AN94902 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A.pdf

AN94902
Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
Author: Girija Chougala
Associated Project: No
Associated Part Family: FM25V02, FM25V01, FM25V02A, FM25V01A
Software Version: None
Related Documents: For a complete list, click here
AN94902 discusses the key differences that need to be considered when migrating from FM25V02/FM25V01 to
FM25V02A/FM25V01A. FM25V02/FM25V01 is now “Not Recommended for New Designs”; this application note
explains how FM25V02A/FM25V01A is a replacement for FM25V02/FM25V01.
Introduction
TM
FM25V02A/FM25V01A, a 256-Kbit/128-Kbit SPI F-RAM ,
is a replacement device for FM25V02/FM25V01, which is
now “Not recommended for new designs.” The two
devices are identical in terms of pinout, package
composition and dimensions, and read/write functionality.
This application note discusses the key differences
between the two devices that need to be considered when
migrating from FM25V02/FM25V01 to FM25V02A/
FM25V01A.
Drop-In Replacement or Not?
From a hardware point of view, the two devices are
identical. From a software point of view, the two devices
are identical except for the power-up to first-access
specification (tPU) and Device ID.
Refer to the Critical Considerations section for more
details.
Table 1
shows
the
compatibility
chart
of
FM25V02/FM25V01 and FM25V02A/FM25V01A. For a
detailed comparison, see Table 3.
Table 1. Compatibility Chart
FM25V02/FM25V01
Feature or Spec
Is FM25V02A/FM25V01A
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
Ordering Part Numbers
Table 2 lists the recommended FM25V02AFM25V01A ordering part numbers that correspond to the FM25V02/FM25V01 (Not
Recommended for New Designs) ordering part numbers.
Table 2. Recommended Ordering Part Numbers for Migration
FM25V02/FM25V01
Ordering Part Number
FM25V02A/FM25V01A
Status
FM25V02-G
FM25V02-GTR
FM25V02-DG
FM25V02-DGTR
www.cypress.com
Ordering Part Number
Comments
Status
FM25V02A-G
Not Recommended
for New Designs
FM25V02A-GTR
In production
FM25V02A-DG
No hardware change but software
changes are required.
FM25V02A-DGTR
Document No. 001-94902 Rev. **
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Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
FM25V02/FM25V01
Ordering Part Number
FM25V01-G
FM25V01-GTR
FM25V02A/FM25V01A
Status
Ordering Part Number
Not Recommended
for New Designs
FM25V01A-G
Comments
Status
In production
FM25V01A-GTR
No hardware change but software
changes are required.
Comparison of FM25V02/FM25V01 and FM25V02A/FM25V01A
Table 3 gives a detailed comparison of the two devices.
Table 3. Detailed Comparison Table
FM25V02/FM25V01
FM25V02A/FM25V01A
-G
-G
(FM25V02/FM25V01)
(FM25V02A/FM25V01A)
-DG
-DG
(FM25V02)
(FM25V02A)
SOIC-8
SOIC-8
(FM25V02/FM25V01)
(FM25V02A/FM25V01A)
DFN-8
DFN-8
Package Types
Pinout/Package Outlines
Comments
Identical “green (RoHS)” packages
Identical pinout, outline and board footprint
(FM25V02)
(FM25V02A)
Temperature Range
–40 ºC to +85 ºC
–40 ºC to +85 ºC
Identical
Operating Voltage Range
2.0 V to 3.6 V
2.0 V to 3.6 V
Identical
0.22 mA @ 1 MHz
0.22 mA @ 1 MHz
2.5 mA @ 40 MHz
2.5 mA @ 40 MHz
Standby Current
150 µA @ 85 ºC
150 µA @ 85 ºC
Identical
Sleep Current
8 µA @ 85 ºC
8 µA @ 85 ºC
Identical
Read / Write Function
-
-
Identical 2-byte addressing, Identical opcodes
Clock Frequency
40 MHz
40 MHz
Identical
10 years (+85 ºC)
10 years (+85 ºC)
38 years (+75 ºC)
38 years (+75 ºC)
151 years (+65 ºC)
151 years (+65 ºC)
Endurance (Write/Read Cycles)
1E+14
1E+14
Identical
Power-Up to First Access (tPU)
250 µs
1 ms
FM25V02A/FM25V01A is slower in first access
7F7F7F7F7F7FC22100h
(FM25V01)
7F7F7F7F7F7FC22108h
(FM25V01A)
7F7F7F7F7F7FC22200h
7F7F7F7F7F7FC22208h
(FM25V02)
(FM25V02A)
Clock HIGH time (tCH)
20 ns
18 ns
FM25V02A/FM25V01A has better spec
Clock LOW time (tCL)
20 ns
18 ns
FM25V02A/FM25V01A has better spec
Output data valid time (tODV)
18 ns
16 ns
FM25V02A/FM25V01A has better spec
Active Supply Current
Data Retention
Device ID
www.cypress.com
Document No. 001-94902 Rev. **
Identical
Identical
Different. Refer to “Critical Considerations” for
more details.
2
Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
Critical Considerations
You should consider all the parameter differences mentioned in Table 3 during the migration to FM25V02A/FM25V01A. This
section discusses the critical differences. System designers should also review the datasheet when migrating to the new part.
Power-Up to First Access
The power-up to first access specification is slower in FM25V02A/FM25V01A device. Ensure that the FM25V02A/FM25V01A
device is accessed only after 1 ms from power-up.
Device ID Feature
The FM25V02A/FM25V01A and FM25V02/FM25V01 incorporate a 9-byte read-only Device ID to identify the product uniquely.
The Device ID allows the host to determine the manufacturer, product density, and product revision. Table 4 gives a Device ID
of FM25V02/FM25V01 and FM25V02A/FM25V01A. A system software update is required to use this feature when migrating to
the FM25V02A/FM25V01A.
Table 4. Device ID
Device ID
FM25V01
FM25V01A
7F7F7F7F7F7FC22100h
7F7F7F7F7F7FC22108h
FM25V02
FM25V02A
7F7F7F7F7F7FC22200h
7F7F7F7F7F7FC22208h
1. Device ID difference is highlighted in red color
Summary
AN94902 discussed the differences between FM25V02/FM25V01 and FM25V02A/FM25V01A that need to be considered
during migration to the FM25V02A/FM25V01A.
www.cypress.com
Document No. 001-94902 Rev. **
3
Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
Related Documents
Datasheet
FM25V02A: 256-Kbit (32K × 8) Serial (SPI) F-RAM
FM25V01A: 128-Kbit (16K × 8) Serial (SPI) F-RAM
Application Note
AN304 – SPI GUIDE FOR F-RAM
www.cypress.com
Document No. 001-94902 Rev. **
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Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
Document History
Document Title: Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A - AN94902
Document Number: 001-94902
Revision
**
ECN
4652338
www.cypress.com
Orig. of
Change
GVCH
Submission
Date
03/17/2015
Description of Change
New Spec.
Document No. 001-94902 Rev. **
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Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A
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Document No. 001-94902 Rev. **
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