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SN74LS164N

8-bit serial-in parallel-out shift register, LS TTL, PDIP-14

5000

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制造商零件：

SN74LS164N

包装：

PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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说明

产品概览

The SN74LS164N from Texas Instruments is an 8-bit serial-in parallel-out shift register — the TTL equivalent of the CD4094, ideal for expanding microcontroller outputs from 2 pins to 8 in a 14-pin PDIP package.

主要规格

功能 8-bit serial-in parallel-out shift register
逻辑家族 LS (Low-power Schottky)
电源电压 4.75V to 5.25V
Serial Inputs A and B (both must be HIGH to shift in 1)
Outputs Q0-Q7 (8 parallel outputs)
Clear Asynchronous, active-LOW (CLR)
Trigger Positive edge on CLK
Max Clock Frequency 25MHz typical
工作温度 0°C to +70°C
包装 PDIP-14 (19.3 x 6.35mm)

特点

  • 8-bit serial-to-parallel conversion
  • Gated serial inputs (A AND B both HIGH = shift in 1)
  • Asynchronous clear (CLR, active-LOW)
  • Cascadable (Q7 → next A input)
  • 25MHz clock rate

应用

  • GPIO expansion (2 pins → 8 outputs)
  • LED chaser / display driver
  • Serial-to-parallel data conversion
  • Multi-chip display multiplexing

The SN74LS164N from Texas Instruments is an 8-bit serial-in parallel-out shift register. Data is shifted in serially through the A and B gated inputs on each rising clock edge, and appears as 8 parallel outputs (Q0-Q7) after 8 clock cycles. The two serial inputs (A and B) are ANDed internally: a 1 is shifted in only when both A AND B are HIGH. This gating feature allows one input to serve as an active-HIGH enable while the other carries data — if either is LOW, a 0 is shifted in. The asynchronous clear (CLR=LOW) immediately resets all outputs to 0. For cascading, Q7 of one 74164 connects to the A input of the next; 2 chips give 16 outputs from 2 MCU pins (DATA + CLK). Unlike the 74HC595 which has an output latch and 3-state outputs, the 74164’s outputs update immediately as data shifts through — each output toggles as the shift register fills, which can cause flicker in display applications. The 74164 is simpler and cheaper than the 595, making it ideal for LED chasers and non-critical output expansion. The N suffix denotes the PDIP-14 through-hole package.

The SN74LS164N shifts data on each rising clock edge. The data shifted in is the AND of inputs A and B: if both are HIGH, a 1 enters; if either is LOW, a 0 enters. On each rising CLK edge: Q0 takes the value of (A AND B); Q1 takes the old value of Q0; Q2 takes old Q1; … Q7 takes old Q6. After 8 clock cycles, 8 bits of serial data have been converted to 8 parallel outputs. The clear input (CLR=LOW) asynchronously forces all Q0-Q7 to 0 regardless of CLK. For normal operation, CLR must be HIGH. The gated inputs allow: A=data, B=enable (or vice versa); data is shifted in only when enable is HIGH; when enable is LOW, zeros are shifted in regardless of A. For cascading: Q7 → A of next 74164; B of all chips tied HIGH; shared CLK; shared CLR; 2 chips = 16 outputs, 3 chips = 24 outputs, all from 2 MCU pins. Unlike the 74HC595, the 74164 has no output latch: outputs change as data shifts through, so LED displays may flicker during shifting. For static displays, use the 74HC595 instead.

针脚 名称 类型 说明
1 A 输入 Serial input A (gated with B)
2 B 输入 Serial input B (gated with A)
3 Q0 输出 Parallel output bit 0 (first shift stage)
4 Q1 输出 Parallel output bit 1
5 Q2 输出 Parallel output bit 2
6 Q3 输出 Parallel output bit 3
7 接地 电源 地面
8 CLK 输入 Clock (positive edge)
9 CLR 输入 Clear (active LOW, resets all outputs to 0)
10 Q4 输出 Parallel output bit 4
11 Q5 输出 Parallel output bit 5
12 Q6 输出 Parallel output bit 6
13 Q7 输出 Parallel output bit 7 (last stage, for cascading)
14 VCC 电源 Supply (5V)
  • LED Chaser: MCU: DATA → A; CLK → CLK; CLR → HIGH; shift pattern: 10000000 → 01000000 → 00100000 → etc.; Q0-Q7 drive 8 LEDs; chasing effect
  • 16-Output Expansion: Two 74164s; Q7(#1) → A(#2); shared CLK, B=HIGH, CLR=HIGH; 16 outputs from 2 MCU pins
  • 7-Segment Multiplex: 74164 shifts segment data; common anode displays driven sequentially; one digit at a time
  • Gated Input: A=serial data, B=enable; shift in data only when B=HIGH; shift in zeros when B=LOW; selective data entry
模型 制造商 主要区别 包装 Supply
74LS164N TI/Nexperia Original TTL version with 5V-only supply, typical propagation delay 10-15ns DIP-14 5V TTL
74LS164D TI/Nexperia Surface-mount SOIC version of LS with identical logic function SOIC-14 5V TTL
74HC164D TI/Nexperia CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity SOIC-14 2-6V CMOS
74HC164N TI/Nexperia Through-hole DIP version of HC family for prototyping and repair DIP-14 2-6V CMOS
74HCT164D TI/Nexperia CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V SOIC-14 4.5-5.5V TTL-in
74HCT164N TI/Nexperia Through-hole DIP version of HCT family for prototyping and repair DIP-14 4.5-5.5V TTL-in

The 74164 is a 8-Bit Parallel-Out Serial 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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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

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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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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