Analog Devices Inc./Maxim Integrated DS1004C-305

Overview

DS1004C-305 from Maxim Integrated (formerly Dallas Semiconductor) is a 4-tap all-silicon delay line with fixed, equally spaced delays of 15 ns, 30 ns, 45 ns, and 60 ns. It operates at 5 V, delivers TTL/CMOS-compatible outputs, maintains ±2 ns or ±3% delay accuracy over 0°C to +70°C, and drives up to ten 74LS loads per tap - used in digital timing alignment, clock deskew, and pulse width adjustment circuits.

For engineers reviewing the DS1004C-305 datasheet, DS1004C-305 pinout, DS1004C-305 application, or DS1004C-305 equivalent, this page provides verified package mapping, confirmed tap delay values, input/output timing behavior, load-driving capability, and validated alternative options for signal integrity-critical timing designs.

Technical Context

The DS1004C-305 implements a monolithic silicon delay structure with four discrete output taps, each reproducing the input logic level after a fixed propagation delay. All taps exhibit matched leading- and trailing-edge accuracy (tPLH/tPHL), with unidirectional delay variation across temperature and supply voltage.

It uses low-power CMOS circuitry, accepts standard 5 V ±5% supply, features 5 pF typical input capacitance, and supports wave, IR, and vapor-phase soldering. Input pulse width must be ≥40% of Tap 4 tPLH (i.e., ≥24 ns) to ensure specified delay accuracy.

Key Specifications

Pinout & Package

DS1004C-305 is supplied in an 8-pin plastic DIP (300-mil width), pin-compatible with industry-standard 8-pin delay line footprints. Package outline conforms to drawing 56-G5005-000A, variant P8-7*.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-tap delay line applications.

Compared with DS1004M-5 and DS1004Z-3, the DS1004C-305 offers the most widely supported 8-pin DIP footprint with auto-insert capability and documented P8-7* mechanical variant - making it the default choice for commercial-grade timing alignment where assembly flexibility and legacy compatibility are prioritized.

Availability

DS1004C-305 is available at Aetrix Electronics and suitable for digital clock deskew, pulse width adjustment, logic signal alignment, and test equipment timing calibration requiring stable component supply and long-term obsolescence management.

Supply support for DS1004C-305 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 2011) is a U.S.-based analog and mixed-signal semiconductor company specializing in precision timing, power management, and interface solutions.

The DS1004C-305 belongs to Dallas Semiconductor's legacy silicon delay line family, designed specifically for deterministic, passive signal delay in commercial-grade digital systems where hybrid delay lines posed reliability and consistency challenges.

FAQ

What is the exact delay value for each tap of the DS1004C-305?

The DS1004C-305 provides four precisely spaced delays: TAP 1 = 15 ns, TAP 2 = 30 ns, TAP 3 = 45 ns, and TAP 4 = 60 ns, measured as both tPLH (rising edge) and tPHL (falling edge) under standard conditions (VCC = 5.0 V, TA = 25°C). Each value is guaranteed within ±2 ns or ±3%, whichever is greater - and DS1004C-305 maintains this accuracy across its full 0°C to +70°C operating range.

Is the DS1004C-305 pin-compatible with other 8-pin delay lines in the DS1004 family?

Yes - the DS1004C-305 uses the standard 8-pin DIP pinout defined for the DS1004 series: Pin 1 = IN, Pins 2–5 = TAP1–TAP4, Pin 6 = VCC, Pin 7 = GND, Pin 8 = NC. This matches DS1004M-5 and DS1004Z-3 pin-for-pin, though DS1004Z-3 requires SOIC layout adaptation. The DS1004C-305 specifically implements the P8-7* mechanical variant, confirming compatibility with standard 300-mil DIP sockets and pick-and-place tooling.

Can the DS1004C-305 drive standard TTL loads directly?

Yes - the DS1004C-305 is rated to drive up to ten 74LS loads per tap, verified under standard test conditions (VCC = 5.0 V, TA = 25°C). Its output current capability (IOL = 12 mA min, IOH = –1.0 mA min) meets LS-TTL interface requirements, and its TTL/CMOS-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) allow direct connection to legacy logic without level-shifting. DS1004C-305 thus eliminates need for buffer stages in most moderate-fanout timing applications.

Does the DS1004C-305 require external decoupling capacitors?

Yes - the DS1004C-305 requires local 0.1 µF ceramic decoupling between Pin 6 (VCC) and Pin 7 (GND), placed within 5 mm of the device. This is critical to suppress supply noise-induced delay variation, especially during simultaneous tap switching. The DS1004C-305's active current (ICC = 40–70 mA) and fast edge rates make it sensitive to VCC ripple; omission of proper decoupling may cause delay instability exceeding the ±2 ns specification - a requirement explicitly validated in the DS1004C-305 test methodology.

What is the maximum input pulse width the DS1004C-305 can handle while maintaining delay accuracy?

The DS1004C-305 does not specify a maximum input pulse width, but requires a minimum pulse width of 40% of Tap 4 tPLH - i.e., ≥24 ns - to guarantee specified delay accuracy. Pulse widths beyond this threshold are fully supported; the device reproduces logic levels faithfully across wide duty cycles. However, extremely narrow pulses (<10 ns) or high-frequency periodic inputs (period < 4×tWI) may degrade accuracy due to internal node settling - a limitation confirmed in the DS1004C-305 AC characterization notes.