HMS99C52 datasheet(31/43 Pages) HYNIX

31 / 43 page

HMS99C5X Series

Jan. 2003 Ver 1.0

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 HMS99C5X series (12MHz version)

External Program Memory Characteristics

† Interfacing the HMS99C5X series to devices with float times up to 75 ns is permissible. This limited bus contention will not

cause any damage to port 0 Drivers.

VCC= 5V :

VCC= 5V + 10%, − 15%; VSS= 0V; TA= -40°C to 85°C

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

Variable clock :

Vcc = 5V : 1/tCLCL = 3.5 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

Address to valid instruction in

tAVIV

-302

5tCLCL-115

Address float to PSEN

tAZPL

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

HMS99C52 Datasheet(PDF) 31 Page - Hynix Semiconductor

HMS99C52 Datasheet(HTML) 31 Page - Hynix Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Datasheet Download

Link URL