SN74LVC1G11: SN74LVC1G11DCKR interface with SN74LVC1GU04DBVR

Vidhya J

Part Number: SN74LVC1G11

Tool/software:

Hi Team,

I am interfacing AND gate (SN74LVC1G11DCKR) Output to a NOT gate(SN74LVC1GU04DBVR) input.

component 1

VOH1 (min)
(V)

VOL1
(MAX)
(V)

VIH1
(MIN)
(V)

VIL1
(MAX)
(V)

Component 2

VOH2
(min)
(V)

VOL2
(MAX)
(V)

VIH2
(MIN)
(V)

VIL2
(MAX)
(V)

Interface 1-2 Compatibility
CONDITION1
VOH1(MIN) > VIH2(MIN)

Interface 1-2
Compatibility
CONDITION2
VIL2(MAX) > VOL1(MAX)

Interface 2-1 Compatibility
CONDITION1
VOH2(MIN) > VIH1(MIN)

Interface 2-1
Compatibility
CONDITION2
VIL1(MIN) > VOL2(MAX)

SN74LVC1G11DCKR
(3 INPUT AND)

2.4

0.55

0.8

SN74LVC1GU04DBVR
(1 bit NOT)

2.4

0.55

2.475

0.825

FALSE

TRUE

I see compatibility issue for 1st case.

How to approach this?

Thanks,

Vidhya

0 Clemens Ladisch 20 days ago

Guru 272300 points

For CMOS devices, using the specified V_OL/V_OH values without adjusting for the actual output current does not make sense. (See [FAQ] What is the output voltage (VOH or VOL) when the output current is X or the supply voltage is Y?)

When connected to a high-impedance CMOS input, the actual output voltage will be at V_CC or GND.

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