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SN74HC273NSR

Octal D-type flip-flop, edge-triggered, async clear, 28MHz, SOP-20

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Manufacturer Part：

SN74HC273NSR

Package：

SOP-20 (NS) (12.6×7.8 mm)

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Description

Product Overview

The Texas Instruments SN74HC273NSR is an octal positive-edge-triggered D-type flip-flop with an active-low clear input, packaged in a 20-pin SOP (NS). Each of the eight flip-flops has an individual data input and a single-rail output, sharing a common clock and asynchronous clear. With 2 V to 6 V operation and 12 ns typical propagation delay, it is designed for data storage, address latching, and register applications.

Key Specifications

Function Octal D-Type Flip-Flop with Clear
Channels 8
Trigger Type Positive-edge triggered
Supply Voltage 2 V ~ 6 V
Propagation Delay (tpd) 12 ns typical
Output Drive ±4 mA at 5 V (IOL/IOH: 5.2 mA / -5.2 mA max)
ICC (max) 80 µA
Max Clock Frequency 28 MHz
Clear Input Active-low (asynchronous)
Input Type Standard CMOS
Output Type Push-Pull
Package SOP-20 (NS) (12.6×7.8 mm)
Operating Temperature -40°C ~ +85°C

Features

  • Eight edge-triggered D-type flip-flops with single-rail outputs in a single package
  • Asynchronous active-low clear (CLR) input resets all outputs independently of clock
  • Individual data input for each flip-flop
  • Wide operating voltage range: 2 V to 6 V
  • Low power consumption: 80 µA max ICC
  • Can drive up to 10 LSTTL loads
  • Positive input clamp diodes for ESD protection

Applications

  • Data storage and address latching in microprocessor systems
  • Output register for bus-oriented systems
  • Parallel data hold and synchronization
  • State machine and control logic registers
  • Digital delay and pipeline register stages

The SN74HC273NSR from Texas Instruments contains eight positive-edge-triggered D-type flip-flops with a direct active-low clear (CLR) input. Data at the D inputs meeting the setup time requirements is transferred to the Q outputs on the positive-going edge of the clock (CLK) pulse. Clock triggering occurs at a particular voltage level and is not directly related to the transition time of the positive-going pulse. When CLK is at either high or low level, the D input has no effect on the output. The asynchronous CLR input, when asserted LOW, overrides the clock and forces all Q outputs LOW regardless of the D input states. The device operates over a wide voltage range of 2 V to 6 V with typical propagation delay of 12 ns, making it suitable for a wide variety of data storage and register applications.

The SN74HC273NSR contains eight independent D-type flip-flops sharing common clock (CLK) and clear (CLR) signals. Each flip-flop consists of a master-slave latch structure controlled by the clock edge. On the rising edge of CLK, the data present at each D input is captured and transferred to the corresponding Q output. The setup time requirement specifies the minimum time that data must be stable before the clock edge; the hold time specifies the minimum time data must remain stable after the clock edge. The asynchronous CLR input, when driven LOW, forces all Q outputs LOW immediately, overriding any clock or data input activity. The output stages use push-pull (totem-pole) CMOS drivers capable of sourcing or sinking up to 5.2 mA while maintaining valid logic levels. The internal CMOS structure provides very low static power consumption of 80 µA maximum.

Pin Name Type Function
1 CLR Input Asynchronous clear (active low), resets all Q outputs
2 Q1 Output Flip-flop 1 output
3 D1 Input Flip-flop 1 data input
4-11 D2-D5, Q2-Q5 I/O Flip-flops 2-5 data inputs and outputs
12 GND Power Ground
13-18 D6-D8, Q6-Q8 I/O Flip-flops 6-8 data inputs and outputs
19 CLK Input Common clock input (positive-edge triggered)
20 VCC Power Supply voltage (2-6V)
  • Address latching: Capturing and holding address data from a multiplexed address/data bus in microprocessor systems
  • Output registers: Holding output data stable in bus-oriented designs while the source changes
  • Data synchronization: Capturing asynchronous input data on a clock edge to eliminate metastability
  • State machines: Storing the current state vector in sequential logic designs
  • Pipeline registers: Inter-stage data storage in digital signal processing pipelines
Manufacturer Part Number Package Notes
TI SN74HC273N PDIP-20 Through-hole DIP package equivalent
TI SN74HC273PWR TSSOP-20 Smaller surface-mount package
TI SN74HCT273NSR SOP-20 HCT version, TTL-compatible inputs (4.5-5.5V)
Nexperia 74HC273D SOIC-20 Direct equivalent from Nexperia
TI SN74HC374N PDIP-20 Similar but with 3-state outputs (OE instead of CLR)
onsemi MC74HC273ADWR2G SOIC-20 Direct equivalent from onsemi
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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