STMICROELECTRONICS M74HC148C1R

M54HC148
M74HC148
8 TO 3 LINE PRIORITY ENCODER
.
.
.
.
.
.
.
.
HIGH SPEED
tPD = 15 ns (TYP.) AT VCC = 5 V
LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
IOH = IOL = 4 mA (MIN.)
BALANCED PROPAGATION DELAYS
tPLH = tPHL
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS148
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HC148F1R
M74HC148M1R
M74HC148B1R
M74HC148C1R
DESCRIPTION
The M54/74HC148 is a high speed CMOS 8-TO-3
LINE PRIORITY ENCODER fabricated in silicon
gate C2MOS technology.
PIN CONNECTIONS (top view)
It has the same high speed performance for LSTTL
combined with true CMOS low power consumption.
The M54/74HC148 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.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
NC =
No Internal
Connection
October 1992
1/11
M54/M74HC148
TRUTH TABLE
INPUTS
OUTPUTS
E1
H
0
X
1
X
2
X
3
X
4
X
5
X
6
X
7
X
A2
H
A1
H
A0
H
GS
H
E0
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
H
L
L
L
L
L
H
L
L
H
H
L
X
X
X
X
X
L
H
H
L
H
L
L
H
L
X
X
X
X
L
H
H
H
L
H
H
L
H
L
X
X
X
L
H
H
H
H
H
L
L
L
H
L
L
X
X
X
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
LL
H
H
L
L
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
X: Don’t Care
LOGIC DIAGRAM
2/11
M54/M74HC148
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN No
SYMBOL
NAME AND FUNCTION
9, 7, 6
11, 12, 13,
1, 2, 3, 4,
10
15
A0 to A2
0 to 7
Data Outputs
Data Inputs
EO
Enable Output
5
EI
Enable Input
14
8
GS
GND
Priority Flag Output
Ground (0V)
16
V CC
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
Value
Unit
VCC
VI
Supply Voltage
DC Input Voltage
-0.5 to +7
-0.5 to VCC + 0.5
V
V
VO
DC Output Voltage
-0.5 to VCC + 0.5
V
IIK
IOK
DC Input Diode Current
DC Output Diode Current
± 20
± 20
mA
mA
IO
DC Output Source Sink Current Per Output Pin
± 25
mA
ICC or IGND
Parameter
DC VCC or Ground Current
PD
Power Dissipation
Tstg
TL
Storage Temperature
Lead Temperature (10 sec)
± 50
mA
500 (*)
mW
-65 to +150
300
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: ≅ 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Supply Voltage
VI
Input Voltage
VO
Top
Output Voltage
Operating Temperature: M54HC Series
M74HC Series
Input Rise and Fall Time
tr, tf
VCC = 2 V
Value
2 to 6
Unit
V
0 to VCC
V
0 to VCC
-55 to +125
-40 to +85
0 to 1000
V
C
o
C
ns
VCC = 4.5 V
0 to 500
VCC = 6 V
0 to 400
o
3/11
M54/M74HC148
DC SPECIFICATIONS
Test Conditions
Symbol
VIH
V IL
V OH
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level
Output Voltage
II
ICC
4/11
Low Level Output
Voltage
Input Leakage
Current
Quiescent Supply
Current
TA = 25 C
54HC and 74HC
Min. Typ. Max.
VCC
(V)
-40 to 85 oC -55 to 125 oC
74HC
54HC
Min. Max. Min. Max.
2.0
1.5
1.5
1.5
4.5
6.0
3.15
4.2
3.15
4.2
3.15
4.2
2.0
0.5
0.5
0.5
1.35
1.35
1.35
6.0
1.8
1.8
1.8
2.0
4.5
6.0
6.0
2.0
Unit
V
4.5
4.5
VOL
Value
o
VI =
IO=-20 µA
VIH
or
V IL IO=-4.0 mA
1.9
2.0
1.9
1.9
4.4
5.9
4.5
6.0
4.4
5.9
4.4
5.9
4.18
4.31
4.13
4.10
IO=-5.2 mA
5.68
5.8
0.0
5.63
0.1
0.1
0.1
V
V
5.60
0.0
0.1
0.1
0.1
6.0
4.5
VI =
IO= 20 µA
VIH
or
V IL IO= 4.0 mA
0.0
0.17
0.1
0.26
0.1
0.33
0.1
0.40
6.0
IO= 5.2 mA
0.18
0.26
0.33
0.40
VI = VCC or GND
±0.1
±1
±1
µA
VI = VCC or GND
4
40
80
µA
4.5
6.0
6.0
V
M54/M74HC148
AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns)
Test Conditions
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)
CIN
CPD (*)
Value
o
VCC
(V)
TA = 25 C
54HC and 74HC
Min. Typ. Max.
-40 to 85 oC -55 to 125 oC
74HC
54HC
Min. Max. Min. Max.
2.0
30
75
95
110
4.5
6.0
8
7
15
13
19
16
22
19
2.0
60
150
190
225
4.5
19
30
38
45
6.0
16
26
32
38
2.0
60
150
190
225
4.5
6.0
19
16
30
26
38
32
45
38
2.0
40
115
145
175
4.5
6.0
14
12
23
20
29
25
35
30
Unit
ns
ns
ns
ns
2.0
40
115
145
175
4.5
6.0
14
12
23
20
29
25
35
30
2.0
40
115
145
175
4.5
6.0
14
12
23
20
29
25
35
30
ns
Input Capacitance
5
10
10
10
pF
Power Dissipation
Capacitance
60
ns
pF
(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN + ICC
SWITCHING CHARACTERISTICS TEST
CIRCUIT
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
5/11
M54/M74HC148
TYPICAL APPLICATION
4-BIT CASCADE CONNECTION
6/11
M54/M74HC148
Plastic DIP16 (0.25) MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
0.77
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
P001C
7/11
M54/M74HC148
Ceramic DIP16/1 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
20
0.787
B
7
0.276
D
E
3.3
0.130
0.38
e3
0.015
17.78
0.700
F
2.29
2.79
0.090
0.110
G
0.4
0.55
0.016
0.022
H
1.17
1.52
0.046
0.060
L
0.22
0.31
0.009
0.012
M
0.51
1.27
0.020
0.050
N
P
Q
10.3
7.8
8.05
5.08
0.406
0.307
0.317
0.200
P053D
8/11
M54/M74HC148
SO16 (Narrow) MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.004
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45° (typ.)
D
9.8
E
5.8
10
0.385
6.2
0.228
0.393
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8° (max.)
P013H
9/11
M54/M74HC148
PLCC20 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
9.78
10.03
0.385
0.395
B
8.89
9.04
0.350
0.356
D
4.2
4.57
0.165
0.180
d1
2.54
0.100
d2
0.56
0.022
E
7.37
8.38
0.290
0.330
e
1.27
0.050
e3
5.08
0.200
F
0.38
0.015
G
0.101
0.004
M
1.27
0.050
M1
1.14
0.045
P027A
10/11
M54/M74HC148
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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11/11