SY55853UKG - 2.5GHz Differential D-Type Latch | Microchip
部品番号: SY55853UKG ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1,000 | $4.53 | $4,530.00 |
SY55853UKG 概要
A D-type transparent latch is a sequential logic element that, while enabled, flows input data directly to the output (transparent mode), and when disabled, stores or holds the last sampled bit. Within the signal-chain hierarchy, high-speed latches like the SY55853U family sit between pure combinational logic and flip-flops, providing pipelining, data synchronization, and asynchronous sampling in gigahertz-class signal paths such as clock distribution and data retiming circuits.
Key features include a minimum toggle frequency (fmax) of 2.5 GHz, operation with a power supply up to 5.7 V, and a propagation delay of 400 ps. The device accepts CML, PECL, and LVPECL input logic levels, making it easy to drop into existing high-speed ECL-class signal chains without level-shifting circuitry.
Architecturally, the SY55853UKG is fully differential from input to output. Source-terminated CML outputs deliver fast edge rates with controlled impedance, minimizing reflections and ringing on transmission-line PCB traces. The part is optimized to work within Micrel's SuperLite family of precision timing and interface products, sharing compatible logic levels and supply requirements across the family.
Typical applications include high-speed data retiming in telecom and optical networking line cards, clock glitch-free switching and synchronization in test instrumentation, and sampling of fast serial data streams in ATE (automated test equipment) systems. Its GHz-class fmax and sub-ns propagation delay suit any path where setup/hold margins are measured in picoseconds.
Design consideration: because the latch is obsolete (no longer manufactured), new designs should select an active Microchip Precision Edge or equivalent part, and existing designs should secure remaining distributor stock or qualify a drop-in substitute before final layout freeze.
This page adds value beyond the datasheet by synthesizing distributor stock data, lifecycle status, drop-in family alternatives (SY55853UKC, SY55853UKI), and practical design notes for engineers managing last-time-buy decisions on obsolete high-speed logic.
ドロップイン代替品: SY55853UKG — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
SY55853UKC
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SY55853UKI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SY55853UKG 最大定格＆電気的特性
| Logic Function | D-Type Transparent Latch, 1 bit |
| チャネル数 | 1 Channel, 1:1 |
| 出力タイプ | Differential, source-terminated CML |
| Maximum Toggle Frequency | 2.5 GHz (min fmax) |
| Propagation Delay | 400 ps |
| Supply Voltage (max) | 5.7 V |
| Input Logic Levels Accepted | CML, PECL, LVPECL |
| Product Family | SY55 / SuperLite |
| パッケージ | 10-MSOP / 10-TFSOP (0.118 in, 3.00 mm width) |
| 実装タイプ | Surface Mount |
| 動作温度 | -40C to +85C |
| Packaging | Tape & Reel (TR suffix) |
| ライフサイクル状態 | Obsolete (Part Status per distributor) |
SY55853UKG 10-msop / 10-tfsop (0.118 in, 3.00 mm width) ピン配置ガイド
SY55853UKG (10-msop / 10-tfsop (0.118 in, 3.00 mm width) パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: SY55853UKG.
詳細は データシート をご参照ください。
主な用途
SY55853UKG の用途: 6 件s: Optical Networking Data Retiming, High-Speed Clock Synchronization, Automated Test Equipment (ATE) Pin Electronics, High-Speed Data Acquisition Front Ends, Serial Data Communications Equipment, Precision Timing and Instrumentation Gating.
Optical Networking Data Retiming
In optical line cards and transponder modules, serial data streams recovered from the photodetector path must be resampled to remove jitter before further processing. The SY55853UKG fits this role because its 2.5 GHz minimum fmax and 400 ps propagation delay allow it to capture multi-gigabit data edges with picosecond-level setup/hold margins. Its CML, PECL, and LVPECL input acceptance lets it connect directly to the limiting amplifier or CDR output without level shifting, while fully differential source-terminated CML outputs drive the downstream serdes or framer over controlled-impedance traces with minimal reflection. The latch's transparent mode supports pass-through during link training, and latch mode holds the bit during reframe events, improving link robustness during transients.
おすすめ
High-Speed Clock Synchronization
Timing distribution cards in telecom and test systems often need to align or gate fast clock edges without adding skew. The SY55853UKG's differential architecture preserves the common-mode rejection and edge fidelity of PECL/CML clock trees, and its GHz-class toggle rate handles 2.5 GHz-class references directly. Placed at the point of use, the latch resamples a distributed clock with a local clean reference, suppressing accumulated jitter from long backplane runs. Because it is optimized for Micrel's SuperLite family, it shares logic levels and supply requirements with companion SY55-series delay lines, fanout buffers, and PLLs, simplifying a single-supply, single-logic-class clock tree design. Source-terminated CML outputs eliminate the need for external series resistors at each clock output.
