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Analog Devices Inc./Maxim Integrated DS1021S-50
- Part No.:
- DS1021S-50
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Delay Lines
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DS1021S-50.pdf
- Description:
- IC DEL LN 256TAP 137.5NS 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
DS1021S-50 from Dallas Semiconductor (now Maxim Integrated) is a programmable 8-bit silicon delay line IC used for precise digital timing adjustment in high-speed logic systems. It provides a nominal step-zero delay of 10 ns, maximum delay of 137.5 ns, and 0.5 ns incremental steps across 256 programmable values. The device supports both 3-wire serial and 8-bit parallel programming modes and delivers leading and trailing edge accuracy without signal inversion - ideal for clock deskew, pulse width adjustment, and test instrumentation.
For engineers reviewing the DS1021S-50 datasheet, DS1021S-50 pinout, DS1021S-50 application, or DS1021S-50 equivalent, key selection considerations include its 16-pin SOIC package, TTL/CMOS compatibility, 5 V ±5% supply operation, dual programming interfaces, and verified edge-aligned delay accuracy under industrial temperature range (0°C to 70°C).
Technical Context
The DS1021S-50 implements an all-CMOS, user-programmable delay path with fixed 10 ns base delay plus 255 × 0.5 ns increments. Its architecture supports two independent configuration modes: parallel mode (S = 1) using P0–P7 pins for direct 8-bit delay value loading, and serial mode (S = 0) using D/C/Q signals for daisy-chainable MSB-first programming.
Both modes require E (Enable) asserted high during programming and guarantee accurate delay reproduction after tEDV = 50 µs settling time. The device drives up to 10 LS-TTL loads, features 1.5 V threshold delay measurement, and maintains rising/falling edge accuracy within ±8 ns total deviation over full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Delay Range | 10.0 ns to 137.5 ns (256 steps × 0.5 ns + 10 ns base) |
| Step Resolution | 0.5 ns per LSB - enables fine-grained timing control for jitter-sensitive applications |
| Supply Voltage | 4.75 V to 5.25 V - compatible with standard 5 V TTL/CMOS logic rails |
| Operating Temp | 0°C to 70°C - suitable for commercial and industrial embedded timing circuits |
| Output Drive | 8 mA sink / 1 mA source - sufficient for driving 10× 74LS loads without buffering |
| Settling Time | 50 µs after programming - defines minimum interval before stable delay output is guaranteed |
| Input Capacitance | 10 pF - low loading preserves signal integrity on high-speed input traces |
Pinout & Package
DS1021S-50 is housed in a 16-pin SOIC (300-mil) surface-mount package with standard JEDEC outline and vapor-phase/wave-solder compatible construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Delay Input | Primary logic signal entry point; delay measured from 1.5 V crossing on rising/falling edges |
| OUT | Delay Output | Non-inverted replica of IN after programmed delay; referenced to same 1.5 V threshold |
| P0–P7 | Parallel Program Inputs | 8-bit binary value sets delay in parallel mode (S = 1); unused pins must be tied to defined logic levels |
| S | Mode Select | High = parallel mode; Low = serial mode - determines which interface accepts programming data |
| E | Enable | Active-high control for latching parallel data or initiating serial load/read; must be high during programming |
| C | Serial Clock | Rising-edge-triggered clock for serial bit shifting; MSB first, tDSC = 30 ns setup required |
| D | Serial Data Input | Accepts 8-bit delay value in serial mode; unused in parallel mode and must be tied to valid logic level |
| Q | Serial Data Output | Shifts out current register contents during serial read; only sources 4 mA - intended for daisy-chaining |
| VCC | Power Supply | +5 V ±5% CMOS supply; tPU = 100 ms power-up functional delay applies |
| GND | Ground Reference | Signal and power return; decoupling recommended near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| All-silicon construction | Eliminates hybrid packaging reliability risks and enables full CMOS process benefits including low power and thermal stability |
| Dual programming interfaces | Supports both infrequent jumper/DIP-switch configuration (parallel) and automated microcontroller-based tuning (serial) |
| Edge-accurate delay | Guaranteed tPLH/tPHL matching within ±8 ns across full range - critical for skew-critical clock/data alignment |
| Daisy-chain capability | Q-to-D cascading allows synchronized programming of multiple DS1021S-50 units with single controller interface |
| Low-power CMOS | ICC ≤ 30 mA at 1 MHz operation - reduces thermal load and simplifies power delivery in dense PCB layouts |
Applications
| Test Equipment Timing Calibration | Digital Logic Skew Compensation |
|---|---|
|
Use Scenario: Adjusting propagation delay between reference and measured channels in automated test equipment (ATE) to calibrate time-interval analyzers. IC Role / Device Role / Timing Role: Programmable delay element inserted in signal path to nullify fixed board-level skew and enable sub-nanosecond channel alignment. Use Value: Enables traceable, software-controlled calibration without hardware modification - improves repeatability and reduces manual trim labor. |
Use Scenario: Compensating for unequal trace lengths between clock and data lines feeding FPGA I/O banks in high-speed parallel interfaces. IC Role / Device Role / Timing Role: Delay line placed on data path to match clock path propagation, ensuring setup/hold timing margins are met at receiver inputs. Use Value: Achieves deterministic inter-channel skew correction down to 0.5 ns resolution - avoids timing closure failures in 100+ MHz parallel buses. |
| Programmable Pulse Width Modulation | Logic Glitch Suppression |
|
