GMS90C51 datasheet(35/59 Pages) HYNIX

35 / 59 page

GMS90 Series

Dec. 1998 Ver 3.0

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.

AC Characteristics for GMS90 series (12MHz version)

External Program Memory Characteristics

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

Parameter

Symbol

12 MHz Oscillator

Variable Oscillator

1/tCLCL = 3.5 to 12MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

127

2tCLCL-40

Address setup to ALE

tAVLL

tCLCL-40

Address hold after ALE

tLLAX

tCLCL-53

ALE low to valid instruction in

tLLIV

-233

4tCLCL-100

ALE to PSEN

tLLPL

tCLCL-25

PSEN pulse width

tPLPH

215

3tCLCL-35

PSEN to valid instruction in

tPLIV

-150

3tCLCL-100

Input instruction hold after PSEN

tPXIX

Input instruction float after PSEN

tPXIZ †

-63

tCLCL-20

Address valid after PSEN

tPXAV †

tCLCL-8

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

GMS90C51 Datasheet(PDF) 35 Page - Hynix Semiconductor

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