FlexROM™ III Timing Specifications

NOTE: These items have been discontinued for a long time.
We no longer support these products or offer alternatives.

We retain these pages so that users can see what their existing tools support and to provide download links to the final documentation and software versions. We have a few replacement parts left, but not many. Available items have an 'ADD to CART' or 'Buy Now' button next to them. Otherwise they are not available.

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Timing Specifications

The following specifications assume:
- All Filtering has been disabled.
- The Latching options have been left at the default setting of (CS and WT active).
- Latch delay has been disabled.

Enabling Filtering and/or Latch delaying adds 10-40ns to the Tcr-2. Tcr-3 and Tcr-4 specs. Enabling Latch on (CS) or Latch on (CS and NOT OE) with MINIMUM delay selected reduces Twp to 20ns. Higher delay settings could result in longer Trdc & Twtc requirements.

Read Cycles:

Symbol Name Description Value
Trdc Read Cycle Time for a complete read cycle 45ns (max)
Tacc Address Access Time from address stable to data valid 45ns (max)
Tcs CS Access
Fast-CS enabled
Fast-CS disabled
Time from CS active to data valid
12ns (max)
45ns (max)
Toe CS Access
Fast-OE enabled
Fast-OE disabled
Time from OE active to data valid
12ns (max)
30ns (max)
Todo OE to data disable Time from rising edge OE to data float 0 - 6ns
Tcod CS to data disable Time from rising edge CS to data float 0 - 12ns
Tcr-1 Cycle Recovery time, valid data Minimum recovery after a read 0ns (min)
NOTE: Data will be valid after ALL access time specs have been meet; Tacc after address stable, Tcs after CS active and Toe after OE active.

Write Cycles (WT controlled/CS controlled):

Symbol Name Description Value
Twtc Write Cycle Time for a complete write cycle 45ns (max)
Tas Address Setup time Address stable to falling edge WT/CS 0ns (min)
Tah Address Hold time Address held after rising edge WT/CS 0ns (min)
Tds Data Setup time Data stable to rising edge WT/CS 10ns (min)
Tdh Data Hold time Data held after rising edge WT/CS 0ns (min)
Twp WT pulse width Minimum WT active pulse width 25ns (min)
Todw WT to data disable Time from falling edge WT to data float (if CS & OE were active) 0 - 12ns
Tcr-2 Cycle recovery time, writes Minimum recovery time after a write 20ns (min)

Snap-shot and Trigger functions

Symbol Name Description Value
Tcr-3 Cycle Recovery time, reads Minimum recovery time after a read 10ns (min)
Tcr-4 Cycle recovery time, writes Minimum recovery time after a write 25ns (min)
Top OE pulse width Minimum OE active pulse 25ns (min)
NOTE: Violation of the Snap-shot/Trigger specs will not cause target side failures unless their specs are being violated as well.