Comparison between FM25V20A and CY15B102QN F-RAM
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Knowledge Base Article discusses the key differences that need to be considered when migrating from FM25V20A to CY15B102QN. The two devices are identical in terms of package composition and dimensions, and read/write functionality. From a hardware point of view, two devices are identical. Form a software point of view, the key difference between the two devices are sleep mode (Hibernate mode) entry time, and Device ID.
CY15B102QN adds many features like operation down to 1.8 V, deep power down capability, lower standby current and higher speed capability. Table 1 shows the compatibility chart of FM25V20A and CY15B102QN. For a detailed comparison of the devices, see Table 2.
Table 1. Compatibility Chart
FM25V20A Feature or Spec |
CY15B102QN Compatible? |
Package |
Yes |
Pinout |
Yes |
Temperature Range |
Yes |
Operating Voltage |
Yes |
Operating Current |
Yes |
Standby Current |
Yes |
Read / Write Function |
Yes |
Timing / Frequency |
Yes |
Data Retention |
Yes |
Endurance |
Yes |
Table 2. Detailed Comparison Table
|
FM25V20A |
CY15B102QN |
Comments |
Package type |
-G, -DG, -PG |
-S, -LH, -PZ |
Identical “Green (RoHS)” package for SOIC, DFN, PDIP |
Pinout/package Outline |
SOIC-8, DFN-8, PDIP-8 |
SOIC-8, DFN-8, PDIP-8 |
Identical outline and board footprint. |
Temperature Range |
–40 ºC to +85 ºC |
–40 ºC to +85 ºC |
Identical |
Operating Voltage Range |
2.0 V to 3.6 V |
1.8 V to 3.6 V |
CY15B102QN allows operation down to 1.8 V. |
Active Supply Current (typ) |
500 µA @ 1 MHz (SOIC/DFN) 1.5 mA @ 25 MHz (PDIP) 2.4 mA @ 40 MHz - |
- - 2.4 mA @ 40 MHz 3.0 mA @ 50 MHz |
Identical |
Active Supply Current (Max) |
800 uA @ 1MHz 2.0 mA @ 25MHz (PDIP) 3.0 mA @ 40 MHz - |
- - 3.0 mA @ 40 MHz 3.7 mA @ 50 MHz |
|
Standby Current |
250 µA @ 85 ºC |
70 µA @ 85 ºC |
CY15B102QN offers lower standby current |
Sleep Mode or Hibernate Current |
8 µA |
1.6 µA |
CY15B102QN offers lower sleep mode current. Sleep function is called Hibernate in CY15B102QN. |
CS# high to enter hibernate (tENTHIB) |
- |
3 µs |
Different. Refer to Hibernate Mode section in “Device datasheet” for more details. Sleep mode of FM25V20A is refereed as Hibernate mode in CY15B102QN. |
Read / Write Function |
3-byte addressing, op-codes |
3-byte addressing, op-codes |
Identical |
Clock Frequency |
40 MHz |
50 MHz |
Higher speed offered in CY15B102QN |
Data Retention |
10 years (+85 ºC) |
10 years (+85 ºC) |
Identical |
Endurance (Write/Read Cycles) |
1E+14 |
1E+14 |
Identical |
VDD Power-Up Ramp Rate (tVR) |
50 µs / V |
50 µs / V |
Identical |
VDD Power-Down Ramp Rate (tVF) |
100 µs / V |
100 µs / V |
Identical |
Power-Up to First Access (tPU) |
1 ms |
450 µs |
Better power-up to first access specification in CY15B102QN |
Device ID |
7F7F7F7F7F7FC22508h |
7F7F7F7F7F7FC22A00h |
Different. Refer to Device ID section in “Device datasheet” for more details. |
Refer to following listed datasheets for more details.