ACT-PD1M16Y-070L4I Просмотр технического описания (PDF) - Aeroflex Corporation

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ACT-PD1M16Y-070L4I

Fast Page Mode 16 Megabit Plastic Monolithic DRAM

Aeroflex Corporation 

AC Characteristics (continued)

(VCC = 5.0V, VSS = 0V, TCI or TCM)

Parameter

Setup Time, WE Low before CAS Low (early-write operation only)

Hold Time, Column Address after CAS Low

Hold Time, Data 5

Hold Time, Row Address after RAS Low

Hold Time, WE High after CAS High 6

Hold Time, WE High after RAS High 6

1. All cycle times assume tT= 5ns, reference to VIH (min) and VIL (max).

2. To assume tPC min, tASC should be ≥ tCP.

3. In read-write cycle, tRWD and tRWL must be observed.

4. In read-write cycle, tCWD and tCWL must be observed.

5. Referenced to the later of xCAS or WE in write operations.

6. Either tRRH or tRCH must be satisfied for a read cycle.

Sym

tWCS

tCAH

tDH

tRAH

tRCH

tRRH

Min Max

0

-

15

-

15

-

10

-

0

-

0

-

Units

ns

ns

ns

ns

ns

ns

AC Characteristics

(VCC = 5.0V, VSS = 0V, TCI or TCM)

Parameter

Sym

Min Max

WE Low before CAS Low Hold Time (early-write operation only)

tWCH

15

-

OE Command Hold Time

tOEH

15

-

RAS Referenced to OE Hold Time

tROH

10

-

RAS from CAS Precharge (Fast Page Mode)

tRHCP 40

-

Column Address to WE Low Delay Time (read-write operation only)

tAWD 60

-

RAS Low to CAS High Delay Time (CBR refresh only)

tCHR

15

-

CAS High to RAS Low Delay Time (CAS to RAS Precharge Time)

tCRP

5

-

RAS Low to CAS High Delay Time (CAS Hold Time)

tCSH

70

-

CAS Low to RAS Low Delay Time (CAS Set-up Time)

tCSR

5

-

CAS Low to WE Low Delay Time (read-write operation only)

tCWD 45

-

OE to Data Delay Time

tOED

15

-

RAS Low to Column Address Delay Time 1

tRAD

15

35

Column Address to RAS High Delay Time

RAS Low to CAS Low Delay Time 1

tRAL

35

-

tRCD

20

50

RAS High to CAS Low Precharge Time

tRPC

5

-

CAS Low to RAS High Delay Time (RAS Hold Time)

tRSH

20

-

RAS Low to WE Low Delay Time (read-write operation only)

tRWD

95

-

WE Low after CAS Precharge Delay Time (read-write operation only)

tCWD 65

-

Refresh Time Interval

tREF

16

Transition time 2

tT

3

50

1. The maximum value is specified only to assure access time

2. Transition times (rise and fall) for RAS and xCAS are to be a minimum of 3ns and a maximum of 30ns.

Units

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ms

ns

Aeroflex Circuit Technology

4

SCD3750 REV A 8/31/98 Plainview NY (516) 694-6700

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