IDT7026L25GI(2015) Ver la hoja de datos (PDF) - Integrated Device Technology

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IDT7026L25GI
(Rev.:2015)

HIGH-SPEED 16K X 16 DUAL-PORT STATIC RAM

Integrated Device Technology 

IDT7026S/L

High-Speed 16K x 16 Dual-Port Static RAM

Military, Industrial and Commercial Temperature Ranges

Timing Waveform of Write Cycle No. 1, R/W Controlled Timing(1,5,8)

tWC

ADDRESS

tHZ (7)

OE

tAW

CE or SEM (9)

UB or LB (9)

R/W

DATAOUT

DATAIN

tAS (6)

(4)

tWP (2)

tWZ (7)

tDW

tWR(3)

tOW

tDH

(4)

2939 drw 08

Timing Waveform of Write Cycle No. 2, CE, UB, LB Controlled Timing(1,5)

tWC

ADDRESS

CE or SEM(9)

UB or LB(9)

tAS(6)

tAW

tEW (2)

tWR(3)

R/W

DATAIN

tDW

tDH

2939 drw 09

NOTES:

1. R/W or CE or UB and LB = VIH during all address transitions.

2. A write occurs during the overlap (tEW or tWP) of a VIL CE = VIL and R/W = VIL for memory array writing cycle.

3. tWR is measured from the earlier of CE or R/W (or SEM or R/W) going VIH to the end of write cycle.

4. During this period, the I/O pins are in the output state and input signals must not be applied.

5. If the CE or SEM = VIL transition occurs simultaneously with or after the R/W = VIL transition, the outputs remain in the High-impedance state.

6. Timing depends on which enable signal is asserted last, CE or R/W.

7. This parameter is guaranteed by device characterization, but is not production tested. Transition is measured 0mV from steady state with the Output Test Load (Figure

2).

8. If OE = VIL during R/W controlled write cycle, the write pulse width must be the larger of tWP or (tWZ + tDW) to allow the I/O drivers to turn off and data to be placed

on the bus for the required tDW. If OE = VIH during an R/W controlled write cycle, this requirement does not apply and the write pulse can be as short as the

specified tWP.

9. To access RAM, CE = VIL and SEM = VIH. To access semaphore, CE = VIH and SEM = VIL. tEW must be met for either condition.

61.402

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