PRL-260NT Programmable NECL/TTL Frequency Divider (Discontinued)

Basic Lab Tools > Frequency Dividers > PRL-260

The PRL-260NT has been replaced by the new PRL-260ANT. We are no longer taking orders for the PRL-260NT. Information contained on these pages is for information only.

Migration information:

• The PRL-260ANT provides equivalent or superior functionality to the PRL-260NT except that it does not provide an undivided f output. The f output of the PRL-260NT has been replaced by the Φ2 output in the PRL-260ANT. If you require an undivided signal, a PRL-431N or PRL-414B fanout may be used to fan out your signal before it enters the PRL-260ANT.
• The PRL-260ANT provides a higher typical f_max, higher maximum division ratios, lower channel-to-channel skew, lower TTL input threshold, and a second semi-independent Φ2 output. The PRL-260ANT is also 2" shorter in length.
• Please contact support@pulseresearchlab.com for application migration support

Applications:

• Systems clock simulation
• Low-jitter NECL/TTL clock source
• SONET clock generator
• An Essential Lab Tool for Working with TTL/CMOS and ECL Circuits

Features:

• f/2 to f/256, manually programmable, or square wave outputs to f/512
• Single-ended NECL, differential NECL, or sinewave inputs with internal 50 Ω/V_TT termination
• f/n and f/n NECL Outputs with internal pull-down
• Additional TTL Input and f, f NECL outputs
• 20 ps typical Edge Jitter
• 50 ps typical skew between f/n & f/n NECL outputs
• 200 ps typical skew between f/n & f/n TTL outputs
• 1.15 GHz typical maximum external clock input frequency 
• Complementary NECL Outputs drive 50 Ω loads 
  terminated to V_TT, AC-coupled or floating 50 Ω loads 
• Complementary TTL Outputs drive long lines with or 
  without 50 Ω load terminations
• DC coupled I/O's
• Ready-to-Use module includes a ±8.5 V AC/DC Adapter

Description

The PRL-260NT is an 8-Bit, manually programmable frequency divider capable of running at input clock frequencies in excess of 1 GHz. A NECL input is logically OR-ed with a secondary TTL input. Complementary NECL and TTL f/n outputs are provided, as well as complementary NECL f/1 output. A signal applied to either the NECL or TTL input is divisible by any number between 2 and 256 using D1 through D8 of the DIP switch. D9 divides the f/n outputs further by 2 for f/2n square outputs. A logic Hi applied to either input disables the divider function.

The NECL input can accept either single-ended NECL, differential NECL, or sinewave signals, selectable by a switch, and has internal 50 Ω/ V_TT terminations, where V_TT is -2 V for NECL. The TTL input has a ground-referenced 50 Ω termination and the minimum signal required is only 1 V.

The NECL output is designed for driving 50 Ω loads terminated into V_TT, and can also drive AC coupled or floating 50 Ω loads. The complementary 50 Ω back terminated TTL outputs can drive long 50 Ω lines with or without terminations.

Applications of the PRL-260 frequency divider includes precision clocks for high speed digital systems, low jitter clock source for testing A/D's, SONET clock generator, general purpose frequency division and Basic Lab Tool for working with NECL and TTL circuits. Each model is housed in a 1.3 x 2.9 x 8-in. extruded aluminum enclosure and is supplied with a ±8.5 V AC/DC adapter.

Related BLT's:

• PRL-414B, 1:4 TTL Fanout Buffer
• PRL-431N/P, 1:2 NECL/PECL Fanout Buffer
• PRL-550 Series, NECL/PECL Terminators/Translators
• PRL-470A, Variable Output Pulse Driver

Accessories

• PRL-SC-104, DC Block, 0.1 µf
• PRL-SC-225, DC Block, 2.2 µf
• PRL-FTC-104, Feedthru Decoupling Cap, 0.1 µf
• PRL-FTR-50, Feedthru 50 Ω Termination
• PRL-ACT-50, Dual Ch. AC Coupled 50 Ω Termination 
• PRL-ACX-12dB, AC Coupled 12dB (4X) Attenuator
• Mounting Brackets, for mounting to flat surfaces
• Voltage Distribution Modules, for sharing AC adapters among multiple modules
• Cables, various lengths of RG-174 50 Ω coax with SMA plugs

Detail | Diagram | Specifications | Datasheet | DivisorTable.xls