Use Scenario: Generating variable-width strobes for memory refresh or sensor sampling windows in microcontroller-based data acquisition systems. IC Role / Device Role / Timing Role: Delayed version of trigger signal is ANDed with original to produce adjustable-width output pulse. Use Value: Provides digitally tunable pulse widths from 10 ns to 137.5 ns without external RC networks or PLLs - improves system flexibility and reduces BOM count. |
Use Scenario: Filtering short-duration noise spikes on control lines (e.g., reset, interrupt) in industrial PLC modules exposed to EMI. IC Role / Device Role / Timing Role: Signal passes through DS1021S-50 and is compared with original via XOR gate; outputs only pulses longer than programmed delay. Use Value: Rejects transients <10 ns while preserving legitimate logic transitions - eliminates false triggering without adding analog filtering components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable delay line applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1021S-25 | 0.25 ns step size, max 73.75 ns delay, same 10 ns base delay and pinout | Better resolution for ultra-fine timing adjustments but lower max delay range | Select when sub-0.5 ns precision is required and total delay budget ≤73.75 ns |
| MAX962 | Analog voltage-controlled delay (0–100 ns), no digital programming interface, ±10% linearity error | Lacks programmability and edge accuracy; requires DAC and op-amp support circuitry | Choose only if continuous analog tuning is mandatory and digital control is unavailable |
Compared with DS1021S-50, the DS1021S-25 offers finer resolution but reduced range, while the MAX962 trades programmability and precision for analog tunability - making DS1021S-50 optimal for digitally controlled, edge-accurate delay applications requiring 137.5 ns headroom.
Availability
DS1021S-50 is available at Aetrix Electronics and suitable for test instrumentation, digital logic timing alignment, programmable pulse generation, and industrial control systems requiring stable component supply and long-term obsolescence management.
Supply support for DS1021S-50 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
Dallas Semiconductor, acquired by Maxim Integrated in 2001, specialized in precision analog, timing, and secure memory ICs for industrial and communications applications.
The DS1021 product line was designed to replace hybrid delay lines with fully integrated, programmable silicon solutions offering superior reliability, solderability, and digital configurability in commercial-grade timing systems.
FAQ
What is the base (step-zero) delay of the DS1021S-50?
The DS1021S-50 has a nominal step-zero delay of 10.0 ns, meaning even with all program bits set to zero, the signal experiences a fixed 10 ns propagation delay from IN to OUT. This base delay is specified as 10 ±2 ns over temperature and supply variations, and it forms the offset for all 255 additional 0.5 ns increments.
Can the DS1021S-50 be used with 3.3 V logic systems?
No - the DS1021S-50 is strictly a 5 V device with VIH minimum of 2.2 V and VIL maximum of 0.8 V, and its internal CMOS core operates only within 4.75 V to 5.25 V. It is not 3.3 V tolerant; interfacing with 3.3 V controllers requires level translation on IN, OUT, and all control pins (S, E, C, D, Q, P0–P7).
How does serial readback work on the DS1021S-50?
Serial readback on the DS1021S-50 is destructive: asserting E = 1 while C = 0 initiates output of the current 8-bit register on Q, MSB first. To restore the value, the same 8 bits must be clocked back in via D before E returns low. A 1 kΩ–10 kΩ resistor between Q and D enables automatic restoration during read cycles, preserving the programmed delay without requiring external latch logic.
Is the DS1021S-50 pin-compatible with other DS1021 variants?
Yes - all DS1021 variants including DS1021S-25 and DS1021S-50 share identical 16-pin SOIC pinouts, electrical interface definitions, and functional pin behavior. The only differences are internal delay range and step size; no PCB layout changes are needed when substituting between -25 and -50 versions.
What is the maximum clock frequency supported for serial programming of the DS1021S-50?
The DS1021S-50 supports a maximum serial clock (C) frequency of 10 MHz, with minimum clock width (tCW) and enable width (tEW) both specified at 50 ns. This allows full 8-bit programming in under 1 µs, enabling rapid dynamic reconfiguration in real-time timing adjustment applications.
DS1021S-50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Taps/Steps:
- 256
- Function:
- Programmable
- Delay to 1st Tap:
- 10ns
- Tap Increment:
- 500 ps
- Available Total Delays:
- 137.5ns
- Number of Independent Delays:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS1021S-50 FAQ
1.How can I place an order for DS1021S-50 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1021S-50 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 DS1021S-50 reliable?
The price and inventory of DS1021S-50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1021S-50 is usually 5 days.
3.What payment methods are accepted for DS1021S-50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1021S-50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1021S-50?
DS1021S-50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1021S-50 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 DS1021S-50?
For technical support, including DS1021S-50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1021S-50 requirements.
6.How does Aetrix verify that DS1021S-50 is sourced from the original manufacturer or authorized distributors?
All DS1021S-50 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 DS1021S-50 meets industry standards.
7.What is the process for return or replacement of DS1021S-50?
All DS1021S-50 units undergo pre-shipment inspection (PSI). If there is an issue with DS1021S-50, 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 DS1021S-50 part is unused and in its original packaging.
Return procedure for DS1021S-50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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