General Description

The ispClock5300S is an in-system-programmable zero delay universal fan-out buffer for use in clock distribution applications. The ispClock5312S, the first member of the ispClock5300S family, provides up to 12 single-ended ultra low skew outputs. Each pair of outputs may be independently configured to support separate I/O standards (LVTTL, LVCMOS -3.3V, 2.5V, 1.8, SSTL, HSTL) and output frequency. In addition, each output provides independent programmable control of termination, slew-rate, and timing skew. All configuration information is stored on-chip in non-volatile E2CMOS® memory.

Features

■ Four Operating Configurations
• Zero delay buffer
• Zero delay and non-zero delay buffer
• Dual non-zero delay buffer
• Non-zero delay buffer with output divider
■ 8MHz to 267MHz Input/Output Operation
■ Low Output to Output Skew (<100ps)
■ Low Jitter Peak-to-Peak (< 70 ps)
■ Up to 20 Programmable Fan-out Buffers
• Programmable single-ended output standards and individual enable controls
- LVTTL, LVCMOS, HSTL, eHSTL, SSTL
• Programmable output impedance
- 40 to 70Ω in 5Ω increments
• Programmable slew rate
• Up to 10 banks with individual VCCO and GND
- 1.5V, 1.8V, 2.5V, 3.3V
■ Fully Integrated High-Performance PLL
• Programmable lock detect
• Three “Power of 2” output dividers (5-bit)
• Programmable on-chip loop filter
• Compatible with spread spectrum clocks
• Internal/external feedback
■ Precision Programmable Phase Adjustment (Skew) Per Output
• 8 settings; minimum step size 156ps
- Locked to VCO frequency
• Up to +/- 5ns skew range
• Coarse and fine adjustment modes
■ Up to Three Clock Frequency Domains
■ Flexible Clock Reference and External Feedback Inputs
• Programmable single-ended or differential input reference standards
- LVTTL, LVCMOS, SSTL, HSTL, LVDS, LVPECL, Differential HSTL, Differential SSTL
• Clock A/B selection multiplexer
• Programmable Feedback Standards
- LVTTL, LVCMOS, SSTL, HSTL
• Programmable termination
■ All Inputs and Outputs are Hot Socket Compliant
■ Full JTAG Boundary Scan Test In-System Programming Support
■ Exceptional Power Supply Noise Immunity
■ Commercial (0 to 70°C) and Industrial (-40 to 85°C) Temperature Ranges
■ 48-pin and 64-pin TQFP Packages
■ Applications
• Circuit board common clock distribution
• PLL-based frequency generation
• High fan-out clock buffer
• Zero-delay clock buffer