GMS90C320PL40 datasheet(34/46 Pages) HYNIX

34 / 46 page

GMS90C320

OCT. 2000 Ver 1.2

AC Characteristics for 24MHz version

External Program Memory Characteristics

VCC=5V:

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

(CL for port0.ALE and PSEN outputs = 50pF; CL for all other outputs = 50pF)

Variable clock:

Vcc = 5V: 1/tCLCL =3.5 MHz to24MHz

Vcc = 3.3V: 1/tCLCL =1 MHz to 24 MHz

Parameter

Symbol

24 MHz Oscillator

Variable Oscillator

1/tCLCL =3.5 to 24MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

2tCLCL-40

Address setup to ALE

tAVLL

tCLCL-25

Address hold after ALE

tLLAX

tCLCL-25

ALE low to valid instruction in

tLLIV

-80

4tCLCL-87

ALE to PSEN

tLLPL

tCLCL-20

PSEN pulse width

tPLPH

3tCLCL-30

PSEN to valid instruction in

tPLIV

-60

3tCLCL-65

Input instruction hold after PSEN

tPXIX

Input instruction float after PSEN

tPXIZ1)

Interfacing the GMS90C320 to devices with float times up to 35 ns is permissible. This limited bus contention will not cause

any damage to port 0 Drivers.

-32

tCLCL-10

Address valid after PSEN

tPXAV1)

tCLCL-5

Address to valid instruction in

tAVIV

-148

5tCLCL-60

Address float to PSEN

tAZPL

-10

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