1. Context

️· Source: Fairchild Semiconductor (now Onsemi) datasheet for a logic device (likely an ACT or a similar type).
️· Purpose: This document outlines the DC electrical characteristics of the device across different voltage (Vcc) and temperature ranges. This data tells engineers what to expect from the device in terms of voltages, currents, and operating limits.

2. Key Information - DC Electrical Characteristics (Initial - Document 1)

️· Voltage Supply (Vcc): The device is tested at multiple supply voltages, likely 4.5V and 5.5V.
️· Temperature Ranges: The data covers three temperature ranges:
- +25°C (Nominal)
- -40°C (Low)
- +85°C (High)
️· Parameters Measured and their Units
- Input Voltage (IH, IL): Volts (V) – The voltages needed for logic HIGH and LOW input states.
- Output Voltage (OH, OL): Volts (V) – The voltages that the device outputs for logic HIGH and LOW conditions.
- Input Leakage Current (IN): Milliamps (mA) – A measure of unwanted current flow into the inputs.
- Quiescent Supply Current (ICC): Milliamps (mA) – The current drawn by the device when it's not actively switching.
- Dynamic Output Current (OLD) Milliamps (mA) - Measures the current from the output of the device.
- ICC/Input: The current drawn from the power supply when the input of the device is actively changing.

3. Changes / Second Document

There is a second table/document provided. Here's a list of the key modifications compared to the first document. The parameters and units remain largely the same.

️· Input High Voltage (VIH/IH): Changed from 1.5V to 2.0V.
️· Input Low Voltage (VIL/IL): Changed from 0.8V to 0.8V.
️· Output High Voltage (VOH/OH): Changed from 4.4 to 4.49 V and then changed to 4.4.
️· Output Low Voltage (VOL/OL): Changed from 0.1 to 0.001 and then to 0.1.
️· Input Leakage Current: Changed from ±1.0 to 10.0.
️· ICC/Input: Changed from 1.5 to 0.6.

4. Notes

️· Note 6: All output loads are assumed to be loaded in the test.
️· Note 6: Max test duration is 2.0 ms.



5. Implications & Significance

️· Device Operation: The parameters dictate how the device must be biased to function correctly. Input voltage levels must be within the VIH and VIL ranges for proper logic. Output voltage levels define the signal strength.
️· System Design: Engineers use these characteristics to ensure a circuit works as expected. They factor in voltage drops, noise margins, and worst-case conditions when designing a larger system.
️· Reliability: The specified limits ensure the device is reliable and doesn't fail under normal operating conditions.