71321LA55PFGI datasheet(8/18 Pages) IDT

8 / 18 page

6.42

IDT71321SA/LA and IDT71421SA/LA

High Speed 2K x 8 Dual-Port Static RAM with Interrupts

Industrial and Commercial Temperature Ranges

T im ing Wa ve for m of Re a d Cycle N o. 2 , Eit he r Side (3)

NOTES:

1. Timing depends on which signal is asserted last, OE or CE.

2. Timing depends on which signal is de-asserted first, OE or CE.

3. R/W = VIH and OE = VIL, and the address is valid prior to or coincidental with CE transition LOW.

4. Start of valid data depends on which timing becomes effective last tAOE, tACE, tAA, and tBDD.

T im ing Wa ve for m of Re a d Cycle N o. 1 , Eit he r Side (1)

NOTES:

1. R/W = VIH, CE = VIL, and is OE = VIL. Address is valid prior to the coincidental with CE transition LOW.

2. tBDD delay is required only in the case where the opposite port is completing a write operation to the same address location. For simultaneous read operations

BUSY has no relationship to valid output data.

3. Start of valid data depends on which timing becomes effective last tAOE, tACE, tAA, and tBDD.

ADDRESS

DATAOUT

tRC

tOH

PREVIOUS DATA VALID

tAA

tOH

DATA VALID

2691 drw 06

tBDDH

(2,3)

BUSYOUT

tACE

tAOE

tHZ

tLZ

tPD

VALID DATA

tPU

50%

DATAOUT

CURRENT

ICC

ISS

50%

2691 drw 07

(4)

(1)

(2)

(4)

tLZ

tHZ

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