Hyundai GMS90X51C, GMS90X52C, GMS90X54C user manual Advance Information 16MHz External Clock Drive

HYUNDAI MicroElectronics

GMS90X5XC Series

AC Characteristics for GMS90X5XC series (16MHz)

External Data Memory Characteristics

16 MHz Oscillator

Variable Oscillator

Parameter

Symbol

1/tCLCL = 3.5 to 16MHz

Unit

Min.

Max.

Min.

Max.

pulse width

tRLRH

275

-

6tCLCL-100

-

ns

RD

pulse width

tWLWH

275

-

6tCLCL-100

-

ns

WR

Address hold after ALE

tLLAX2

23

-

tCLCL-40

-

ns

to valid data in

tRLDV

-

183

-

5tCLCL-130

ns

RD

Data hold after

tRHDX

0

-

0

-

ns

RD

Data float after

tRHDZ

-

75

-

2tCLCL-50

ns

RD

ALE to valid data in

tLLDV

-

350

-

8tCLCL-150

ns

Address to valid data in

tAVDV

-

398

-

9tCLCL-165

ns

ALE to

or

tLLWL

138

238

3tCLCL−50

3tCLCL+50

ns

WR

RD

Address valid to

or

tAVWL

120

-

4tCLCL-130

-

ns

WR

RD

or

high to ALE high

tWHLH

28

97

tCLCL−35

tCLCL+35

ns

WR

RD

Data valid to

transition

tQVWX

13

-

tCLCL−50

-

ns

WR

Data setup before

tQVWH

288

-

7tCLCL-150

-

ns

WR

Data hold after

tWHQX

23

-

tCLCL−40

-

ns

WR

Address float after

tRLAZ

-

0

-

0

ns

RD

Advance Information (16MHz)

External Clock Drive

Variable Oscillator

Parameter

Symbol

(Freq. = 3.5 to 16MHz)

Unit

Min.

Max.

Oscillator period

tCLCL

62.5

285.7

ns

High time

tCHCX

17

tCLCL - tCLCX

ns

Low time

tCLCX

17

tCLCL - tCHCX

ns

Rise time

tCLCH

-

17

ns

Fall time

tCHCL

-

17

ns

32 Jan. 2001 Ver 1.0