SY604JC - 255-Tap 4-40ns Programmable Delay | Microchip
MPN: SY604JC ✓ ActiveSY604JC Overview
A programmable delay line, delay generator, or timing vernier is a timing IC that inserts a digitally selected interval into a signal path. Its hierarchy is timing IC to delay-line IC to programmable timing component. SY604JC uses an 8-bit code loaded concurrently with the circuit trigger to select among 255 delay taps, making it useful where calibrated timing, pulse positioning, clock alignment, or retriggerable edge delays are required.
The verified feature set emphasizes fine delay granularity. The provided Microchip product-page information specifies a 15.7ps tap increment, while another verified source states 15ps delay resolution. Differential trigger inputs support timing-control arrangements that can reduce common-mode sensitivity. The ECL-compatible interface places the part in high-speed logic systems where short, programmable delays are more useful than a general-purpose fixed-delay element.
Technically, SY604JC is fabricated in Micrel-Synergys proprietary ASSET bipolar process, as stated in the verified datasheet search data. The 28-LCC J-lead package provides a defined leaded footprint for board-level assembly and rework. The available evidence describes one independent delay, 255 taps or steps, and timing accuracy of less than ±1 LSB; exact rise and fall times, supply-voltage range, and temperature limits were not supplied and therefore remain data-needed rather than inferred.
Typical uses include digital trigger conditioning, high-speed test systems, pulse-generation circuits, clock-phase adjustment, and ECL-compatible timing modules. The 4ns to 40ns span is particularly appropriate for short timing offsets that must be digitally selected rather than approximated with analog trimmer networks. The 125MHz retrigger capability can suit repetitive high-rate timing systems when system timing budgets meet the device requirements.
A key design consideration is that the control code must be coordinated with the trigger event because the verified description says the 8-bit code is loaded concurrently with the trigger. Preserve adequate routing margin for the differential trigger and delay outputs, and verify the exact logic levels and timing specifications against the manufacturer datasheet before layout signoff. The 350mW typical dissipation also calls for normal package thermal review.
This page combines verified distributor, manufacturer-related, and datasheet-search information with application guidance and explicitly identifies missing electrical details. It does not invent substitute parts where the supplied cross-reference results contain no confirmed pin-compatible equivalent.
Drop-in alternatives for SY604JC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SY604JC (same form factor and footprint) — differing in Logic Compatibility, Package, Product Type, Retrigger Rate, Typical Power Dissipation.
No drop-in alternatives available for this product.
Request AlternativesSY604JC Specifications
| Product Type | Programmable delay line IC / timing vernier |
| Number of Taps | 255 taps |
| Number of Taps or Steps | 255 |
| Available Total Delay | 4ns to 40ns |
| Delay to First Tap | 4ns |
| Tap Increment | 15.7ps |
| Delay Resolution | 15ps |
| Timing Accuracy | Less than ±1 LSB |
| Retrigger Rate | 125 MHz |
| Number of Independent Delays | 1 |
| Logic Compatibility | ECL-compatible |
| Trigger Inputs | Differential TRIGGER inputs |
| Typical Power Dissipation | 350mW typical |
| Process Technology | Micrel-Synergys proprietary ASSET bipolar process |
| Package | 28-LCC J-lead |
| Mounting Type | Surface mount |
| Packaging | Tube |
| Program Control | 8-bit code loaded concurrently with circuit trigger |
| Supplier Price | From $40.4216 as of 2026-10-23 |
SY604JC 28-lcc j-lead Pin Configuration Guide
Pin configuration for SY604JC (28-lcc j-lead package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SY604JC.
Refer to the datasheet for full pin configuration.
Typical Applications
SY604JC is suitable for 6 applications: High-Speed Digital Trigger Conditioning, Pulse-Position Calibration, Clock and Edge Alignment, High-Speed Automated Test Systems, Pulse-Generator Timing Vernier, ECL-Compatible Timing Modules.
High-Speed Digital Trigger Conditioning
SY604JC fits trigger-conditioning circuits that need a short, digitally adjustable interval between an incoming edge and a downstream ECL-compatible event. Its verified differential TRIGGER inputs provide a useful control structure for systems that benefit from noise-resistant differential timing, while the 4ns to 40ns span and 15ps stated resolution allow fine edge placement. The 8-bit code is loaded concurrently with the trigger, so the surrounding controller must meet setup requirements from the manufacturer datasheet. Compared with a fixed delay element, the part adds calibration flexibility, but its programming interface must be integrated into the timing-control logic.
