Overview
The LMC7221AIM5X/NOPB is a micropower CMOS comparator produced by Texas Instruments. It is available in a space-saving 5-Pin SOT-23 package, making it ideal for space and weight critical designs. This comparator is also available in an 8-Pin SOIC package. The LMC7221 is characterized by its low power consumption, high speed, and rail-to-rail input capability, making it versatile for various applications.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Input Offset Voltage (VOS) | V+ = 5V | 3 mV | 8 mV (max) |
| Input Offset Voltage Temperature Drift (TCVOS) | V+ = 5V | 1.0 μV/°C | |
| Input Current (IB) | 0.04 pA | ||
| Common Mode Rejection Ratio (CMRR) | V+ = 5.0V | 75 dB | |
| Supply Current (IS) | VOUT = Low | 7 μA at 5V | 14 μA (max) |
| Response Time | V+ = 5V | 4 μs | |
| Output Voltage Low (VOL) | ILOAD = 2.5 mA | 0.2 V | 0.4 V (max) |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Tiny 5-Pin SOT-23 package saves space, with a thickness of less than 1.43 mm.
- Ensured specifications at 2.7V, 5V, and 15V supplies.
- Typical supply current of 7 μA at 5V.
- Response time of 4 μs at 5V.
- Open drain output that can be pulled up to a voltage higher or lower than the supply voltage.
- Input common-mode range beyond V− and V+.
- Low input current.
Applications
- Mixed voltage battery-powered products.
- Notebooks and PDAs.
- PCMCIA cards.
- Mobile communications.
- Alarm and security circuits.
- Driving low current LEDs.
- Direct sensor interface.
Q & A
- What is the typical supply current of the LMC7221 at 5V? The typical supply current is 7 μA at 5V.
- What is the response time of the LMC7221 at 5V? The response time is 4 μs at 5V.
- What are the available package types for the LMC7221? The LMC7221 is available in 5-Pin SOT-23 and 8-Pin SOIC packages.
- What is the input common-mode range of the LMC7221? The input common-mode range is beyond V− and V+.
- Can the LMC7221 drive LEDs? Yes, the LMC7221 can drive small, high-efficiency LEDs with a 5-volt power supply.
- What is the operating temperature range of the LMC7221? The operating temperature range is -40°C to 85°C.
- How does the open drain output of the LMC7221 work? The open drain output can be pulled up with a resistor to a voltage which can be higher or lower than the supply voltage.
- What are some common applications of the LMC7221? Common applications include mixed voltage battery-powered products, notebooks, PDAs, PCMCIA cards, mobile communications, alarm and security circuits, and driving low current LEDs.
- How does the LMC7221 protect against input voltage exceeding the common mode range? Large value input resistors and additional protection devices like diodes can be used to protect against input voltage exceeding the common mode range.
- What is the significance of the rail-to-rail input capability of the LMC7221? The rail-to-rail input capability allows the comparator to operate effectively in mixed voltage systems.