おすすめ
Automated Test Equipment (ATE) Pin Electronics
ATE pin drivers and comparators require last-stage sampling elements with sub-nanosecond delay and deterministic timing. The SY55853UKG provides a 400 ps propagation delay with tight differential symmetry, letting test programs predict timing closures at gigahertz data rates. Its ability to accept CML, PECL, and LVPECL waveforms means one latch handles multiple drive-format standards across test channels. The 10-MSOP 3.00 mm body packs into dense per-pin electronics located close to the device-under-test socket, keeping trace stubs short and preserving edge rates. Transparent-latch behavior supports both streaming capture and hold modes used in per-pin fail-memory strobing. Differential outputs resist the ground bounce typical of large ATE load boards with many simultaneously switching channels.
おすすめ
High-Speed Data Acquisition Front Ends
Wideband digitizer and oscilloscope front ends use fast latches to pipeline comparator decisions ahead of slower digital processing. The SY55853UKG's 2.5 GHz fmax matches the sample-decision rates of flash converters and sampling heads, while its 400 ps delay adds deterministic, calibratable latency to the timing budget. Differential CML outputs drive retiming or deserialization logic with controlled edges, and the latch's 5.7 V-capable supply integrates with positive-rail PECL signal chains commonly used in instrument front ends. Because inputs accept LVPECL from typical comparator outputs, no extra translation stage is needed between the sampler and the latch. On the PCB, short matched-length differential pairs from latch to next stage preserve the picosecond skew allocation.
おすすめ
Serial Data Communications Equipment
Legacy SONET/SDH and gigabit serial equipment built around positive ECL-class logic used latches like the SY55853UKG for bit alignment, framing, and deskew functions between the CDR and the framer ASIC. With CML/PECL/LVPECL input compatibility and a 2.5 GHz toggle rate, the latch supports OC-48-class (2.5 Gbps) data paths directly. Its fully differential input and output structure rejects supply and ground noise common in shelf-mounted telecom cards with high channel density. Maintenance engineers supporting installed telecom hardware frequently need this exact obsolete MPN for board-level repair, which is why remaining distributor stock matters for sustaining legacy networks. Replacement with same-family SY55853UKC/UKI units requires no circuit or layout changes.
おすすめ
Precision Timing and Instrumentation Gating
Bench instrumentation, pulse counting, and time-interval measurement setups use a transparent latch as a synchronous gate that either streams events or freezes a logic state at a precise instant. The SY55853UKG's sub-ns, low-skew differential operation lets the latch be strobed by a timing reference with picosecond-level aperture uncertainty. Its SuperLite-family optimization ensures consistent behavior with SY55-series precision delay and fanout devices in the same signal chain. The latch's hold mode captures a single-bit result for readout by slower logic, effectively acting as a 1-bit time-to-digital front end. Differential CML outputs maintain fast edges into 50-ohm instrumentation inputs, and the -40C to +85C operating range covers both lab and field environments.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SY55853UKG — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SY55853UKC | SY55853UKI |
|---|---|---|---|
| Package | 10-MSOP / 10-TFSOP (3.00 mm width) | 10-MSOP - same | 10-TFSOP / 10-MSOP - same |
| Brand | Microchip Technology (Micrel) | Microchip Technology (Micrel) | Microchip Technology (Micrel) |
| Toggle Frequency (min fmax) | 2.5 GHz | 2.5 GHz (same family) | 2.5 GHz (same family) |
| Propagation Delay | 400 ps | 400 ps (same family) | 400 ps (same family) |
| Input Logic Levels | CML, PECL, LVPECL | CML, PECL, LVPECL | CML, PECL, LVPECL |
| Supply Voltage (max) | 5.7 V | 5.7 V | 5.7 V |
主な差別化要因
- Drop-in same-die substitution availability （vs SY55853UKC)
- Broad input logic compatibility （vs SY55853UKI)
- Integrated source-terminated CML outputs （vs Generic ECL latch solutions)
設計ノート
The SY55853UKG features fully differential, source-terminated CML outputs intended to drive 50-ohm transmission lines directly. Route IN/OUT differential pairs with matched lengths and a controlled 100-ohm differential impedance. Keep the distance from latch to next stage short (under 1 inch where possible) to limit edge degradation from the 400 ps propagation delay budget. Do not add series termination resistors on the outputs - source termination is already integrated; adding external resistors will halve the output swing and slow edges.
This part is obsolete, so plan procurement accordingly. Verify remaining-stock date codes and request traceability documentation when buying broker stock, since obsolete high-speed logic is a known counterfeit target. When substituting SY55853UKC or SY55853UKI, confirm the temperature grade suffix against your system requirement before layout release - the family shares die and package, but grade suffixes denote different operating ranges per the manufacturer datasheet. Estimated: even a small board revision to a non-pin-compatible part would require re-verification of all differential trace matching, so prioritize same-family drop-ins.
Place high-frequency decoupling (estimated 0.1 uF ceramic) directly at the supply pin with a low-inductance via to the ground plane; the CML output stage draws fast switching currents at GHz edge rates. Use a solid, unbroken ground reference plane under all differential traces - never route them across plane splits. Inputs accept CML, PECL, and LVPECL, but keep input stub length minimal and use AC or DC termination per the signal source class referenced in the manufacturer datasheet typical application circuits.
コンプライアンス情報
Compliance data not present in the verified web data for this obsolete Micrel/Microchip part; consult Microchip product page or Microchip USA for environmental compliance documentation.
