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SN74LS194N

4-bit bidirectional universal shift register, LS TTL, PDIP-16

3500

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制造商零件：

SN74LS194N

包装：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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说明

产品概览

The SN74LS194N from Texas Instruments is a 4-bit bidirectional universal shift register with parallel load, serial shift left/right, and synchronous mode control in a 16-pin PDIP package.

主要规格

功能 4-bit bidirectional universal shift register
逻辑家族 LS (Low-power Schottky)
电源电压 4.75V to 5.25V
Modes Inhibit, Shift Right, Shift Left, Parallel Load
Mode Control S0 and S1 pins (2-bit select)
Serial Inputs SR SER (shift right), SL SER (shift left)
Parallel Inputs A, B, C, D
Outputs QA, QB, QC, QD
Clear Asynchronous, active LOW
Max Clock Frequency 25MHz typical
工作温度 0°C to +70°C
包装 PDIP-16 (19.3 x 6.35mm)

特点

  • Four operating modes: hold, shift right, shift left, parallel load
  • Synchronous mode selection via S0, S1
  • Dedicated serial inputs for left and right shift
  • Direct overriding clear
  • Cascadable for wider registers

应用

  • Serial-to-parallel and parallel-to-serial conversion
  • Arithmetic shift (multiply/divide by 2)
  • General-purpose data routing
  • Pseudo-random number generator

The SN74LS194N from Texas Instruments is a 4-bit bidirectional universal shift register that can perform four operations: hold (no change), shift right, shift left, and parallel load — all selected by the 2-bit mode control (S0, S1). On each rising clock edge, the selected operation is performed synchronously. Shift right: QA→QB→QC→QD, with the new QA loaded from SR SER. Shift left: QD→QC→QB→QA, with the new QD loaded from SL SER. Parallel load: A→QA, B→QB, C→QC, D→QD simultaneously. Hold: S0=S1=0, no change on any output. The asynchronous CLR input resets all outputs to 0 regardless of the clock. The 74194 is called ‘universal’ because it handles all common shift register operations in one IC. Two 74194s cascade to form an 8-bit register: QD of the first connects to SL SER of the second (for left shift), and QA of the second connects to SR SER of the first (for right shift). The N suffix denotes the PDIP-16 package.

The SN74LS194N has four D-type flip-flops (QA-QD) whose D inputs are connected to a 4:1 multiplexer controlled by S0 and S1. The multiplexer selects the source for each flip-flop: (1) S0=0, S1=0: each D input connects to its own Q output → HOLD (no change). (2) S0=1, S1=0: each D input connects to the previous stage → SHIFT RIGHT: QA←SR_SER, QB←QA, QC←QB, QD←QC. (3) S0=0, S1=1: each D input connects to the next stage → SHIFT LEFT: QD←SL_SER, QC←QD, QB←QC, QA←QB. (4) S0=1, S1=1: each D input connects to its parallel input → PARALLEL LOAD: QA←A, QB←B, QC←C, QD←D. All changes occur on the rising edge of CLK. The CLR input is asynchronous and overrides everything: when CLR=LOW, all Q outputs go LOW immediately. For serial-to-parallel conversion: feed serial data into SR SER, clock 4 times with S0=1,S1=0, then read QA-QD as parallel data. For parallel-to-serial: first parallel load (S0=S1=1), then shift right 4 times, reading QD each time.

针脚 名称 类型 说明
1 CLR 输入 Asynchronous clear (active LOW)
2 SR SER 输入 Serial shift-right input
3 A 输入 Parallel input A (QA)
4 B 输入 Parallel input B (QB)
5 C 输入 Parallel input C (QC)
6 D 输入 Parallel input D (QD)
7 S1 输入 Mode select 1 (with S0: 00=hold, 01=left, 10=right, 11=load)
8 接地 电源 地面
9 S0 输入 Mode select 0
10 SL SER 输入 Serial shift-left input
11 CLK 输入 Clock input (rising edge)
12 QD 输出 Register output D (MSB)
13 QC 输出 Register output C
14 QB 输出 Register output B
15 QA 输出 Register output A (LSB)
16 VCC 电源 Supply (5V)
  • Serial-to-Parallel: Serial data → SR SER; S0=1,S1=0; clock 4 times; read QA-QD as parallel output
  • Parallel-to-Serial: Data on A-D; S0=S1=1, clock once to load; then S0=1,S1=0, clock 4 times; read QD each clock for serial out
  • Multiply by 2: Parallel load number into QA-QD; then shift left once (S0=0,S1=1, clock); result = 2× original; shift left again = 4×
  • 8-Bit Register: Two 74194; QD(#1)→SL SER(#2); QA(#2)→SR SER(#1); shared CLK, S0, S1, CLR; 8-bit bidirectional shift
模型 制造商 主要区别 包装 Supply
74LS194N TI/Nexperia Original TTL version with 5V-only supply, typical propagation delay 10-15ns DIP-16 5V TTL
74LS194D TI/Nexperia Surface-mount SOIC version of LS with identical logic function SOIC-16 5V TTL
74HC194D TI/Nexperia CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity SOIC-16 2-6V CMOS
74HC194N TI/Nexperia Through-hole DIP version of HC family for prototyping and repair DIP-16 2-6V CMOS
74HCT194D TI/Nexperia CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V SOIC-16 4.5-5.5V TTL-in
74HCT194N TI/Nexperia Through-hole DIP version of HCT family for prototyping and repair DIP-16 4.5-5.5V TTL-in

The 74194 is a 4-Bit Bidirectional Universal Shift Register. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.

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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

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We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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