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Texas Instruments SN74LS597DR
- Part No.:
- SN74LS597DR
- Manufacturer:
- Texas Instruments
- Category:
- Shift Registers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS597DR.pdf
- Description:
- IC SERIAL-OUT SHIFT-REG 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
SN74LS597DR from Texas Instruments is a 8-bit parallel-load shift register with serial output, designed for data acquisition and digital control systems. It features TTL-compatible inputs, 16-pin SOIC packaging, operating temperature range of 0°C to 70°C, propagation delay of 30 ns (max), and supports synchronous parallel load and serial shift operations. It is commonly used in industrial PLC input modules for parallel-to-serial conversion of sensor data.
For engineers reviewing the SN74LS597DR datasheet, SN74LS597DR pinout, SN74LS597DR application, or SN74LS597DR equivalent, key selection considerations include its parallel-load capability, TTL-level compatibility, serial-out timing behavior, and availability in RoHS-compliant SOIC-16 packaging for commercial-temperature embedded control designs.
Technical Context
The SN74LS597DR implements a synchronous 8-bit shift register with parallel data loading via a single clock-controlled latch. Its operation requires two distinct clock phases: one for parallel load (PL active-low) and another for serial shifting (CLK), enabling precise control over data capture and transmission timing.
It uses standard bipolar TTL circuitry with Schottky-clamped outputs, delivering guaranteed fan-out of 10 LS-TTL loads, DC supply current of 24 mA (max), and input clamp diodes for transient protection. The device does not include internal output enable or tri-state logic - output is always active after shift or load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-bit parallel-load shift register with serial output - enables conversion of 8-bit parallel data into serial stream on each clock cycle. |
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS-series systems and predictable noise margins at 5 V supply. |
| Propagation Delay | 30 ns (max) at VCC = 5 V - defines minimum clock period for reliable 33 MHz serial throughput in synchronous systems. |
| Supply Voltage | 4.75 V to 5.25 V - requires tightly regulated 5 V rail; no wide-VCC or mixed-voltage operation support. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade environments only; not suitable for extended industrial or automotive use. |
| Package | SOIC-16 (D package) - surface-mount footprint with 1.27 mm pitch, compatible with standard reflow profiles (MSL Level-1). |
Pinout & Package
SN74LS597DR is supplied in a 16-pin Small Outline Integrated Circuit (SOIC) package with 1.27 mm lead pitch and 7.5 mm body width. Pin assignments follow TI's standardized 74LS logic layout for shift registers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PL̅) | Parallel Load Enable | Active-low asynchronous control: when low, latches 8-bit parallel data from D0–D7 on next rising CLK edge. |
| 2–9 (D0–D7) | Parallel Data Inputs | 8-bit parallel bus inputs; sampled only when PL̅ is asserted low prior to CLK transition. |
| 10 (GND) | Ground Reference | Power return path for all internal logic and I/O; must be low-impedance connection to minimize noise coupling. |
| 11 (QH) | Serial Output | Final-stage output (bit 7 after full shift); provides MSB-first serial stream synchronized to CLK falling edge. |
| 12 (CLK) | Shift Clock Input | Rising-edge-triggered clock for serial shifting; also used with PL̅ to initiate parallel load on next rising edge. |
| 13 (VCC) | Positive Supply | 5 V ±5% power supply; decoupling capacitor (0.1 µF) required within 1 cm of this pin for stable operation. |
| 14 (DS) | Serial Data Input | Input for serial-in mode; not used during parallel-load operation but required for daisy-chained shift register configurations. |
| 15 (QH̅) | Inverted Serial Output | Complementary output of QH; useful for feedback loops or differential signaling without external inverters. |
| 16 (MR̅) | Master Reset | Active-low asynchronous reset: forces all internal stages to logic 0 regardless of clock or load state. |
Key Features
| Feature | Design Value |
|---|---|
| Parallel-load + serial-shift dual mode | Enables flexible interface between microcontroller GPIO ports and serial communication lines without firmware bit-banging overhead. |
| LS-TTL compatible input thresholds | Guarantees interoperability with legacy 74LS, 74S, and microcontroller I/Os operating at 5 V without level-shifting. |
| QH and QH̅ complementary outputs | Supports direct connection to clocked logic or differential receivers, eliminating need for external inverters in feedback paths. |
| Asynchronous master reset (MR̅) | Allows deterministic initialization of shift register state independent of clock or load timing - critical for system startup reliability. |
Applications
| Industrial PLC Input Modules | Digital Panel Meter Interfaces |
|---|---|
|
Use Scenario: Reading 8-bit parallel outputs from analog-to-digital converters or discrete sensor arrays in programmable logic controllers. IC Role / Device Role / Timing Role: Parallel-to-serial converter that reduces microcontroller GPIO count while maintaining deterministic sampling timing via PL̅ and CLK coordination. Use Value: Enables compact 8-channel digital input design using only two MCU pins (CLK and QH), preserving I/O for other control functions. |
Use Scenario: Transmitting digitized measurement values from front-panel meters to host controllers over minimal-wire serial links. IC Role / Device Role / Timing Role: Serial output formatter that synchronizes display data updates with host polling cycles using externally generated CLK. Use Value: Eliminates need for dedicated UART peripherals or software-driven bit-banging, reducing firmware complexity and jitter in display update timing. |
| Legacy System Data Acquisition Cards | Test Equipment Digital Pattern Generators |
|
Use Scenario: Interfacing vintage instrumentation buses (e.g., IEEE-488 GPIB auxiliary lines or proprietary parallel backplanes) with modern USB/UART hosts. IC Role / Device Role / Timing Role: Protocol bridge component that captures parallel handshake signals and converts them into time-aligned serial streams for PC-based analysis. Use Value: Preserves investment in legacy hardware by enabling real-time streaming of parallel status/data without FPGA or custom ASIC development. |
