LVCMOS Zero Delay Buffer

NOTICE - The following device(s) are recommended alternatives:

The FCT388915T uses phase-lock loop technology to lock the frequency and phase of outputs to the input reference clock. It provides low skew clock distribution for high performance PCs and workstations. One of the outputs is fed back to the PLL at the FEEDBACK input resulting in essentially zero delay across the device. The PLL consists of the phase/ frequency detector, charge pump, loop filter and VCO. The VCO is designed for a 2Q operating frequency range of 40MHz to f2Q Max. The FCT388915T provides 8 outputs, the Q5 output is inverted from the Q outputs. The 2Q runs at twice the Q frequency and Q/2 runs at half the Q frequency. The FREQ_SEL control provides an additional ÷ 2 option in the output path. PLL _EN allows bypassing of the PLL, which is useful in static test modes. When PLL_EN is low, SYNC input may be used as a test clock. In this test mode, the input frequency is not limited to the specified range and the polarity of outputs is complementary to that in normal operation (PLL_EN = 1). The LOCK output attains logic HIGH when the PLL is in steady-state phase and frequency lock. When OE/RST is low, all the outputs are put in high impedance state and registers at Q, Q and Q/2 outputs are reset. The FCT388915T requires one external loop filter component as recommended in Figure 3.

Features

  • 0.5 MICRON CMOS Technology
  • Input frequency range: 10MHz – f2Q Max. spec
  • (FREQ_SEL = HIGH)
  • Max. output frequency: 150MHz
  • Pin and function compatible with FCT88915T, MC88915T
  • 5 non-inverting outputs, one inverting output, one 2x output,
  • one ÷2 output
  • all outputs are TTL-compatible
  • 3-State outputs
  • Duty cycle distortion < 500ps (max.)
  • 32/–16mA drive at CMOS output voltage levels
  • VCC = 3.3V ± 0.3V
  • Inputs can be driven by 3.3V or 5V components
  • Available in 28 pin PLCC and SSOP packages

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
74FCT388915TBJG Active PLG28 PLCC 28 C Yes Tube Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
74FCT388915T Datasheet Datasheet PDF 339 KB Mar 9, 2016
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 10, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 12, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 5, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB May 31, 1996
AN-154: Estimating Power Dissipation in CMOS Application Note PDF 30 KB May 31, 1996
AN-154: Estimating Power Dissipation in CMOS Application Note PDF 30 KB May 31, 1996
AN-82 Clock Distribution with Guaranteed Skew Application Note PDF 146 KB May 31, 1996
AN-155 PLL Clock Generators Application Note PDF 67 KB May 31, 1996
PCNs & PDNs
PDN#: N-16-02 PRODUCT DISCONTINUANCE NOTICE ON SELECT DEVICES Product Discontinuation Notice PDF 161 KB Mar 6, 2016
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 21, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 20, 2015
PDN# : N-12-22R2 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 363 KB Jun 13, 2013
PDN# : N-12-22R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 209 KB Feb 27, 2013
PCN# W1002-01(R5) Product Change Notice PDF 820 KB Jun 21, 2011
PCN# W1002-01(R4) Product Change Notice PDF 377 KB Oct 4, 2010
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 15, 2002
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 5, 2006
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 13, 2004
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 13, 2012
PCN# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 1, 2005
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 10, 2001
PCN#:A-0312-02, new die attach material - 8290 Product Change Notice PDF 116 KB Dec 2, 2003
PCN#:A-0312-01, new mold compound material - G600 Product Change Notice PDF 109 KB Dec 2, 2003
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 9, 2003
PCN # L-0503-04 Part Number Change Product Change Notice PDF 85 KB Mar 27, 2005
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 28, 2005
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 17, 1999
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 15, 2005
PCN# L0203-09R1 Tech Upgrade & Fab Transfer Product Change Notice PDF 98 KB May 28, 2003
PCN # L0203-09R2 Addendum Fab Transfer from Fab 2 to Fab 4 Product Change Notice PDF 101 KB Aug 15, 2004
PCN#: A-0309-04, new mold compound G600 material Product Change Notice PDF 134 KB Oct 6, 2003
Other
The IDT Consumer Products Advantage Overview PDF 4.01 MB Jun 30, 2017
The IDT Automotive Advantage Overview PDF 3.55 MB May 26, 2017
The IDT Communications Products Advantage Overview PDF 2.54 MB Feb 13, 2017
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016

Software & Tools

Title Other Languages Type Format File Size Date
74FCT388915T IBIS Model Model - IBIS ZIP 9 KB Apr 15, 1997

News & Additional Resources