Rainbow-electronics DS1254 Manual do Utilizador descarregar pdf (Página 8)

DS1254

8 of 17

CAPACITANCE (T

A

= +25

°

C)

PARAMETER SYMBOL MIN TYP MAX UNITS

NOTES

Input Capacitance: A0–A18,

OE , WE ,CE

C

IN

25 50 pF

Input Capacitance: A19–A20 C

IN

5 10 pF

I/O Capacitance: DQ0–DQ7 C

IO

25 50 pF

Output Capacitance: BW

C

OUT

5 10 pF

AC ELECTRICAL CHARACTERISTICS (0

°

C to +70

°

C; V

CC

= 5.0V±10%)

PARAMETER SYMBOL MIN MAX UNITS NOTES

Read Cycle Time t

RC

100 nS

Address Access Time t

AAC

100 nS

OE to Output Valid

t

OE

55 nS

CE to Output Valid

t

CO

100 nS

CE or OE to Output Active

t

COE

5 nS 2

Output High-Z from Deselection t

OD

35 nS 2

Output Hold from Address Change t

OH

5 nS

Write Cycle Time t

WC

100 nS

WE , CE Pulse Width

t

WP

70 nS 5

Address Setup Time t

AW

0 nS

t

AH1

5 nS 6 Address Hold Time

t

AH2

25 nS 7

Output High-Z from WE

t

ODW

35 nS 2

Output Active fromWE

t

OEW

5 nS 2

Data Setup Time t

DS

40 nS 8

t

DH1

0 nS 6 Data Hold Time

t

DH2

20 nS 8

Read Recovery

(Clock Access Only)

t

RR

20 nS

Write Recovery

(Clock Access Only)

t

WR

20 nS

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