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FM22LD16-55-BG Datenblatt(PDF) 3 Page - Cypress Semiconductor

Teilenummer FM22LD16-55-BG
Bauteilbeschribung  4Mbit F-RAM Memory
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Hersteller  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM22LD16-55-BG Datenblatt(HTML) 3 Page - Cypress Semiconductor

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FM22LD16 - 256Kx16 FRAM
Document Number: 001-86190 Rev. **
Page 3 of 15
Functional Truth Table
1,2
/CE
/WE
A(17:2)
A(1:0)
Operation
H
X
X
X
Standby/Idle
H
V
V
Read
L
H
No Change
Change
Page Mode Read
L
H
Change
V
Random Read
L
V
V
/CE-Controlled Write
L
V
V
/WE-Controlled Write
2
L

No Change
V
Page Mode Write
3
X
X
X
Starts Precharge
Notes:
1)
H=Logic High, L=Logic Low, V=Valid Data, X=Don’t Care.
2)
/WE-controlled write cycle begins as a Read cycle and A(17:2) is latched then.
3)
Addresses A(1:0) must remain stable for at least 10 ns during page mode operation.
4)
For write cycles, data-in is latched on the rising edge of /CE or /WE, whichever comes first.
Byte Select Truth Table
/OE
/LB
/UB
Operation
H
X
X
Read; Outputs Disabled
X
H
H
L
H
L
Read; DQ(7:0) Hi-Z
L
H
Read; DQ(15:8) Hi-Z
L
L
Read
X
H
L
Write; Mask DQ(7:0)
L
H
Write; Mask DQ(15:8)
L
L
Write
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.


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