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  ON Semiconductor Electronic Components Datasheet  

SN74LS47 Datasheet

BCD to 7-Segment Decoder/Driver

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SN74LS47
BCD to 7-Segment
Decoder/Driver
The SN74LS47 are Low Power Schottky BCD to 7-Segment
Decoder/ Drivers consisting of NAND gates, input buffers and seven
AND-OR-INVERT gates. They offer active LOW, high sink current
outputs for driving indicators directly. Seven NAND gates and one
driver are connected in pairs to make BCD data and its complement
available to the seven decoding AND-OR-INVERT gates. The
remaining NAND gate and three input buffers provide lamp test,
blanking input / ripple-blanking output and ripple-blanking input.
The circuits accept 4-bit binary-coded-decimal (BCD) and,
depending on the state of the auxiliary inputs, decodes this data to
drive a 7-segment display indicator. The relative positive-logic output
levels, as well as conditions required at the auxiliary inputs, are shown
in the truth tables. Output configurations of the SN74LS47 are
designed to withstand the relatively high voltages required for
7-segment indicators.
These outputs will withstand 15 V with a maximum reverse current
of 250 µA. Indicator segments requiring up to 24 mA of current may
be driven directly from the SN74LS47 high performance output
transistors. Display patterns for BCD input counts above nine are
unique symbols to authenticate input conditions.
The SN74LS47 incorporates automatic leading and / or trailing-edge
zero-blanking control (RBI and RBO). Lamp test (LT) may be
performed at any time which the BI / RBO node is a HIGH level. This
device also contains an overriding blanking input (BI) which can be
used to control the lamp intensity by varying the frequency and duty
cycle of the BI input signal or to inhibit the outputs.
Lamp Intensity Modulation Capability (BI/RBO)
Open Collector Outputs
Lamp Test Provision
Leading/ Trailing Zero Suppression
Input Clamp Diodes Limit High-Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current – High
BI/RBO
– 50 mA
IOL Output Current – Low
BI/RBO
BI/RBO
3.2 mA
VO(off)
Off–State Output Voltage
a to g
15 V
IO(on)
On–State Output Current
a to g
24 mA
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS47N
16 Pin DIP
2000 Units/Box
SN74LS47D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS47/D


  ON Semiconductor Electronic Components Datasheet  

SN74LS47 Datasheet

BCD to 7-Segment Decoder/Driver

No Preview Available !

SN74LS47
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC f g a b c d e
16 15 14 13 12 11 10 9
1 2 3 4 56
B C LT BI / RBO RBI D
78
A GND
PIN NAMES
A, B, C, D
RBI
LT
BI/RBO
a, to g
BCD Inputs
Ripple–Blanking Input
Lamp–Test Input
Blanking Input or
Ripple–Blanking Output
Outputs
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
1.2 U.L.
Open–Collector
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.75 U.L.
2.0 U.L.
15 U.L.
NOTES:
a) 1 Unit Load (U.L.) = 40 mA HIGH, 1.6 mA LOW.
b) Output current measured at VOUT = 0.5 V
b) The Output LOW drive factor is 15 U.L. for Commercial (74) Temperature Ranges.
LOGIC SYMBOL
71 2 63 5
A B C D LT RBI
BI/
a b c d e f g RBO
13 12 11 10 9 15 14 4
VCC = PIN 16
GND = PIN 8
http://onsemi.com
2


Part Number SN74LS47
Description BCD to 7-Segment Decoder/Driver
Maker ON Semiconductor
Total Page 8 Pages
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