Hyundai GMS90X51C, GMS90X52C, GMS90X54C AC Characteristics for GMS90X5XC series 33MHz version

GMS90X5XC Series HYUNDAI MicroElectronics

AC Characteristics for GMS90X5XC series (33MHz 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

33 MHz Oscillator

Variable Oscillator

Parameter

Symbol

1/tCLCL = 3.5 to 33MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

40

-

2tCLCL-20

-

ns

Address setup to ALE

tAVLL

10

-

tCLCL-20

-

ns

Address hold after ALE

tLLAX

10

-

tCLCL-20

-

ns

ALE low to valid instruction in

tLLIV

-

56

-

4tCLCL-65

ns

ALE to

tLLPL

15

-

tCLCL-15

-

ns

PSEN

pulse width

tPLPH

80

-

3tCLCL-20

-

ns

PSEN

to valid instruction in

tPLIV

-

35

-

3tCLCL-55

ns

PSEN

Input instruction hold after

tPXIX

0

-

0

-

ns

PSEN

Input instruction float after

tPXIZ †

-

20

-

tCLCL-10

ns

PSEN

Address valid after

tPXAV †

25

-

tCLCL-5

-

ns

PSEN

Address to valid instruction in

tAVIV

-

91

-

5tCLCL-60

ns

Address float to

tAZPL

0

-

0

-

ns

PSEN

†Interfacing the GMS90X5XC series to devices with float times up to 35 ns is permissible. This limited bus contention will not cause

any damage to port 0 Drivers.

Jan. 2001 Ver 1.0 35