AS7C251MNTF18A datasheet(15/18 Pages) ALSC

15 / 18 page

AS7C251MNTF18A

12/23/04, v 1.1

Alliance Semiconductor

P. 15 of 18

AC test conditions

Notes:

1) For test conditions, see “AC test conditions”, Figures A, B, C

2) This parameter measured with output load condition in Figure C.

3) This parameter is sampled, but not 100% tested.

4) tHZOE is less than tLZOE and tHZC is less than tLZC at any given temperature and voltage.

5) tCH measured high above VIH and tCL measured as low below VIL

6) This is a synchronous device. All addresses must meet the specified setup and hold times for all rising edges of CLK. All other synchronous inputs must

meet the setup and hold times with stable logic levels for all rising edges of CLK when chip is enabled.

7) Write refers to R/W and BW[a,b]

8) Chip select refers to CE0, CE1, and CE2.

Undefined/don’tcare

Falling input

Rising input

• Output load: For tLZC, tLZOE, tHZOE, and tHZC, see Figure C. For all others, see Figure B.

• Input pulse level: GND to 2.5V. See Figure A.

• Input rise and fall time (measured at 0.25V and 2.25V): 2 ns. See Figure A.

• Input and output timing reference levels: 1.25V.

DOUT

Ω

Figure B: Output load (A)

30 pF*

Figure A: Input waveform

10%

90%

GND

90%

10%

+2.5V

VL = VDDQ/2

Thevenin equivalent:

353

Ω/1538Ω

5 pF*

319

Ω/1667Ω

DOUT

GND

Figure C: Output load(B)

*including scope

and jig capacitance

+2.5V

AS7C251MNTF18A Datasheet(PDF) 15 Page - Alliance Semiconductor Corporation

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