同步4位二进制计数器 Synchronous 4-Bit Binary Counters
General Description
These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The DM74LS161A and DM74LS163A are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation eliminates the output counting
spikes which are normally associated with asynchronous ripple clock counters. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform.
Features
■Synchronously programmable
■Internal look-ahead for fast counting
■Carry output for n-bit cascading
■Synchronous counting
■Load control line
■Diode-clamped inputs
■Typical propagation time, clock to Q output 14 ns
■Typical clock frequency 32 MHz
■Typical power dissipation 93 mW
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
DM74LS161AM Fairchild 飞兆/仙童 | 当前型号 | 当前型号 |
SN74LS161AD 德州仪器 | 类似代替 | DM74LS161AM和SN74LS161AD的区别 |
SN74LS161AN 德州仪器 | 类似代替 | DM74LS161AM和SN74LS161AN的区别 |
SN74LS161ANSR 德州仪器 | 类似代替 | DM74LS161AM和SN74LS161ANSR的区别 |