NB2308AI2DT

Overview

The NB2308AI2DT is a 3.3 V zero delay clock buffer from the NB2308A family, designed for high-speed clock distribution. It features an on-chip PLL that locks to a reference input on the REF pin, with feedback driven to the FBK pin. The device provides eight outputs divided into two banks of four, controlled by select inputs S1 and S2. It supports input frequencies from 15 MHz to 133 MHz. Input-to-output propagation delay is less than 250 ps, and output-to-output skew is guaranteed at less than 200 ps. It operates within a supply voltage range of 3.0 V to 3.6 V and is housed in a TSSOP-16 package.

Feature Summary

• Zero delay buffer with adjustable input-to-output propagation delay via capacitive load on the FBK input
• Configurable frequency multiplication: Bank A outputs operate at 2X reference frequency when feedback is sourced from Bank B
• Low-skew performance with output-to-output skew under 200 ps and device-to-device skew under 700 ps
• Two banks of four outputs each, allowing independent three-stating via S1 and S2 select inputs

Applications

• High-speed clock distribution systems requiring low skew
• Multi-device synchronization where inter-device skew must be minimized
• Systems requiring configurable frequency multiplication (2X) on specific output banks
• Test and measurement equipment utilizing direct input bypass mode

Procurement Notes

Verify the industrial temperature rating (-40°C to +85°C) and TSSOP-16 packaging configuration. Confirm the specific 'I2' functional variant matches the required 2X frequency multiplication logic on Bank A. Ensure the design accounts for the weak pullup on select inputs and weak pulldown on outputs as specified in the datasheet.

Selection Notes

Select this part when a 2X frequency multiplier is needed specifically on Bank A while maintaining reference frequency on Bank B. Compare against NB2308AI2D if SOIC-16 packaging is preferred over TSSOP-16. Consider NB2308AI4DT if 2X frequency is required on all outputs simultaneously rather than just one bank.

Part Context

This component belongs to the NB2308A series of 3.3 V zero delay buffers. The 'I' suffix denotes the industrial temperature range, '2' specifies the 2X/Reference configuration, 'D' indicates the SOIC/TSSOP compatible footprint type, and 'T' identifies the TSSOP-16 package variant.

Replacement Considerations

NB2308AI2D serves as the equivalent part in SOIC-16 packaging. NB2308AI2DR2G is the tape-and-reel version of the same electrical device.