591-2504-013F Dialight, 591-2504-013F Datasheet - Page 17

• Manufacturer Part Number: 591-2504-013F
• Description: LED ORANGE PRISM/CBI 606NM SMD
• Manufacturer: Dialight
• Series: Prism®, CBI®r

Specifications of 591-2504-013F

• Color: Orange
• Voltage Rating: 1.8V
• Current: 20mA
• Lens Style/size: Round, 2.84mm
• Configuration: Single
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lens Type: -
• Other names: 350-2314-2

Power Up Sequence in DDR II+ SRAM
DDR II+ SRAMs must be powered up and initialized in a
predefined manner to prevent undefined operations.
Power Up Sequence
■
■
Document Number: 001-57344 Rev. *A
Apply power and drive DOFF either HIGH or LOW (All other
inputs can be HIGH or LOW).
❐
❐
❐
Provide stable DOFF (HIGH), power and clock (K, K) for 20 μs
to lock the PLL.
Apply V
Apply V
Drive DOFF HIGH.
V
DD
/
DOFF
V
DD
DDQ
DDQ
before V
K
K
before V
DDQ
REF
.
or at the same time as V
Unstable Clock
Clock Start (Clock Starts after
V
DD
Figure 3. Power Up Waveforms
/
V
REF
DDQ
.
V
Stable (< +/- 0.1V DC per 50ns )
DD
/
V
PLL Constraints
■
■
■
DDQ
PLL uses K clock as its synchronizing input. The input must
have low phase jitter, which is specified as t
The PLL functions at frequencies down to 120 MHz.
If the input clock is unstable and the PLL is enabled, then the
PLL may lock onto an incorrect frequency, causing unstable
SRAM behavior. To avoid this, provide 20 μs of stable clock to
relock to the desired clock frequency.
Fix HIGH (or tie to V DDQ )
> 20 s Stable clock
Stable)
CY7C21701KV18
Start Normal
Operation
KC Var
Page 17 of 24
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