SN54ALS169B_TI 同步 4 位加/减二进制计数器

SN54ALS169B的基本参数

制造厂商：TI
产品类别：逻辑和电压转换
技术类目：触发器、锁存器和寄存器 - 计数器
功能描述：同步 4 位加/减二进制计数器
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SN54ALS169B的产品详情：

These synchronous 4-bit up/down binary presettable counters feature an internal carry look-ahead circuitry for cascading in high-speed counting applications. 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 normally associated with asynchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.

These counters are fully programmable; that is, they may be preset to either level. The load-input circuitry allows loading with the carry-enable output of cascaded counters. Because loading is synchronous, setting up a low level at the load (LOAD\) input disables the counter and causes the outputs to agree with the data inputs after the next clock pulse.

The internal carry look-ahead circuitry provides for cascading counters for n-bit synchronous application without additional gating. and inputs and a ripple-carry output () are instrumental in accomplishing this function. Both and must be low to count. The direction of the count is determined by the level of the up/down (U/D\) input. When U/D\ is high, the counter counts up; when low, it counts down. is fed forward to enable . , thus enabled, produces a low-level pulse while the count is zero (all inputs low) counting down or maximum (15) counting up. This low-level overflow ripple-carry pulse can be used to enable successive cascaded stages. Transitions at or are allowed regardless of the level of the clock input. All inputs are diode clamped to minimize transmission-line effects, thereby simplifying system design.

These counters feature a fully independent clock circuit. Changes at control inputs (, , , or U/D\) that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the stable setup and hold times.

The SN54ALS169B and SN54AS169A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS169B and SN74AS169A are characterized for operation from 0°C to 70°C.

SN54ALS169B的优势和特性：

Fully Synchronous Operation for Counting and Programming
Internal Carry Look-Ahead Circuitry for Fast Counting
Carry Output for n-Bit Cascading
Fully Independent Clock Circuit
Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

SN54ALS169B的参数（英文）：

Function
Counter
Bits (#)
4
Technology Family
ALS
Supply voltage (Min) (V)
4.5
Supply voltage (Max) (V)
5.5
Input type
Bipolar
Output type
Push-Pull
Features
High speed (tpd 10-50ns)

SN54ALS169B具体的完整产品型号参数及价格（美元）：

SN54ALS169B的完整型号有：8302501EA、JM38510/38003BEA、M38510/38003BEA、SN54ALS169BJ、SNJ54ALS169BJ，以下是这些产品的关键参数及官网采购报价：

8302501EA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网8302501EA的批量USD价格：10.33（1000+）

JM38510/38003BEA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网JM38510/38003BEA的批量USD价格：22.256（1000+）

M38510/38003BEA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网M38510/38003BEA的批量USD价格：22.256（1000+）

SN54ALS169BJ，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SN54ALS169BJ的批量USD价格：7.565（1000+）

SNJ54ALS169BJ，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SNJ54ALS169BJ的批量USD价格：10.33（1000+）

SN54ALS169B的评估套件：

SN54ALS169B的电路图解：

SN54ALS169B的评估套件：