16-pin (D) package image

SN74ALS191ADR 現行

4 位元同步加/減二進位計數器

現行 custom-reels 客製 可提供客製捲盤

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定價

數量 價格
+

額外包裝數量 | 包裝類型選項 這些產品完全相同,但包裝類型不同

SN74ALS191AD 停產
包裝數量 | 運送業者 40 | TUBE
庫存
數量 | 價格 1ku | +

品質資訊

等級 Catalog
RoHS
REACH
引腳鍍層 / 焊球材質 NIPDAU
MSL 等級 / 迴焊峰值 Level-1-260C-UNLIM
品質、可靠性
及包裝資訊

內含資訊:

  • RoHS
  • REACH
  • 產品標記
  • 引腳鍍層 / 焊球材質
  • MSL 等級 / 迴焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中的可靠性監測
檢視或下載
其他製造資訊

內含資訊:

  • 晶圓廠位置
  • 組裝地點
檢視

出口分類

*僅供參考

  • 美國 ECCN:EAR99

更多SN74ALS191A資訊

封裝資訊

封裝 | 針腳 SOIC (D) | 16
操作溫度範圍 (°C) 0 to 70
包裝數量 | 運送業者 2,500 | LARGE T&R

SN74ALS191A 的特色

  • Single Down/Up Count-Control Line
  • Look-Ahead Circuitry Enhances Speed of Cascaded Counters
  • Fully Synchronous in Count Modes
  • Asynchronously Presettable With Load Control
  • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

SN74ALS191A 的說明

The 'ALS191A are synchronous 4-bit reversible up/down binary counters. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidentally with each other when instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple-clock) counters.

The outputs of the four flip-flops are triggered on a low-to-high-level transition of the clock (CLK) input if the count enable () input is low. A high at inhibits counting. The direction of the count is determined by the level of the down/up (D/U\) input. When D/U\ is low, the counter counts up, and when D/U\ is high, the counter counts down.

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

These counters are fully programmable. Each output can be preset to either level by placing a low on the input and entering the desired data at the data inputs. The output changes to agree with the data inputs independently of the level of the clock input. This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

CLK, D/U\, and are buffered to lower the drive requirement, which significantly reduces the loading on (current required by) clock drivers, for long parallel words.

Two outputs are available to perform the cascading function: ripple clock and maximum/minimum count. The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock while the count is minimum (0) counting down or maximum (15) counting up. The ripple-clock output () produces a low-level output pulse under those same conditions, but only while the clock input is low. The counter easily can be cascaded by feeding the ripple-clock output to the enable input of the succeeding counter if parallel clocking is used, or to the clock input if parallel enabling is used. The maximum/minimum count (MAX/MIN) output can be used to accomplish look ahead for high-speed operation.

The SN54ALS191A is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS191A is characterized for operation from 0°C to 70°C.

定價

數量 價格
+

額外包裝數量 | 包裝類型選項 這些產品完全相同,但包裝類型不同

SN74ALS191AD 停產
包裝數量 | 運送業者 40 | TUBE
庫存
數量 | 價格 1ku | +

包裝類型選項

您可依零件數量選擇不同包裝類型選項,包含完整捲盤、客製化捲盤、剪切捲帶、承載管或盤。

客製化捲盤是從一個捲盤上剪切下來的連續剪切捲帶,以維持批次和日期代碼可追溯性,依要求剪切至確切數量。依照業界標準,銅墊片會在剪切捲帶兩側連接 18 英吋前後導帶,以直接送至自動組裝機器。針對客製化捲盤訂單,TI 將酌收捲帶封裝費用。

剪切捲帶是從捲盤剪切下來的一段捲帶。TI 可能使用多條剪切捲帶或承載盒,以滿足訂單要求數量。

TI 常以盒裝或管裝、盤裝方式運送承載管裝置,視現有庫存而定。所有捲帶、管或樣本盒之封裝,皆符合公司內部靜電放電與防潮保護包裝要求。

進一步了解

可提供批次和日期代碼選擇

在購物車中加入數量,並開始結帳流程以檢視可用選項,從現有庫存中選擇批次或日期代碼。

進一步了解