ALD2321APCL

Overview

The ALD2321APCL is a monolithic precision dual voltage comparator utilizing advanced silicon gate CMOS technology and on-chip e-trim (EPAD) technology. It features ultra-low offset voltage, high input impedance, and flexible complementary output drivers. The device operates on a single +5V or dual ±5V supply with low power consumption. Key electrical parameters include a maximum input offset voltage of 0.2mV, typical input bias current of 0.01pA, and supply current of 110µA. It supports a supply voltage range of 4V to 10V, offers a response time of 1.1µs for a 5mV step, and provides a sink output current capability of up to 50mA.

Feature Summary

• Ultra-low signal detection capability down to 4fW using EPAD electronic trimming technology
• Dual complementary outputs allowing configurable push-pull, open-drain, or wired-OR modes
• High-speed resolution of signals as low as 1mV without requiring external amplification
• CMOS, NMOS, and TTL compatible logic levels with fanout of 30 TTL loads

Applications

• Dual limit window comparators
• Power supply voltage monitoring
• Photo-detector sensor circuits
• Relay or LED driver circuits
• Battery operated instruments

Procurement Notes

Verify the specific suffix 'PCL' corresponds to the 16-pin Plastic DIP package when sourcing. Confirm RoHS compliance status as standard versions may vary by manufacturing date. Ensure the ordering code matches the required temperature grade (0°C to +70°C). Check for lead-free designation if environmental regulations apply to the target assembly process.

Selection Notes

Select this component for applications requiring direct detection of microvolt-level signals from high-impedance sources. The dual complementary output structure allows driving both NPN bipolar bases and N-channel MOSFET gates simultaneously. Consider the 50mA sink current capability for direct load driving. Verify that the 4V to 10V supply range aligns with the system power architecture.

Part Context

This part belongs to the ALD2321 family of ultra-low Vos EPAD dual CMOS analog voltage comparators. The 'A' suffix indicates a tighter offset voltage specification compared to the 'B' or standard variants. The 'PCL' suffix designates the 16-pin plastic DIP package with lead-free construction. It serves as a high-precision alternative to multi-stage amplifier-comparator solutions.

Replacement Considerations

ALD2321BPCL: Offers a higher maximum input offset voltage of 0.5mV while maintaining the same package and pinout.

FAQ

How does the ALD2321APCL handle ground-referenced signals?

The input voltage includes ground, making it ideal for single-supply (+5V) systems. For dual supplies, the GND pin connects to the most negative supply rail.

What is the function of the VE pins?

VE11, VE12, VE21, and VE22 are factory trim pins for offset voltage adjustment. They should normally be left unconnected but can be used for positive/negative feedback to provide hysteresis.

Can the outputs drive capacitive loads directly?

Yes, but the DC current levels at the output will be very low (leakage levels) when driving capacitive loads, which serves as a power-saving feature.