CD74HC147 Datasheet, PDF (1/6 Pages) Texas Instruments – High Speed CMOS Logic 10-to-4 Line Priority Encoder

Data sheet acquired from Harris Semiconductor
SCHS149
September 1997
CD74HC147,
CD74HCT147
High Speed CMOS Logic
10-to-4 Line Priority Encoder
[ /Title
(CD74
HC147
,
CD74
HCT14
7)
/Sub-
ject
(High
Speed
CMOS
Logic
10-to-4
Line
Prior-
ity
Encode
r)
/Autho
r ()
/Key-
words
(High
Speed
CMOS
Logic
10-to-4
Line
Prior-
ity
Encode
r, High
Speed
CMOS
Logic
10-to-4
Line
Prior-
ity
Features
Description
• Buffered Inputs and Outputs
•
Typical Propagation Delay:
C_L = 15pF, T_A = 25^oC
13ns
at
V_CC
=
5V,
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l ≤ 1µA at V_OL, V_OH
The Harris CD74HC147and CD74HCT147 are high speed
silicon-gate CMOS devices and are pin-compatible with low
power Schottky TTL (LSTTL).
The CD74HC147 and CD74HCT147 9-input priority
encoders accept data from nine active LOW inputs (l₁ to l₉)
and 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 line l₉ having the highest priority.
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.
Ordering Information
PART NUMBER TEMP. RANGE (^oC) PACKAGE
PKG.
NO.
CD74HC147E
-55 to 125
16 Ld PDIP E16.3
CD74HCT147E
-55 to 125
16 Ld PDIP E16.3
CD74HC147M
-55 to 125
16 Ld SOIC M16.15
CD74HCT147M
-55 to 125
16 Ld SOIC M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer or die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or
Harris customer service for ordering information.
Pinout
CD74HC147, CD74HCT147
(PDIP, SOIC)
TOP VIEW
I4 1
I5 2
I6 3
I7 4
I8 5
Y2 6
Y1 7
GND 8
16 V_CC
15 NC
14 Y3
13 I3
12 I2
11 I1
10 I9
9 Y0
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
1
File Number 1773.1