STMicroelectronics M54HC148 Rad-hard 8 to 3 line priority encoder Datasheet

M54HC148
RAD-HARD 8 TO 3 LINE PRIORITY ENCODER
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HIGH SPEED:
tPD = 16ns (TYP.) at VCC = 6V
LOW POWER DISSIPATION:
ICC = 4µA(MAX.) at TA=25°C
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
54 SERIES 148
SPACE GRADE-1: ESA SCC QUALIFIED
50 krad QUALIFIED, 100 krad AVAILABLE ON
REQUEST
NO SEL UNDER HIGH LET HEAVY IONS
IRRADIATION
DEVICE FULLY COMPLIANT WITH
SCC-9410-017
DESCRIPTION
The M54HC148 is an high speed CMOS 8 TO 3
LINE PRIORITY ENCODER fabricated with
silicon gate C2MOS technology.
DILC-16
FPC-16
ORDER CODES
PACKAGE
FM
EM
DILC
FPC
M54HC148D
M54HC148K
M54HC148D1
M54HC148K1
The M54HC148 encodes eight data lines to
three-line (4-2-1) binary (octal). Cascading
circuitry (enable input EI and enable output EO)
has been provided to allow octal expansion
without the need for external circuitry. Data inputs
are active at the low logic level.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION
March 2004
1/10
M54HC148
IEC LOGIC SYMBOLS
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN N°
SYMBOL
9, 7, 6
A0 to A2
0 to 7
10, 11, 12,
13, 1, 2, 3, 4
15
5
14
8
16
NAME AND FUNCTION
Data Outputs
Data Inputs
EO
EI
GS
GND
VCC
Enable Output
Enable Input
Priority Flag Output
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUTS
E1
0
1
2
3
4
5
6
7
A2
A1
A0
GS
E0
H
L
L
L
L
L
L
L
L
L
X
H
X
X
X
X
X
X
X
L
X
H
X
X
X
X
X
X
L
H
X
H
X
X
X
X
X
L
H
H
X
H
X
X
X
X
L
H
H
H
X
H
X
X
X
L
H
H
H
H
X
H
X
X
L
H
H
H
H
H
X
H
X
L
H
H
H
H
H
H
X
H
L
H
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
H
H
L
L
H
H
L
L
H
H
H
H
L
H
L
H
L
H
L
H
H
H
L
L
L
L
L
L
L
L
H
L
H
H
H
H
H
H
H
H
X : Don’t Care
2/10
M54HC148
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Supply Voltage
Value
Unit
-0.5 to +7
V
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
V
DC Input Diode Current
± 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
± 25
mA
± 50
mA
VI
DC Input Voltage
VO
DC Output Voltage
IIK
ICC or IGND DC VCC or Ground Current
PD
Power Dissipation
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
V
300
mW
-65 to +150
°C
265
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
3/10
M54HC148
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Supply Voltage
VI
Input Voltage
VO
Output Voltage
Top
Operating Temperature
Input Rise and Fall Time
tr, tf
Value
Unit
2 to 6
V
0 to VCC
V
0 to VCC
V
-55 to 125
°C
VCC = 2.0V
0 to 1000
ns
VCC = 4.5V
0 to 500
ns
VCC = 6.0V
0 to 400
ns
DC SPECIFICATIONS
Test Condition
Symbol
VIH
VIL
VOH
VOL
II
ICC
4/10
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
Typ.
Max.
1.5
3.15
4.2
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
1.5
3.15
4.2
0.5
1.35
1.8
V
0.5
1.35
1.8
2.0
IO=-20 µA
1.9
2.0
1.9
1.9
4.5
IO=-20 µA
4.4
4.5
4.4
4.4
6.0
IO=-20 µA
5.9
6.0
5.9
5.9
4.5
IO=-4.0 mA
4.18
4.31
4.13
4.10
5.68
Unit
V
V
6.0
IO=-5.2 mA
2.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=20 µA
0.0
0.1
0.1
0.1
6.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=4.0 mA
0.17
0.26
0.33
0.40
6.0
IO=5.2 mA
0.18
0.26
0.33
0.40
6.0
VI = VCC or GND
± 0.1
±1
±1
µA
6.0
VI = VCC or GND
4
40
80
µA
5.8
5.63
5.60
V
M54HC148
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Symbol
Parameter
tTLH tTHL Output Transition
Time
tPLH tPHL Propagation Delay
Time (In - A0, A1,
A2)
tPLH tPHL Propagation Delay
Time (In - EO, GS)
tPLH tPHL Propagation Delay
Time (EI -EO)
tPLH tPHL Propagation Delay
Time (EI -GS)
tPLH tPHL Propagation Delay
Time (EI - A0, A1,
A2)
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Typ.
Max.
30
8
7
60
19
16
60
19
16
40
14
12
40
14
12
40
14
12
75
15
13
150
30
26
150
30
26
115
23
20
115
23
20
115
23
20
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
95
19
16
190
38
32
190
38
32
145
29
25
145
29
25
145
29
25
Unit
Max.
110
22
19
225
45
38
225
45
38
175
35
30
175
35
30
175
35
30
ns
ns
ns
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
VCC
(V)
Value
TA = 25°C
Min.
Typ.
Max.
10
CIN
Input Capacitance
5.0
5
CPD
Power Dissipation
Capacitance (note
1)
5.0
60
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
10
Unit
Max.
10
pF
pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC
5/10
M54HC148
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAY TIMES,FOR INVERTING AND NON INVERTING OUTPUTS
(f=1MHz; 50% duty cycle)
6/10
M54HC148
TYPICAL APPLICATION
7/10
M54HC148
DILC-16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
2.1
2.71
0.083
0.107
a1
3.00
3.70
0.118
0.146
a2
0.63
1.14
0.025
B
1.82
2.39
0.072
b
0.40
0.45
0.50
0.016
0.018
0.020
b1
0.20
0.254
0.30
0.008
0.010
0.012
D
20.06
20.32
20.58
0.790
0.800
0.810
e
7.36
7.62
7.87
0.290
0.300
0.310
e1
0.88
2.54
0.035
0.045
0.094
0.100
e2
17.65
17.78
17.90
0.695
0.700
0.705
e3
7.62
7.87
8.12
0.300
0.310
0.320
F
7.29
7.49
7.70
0.287
0.295
0.303
I
3.83
0.151
K
10.90
12.1
0.429
0.476
L
1.14
1.5
0.045
0.059
0056437F
8/10
M54HC148
FPC-16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
6.75
6.91
7.06
0.266
0.272
0.278
B
9.76
9.94
10.14
0.384
0.392
0.399
C
1.49
1.95
0.059
D
0.102
0.127
0.152
0.004
0.005
0.006
E
8.76
8.89
9.01
0.345
0.350
0.355
F
0.077
1.27
G
0.38
H
6.0
L
18.75
M
0.33
0.050
0.43
0.48
0.015
0.017
0.019
0.237
0.38
N
22.0
0.738
0.43
0.013
0.867
0.015
4.31
0.017
0.170
G
F
D
H
9
16
A
N
L
8
1
H
E
B
M
C
0016030E
9/10
M54HC148
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mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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10/10
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