AN322 Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B.pdf

AN322
Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B
Author: Girija Chougala
Associated Project: No
Associated Part Family: FM25L04-GA, FM25L04B-GA
Software Version: None
Related Documents: For a complete list, click here
AN322 discusses the key differences that need to be considered when migrating from Grade 1 version of FM25L04 to
Grade 1 version of FM25L04B. FM25L04 is now obsolete and this application note explains how FM25L04B is a
replacement for FM25L04.
Table 1. Compatibility Chart
Introduction
FM25L04B-GA, a 4-Kbit SPI Grade 1 F-RAM™, is a
replacement device for FM25L04-GA, which is now
obsolete. The two devices are identical in terms of
package, pinout, DC / AC parameters, and read / write
functionality. This application note discusses the key
differences between the two devices that need to be
considered when migrating from FM25L04-GA to
FM25L04B-GA.
FM25L04-GA Feature or Spec
Drop-In Replacement or Not?
From a software point of view, the two devices are
identical. Both devices are read/write compatible and use
the same one-byte address. From a hardware point of
view, the key differences between the two devices are the
higher standby current and lower operating current of
FM25L04B-GA.
Is FM25L04B-GA
compatible?
Package
Yes
Pinout
Yes
Temperature Range
Yes
Operating Voltage
Yes
Operating Current
Yes
Standby Current
No
Read / Write Function
Yes
Timing / Frequency
Yes
Data Retention
Yes
Endurance
Yes
Table 1 shows the compatibility chart of FM25L04-GA and
FM25L04B-GA. For a detailed comparison, see Table 3
Ordering Part Numbers
Table 2 gives the recommended FM25L04B-GA ordering part numbers that correspond to the now obsolete FM25L04-GA
ordering part numbers.
Table 2. Recommended Ordering Part Numbers for Migration
FM25L04-GA
Ordering Part Number
FM25L04-GA
FM25L04-GATR
www.cypress.com
FM25L04B-GA
Status
Obsolete
Ordering Part Number
FM25L04B-GA
Comments
Status
In production
FM25L04B-GATR
Document No. 001-86845 Rev. *B
No hardware or software change is
required
1
Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B
Comparison of FM25L04 and FM25L04B
Table 3 gives a detailed comparison of the two devices.
Table 3. Detailed Comparison
Package Types
Package Outlines
Pinout
Temperature Range
Operating Voltage Range
Active Supply Current
FM25L04-GA
FM25L04B-GA
-GA
-GA
SOIC-8
SOIC-8
-
-
Identical
–40 ºC to +125 ºC
–40 ºC to +125 ºC
Identical
3.0 V to 3.6 V
3.0 V to 3.6 V
Identical
250 µA @ 1 MHz
200 µA @ 1 MHz
2.2 mA @ 10 MHz
2.0 mA @ 10 MHz
Comments
Identical “green” SOIC package
Identical outline and board footprint
FM25L04B-GA offers lower active current
1 µA (+85 ºC)
6 µA (+85 ºC)
15 µA (+125 ºC)
20 µA (+125 ºC)
-
-
10 MHz
10 MHz
-
-
9000 hours (+125 ºC)
11000 hours (+125 ºC)
after
11 years (+105 ºC)
17 years (+55 ºC)
121 years (+85 ºC)
Endurance (Write/Read Cycles)
Unlimited
1E+13
VDD Power-Up Ramp Rate (tVR)
50 µs / V
30 µs / V
Improved power-up ramp rate in
FM25L04B-GA
VDD Power-Down Ramp Rate (tVF)
100 µs / V
20 µs / V
Improved power-down ramp rate in
FM25L04B-GA
-
1 ms
After power-up, the first access of
FM25L04B-GA should be after 1 ms
Standby Current
Read / Write Function
Clock Frequency
AC Timing Parameters
Data Retention
Power-Up to First Access (tPU)
FM25L04B-GA has higher standby current
Identical one-byte addressing, Identical opcodes
Identical
All specification limits are the Identical
FM25L04B-GA offers better data retention
FM25L04B-GA’s endurance is large enough
to be considered as unlimited for all practical
applications. For a 64-byte loop, at 10 MHz,
FM25L04B-GA’s endurance is 17 years.
Critical Considerations
You should consider all the parameter differences mentioned in Table 3 during the migration to FM25L04B-GA. This section
discusses the critical differences. System designers should also review the datasheet when migrating to the new part.
Power-Up to First Access
Power-up to first access specification is added in FM25L04B-GA device. Ensure that the FM25L04B-GA device is accessed
only after 1 ms from power-up.
Summary
AN322 discussed the differences between the Grade 1 versions of FM25L04 and FM25L04B that need to be considered
during migration to the FM25L04B.
www.cypress.com
Document No. 001-86845 Rev. *B
2
Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B
Related Documents
Datasheet
FM25L04B: 4-Kbit (512 × 8) Serial (SPI) Automotive F-RAM datasheet
Application Note
AN304 – SPI GUIDE FOR F-RAM
www.cypress.com
Document No. 001-86845 Rev. *B
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Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B
Document History
Document Title: Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B - AN322
Document Number: 001-86845
Revision
ECN
Orig. of
Change
Submission
Date
Description of Change
**
3944550
GVCH
03/26/2013
New Spec.
*A
4279208
MEDU
03/05/2014
Updated to Cypress Template.
Updated data retention for FM25L04B-GA.
Updated “VDD Power-Down Ramp Rate” for FM25L04B-GA from 100 µs / V to
20 µs / V.
Updated “Power-Up to First Access” for FM25L04B-GA from 10 ms to 1 ms.
*B
4498656
GVCH
09/23/2014
Changed title from “Differences between Grade 1 versions of FM25L04 and
FM25L04B” to “Migrating from Grade 1 version of FM25L04 to Grade 1 version of
FM25L04B.”
Updated abstract.
Added “Ordering Part Numbers” section.
Added title for Table 3.
Added “Related Documents” section.
www.cypress.com
Document No. 001-86845 Rev. *B
4
Migrating from Grade 1 version of FM25L04 to Grade 1 version of FM25L04B
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Document No. 001-86845 Rev. *B
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