A-Data

ADS7608A4A

AC Characteristics

-5

-5.5

-6

-7

-7.5

Parameter

Symbol

Min Max Min Max Min Max Min Max Min Max

Unit Note

/CAS Latency = 3

tCK3

5

5.5

6

7

7.5

System clock

Cycle time

/CAS Latency = 2

tCK2

10

1000

10

1000

10

1000

10

1000

7.5

1000 ns

Clock high pulse width

tCHW

2

-

2.25

-

2.5

-

2.5

-

2.5

-

ns

1

Clock low pulse width

tCLW

2

-

2.25

-

2.5

-

2.5

-

2.5

-

ns

1

/CAS Latency = 3

tAC3

-

4.5

-

5

-

5.4

-

5.4

-

5.4

Access time

form clock

/CAS Latency = 2

tAC2

-

6

-

6

-

6

-

6

-

5.4

ns

2

Operation

tRC

55

-

55

-

60

-

62

-

65

-

/RAS cycle

time

Auto Refresh

tRRC

55

-

55

-

60

-

62

-

65

-

ns

/RAS to /CAS delay

tRCD

15

-

16.5

-

18

-

20

-

15

-

ns

/RAS active time

tRAS

40 100K 38.5 100K 42 100K 42 120K 45 120K ns

/RAS precharge time

tRP

15

-

16.5

-

18

-

20

-

15

-

ns

/RAS to /RAS bank active delay

tRRD

10

-

11

-

12

-

14

-

15

-

ns

/CAS to /CAS delay

tCCD

1

-

1

-

1

-

1

-

1

-

CLK

Write command to data – in delay tWTL

0

-

0

-

0

-

0

-

0

-

CLK

Data – in to precharge command

tDPL

1

-

1

-

1

-

1

-

1

-

CLK

Data – in active command

tDAL

5

-

5

-

5

-

4

-

4

-

CLK

DQM to data – out Hi-Z

tDQZ

2

-

2

-

2

-

2

-

2

-

CLK

DQM to data – in mask

tDQM

0

-

0

-

0

-

0

-

0

-

CLK

Data – out hold time

tOH

1.5

-

2

-

2.7

-

2.7

-

2.7

-

ns

Data – input setup time

tDS

1.5

-

1.5

-

1.5

-

1.5

-

1.5

-

ns

1

Data – input hold time

tDH

1

-

1

-

1

-

1

-

1

-

ns

1

Address setup time

tAS

1.5

-

1.5

-

1.5

-

1.5

-

1.5

-

ns

1

Address hold time

tAH

1

-

1

-

1

-

1

-

1

-

ns

1

CKE setup time

tCKS

1.5

-

1.5

-

1.5

-

1.5

-

1.5

-

ns

1

CKE hold time

tCKH

1

-

1

-

1

-

1

-

1

-

ns

1

Command setup time

tCS

1.5

-

1.5

-

1.5

-

1.5

-

1.5

-

ns

1

Command hold time

tCH

1

-

1

-

1

-

1

-

1

-

ns

1

CLK to data output in low Z-time

tOLZ

1

-

1

-

1

-

1.5

-

1.5

-

ns

MRS to new command

tMRD

2

-

2

-

2

-

1

-

1

-

CLK

Power down exit time

tPDE

1

-

1

-

1

-

1

-

1

-

CLK

Self refresh exit time

tSRE

1

-

1

-

1

-

1

-

1

-

CLK

3

Refresh time

tREF

64

-

64

-

64

-

64

-

64

-

ms

Note : 1. Assume tR / tF (input rise and fall time) is 1 ns.

2. Access times to be measured with input signals of 1v / ns edge rate.

3.A new command can be given tRRC after self refresh exit.

Rev 1 April, 2001

6