SY55853UKG - 2.5GHz Differential D-Type Latch | Microchip
料号： SY55853UKG ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1,000 | $4.53 | $4,530.00 |
SY55853UKG 概述
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Design consideration: because the latch is obsolete (no longer manufactured), new designs should select an active Microchip Precision Edge or equivalent part, and existing designs should secure remaining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.
直接替换替代料： SY55853UKG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SY55853UKC
✅ 直接替换📋 参考替代料（不在目录中）
SY55853UKI
✅ 直接替换📋 参考替代料（不在目录中）
SY55853UKG 最大额定值与电气特性
| Logic Function | D-Type Transparent Latch, 1 bit |
| 通道数 | 1 Channel, 1:1 |
| 输出类型 | 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 |
| 封装 | 10-MSOP / 10-TFSOP (0.118 in, 3.00 mm width) |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C |
| Packaging | Tape & Reel (TR suffix) |
| 生命周期状态 | Obsolete (Part Status per distributor) |
SY55853UKG 10-msop / 10-tfsop (0.118 in, 3.00 mm width) 引脚配置指南
SY55853UKG（10-msop / 10-tfsop (0.118 in, 3.00 mm width) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： SY55853UKG.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SY55853UKG 适用于 6 应用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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： SY55853UKG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Drop-in same-die substitution availability （对比 SY55853UKC)
- Broad input logic compatibility （对比 SY55853UKI)
- Integrated source-terminated CML outputs （对比 Generic ECL latch solutions)
设计说明
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.
合规信息
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.
