- 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：十进制计数器
- 点击这里打开及下载SN74LS90的技术文档资料
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Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the '90A and 'LS90, divide-by-six for the '92A and 'LS92, and the divide-by eight for the '93A and 'LS93.
All of these counters have a gated zero reset and the '90A and 'LS90 also have gated set-to-nine inputs for use in BCD nine's complement applications.
To use their maximum count length (decade, divide-by-twelve, or four-bit binary) of these counters, the CKB input is connected to the QA output. The input count pulses are applied to CKA input and the outputs are as described in the appropriate function table. A symmetrical divide-by-ten count can be obtained from the '90A or 'LS90 counters by connecting the QD output to the CKA input and applying the input count to the CKB input which gives a divide-by-ten square wave at output QA.
- '90A, 'LS90 . . . Decade Counters
- '92A, 'LS92 . . . Divide By-Twelve Counters
- '93A, 'LS93 . . . 4-Bit Binary Counters
- Function
- Counter
- Bits (#)
- 4
- Technology Family
- LS
- Supply voltage (Min) (V)
- 4.75
- Supply voltage (Max) (V)
- 5.25
- Input type
- Bipolar
- Output type
- Push-Pull
- Features
- High speed (tpd 10-50ns)
SN74LS90的完整型号有：SN74LS90D、SN74LS90DR、SN74LS90N，以下是这些产品的关键参数及官网采购报价：
SN74LS90D，工作温度：0 to 70，封装：SOIC (D)-14，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS90D的批量USD价格：.962（1000+）
SN74LS90DR，工作温度：0 to 70，封装：SOIC (D)-14，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS90DR的批量USD价格：.802（1000+）
SN74LS90N，工作温度：0 to 70，封装：PDIP (N)-14，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS90N的批量USD价格：.922（1000+）
14-24-LOGIC-EVM — 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM
该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。
