74HC/HCT160是同步可预设十进制计数器，具有内部前视进位且可用于高速计数。
The AiP74HC/HCT160 is a synchronous presettable decade counter with an internal look-ahead carry.Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset HIGH or LOW. A LOW at the parallel enable input (P¯E¯) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock. Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW at the master reset input (M¯R¯) sets Q0 to Q3 LOW regardless of the levels at input pins CP, P¯E¯, CET and CEP (thus providing an asynchronous clear function). The look-ahead carry simplifies serial cascading of the counters. Both CEP and CET must be
HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH output of Q0. This pulse can be used to enable the next cascaded stage. The maximum clock frequency for the cascaded counters is determined by the CP to TC propagation delay and CEP to CP set-up time, according to the following formula:
fmax=1/(tP(max)(CP to TC)+tSU(CEP to CP))
Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to
voltages in excess of VCC.
其紧张特点如下：
● Input levels:
For AiP74HC160: CMOS level
For AiP74HCT160: TTL level
● Synchronous counting and loading
● 2 count enable inputs for n-bit cascading
● Asynchronous reset
● Positive-edge triggered clock
● Specified from -40℃ to +105℃
● Packaging information: DIP16/SOP16/TSSOP16
根本参数
逻辑电路的归属系列: 74HC
逻辑类型: 计数器，十进制
方向: 上
元件数: 1
单元件位数: 4
复位办法: 异步
定时办法: 同步
计数速率: 66MHz
触发器类型: 正边沿
电源电压: 2V~6V
静态电流(最大值): 8uA
不同 V,最大 CL 时的最大传播延迟: 31ns@6V,50pF
低电平输出电流(IOL): 5.2mA
高电平输出电流(IOH): 5.2mA
逻辑电平-高: 1.5V~4.2V
逻辑电平-低: 0.5V~1.8V
事情温度: -40℃~+105℃
尺寸最大值
互换参数
图1
图2
功能框图逻辑符号
IEC 逻辑符号
功能框图
逻辑框图
状态机图
时序序列图
参考报价深圳市灵星芯微电子科技有限公司以低本高质的做事精神耸立于电子行业20多年
