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FM25V05-G Datasheet(PDF) 9 Page - Ramtron International Corporation

Part # FM25V05-G
Description  512Kb Serial 3V F-RAM Memory
Download  16 Pages
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Manufacturer  RAMTRON [Ramtron International Corporation]
Direct Link  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25V05-G Datasheet(HTML) 9 Page - Ramtron International Corporation

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FM25V05 - 512Kb SPI FRAM
Rev. 2.0
May 2010
Page 9 of 16
Sleep Mode
A low power mode called Sleep Mode is
implemented on both FM25V05 and FM25VN05
devices. The device will enter this low power state
when the SLEEP op-code B9h is clocked-in and a
rising edge of /S is applied. Once in sleep mode, the
C and D pins are ignored and Q will be high-Z, but
the device continues to monitor the /S pin. On the
next falling edge of /S, the device will return to
normal operation within tREC (400
µs max.). The Q
pin remains in a hi-Z state during the wakeup period.
The device will not necessarily respond to an opcode
within the wakeup period.
To start the wakeup
procedure, the controller may send a “dummy” read,
for example, and wait the remaining tREC time.
Figure 12. Sleep Mode Entry
Device ID
The FM25V05 and FM25VN05 devices can be interrogated for its manufacturer, product identification, and die
revision. The RDID op-code 9Fh allows the user to read the manufacturer ID and product ID, both of which are
read-only bytes. The JEDEC-assigned manufacturer ID places the Ramtron identifier in bank 7, therefore there are
six bytes of the continuation code 7Fh followed by the single byte C2h. There are two bytes of product ID, which
includes a Family code, a Density code, a Sub code, and Product Revision code.
Table 6. Manufacturer and Product ID
Bit
7
6
5
4
3
2
1
0
Hex
Manufacturer ID
0
1
1
1
1
1
1
1
7F
Continuation code
0
1
1
1
1
1
1
1
7F
Continuation code
0
1
1
1
1
1
1
1
7F
Continuation code
0
1
1
1
1
1
1
1
7F
Continuation code
0
1
1
1
1
1
1
1
7F
Continuation code
0
1
1
1
1
1
1
1
7F
Continuation code
1
1
0
0
0
0
1
0
C2
JEDEC assigned Ramtron C2h in bank 7
Family
Density
Hex
Device ID (1st Byte)
0
0
1
0
0
0
1
1
23h
Density: 01h=128K, 02h=256K, 03h=512K, 04=1M
Sub
Rev.
Rsvd
Device ID (2nd Byte)
0
0
0
0
0
0
0
0
00h
00h=FM25V05, 01h=FM25VN05
Figure 13. Read Device ID
S
C
D
Q
Enter Sleep
Mode
S
C
D
Q
7Fh
7Fh
C2h
00h
Six bytes of continuation code 7Fh
9Fh
23h
1
6
. . . . . . .


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