74LS247中文资料和74LS247引脚图及功能

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 mA

DC 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 = 15pF

RL = 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　　100

FUNCTION 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