
1 35
18
05 V
1 35 V
18 V
VOH
Minimum High Level VIN e VIH or VIL
Output Voltage
lIOUTl s 20 mA
2 0V 2 0 1 9
4 5V 4 5 4 4
6 0V 6 0 5 9
19
44
59
19 V
44 V
59 V
VIN e VIH or VIL
lIOUTl s 4 0 mA
lIOUTl s 5 2 mA
4 5V 4 7 3 96
6 0V 5 2 5 48
VOL Maximum Low Level VIN e VIH or VIL
Output Voltage
lIOUTl s 20 mA
2 0V 0 0 1
4 5V 0 0 1
6 0V 0 0 1
3 84
5 34
01
01
01
37 V
52 V
01 V
01 V
01 V
VIN e VIH or VIL
lIOUTl s 4 0 mA
lIOUTl s 5 2 mA
4 5V 0 2 0 26
6 0V 0 2 0 26
IIN Maximum Input VIN e VCC or GND 6 0V
Current
g0 1
0 33
0 33
g1 0
04
04
g1 0
V
V
mA
ICC Maximum Quiescent VIN e VCC or GND 6 0V
Supply Current
IOUT e 0 mA
80
80
160 mA
Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur
Note 2 Unless otherwise specified all voltages are referenced to ground
Note 3 Power Dissipation temperature derating plastic ‘‘N’’ package b12 mW C from 65 C to 85 C ceramic ‘‘J’’ package b12 mW C from 100 C to 125 C
Note 4 For a power supply of 5V g10% the worst case output voltages (VOH and VOL) occur for HC at 4 5V Thus the 4 5V values should be used when designing
with this supply Worst case VIH and VIL occur at VCC e 5 5V and 4 5V respectively (The VIH value at 5 5V is 3 85V ) The worst case leakage current (IIN ICC and
IOZ) occur for CMOS at the higher voltage and so the 6 0V values should be used
VIL limits are currently tested at 20% of VCC The above VIL specification (30% of VCC) will be implemented no later than Q1 CY’89
2



Part Number 74148
Description 8-3 Line Priority Encoder
Maker National Semiconductor - National Semiconductor
Total Page 6 Pages
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