1. Overview:

️· Product: ICS83940I-01 Hiperclocks fanout buffer.
️· Function: A buffer designed to distribute signals, likely clock signals, from a LVPECL (Low Voltage Positive Emitter Coupled Logic) source to LVCMOS (Low Voltage CMOS) or LVTTL (Low Voltage TTL) outputs.
️· Document Type: Partial datasheet – specifically, sections dealing with Absolute Maximum Ratings, DC Characteristics, and AC Characteristics.
️· Revision: Rev. A, March 1, 2004.
️· Website: www.icst.com/products/hiperclocks.html

2. Key Sections and Their Contents:

️· Absolute Maximum Ratings: Defines the limits for operating conditions that should *not* be exceeded. Exceeding these ratings can cause permanent damage.
- Supply Voltage (V DD): 3.6V
- Input Voltage (V I): -0.3V to V DD + 0.3V
- Output Voltage (V O): -0.3V to V DDO + 0.3V (V DDO being an output supply voltage)
- Input Current (I IN): ±20mA
- Storage Temperature (T STG): -40°C to 125°C

️· DC Characteristics (Table 4A): Specifies the static electrical characteristics of the device.
- V H I: Input High Voltage (minimum required for logic high)
- V L I: Input Low Voltage (maximum voltage for logic low)
- V P P: Peak-to-Peak Voltage (related to signal swing)
- V R M C: Common Mode Voltage (Important for proper signal level)
- I N I: Input Current
- V H O: Output High Voltage
- V L O: Output Low Voltage
- I D D: Supply Current (current drawn from the power supply)
- Note 1: Clarifies the input voltage limits for the PCLK and nPCLK signals in a "nickel-ended" application (likely referring to a specific termination scheme).
- Note 2: Defines common-mode voltage.

️· AC Characteristics (Table 5A): Deals with the timing characteristics of the device. (The table itself is incomplete in the provided text; it likely lists propagation delays, rise/fall times, etc.)
- Summary: Indicates an incomplete table is coming in the next section.

Important Terms/Abbreviations:

️· LVPECL: Low Voltage Positive Emitter Coupled Logic – a high-speed logic family.
️· LVCMOS: Low Voltage CMOS – a common logic family.
️· LVTTL: Low Voltage TTL – another common logic family.
️· V DD: Positive supply voltage.
️· V DDO: Output supply voltage.
️· PCLK: Phase Clock
️· nPCLK: Negative Phase Clock

Overall Purpose of the Document:

This excerpt is part of the documentation intended for engineers designing systems that use the ICS83940I-01. It provides critical information about the device's electrical limits and characteristics, allowing designers to ensure proper operation and avoid damage.