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SN54/74LS47 BCD TO 7-SEGMENT DECODER/DRIVER
The SN54 / 74LS47 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 decodingAND-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 theauxiliary inputs, are shown in the truth tables. Output configurations of the SN54 / 74LS47 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. Displaypatterns for BCD input counts above nine are unique symbols to authenticate input conditions. The SN54 / 74LS47 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 varyingthe frequency and duty cycle of the BI input signal or to inhibit the outputs.

BCD TO 7-SEGMENT DECODER/ DRIVER
LOW POWER SCHOTTKY

J SUFFIX CERAMIC CASE 620-09
16 1

16 1

N SUFFIX PLASTIC CASE 648-08

• • • • •

Lamp Intensity Modulation Capability (BI/RBO) Open Collector Outputs Lamp Test Provision Leading / Trailing Zero Suppression Input Clamp Diodes Limit High-SpeedTermination Effects CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 f 15 g 14 a 13 b 12 c 11 d 10 e 9

16 1

D SUFFIX SOIC CASE 751B-03

ORDERING INFORMATION
SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC

LOGIC SYMBOL
7 1 2 6 3 5 1 B 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 2 C 3 4 5 6 D 7 A HIGH0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 1.2 U.L. Open-Collector 8 GND LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.75 U.L. 2.0 U.L. 15 (7.5) U.L. A B C D LT RBI BI/ f g RBO

LT BI / RBO RBI

LOADING (Note a) a b c d e

13 12 11 10 9 15 14 4 VCC = PIN 16 GND = PIN 8

NOTES: a) 1 Unit Load (U.L.) = 40 µA HIGH, 1.6 mA LOW. b) Output current measured at VOUT = 0.5 V The Output LOW drive factor is 7.5 U.L.for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges.

FAST AND LS TTL DATA 5-1

SN54/74LS47
LOGIC DIAGRAM
a A b B INPUT C D d BLANKING INPUT OR RIPPLE-BLANKING OUTPUT d c c OUTPUT b a

e

e

f LAMP-TEST INPUT RIPPLE-BLANKING INPUT

f

g

g

0

1

2

3

4

5

6

7

8

9

10

11 12

13

14

15

NUMERICAL DESIGNATIONS — RESULTANTDISPLAYS TRUTH TABLE
INPUTS DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT OUTPUTS

LT H H H H H H H H H H H H H H H H X H L

RBI H X X X X X X X X X X X X X X X X L X

D L L L L L L L L H H H H H H H H X L X

C L L L L H H H H L L L L H H H H X L X

B L L H H L L H H L L H H L L H H X L X

A L H L H L H L H L H L H L H L H X L X

BI/RBO H H H H H H H H H H H H H HH H L L H

a L H L L H L H L L L H H H L H H H H L

b L L L L L H H L L L H H L H H H H H L

c L L H L L L L L L L H L H H H H H H L

d L H L L H L L H L H L L H L L H H H L

e L H L H H H L H L H L H H H L H H H L

f L H H H L L L H L L H H L L L H H H L

g H H L L L L L H L L L L L L L H H H L

NOTE A A

B C D

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial...