AS1970 - AS1975

Low-Voltage Single/Dual/Quad Comparators

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1 General Description

The AS1970 - AS1975 are single/dual/quad compara-

tors that operate with supplies from 2.5 to 3.6V making

them perfect for all 3 volt applications. The comparators

can also operate with dual supplies (±1.25 to ±1.8V),

and require very little supply current (8.5µA) with mini-

mal propagation delay (300ns).

Low input bias current (1.0pA, typ), low input offset volt-

age (0.5mV, typ), and internal hysteresis (3mV) make

these comparators ideal for low-power single-cell appli-

cations including power-management and power-moni-

toring systems.

The comparators are available as the standard products

listed in Table 1.

The AS1970/AS1972/AS1974 push/pull output can sink

or source current.

The AS1971/AS1973/AS1975 open-drain output can be

open-drain versions are ideal for logic-level translators

or bipolar-to-unipolar converters.

Large internal output drivers allow Rail-to-Rail output

swings with loads of up to 8mA.

The AS1970/AS1971 are available in a 5-pin SOT23

package. The AS1972/AS1973 are available in a 8-pin

MSOP package. The AS1974/AS1975 are available in a

14-pin TSSOP package.

Figure 1. Block Diagrams

2 Key Features

!

CMOS Push/Pull Output Sinks and Sources 8mA

(AS1970/AS1972/AS1974)

!

CMOS Open-Drain Output Voltage Extends Beyond

!

Quiescent Supply Current: 8.5µA per Comparator

!

Internal Hysteresis: 3mV

!

Single-Supply Operation: 2.5 to 3.6V

!

Common-Mode Input Voltage Range Extends

250mV Above the Rails

!

Low Propagation Delay: 300ns

!

Minimized Overall Power Consumption

!

Supply Current @1MHz Switching Frequency: 80µA

!

No Phase Reversal for Overdriven Inputs

!

Package Types:

- 5-pin SOT23 – AS1970/AS1971

- 8-pin MSOP – AS1972/AS1973

- 14-pin TSSOP – AS1974/AS1975

3 Applications

The devices are ideal for battery-powered systems,

mobile communication devices, zero-crossing detectors,

window comparators, threshold detectors/discrimina-

tors, ground/supply-sensing applications,

IR receivers or any other space-limited application with

low power-consumption requirements.

Table 1. Standard Products

Model

Output Type

AS1970/AS1972/AS1974

Push/Pull

AS1971/AS1973/AS1975

Open-Drain

–

+

–

+

–

+

–

+

OUTA

INA+

INA-

OUTD

IND+

IND-

OUTC

INC+

INC-

OUTB

INB+

INB-

AS1974/AS1975

INA+

INA-

–

+

OUTA

INB+

INB-

–

+

OUTB

AS1970/AS1971

IN+

IN-

–

+

OUT