Analog Devices Inc./Maxim Integrated DS1044-20

Overview

DS1044-20 from Maxim Integrated (formerly Dallas Semiconductor) is a 4-channel silicon delay line IC providing precise, independent 20 ns propagation delays (tPLH/tPHL) across all four buffered outputs. It operates at +5 V with ±1.5 ns initial tolerance and ±1.5 ns additional variation over 0°C to +70°C and 4.75–5.25 V supply. Each output drives up to 10 LS TTL loads and preserves input signal symmetry for high-speed timing alignment in digital test and synchronization circuits.

For engineers reviewing the DS1044-20 datasheet, DS1044-20 pinout, DS1044-20 application, or DS1044-20 equivalent, key selection criteria include guaranteed 20 ns nominal delay per channel, leading/trailing edge precision, DIP-14 package compatibility, and stable performance under industrial temperature and voltage variations without external components.

Technical Context

The DS1044-20 implements four independent, fully buffered delay paths in a single monolithic silicon circuit-no RC networks or external timing elements required. Each path delivers matched tPLH and tPHL values with ≤0.5 ns skew between rising and falling edges under nominal conditions.

It uses TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and provides rail-to-rail output swing into 15 pF load, with rise/fall times ≤2.5 ns. Power-up time is 100 ms, and active current draw is 45 mA at VCC = 5.25 V and 1 µs period.

Key Specifications

Pinout & Package

DS1044-20 is supplied in a 14-pin plastic dual in-line package (PDIP), 300 mil width, with standard through-hole footprint and RoHS-exempt lead finish. Pin 1 is VCC; pins 2–4 and 12–14 are no-connect (NC); pins 5–8 are outputs OUT1–OUT4; pins 9–11 are inputs IN1–IN3; pin 13 is IN4; pin 7 is GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel fixed-delay applications.

Compared with DS1044R-20 and DS1044-18, the DS1044-20 uniquely combines through-hole DIP-14 packaging with precisely specified 20 ns delay, making it optimal for lab validation, field-replaceable modules, and systems requiring mechanical robustness and socket-based serviceability.

Availability

DS1044-20 is available at Aetrix Electronics and suitable for digital test equipment, logic analyzer calibration, high-speed synchronization, industrial control signal alignment, and FPGA timing compensation requiring stable component supply and long-term obsolescence support.

Supply support for DS1044-20 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

Maxim Integrated (acquired Dallas Semiconductor in 2001) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, emphasizing reliability and long-lifecycle support.

The DS1044 series was developed by Dallas Semiconductor as a high-speed, all-silicon replacement for discrete RC delay networks in digital timing-critical systems - targeting test instrumentation, data acquisition, and logic-level synchronization.

FAQ

What is the exact delay value and tolerance of the DS1044-20?

The DS1044-20 provides a nominal propagation delay of 20 ns for both tPLH and tPHL across all four outputs. Its initial tolerance is ±1.5 ns at +25°C and VCC = 5.0 V, with an additional ±1.5 ns variation over the full operating range of 0°C to +70°C and 4.75–5.25 V supply. This total tolerance remains valid for both leading and trailing edges.

Does the DS1044-20 require external components to operate?

No, the DS1044-20 is a fully self-contained silicon delay line and requires no external resistors, capacitors, or crystals. Only a +5 V supply (with local 0.1 µF ceramic decoupling) and ground are needed. All four delay paths are internally buffered and electrically isolated, eliminating need for external fanout buffers or termination networks.

Is the DS1044-20 pin-compatible with other DS1044 variants like DS1044-10 or DS1044-12?

Yes, all DS1044-x variants-including DS1044-20-share identical pinout, package, and electrical interface. The only difference is nominal delay value (e.g., 10 ns, 12 ns, 20 ns). This allows direct substitution in existing layouts when timing budget changes, provided the new delay value meets system setup/hold requirements.

What is the maximum load the DS1044-20 outputs can drive?

Each DS1044-20 output is rated to drive up to 10 LS-TTL loads (equivalent to 10 × 20 µA high-level input current or 0.4 mA low-level sink). Under these conditions, output voltage levels remain within TTL specifications (VOH ≥ 2.4 V, VOL ≤ 0.4 V) with rise/fall times ≤2.5 ns into 15 pF load - matching standard 74F04 gate input characteristics.

Can the DS1044-20 be used in place of the DS1044R-20?

The DS1044-20 and DS1044R-20 share identical delay specification (20 ns), electrical parameters, and functional behavior-but differ in package: DS1044-20 is PDIP-14 (through-hole), while DS1044R-20 is SOIC-14 (surface-mount). They are not mechanically interchangeable; substitution requires PCB layout change. Electrical performance is otherwise equivalent.