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Product Detailed Parameters
- Description：IC COMPARATOR 4 GEN PUR 14TSSOP
- Series：-
- Mfr：ams-OSRAM USA INC.
- Package：Tube
- Type：General Purpose
- Number of Elements：4
- Output Type：Open-Drain
- Voltage - Supply, Single/Dual (±)：2.5V ~ 5.5V, ±1.25V ~ 2.75V
- Voltage - Input Offset (Max)：6mV @ 5.5V
- Current - Input Bias (Max)：1pA @ 5.5V
- Current - Output (Typ)：-
- Current - Quiescent (Max)：64µA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：400ns
- Hysteresis：±3mV
- Operating Temperature：-40°C ~ 85°C
- Package / Case：14-TSSOP (0.173", 4.40mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：14-TSSOP
- Grade：-
- Qualification：-
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Overview
The AS1975 is a quad low-voltage comparator manufactured by ams-OSRAM USA INC. It operates on single supplies from 2.5V to 5.5V or dual supplies of ±1.25V to ±2.75V. The device features an open-drain output stage capable of pulling beyond VCC up to 5.5V > VEE, making it suitable for logic-level translation. Key electrical characteristics include a typical quiescent supply current of 64µA per quad at 5V, a propagation delay of 300ns to 400ns, and an internal hysteresis of 3mV. It is housed in a 14-pin TSSOP package.
Feature Summary
- Quad configuration with open-drain outputs that extend voltage capability beyond the positive supply rail.
- Low power consumption with minimal supply current requirements suitable for battery-powered systems.
- Internal hysteresis ensures clean switching transitions even with slow input signals.
- Common-mode input voltage range extends 250mV above and below the supply rails.
Applications
- Logic level translators between 3V and 5V systems
- Zero-crossing detectors
- Threshold detectors and discriminators
- Window comparators
Procurement Notes
Verify the specific ordering suffix (e.g., -T for tape and reel) against the manufacturer's current datasheet revision. Confirm the package type matches the 14-pin TSSOP specification. Ensure the open-drain output requirement aligns with the external pull-up resistor design necessary for this variant.
Selection Notes
Select the AS1975 when a quad comparator with open-drain outputs is required for interfacing different logic voltage levels. This model is appropriate for applications needing rail-to-rail input capability and low power consumption. Compare against push-pull variants like the AS1974 if active sourcing current is needed instead of passive pull-up.
Part Context
The AS1975 belongs to the AS1970-AS1975 family of low-voltage comparators originally developed by austriamicrosystems AG, now ams AG. This series provides single, dual, and quad configurations with varying output stages. The AS1975 specifically offers the quad channel count with open-drain outputs, distinguishing it from the push-pull AS1974.
Replacement Considerations
The AS1974 serves as a functional substitute within the same family but utilizes a push-pull output stage rather than open-drain. Verify that the system design can accommodate the lack of active high-side drive when substituting the AS1974 for the AS1975.
FAQ
Can the AS1975 output voltage exceed the VCC supply?
Yes, the open-drain output can be pulled beyond VCC to a maximum of 5.5V greater than VEE using an external pull-up resistor.
What is the common-mode input voltage range?
The common-mode input voltage range extends 250mV above and below the supply rails, allowing operation even when inputs are slightly outside the supply voltage.
