FM22LD16_09 RAMTRON [Ramtron International Corporation], FM22LD16_09 Datasheet - Page 3

• Manufacturer Part Number: FM22LD16_09
• Description: 4Mbit F-RAM Memory
• Manufacturer: RAMTRON [Ramtron International Corporation]

Functional Truth Table
Notes:
1)
2)
3)
4)
Byte Select Truth Table
The /UB and /LB pins may be grounded if 1) the system does not
perform byte writes and 2) the device is not configured as a 512Kx8.
Rev. 2.0
Dec. 2009
/OE
/CE
H
X
X
L
H=Logic High, L=Logic Low, V=Valid Data, X=Don’t Care.
/WE-controlled write cycle begins as a Read cycle and A(17:2) is latched then.
Addresses A(1:0) must remain stable for at least 10 ns during page mode operation.
For write cycles, data-in is latched on the rising edge of /CE or /WE, whichever comes first.
H
L
L
L
L
/LB
X
H
H
H
L
L
L
L
/WE
X
H
X
H
H
L
/UB
X
H
H
H
L
L
L
L
1,2
No Change
No Change
A(17:2)
Change
X
V
V
V
X
Operation
Read; Outputs Disabled
Read; DQ(7:0) Hi-Z
Read; DQ(15:8) Hi-Z
Read
Write; Mask DQ(7:0)
Write; Mask DQ(15:8)
Write
Change
A(1:0)
X
V
V
V
V
V
X
Operation
Standby/Idle
Read
Page Mode Read
Random Read
/CE-Controlled Write
/WE-Controlled Write
Page Mode Write
Starts Precharge
3
2
FM22LD16 - 256Kx16 FRAM
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