功能作用：74LS247 TTL BCD—7段4线15V输出译码器/驱动器
图1 74247内部逻辑及引脚图
图2 7段数码应用电路
74LS247 GUARANTEED OPERATING RANGES保证工作范围 ：
Symbol 符号
Parameter 参数 最小 典型 最大 单位 VCC Supply Voltage 电源电压4.75 5.0 5.25 V TA Operating Ambient Temperature Range 操作环境温度范围0 25 70 ℃ IOH Output Current–High BI/RBO 输出电流-BI/ RBO –50 μA IOL Output Current – Low BI/RBO 输出电流低BI/RBO 3.2 mA VO(off) Off–State Output Voltage 断态输出电压a – g 15 V IO(on) On–State Output Current a – g 通态输出电流 24 mADC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)直流特性工作温度范围（除非另有说明）：
Symbol 符号
Parameter 参数数值
单位 Test Conditions 测试条件最小典型最大VIH Input HIGH Voltage 输入高电平电压2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 输入低电平电压 0.8 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage 输入电压钳位二极管 –0.65 –1.5 V VCC = 最小, IIN = – 18mA VOH Output HIGH Voltage 输出高电平电压BI/RBO 2.4 4.2 V VCC = 最小, IOH = 最大, VIN = VIH or VIL per Truth Table VOL Output LOW Voltage 输出低电平电压 BI/RBO 0.25 0.4 V IOL=1.6mA VCC=VCC 最小, VIN=VIL or VIHVIN =VIL or VIH per Truth Table 0.35 0.5 V IOL=3.2mA IO(off) Off-State Output Current 断态输出电流a–g 250 μA VCC = 最大, VIH = 2.0V, VO(off) = 15V, VIL =最大 VO(on) On-State Output Voltage通态输出电流 a–g 0.25 0.4 V IO(on)=12mA VCC = 最小, VIH = 2.0V, VIL per Truth Table 0.35 0.5 V IO(on)=24mA IIH Input HIGH Current Input HIGH Current 输入高电平电流 20 μA VCC = 最大, VIN = 2.7V 0.1 mA VCC = 最大, VIN = 7.0V IIL Input LOW Current Any Input, except 输入低电平电流BI/RBO BI/RBO –0.4 mA VCC = 最大, VIN = 0.4V Ωμ –1.2 IOS Short Circuit Current BI/RBO (Note 1) 输出短路电流–0.3 –2.0 mA VCC = 最大 ICC Power Supply Current 电源电流 7.0 13 mA VCC = 最大AC CHARACTERISTICS (VCC=5.0V, TA=25℃)AC特性（Vcc=5.0V，TA=25℃ ）
Symbol 符号
Parameter 参数 参数
数值
单位 Test Conditions 测试条件最小典型最大tPLH Turn-Off Time from A Input 关断时间由A输入 100 nsCL = 15pFRL = 665Ω
tPHLTurn-On Time from A Input 开启时间从A输入 100tPHL Turn-Off Time from RBI Input 关断时间 100 tPLHTurn-On Time from RBI Input 开启时间 100FUNCTION TABLE真值表：
十进制OROR功能
INPUTS 输入BI/RBO OUTPUTS 输出NOTELT RBI D C B A a b c d e f g 1 0 H H L L L L H ON ON ON ON ON ON OFF 1 H X L L L H H OFF ON ON OFF OFF OFF OFF 2 H X L L H L H ON ON OFF ON ON OFF ON 3 H X L L H H H ON ON ON ON OFF OFF ON 4 H X L H L L H OFF ON ON OFF OFF ON ON 5 H X L H L H H ON OFF ON ON OFF ON ON 6 H X L H H L H ON OFF ON ON ON ON ON 7 H X L H H H H ON ON ON OFF OFF OFF OFF 8 H X H L L L H ON ON ON ON ON ON ON 9 H X H L L H H ON ON ON ON OFF ON ON 10 H X H L H L H OFF OFF OFF ON ON OFF ON 11 H X H L H H H OFF OFF ON ON OFF OFF ON 12 H X H H L L H OFF ON OFF OFF OFF ON ON 13 H X H H L H H ON OFF OFF ON OFF ON ON 14 H X H H H L H OFF OFF OFF ON ON ON ON 15 H X H H H H H OFF OFF OFF OFF OFF OFF OFF BI X X X X X X L OFF OFF OFF OFF OFF OFF OFF 2 RBI H L L L L L L OFF OFF OFF OFF OFF OFF OFF 3 LT L X X X X X H ON ON ON ON ON ON ON 4
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