74LVC169集成電路（IC）的計(jì)數(shù)器除法器規(guī)格書PDF中文資料

General description

The 74LVC169 is a synchronous presettable 4-bit binary counter which features an internal look-ahead carry circuitry for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs (pins Q0 to Q3) change simultaneously with each other when so instructed by the count-enable (pins CEP and CET) inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple clock) counters. A buffered clock (pin CP) input triggers the four flip-flops on the LOW-to-HIGH transition of the clock.

Features and benefits

■ 5 V tolerant inputs for interfacing with 5 V logic

■ Wide supply voltage range from 1.2 V to 3.6 V

■ CMOS low power consumption

■ Direct interface with TTL levels

■ Up/down counting

■ Two count enable inputs for n-bit cascading

■ Built-in look-ahead carry capability

■ Presettable for programmable operation

■ Complies with JEDEC standard:

◆ JESD8-7A (1.65 V to 1.95 V)

◆ JESD8-5A (2.3 V to 2.7 V)

◆ JESD8-C/JESD36 (2.7 V to 3.6 V)

■ ESD protection:

◆ HBM JESD22-A114F exceeds 2000 V

◆ MM JESD22-A115-B exceeds 200 V

◆ CDM JESD22-C101E exceeds 1000 V

■ Multiple package options

■ Specified from -40 °C to +85 °C and from -40 °C to +125 °C