Hyundai GMS90X54C, GMS90X51C, GMS90X52C AC Characteristics for GMS90X5XC series 40MHz version

GMS90X5XC Series HYUNDAI MicroElectronics

AC Characteristics for GMS90X5XC series (40MHz version)

VCC= 5V + 10%, − 15%; VSS= 0V; TA= 0°C to 70°C

(CL for port 0. ALE and PSEN outputs = 100pF; CL for all other outputs = 80pF)

External Program Memory Characteristics

40 MHz Oscillator

Variable Oscillator

Parameter

Symbol

1/tCLCL = 3.5 to 40MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

35

-

2tCLCL−15

-

ns

Address setup to ALE

tAVLL

10

-

tCLCL−15

-

ns

Address hold after ALE

tLLAX

10

-

tCLCL−15

-

ns

ALE low to valid instruction in

tLLIV

-

55

-

4tCLCL−45

ns

ALE to

tLLPL

10

-

tCLCL−15

-

ns

PSEN

pulse width

tPLPH

60

-

3tCLCL−15

-

ns

PSEN

to valid instruction in

tPLIV

-

25

-

3tCLCL−50

ns

PSEN

Input instruction hold after

tPXIX

0

-

0

-

ns

PSEN

Input instruction float after

tPXIZ †

-

15

-

tCLCL−10

ns

PSEN

Address valid after

tPXAV †

20

-

tCLCL−5

-

ns

PSEN

Address to valid instruction in

tAVIV

-

65

-

5tCLCL−60

ns

Address float to

tAZPL

5

-

5

-

ns

PSEN

†Interfacing the GMS90X5XC series to devices with float times up to 20 ns is permissible. This limited bus contention will not cause any damage to port 0 Drivers.

Jan. 2001 Ver 1.0 37