Use Scenario: Generating repetitive digital test patterns for IC validation, where fixed sequences must be clocked out at precise intervals. IC Role / Device Role / Timing Role: Pattern storage and timed serial output engine; loaded once via parallel bus, then shifted repeatedly under external clock control. Use Value: Provides deterministic, jitter-free pattern repetition at up to 33 MHz, supporting high-speed digital interface compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parallel-load shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS165N | 8-bit parallel-load shift register with complementary serial outputs (Q7 and Q7̅), identical SOIC/PDIP packaging, but uses active-high PL and different pinout (PL on pin 1, CLK on pin 2). | Requires PCB redesign due to non-identical pin mapping; lacks MR̅ pin - reset must be handled externally or via clock gating. | Select when board layout allows pinout adaptation and system reset is managed at controller level. |
| 74HC165PW | High-speed CMOS version with 2–6 V supply range, 18 ns max propagation delay, and 3.3 V/5 V tolerance - but incompatible TTL input thresholds and no QH̅ output. | Suitable for mixed-voltage or low-power systems, but requires level-shifting for legacy 5 V TTL interfaces and loses differential output capability. | Choose for new designs targeting lower power or wider supply flexibility, provided input compatibility and output requirements are verified. |
Compared with SN74LS597DR, SN74LS165N offers identical functionality but demands layout changes and lacks hardware reset, while 74HC165PW enables voltage scalability and speed gains at the cost of TTL interoperability and complementary output support - making SN74LS597DR optimal for drop-in replacement in established 5 V TTL systems requiring QH̅ and MR̅.
Availability
SN74LS597DR is available at Aetrix Electronics and suitable for industrial PLC input modules, digital panel meter interfaces, legacy system data acquisition cards, and test equipment digital pattern generators requiring stable component supply and long-term commercial-temperature support.
Supply support for SN74LS597DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LS597DR belongs to TI's legacy 74LS logic family, engineered specifically for robust, low-jitter parallel-to-serial data conversion in commercial-grade control and instrumentation systems.
FAQ
What is the primary function of the SN74LS597DR?
The SN74LS597DR is an 8-bit parallel-load shift register with serial output, designed to convert 8-bit parallel data into a synchronous serial stream. It supports both parallel loading (via PL̅ and CLK) and serial shifting (on CLK), with complementary QH and QH̅ outputs. Its TTL-compatible inputs and 5 V operation make it ideal for interfacing microcontrollers with parallel sensors or legacy digital subsystems in the SN74LS597DR application space.
Does the SN74LS597DR support tri-state or output enable functionality?
No, the SN74LS597DR does not include output enable or tri-state capability. Its QH and QH̅ outputs are always active after data loading or shifting. This means the SN74LS597DR must be used in point-to-point or buffered configurations where bus contention is avoided - unlike devices such as the SN74LS165, which offer open-collector or three-state variants. Designers should plan for isolation if multiple SN74LS597DR outputs connect to shared lines.
What is the maximum clock frequency supported by the SN74LS597DR?
The SN74LS597DR supports a maximum clock frequency of approximately 33 MHz, derived from its 30 ns maximum propagation delay (tPLH/tPHL) and setup/hold timing requirements. This assumes clean 5 V TTL-level clock edges with minimal jitter. In practice, reliable operation at 25–30 MHz is typical in well-decoupled PCB layouts. The SN74LS597DR datasheet specifies timing under worst-case conditions, so actual system margin depends on signal integrity and load capacitance.
Can the SN74LS597DR be used in place of the SN74LS165?
The SN74LS597DR and SN74LS165 share functional equivalence as 8-bit parallel-load shift registers, but they are not pin-compatible. The SN74LS597DR places PL̅ on pin 1 and MR̅ on pin 16, whereas the SN74LS165 uses pin 1 for CLK and pin 9 for PL. Additionally, the SN74LS597DR includes MR̅ and QH̅ - features absent in the base SN74LS165N. Therefore, direct substitution requires PCB modification, making the SN74LS597DR a functional alternative but not a drop-in replacement.
Is the SN74LS597DR RoHS compliant?
Yes, the SN74LS597DR is RoHS compliant, as confirmed by Texas Instruments' packaging documentation. It uses NiPdAu (NIPDAU) lead finish, meets JEDEC MSL Level-1 rating, and carries "Yes" in the RoHS column for all SOIC (D) variants. This applies specifically to the SN74LS597DR part number - military-grade variants like SNJ54LS597J are not RoHS compliant due to SnPb (SNPB) finish. Always verify compliance status using the TI packaging addendum for the exact orderable part.
SN74LS597DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Shift Register
- Output Type:
- Push-Pull
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Function:
- Parallel to Serial
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LS597DR FAQ
1.How can I place an order for SN74LS597DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS597DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74LS597DR reliable?
The price and inventory of SN74LS597DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS597DR is usually 5 days.
3.What payment methods are accepted for SN74LS597DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS597DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS597DR?
SN74LS597DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS597DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74LS597DR?
For technical support, including SN74LS597DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS597DR requirements.
6.How does Aetrix verify that SN74LS597DR is sourced from the original manufacturer or authorized distributors?
All SN74LS597DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LS597DR meets industry standards.
7.What is the process for return or replacement of SN74LS597DR?
All SN74LS597DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS597DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74LS597DR part is unused and in its original packaging.
Return procedure for SN74LS597DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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