Hyundai GMS90X54C Explanation of the AC Symbols, External Program Memory Characteristics

HYUNDAI MicroElectronics GMS90X5XC Series

AC Characteristics

Explanation of the AC Symbols

Each timing symbol has 5 characters. The first character is always a ‘t’ (stand for time). The other characters, depending on their positions, stand for the name of a signal or the logical status of that signal. The following is a list of all the characters and what they stand for.

A:Address

C:Clock

D:Input Data

H:Logic level HIGH

I:Instruction (program memory contents)

L:Logic level LOW, or ALE

P:PSEN

Q:Output Data

R:RD signal

T:Time

V:Valid

W:WR signal

X:No longer a valid logic level

Z:Float

For example,

tAVLL = Time from Address Valid to ALE Low tLLPL = Time from ALE Low to PSEN Low

AC Characteristics for GMS90X5XC series (12MHz version)

VCC= 5V :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)

VCC= 3.3V : VCC= 3.3V + 0.3V, − 0.6V; VSS= 0V; TA= 0°C to 70°C

(CL for port 0. ALE and PSEN outputs = 50pF; CL for all other outputs = 50pF)

Variable clock : Vcc = 5V : 1/tCLCL = 3.5 MHz to 12 MHz

Vcc = 3.3V : 1/tCLCL = 1 MHz to 12 MHz

External Program Memory Characteristics

12 MHz Oscillator

Variable Oscillator

Parameter

Symbol

1/tCLCL = 3.5 to 12MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

127

-

2tCLCL-40

-

ns

Address setup to ALE

tAVLL

43

-

tCLCL-40

-

ns

Address hold after ALE

tLLAX

30

-

tCLCL-53

-

ns

ALE low to valid instruction in

tLLIV

-

233

-

4tCLCL-100

ns

ALE to

tLLPL

58

-

tCLCL-25

-

ns

PSEN

pulse width

tPLPH

215

-

3tCLCL-35

-

ns

PSEN

to valid instruction in

tPLIV

-

150

-

3tCLCL-100

ns

PSEN

Input instruction hold after

tPXIX

0

-

0

-

ns

PSEN

Input instruction float after

tPXIZ †

-

63

-

tCLCL-20

ns

PSEN

Address valid after

tPXAV †

75

-

tCLCL-8

-

ns

PSEN

Address to valid instruction in

tAVIV

-

302

-

5tCLCL-115

ns

Address float to

tAZPL

0

-

0

-

ns

PSEN

28 Jan. 2001 Ver 1.0