Micropower comparators of the TS3V339 series. Reference data

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Micropower comparators of the TS3V339 series. Reference data

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When choosing electronic elements and assemblies for assembling, for example, a security system, one of their most important parameters is power consumption in standby mode. If for microcircuits of the CMOS structure it does not exceed, as a rule, a few microwatts, then weak-signal amplifiers, without which, as a rule, not a single electronic watchman can do, consume much more.

To amplify weak signals to the level adopted in CMOS technology, comparators are used - operational amplifiers that generate an output voltage suitable for direct control of digital microcircuits.

The comparators of the TS3V339 chip from THOMSON Microelectronics should be classified as devices of the highest energy efficiency. The typical value of the current consumption of one comparator (there are four of them in one housing) does not exceed 10 μA. An analogue of this microcircuit with two comparators under the name AS3V393 is produced by the Latvian company Alfa.

The device is designed in a plastic case of two design options: for traditional mounting - DIP14 - TS3V339N and AS3V393 (Fig. 1, a) and for surface - SOP14 - TS3V339D (Fig. 1, b). Conclusions - lamellar rigid tinned

The diagram of the internal connections of the device and its pinout are shown in fig. 2, and a simplified circuit diagram of one comparator - in fig. 3. Output - open drain transistor n-MOS.

TS3V339 Series Micro Power Comparators

Main technical characteristics*

Supply voltage, V ...... 2,7 ... 16
Consumed current, uA,
no more ...... 20
typical value......9
Turn-on delay, μs (typical value), with a load resistance of 5,1 kOhm, a load capacitance of 15 pF and an input voltage of 5 mV ...... 2,5
Turn-off delay, μs (typical value), with a load resistance of 5,1 kOhm, a load capacitance of 15 pF and an input signal voltage of 5 mV ...... 1,5
Output saturation voltage, V, no more, with input voltage over 1 V and output current 6 mA......0,5
typical value......0,4
Common-mode input voltage, V, minimum......0
maximum......1,8**
"Zero" bias voltage, mV, not more than......5
Input current, nA (typical value)......1
The difference in the values of the input current of the inverting and non-inverting inputs, pA (typical value)......1
Output leakage current, μA, no more, at an output voltage of 3 V and an input voltage of more than 1 V ...... 1
Common mode rejection ratio, dB (typical value)......70
Supply voltage attenuation coefficient, dB (typical value) ... .70
Operating range of ambient temperature, °C......-40...+85

* For single comparator; at a supply voltage of ZV and an ambient temperature of 25 °C, unless otherwise specified.

** It is equal to the supply voltage minus 1,2V.

When designing a security system, the comparator should be provided in such a mode that its output transistor is closed in standby mode. Then the current through the load will not exceed the output leakage current of the device and the power consumption will be minimal.

It should be noted that there are a number of other energy efficient comparators, such as TS3704, TS861. The domestic industry does not produce such economical comparators; the best of them - 1053CA2 - consumes a current of 1,5 mA.

Author: Yu.Vinogradov, Moscow

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