产品描述:
HC221和CD74HCT221是带重置的双单稳多谐振荡器。外部电阻(RBX)和外部电容器(CBX)控制电路的定时和精度。调整R和C提供来自Q和Q端子的宽范围输出脉冲宽度。B输入上的脉冲触发发生在特定的电压电平,与触发脉冲的上升和下降时间无关。
一旦触发,输出将独立于A和B上的其他触发输入。输出脉冲可通过RESET(R)引脚上的低电平终止。提供上升沿触发(A)和前沿触发(B)输入,用于从输入脉冲的任何一个沿触发。上电时,IC会被重置。如果未使用任何一个单声道,则必须将每个输入(在未使用的设备上)终止为高电平或低电平。外部电阻的最小值RX通常为500.外部电容的最小值CX为0pF。在VCC=4.5V时,脉冲宽度的计算为tW>=0.7RX>CX>。
产品特性:
- Overriding RESET Terminates Output Pulse
- Triggering from the Leading or Trailing Edge
- Q and Q\ Buffered Outputs
- Separate Resets
- Wide Range of Output-Pulse Widths
- Schmitt Trigger on B Inputs
- Fanout (Over Temperature Range)
- Standard Outputs . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . 15 LSTTL Loads
- Wide Operating Temperature Range . . . –55°C to 125°C
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
- HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH
Data sheet acquired from Harris Semiconductor
通道数量2
供电电压(Min)(V)4.5
供电电压(Max)(V)5.5
技术系列HCT
输入类型TTL-CompatibleCMOS
输出类型推挽式
供应电流(µA)80
有效输入电压(Max)(毫安)4
IOH(Max)(毫安)-4
特性Balancedoutputs,Highspeed(tpd10-50ns),Positiveinputclampdiode