NB2308AI1HDR2G

Overview

The NB2308AI1HDR2G is a 3.3 V zero delay clock buffer manufactured by onsemi, utilizing advanced 0.35 µm CMOS technology. It features an internal phase-locked loop (PLL) that locks to a reference input on the REF pin, with feedback provided via the FBK pin. The device provides eight buffered outputs divided into two banks of four, controlled by select inputs S1 and S2. It supports input frequencies from 15 MHz to 133 MHz and operates within a supply voltage range of 3.0 V to 3.6 V. Designed for industrial applications, it functions between -40°C and +85°C. The part is housed in a 16-pin TSSOP package and is supplied in tape and reel format.

Feature Summary

• Zero input-to-output propagation delay adjustable by capacitive load on the FBK input.
• Output-to-output skew guaranteed less than 200 ps; device-to-device skew less than 700 ps.
• Cycle-to-cycle jitter less than 200 ps at 66.67 MHz with 15 pF load.
• Two banks of four outputs each, three-stateable via select inputs S1 and S2.

Applications

• Distribution of high-speed clocks in communication systems.
• Clock buffering for processors and memory interfaces.
• System testing requiring direct application of input clock to outputs.

Procurement Notes

Verify the ordering suffix 'R2G' corresponds to the 16-TSSOP package in tape and reel configuration with lead-free composition. Confirm the 'I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure compatibility with the specific NB2308Ax1H high-drive output configuration before procurement.

Selection Notes

Select this variant for industrial temperature environments requiring the NB2308Ax1H high-drive performance. The 'R2' suffix specifies tape and reel packaging suitable for automated assembly. Verify that the application requires the specific frequency multiplication or division characteristics defined by the NB2308Ax1 configuration where output frequencies equal the reference.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. The 'I' suffix denotes the industrial temperature grade, while 'H' indicates the high-drive version with faster rise and fall times. The 'DT' suffix identifies the 16-pin TSSOP package, and 'R2' specifies the tape and reel shipping method.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer for current alternatives as the NB2308A series may have been superseded by newer product lines.

FAQ

How is zero input-to-output delay achieved?

Zero delay is achieved when all outputs, including the one driving the FBK pin, are uniformly loaded. Adjustments can be made by varying the capacitive load difference between the FBK pin and the other outputs.

What is the function of the Select Inputs S1 and S2?

S1 and S2 control the state of the output banks. Setting both to logic low three-states all outputs and shuts down the PLL. Other combinations enable specific banks or bypass the PLL to drive outputs directly from the reference.

What is the maximum operating frequency?

The device supports an input frequency range up to 133 MHz, with a maximum output frequency specification of 133.3 MHz under standard loading conditions.