SN54/74LS247 thru SN54/74LS249 BCD-to-Seven-Segment Decoder/Drivers. L
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BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
SN54/74LS247 thru SN54/74LS249 BCD-to-Seven-Segment Decoder/Drivers. LS247 LS248 functionally electrically identical LS47 LS48 with same pinout configuration. LS249 16-pin version 14-pin LS49 includes full functional capability lamp test ripple blanking which available LS49. composition characters, except identical between LS247, 248, LS47, LS47 thru compose without tails, LS247 thru compose with tails. LS247 active-low outputs direct drive indicators. LS248 have active-high outputs driving lamp buffers. types feature lamp test input have full ripple-blanking input/output controls. types automatic leading and/or trailing-edge zero-blanking control (RBI RBO) incorporated overriding blanking input (BI) contained which used control lamp intensity pulsing inhibit output's lamp test performed time when BI/RBO node high level. Segment identification resultant displays shown below. Display pattern input counts above unique symbols authenticate input conditions. LS247
SN54/74LS247 SN54/74LS248 SN54/74LS249
BCD-TO-SEVEN-SEGMENT DECODERS/ DRIVERS
POWER SCHOTTKY
SUFFIX CERAMIC CASE 620-09
SUFFIX PLASTIC CASE 648-08
Open-Collector Outputs Drive Indicators Directly Lamp-Test Provision Leading Trailing Zero Suppression
LS248 Internal Pull-Ups Eliminate Need External Resistors Lamp-Test Provision Leading Trailing Zero Suppression LS249 Open-Collector Outputs Lamp-Test Provision Leading Trailing Zero Suppression
SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC
NUMERICAL DESIGNATIONS RESULTANT DISPLAYS
SEGMENT IDENTIFICATION
FAST DATA
SN54/74LS247 SN54/74LS248 SN54/74LS249
SN54 74LS248 SN54 74LS259 (TOP VIEW)
OUTPUTS
SN54 74LS247 (TOP VIEW)
OUTPUTS
RBORBI
RBORBI
INPUTS
LAMP TEST
INPUTS
INPUTS
LAMP TEST
INPUTS
CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY
DRIVER OUTPUTS TYPE SN54LS247 SN54LS248 SN54LS249 SN74LS247 SN74LS248 SN74LS249 ACTIVE LEVEL high high high high OUTPUT CONFIGURATION open-collector pull-up open-collector open-collector pull-up open-collector SINK CURRENT VOLTAGE TYPICAL POWER DISSIPATION
LOGIC DIAGRAM LS247
(13) INPUT INPUT INPUT INPUT BI/RBO BLANKING INPUT RIPPLE-BLANKING OUTPUT (14) (12) OUTPUT INPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT LAMP TEST INPUT (14) INPUT INPUT INPUT BLANKING INPUT RIPPLE-BLANKING OUTPUT (12)
LS248, LS249
(13)
OUTPUT
OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT
(11)
(11)
(10)
(10)
(15)
(15)
LAMP TEST INPUT RIPPLE-BLANKING INPUT
RIPPLE-BLANKING INPUT
FAST DATA
SN54/74LS247 SN54/74LS248 SN54/74LS249
LS247 FUNCTION TABLE
DECIMAL FUNCTION INPUTS BI/RBO OUTPUTS NOTE
LS248, LS249 FUNCTION TABLE
DECIMAL FUNCTION INPUTS BI/RBO OUTPUTS NOTE
HIGH Level, Level, Irrelevant NOTES: blanking input (BI) must open held high logic level when output functions through desired. ripple-blanking input (RBI) must NOTES: open high blanking decimal zero desired. When logic level applied directly blanking input (BI), segment outputs regardless level other input. When ripple-blanking input (RBI) inputs level with lamp test input high, segment outputs NOTES: ripple-blanking output (RBO) goes level (response condition). When blanking input/ripple blanking output (BI/RBO) open held high applied lamp-test input, segment outputs BI/RBO wire-AND logic serving blanking input (BI) and/or ripple-blanking output (RBO).
FAST DATA
SN54/74LS247
GUARANTEED OPERATING RANGES
Symbol VO(off) IO(on) Supply Voltage Operating Ambient Temperature Range Output Current High Output Current Off-State Output Voltage On-State Output Current On-State Output Current Parameter 4.75 5.25 Unit
CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol Parameter Input HIGH Voltage Input Voltage Input Clamp Diode Voltage Output HIGH Voltage Output Voltage Off-State Output Current On-State Output Voltage Input HIGH Current Input Current Input, except Short Circuit Current (Note Power Supply Current 0.25 0.35 0.65 0.25 0.35 Unit Test Conditions Guaranteed Input HIGH Voltage Inputs Guaranteed Input Voltage Inputs MIN, MIN, MAX, Truth Table MIN, Truth Table
IO(off) VO(on)
MAX, VO(off) IO(on) IO(on) MIN, Truth Table
MAX, MAX, MAX,
Note more than output should shorted time, more than second.
CHARACTERISTICS (VCC 25°C)
Limits Symbol tPLH tPHL tPHL tPLH Parameter Turn-Off Time from Input Turn-On Time from Input Turn-Off Time from Input Turn-On Time from Input Unit Test Conditions
FAST DATA
SN54/74LS248
GUARANTEED OPERATING RANGES
Symbol Supply Voltage Operating Ambient Temperature Range Output Current High Output Current High Parameter 4.75 5.25 Unit
Output Current Output Current Output Current Output Current
CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol Parameter Input HIGH Voltage Input Voltage Input Clamp Diode Voltage Output HIGH Voltage Output Current Output Voltage 0.65 Unit Test Conditions Guaranteed Input HIGH Voltage Inputs Guaranteed Input Voltage Inputs MIN, MIN, MAX, Truth Table MIN, 0.85 Input Conditions Input HIGH Current Input, except Input Current Input, except Short Circuit Current (Note Power Supply Current 0.35 MAX, MAX, MAX, MIN, Truth Table
0.25 0.35 0.25
Note more than output should shorted time, more than second.
CHARACTERISTICS (VCC 25°C)
Limits Symbol tPLH tPHL tPHL tPLH Parameter Propagation Delay Time, High-to-Low-Level Output from Input Propagation Delay Time, Low-to-High-Level Output from Input Propagation Delay Time, High-to-Low-Level Output from Input Propagation Delay Time, Low-to-High-Level Output from Input Unit Test Conditions
FAST DATA
SN54/74LS249
GUARANTEED OPERATING RANGES
Symbol Supply Voltage Operating Ambient Temperature Range Output Current High Output Current Output Current Output Voltage High Output Current Output Current Parameter 4.75 5.25 Unit
CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol Parameter Input HIGH Voltage Input Voltage Input Clamp Diode Voltage Output HIGH Voltage Output HIGH Current Output Voltage 0.65 Unit Test Conditions Guaranteed Input HIGH Voltage Inputs Guaranteed Input Voltage Inputs MIN, MIN, MAX, Truth Table MIN, Input HIGH Current Input, except Input Current Input, except Short Circuit Current (Note Power Supply Current 0.35 MAX, MAX, MAX, MIN, Truth Table
0.25 0.35 0.25
Note more than output should shorted time, more than second.
CHARACTERISTICS (VCC 25°C)
Limits Symbol tPHL tPLH tPHL tPLH Parameter Propagation Delay Time, High-to-Low-Level Output from Input Propagation Delay Time, Low-to-High-Level Output from Input Propagation Delay Time, High-to-Low-Level Output from Input Propagation Delay Time, Low-to-High-Level Output from Input Unit Test Conditions
FAST DATA
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