CD54HC147, CD74HC147,
CD74HCT147
Data sheet acquired from Harris Semiconductor
SCHS149F
High-Speed CMOS Logic
September 1997 - Revised November 2003
10- to 4-Line Priority Encoder
provide binary representation on the four active LOW inputs
(Y0 to Y3). A priority is assigned to each input so that when
two or more inputs are simultaneously active, the input with
the highest priority is represented on the output, with input
Features
[ /Title
(CD74
HC147
,
CD74
HCT14
7)
• Buffered Inputs and Outputs
• Typical Propagation Delay: 13ns at V
o
= 5V,
CC
line l having the highest priority.
9
C = 15pF, T = 25 C
L
A
These devices provide the 10-line to 4-line priority encoding
function by use of the implied decimal “zero”. The “zero” is
encoded when all nine data inputs are HIGH, forcing all four
outputs HIGH.
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C
• Balanced Propagation Delay and Transition Times
/Sub-
ject
Ordering Information
(High
Speed
CMOS
Logic
10-to-4
Line
Prior-
ity
Encode
r)
TEMP. RANGE
o
• Significant Power Reduction Compared to LSTTL
Logic ICs
PART NUMBER
CD54HC147F3A
CD74HC147E
( C)
PACKAGE
16 Ld CERDIP
16 Ld PDIP
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N = 30%, N = 30% of V
IL IH CC
CD74HC147M
16 Ld SOIC
16 Ld SOIC
16 Ld SOIC
16 Ld SOP
at V
= 5V
CC
CD74HC147MT
CD74HC147M96
CD74HC147NSR
CD74HC147PW
CD74HC147PWR
CD74HC147PWT
CD74HCT147E
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V = 0.8V (Max), V = 2V (Min)
IL IH
- CMOS Input Compatibility, I ≤ 1µA at V , V
OL OH
16 Ld TSSOP
16 Ld TSSOP
16 Ld TSSOP
16 Ld PDIP
l
/Autho
r ()
Description
/Key-
words
(High
Speed
CMOS
Logic
10-to-4
Line
The ’HC147 and CD74HCT147 are high speed silicon-gate
CMOS devices and are pin-compatible with low power
Schottky TTL (LSTTL).
NOTE: When ordering, use the entire part number. The suffixes
96 and R denote tape and reel. The suffix T denotes a
small-quantity reel of 250.
The ’HC147 and CD74HCT147 9-input priority encoders
accept data from nine active LOW inputs (l to l ) and
1
9
Pinout
Prior-
ity
CD54HC147 (CERDIP)
CD74HC147 (PDIP, SOIC, SOP, TSSOP)
CD74HCT147 (PDIP, TSSOP)
TOP VIEW
Encode
r, High
Speed
CMOS
Logic
10-to-4
Line
I4
I5
1
2
3
4
5
6
7
8
16 V
CC
15 NC
14 Y3
13 I3
12 I2
11 I1
10 I9
I6
I7
I8
Y2
Y1
GND
Prior-
ity
9
Y0
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
1