AM2431: AM2431

Anandhu Vs

Part Number: AM2431

Hi Team

We are using AM2431 in our design, we have shortlisted the PSRAMs with both 3.3V and 1.8V supply voltage to interface with the MCU. During the Noise margin analysis we came to know that all those PSRAMs are failing since the VOH(min) margin is less for the MCU. Need your thoughts here.

Can you please suggest any PSRAMs with parallel interface which can be interfaced with AM2431 MCU.

SL/NO	SOURCE							DESTINATION							Check status
SL/NO	PART	Supply Voltage Rail	Supply Voltage(V)	VOH(MIN)	VOH(MAX)	VOL(MIN)	VOL(MAX)	PART	Supply Voltage Rail	Supply Voltage (V)	VIH(MIN)	VIH(MAX)	VIL(MIN)	VIL(MAX)	Supply Voltage	High Volatge Level	Low Voltage Level	STATUS
1	AM2431BSDFHIALVR	1V8	1.8	1.35	1.8	0	0.45	AS1C8M16PL-70BIN	1V8	1.8	1.4	2	-0.2	0.4	TRUE	FALSE	FALSE	NOT OK
2	AM2431BSDFHIALVR	1V8	1.8	1.35	1.8	0	0.4	IS66WVE4M16EBLL-70BLI	1V8	1.8	1.4	2	-0.2	0.4	TRUE	FALSE	TRUE	NOT OK
3	AM2431BSDFHIALVR	3v3	3.3	2.4	3.3	0	0.4	IS67WVE4M16EBLL-70BLA1	3V3	3.3	2.9	3.5	-0.2	0.4	TRUE	FALSE	TRUE	NOT OK

Regards

A V S

over 1 year ago

0 Kallikuppa Sreenivasa over 1 year ago

TI__Guru**** 191159 points

Hello AVS,

Thank you for the query.

I am looking into the query and will have to reach out internally with the device experts.

Please expect delay in response.

Regards,'

Sreenivasa

0 Anandhu Vs over 1 year ago in reply to Kallikuppa Sreenivasa

Prodigy 75 points

Dear Sreenivasa

We would like to hear from you on this at the earliest. Thank you for understanding.

Regards
AVS

0 Kallikuppa Sreenivasa over 1 year ago in reply to Anandhu Vs

TI__Guru**** 191159 points

Hello AVS,

Thank you for the follow-up, I answered similar query.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1348811/am2431-psram-compatibility-with-mcu

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa over 1 year ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 191159 points

Hello AVS

Please refer additional inputs from the expert that could help perform the required analysis

Customer would need to use SOC IBIS models with the actual load applied to the output if they needed
to know our VOL or VOH at any load other than 3mA. The customer effectively needs to do the same with the PSRAM IBIS model
to determine what is VOL and VOH levels of that device under realistic operating conditions.

VOL and VOH are typically defined for a specific current.
For example, we define SOC 1.8V LVCMOS VOL and VOH values with a 3mA load.
SOC low output voltage will be equal to or less than the worst case value of 0.45V defined in the datasheet with a 3mA load and
will begin to approach VSS as you reduce the load current.
SOC high output voltage will be equal to or greater than the worst case value of (VDD-0.45V) defined in the datasheet with a 3mA load
and will begin to approach VDD as you reduce the load current.

Regards,

Sreenivasa

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AM2431: AM2431