Texas Instruments
BAW-based network synchronizer, 1 DPLL + 2 APLLs, 50 fs RMS jitter, 8 outputs, VQFN-48
The Texas Instruments LMK05318B is an ultra-low-jitter single-channel network synchronizer clock with an integrated BAW VCO. It combines one DPLL with two APLLs, supports hitless switching, digital holdover and sub-ppt DCO steering for IEEE 1588 PTP, and drives eight outputs in AC-LVPECL, AC-CML, AC-LVDS, HCSL or 1.8 V LVCMOS formats, including PCIe-compliant clocks. Typical applications are SyncE/PTP line cards, switches, routers, wireless baseband and optical transport. Current lead time is around 26 weeks with authorized stock constrained; Cerametronics can locate traceable stock.
Key Specifications
Verify against the original datasheet before quoting.
| Architecture | 1 DPLL + 2 APLLs (APLL1 BAW VCO); 2 reference inputs, 8 clock outputs |
|---|---|
| RMS Phase Jitter (12 kHz–20 MHz) | 50 fs typ / 80 fs max at 312.5 MHz AC-LVPECL; 60 fs typ / 90 fs max at 156.25 MHz |
| Output Frequency | Differential up to 1250 MHz; HCSL up to 625 MHz; 1.8 V LVCMOS up to 200 MHz; 1PPS on OUT7 |
| Supply Voltage | VDD 3.135 V to 3.465 V (3.3 V nominal); output supplies 1.8 V / 2.5 V / 3.3 V |
| Operating Temperature (TA) | -40 to +85 °C ambient (TJ max 125 °C recommended) |
| Package | VQFN-48 (RGZ), 7.0 x 7.0 mm body, exposed thermal pad |
Market Status
Extended Lead Time – Traceable Stock on Request Factory lead time is currently around 26 weeks.
Quality & Traceability
Cerametronics is ISO 9001 certified and products are RoHS compliant, with counterfeit screening and full traceability on every shipment. A Certificate of Conformance is available on request. For allocation-sensitive or high-risk lots, independent third-party lab verification can be arranged — just flag it on your RFQ. Any lot that fails incoming inspection is quarantined and never shipped.
FAQ
What is the difference between LMK05318BRGZR and LMK05318BRGZT?
Both are the same silicon in the same 7 x 7 mm VQFN-48 RGZ package. The R suffix is the large tape-and-reel orderable; the T suffix is TI's small-reel orderable used for prototypes and small runs. Either can be substituted when the other is unavailable.
Is the older LMK05318 or the -Q1 version a drop-in for the LMK05318B?
The LMK05318B is the improved successor of the LMK05318 in the same RGZ footprint; TI positions LMK05318B as the current device, so configuration files should be regenerated in TICS Pro before swapping. LMK05318BTRGZRQ1 is the AEC-Q100 automotive version rated -40 to +105 °C in the same package, so it can cover commercial demand at a higher price.
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