Hyundai GMS90X54C, GMS90X51C, GMS90X52C user manual Advance Information 24MHz External Clock Drive

HYUNDAI MicroElectronics

GMS90X5XC Series

AC Characteristics for GMS90X5XC series (24MHz)

External Data Memory Characteristics

24 MHz Oscillator

Variable Oscillator

Parameter

Symbol

1/tCLCL = 3.5 to 24MHz

Unit

Min.

Max.

Min.

Max.

pulse width

tRLRH

180

-

6tCLCL-70

-

ns

RD

pulse width

tWLWH

180

-

6tCLCL-70

-

ns

WR

Address hold after ALE

tLLAX2

15

-

tCLCL-27

-

ns

to valid data in

tRLDV

-

118

-

5tCLCL-90

ns

RD

Data hold after

tRHDX

0

-

0

-

ns

RD

Data float after

tRHDZ

-

63

-

2tCLCL-20

ns

RD

ALE to valid data in

tLLDV

-

200

-

8tCLCL-133

ns

Address to valid data in

tAVDV

-

220

-

9tCLCL-155

ns

ALE to

or

tLLWL

75

175

3tCLCL-50

3tCLCL+50

ns

WR

RD

Address valid to

or

tAVWL

67

-

4tCLCL-97

-

ns

WR

RD

or

high to ALE high

tWHLH

17

67

tCLCL-25

tCLCL+25

ns

WR

RD

Data valid to

transition

tQVWX

5

-

tCLCL-37

-

ns

WR

Data setup before

tQVWH

170

-

7tCLCL-122

-

ns

WR

Data hold after

tWHQX

15

-

tCLCL-27

-

ns

WR

Address float after

tRLAZ

-

0

-

0

ns

RD

Advance Information (24MHz)

External Clock Drive

Variable Oscillator

Parameter

Symbol

(Freq. = 3.5 to 24MHz)

Unit

Min.

Max.

Oscillator period

tCLCL

41.7

285.7

ns

High time

tCHCX

12

tCLCL - tCLCX

ns

Low time

tCLCX

12

tCLCL - tCHCX

ns

Rise time

tCLCH

-

12

ns

Fall time

tCHCL

-

12

ns

34 Jan. 2001 Ver 1.0