Recommended
Pulse-Position Calibration
The SY604JC is suitable for pulse-position calibration systems that need to move an ECL-compatible edge by a programmable amount from 4ns to 40ns. Its 255 taps and 15.7ps stated tap increment provide a way to express fine timing corrections in digital code rather than relying on analog trimmer adjustment. In implementation, the 8-bit programming code must be coordinated with the circuit trigger, and output timing must be checked against the receiver’s setup and hold requirements. This use is especially valuable in laboratory timing generators where repeatable calibration is more important than minimizing logic complexity.
Recommended
Clock and Edge Alignment
SY604JC can be used to align a trigger edge with a clock or another signal path in a high-speed test module. The device’s 4ns first-tap delay and total range to 40ns allow short relative timing offsets, while the 125MHz retrigger rate supports repetitive event environments. Differential trigger inputs can help reduce susceptibility to common-mode disturbance when routing is designed correctly. Actual edge alignment must be verified with the actual output load, logic family, and timing receiver; the supplied data does not include complete rise-time, jitter, or output-loading curves.
Recommended
High-Speed Automated Test Systems
The SY604JC is applicable to automated test systems that repeatedly trigger measurement or stimulus sequences and require a selectable timing offset. Its true 125MHz retrigger-rate claim and 255 programmable taps can make the timing interval a controlled variable rather than a fixed mechanical or analog setting. The ECL-compatible interface fits legacy high-speed test logic, while the 28-LCC J-lead package supports conventional board assembly. Because the verified data does not establish full AC timing limits, system qualification should include worst-case delay-code, temperature, supply, and loading measurements before production use.
Recommended
Pulse-Generator Timing Vernier
SY604JC can serve as a timing vernier inside a pulse generator, allowing a controller to trim edge position with an 8-bit code while the trigger is applied. Its programmable 4ns to 40ns interval is useful for compensating propagation differences among cables, gates, receivers, or measurement channels. The 350mW typical dissipation should be considered during enclosure and board thermal design. Designers should also preserve the differential trigger topology and verify the device’s exact output timing and logic thresholds from the manufacturer documentation before setting a pulse-width tolerance.
Recommended
ECL-Compatible Timing Modules
The SY604JC is a natural fit for legacy ECL-compatible timing modules because the verified description explicitly identifies ECL operation and 10KH ECL compatibility. It can add a programmable interval to a trigger path without requiring a modern FPGA timing architecture. The 125MHz retrigger capability supports repeated high-rate events, while the 28-LCC J-lead package and tube packaging are compatible with established through-hole-style surface-mount assembly practices. Integration must account for ECL termination, signal polarity, power distribution, and timing margins that are not fully quantified in the supplied search snippets.
Recommended
Recommended Products Summary
Engineering reference data for SY604JC — comparison, design guidance, and compliance information.
Selection Guide
Key Differentiators
- Digitally programmable timing interval (vs Fixed-delay line)
- High-speed retrigger capability (vs Generic low-speed delay element)
- Differential trigger control (vs Single-ended programmable delay device)
Design Notes
Preserve the differential TRIGGER routing shown by the verified device description and keep the two trigger paths geometrically matched. Avoid long stubs and unnecessary test-pad branches because the SY604JC is intended for short, high-speed timing intervals. Confirm the exact trigger polarity and input thresholds against the manufacturer datasheet before assigning control logic; the supplied snippets do not provide a complete pin table or AC input specification.
Coordinate the 8-bit programming code with the trigger event. The verified datasheet search data says the code is loaded concurrently with the circuit trigger, so a controller must meet the required setup relationship rather than changing the code asynchronously at the moment timing accuracy matters. Keep programming traces away from sensitive delay and trigger paths, and test the selected code over the full intended operating range.
Use the verified 350mW typical dissipation as an initial thermal-review input, not as a maximum rating. Estimated thermal analysis requires the actual supply voltage, output loading, duty cycle, ambient temperature, and PCB copper area; those values were not supplied and must not be guessed. Provide the 28-LCC J-lead device with a layout consistent with its package drawing and inspect temperature rise at the maximum expected operating condition.
Compliance Information
No RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification evidence was included in the verified web data. SY604JC is a timing IC, so AEC-Q100 is recorded as not_applicable rather than qualified.
