L8C201/202/203/204
DEVICES INCORPORATED
512/1K/2K/4K x 9-bit Asynchronous FIFO
SWITCHING CHARACTERISTICS Over Commercial and Industrial Operating Range
FULL/EMPTY FLAG AND RETRANSMIT TIMING (ns)
L8C201/202/203/204–
25
15
12
10
Symbol Parameter
Min Max Min Max Min Max Min Max
tRLQV
tRLEL
tRHFH
tWHEH
tWLFL
tTLAL
tTLTH
tAHTH
tTHAL
Read Low to Output Valid (Access Time)
25
25
25
25
25
15
15
15
15
15
12
12
12
12
12
10
10
10
10
10
Read Low to Empty Flag Low
Read High to Full Flag High
Write High to Empty Flag High
Write Low to Full Flag Low
Retransmit Cycle Time
35
25
25
10
25
15
15
10
20
12
12
8
15
10
10
5
Retransmit Low to End of Retransmit Cycle (Notes 8, 9, 10)
Read/Write High to Retransmit High (Notes 8, 9, 10)
Retransmit High to Read/Write Low (Note 9)
FULL FLAG FROM LAST WRITE TO FIRST READ
LAST WRITE
IGNORED
WRITE
FIRST READ
ADDITIONAL ADDITIONAL
READS
WRITES
R
W
tWLFL
tRHFH
FF
EMPTY FLAG FROM LAST READ TO FIRST WRITE
LAST READ
IGNORED
READ
FIRST WRITE
ADDITIONAL
WRITES
FIRST READ
W
R
t
RLEL
tWHEH
EF
tRLQV
DATA
OUT
VALID
VALID
RETRANSMIT
tTLAL
t
TLTH
RT
W, R
OBSOLETE
t
AHTH
tTHAL
HF, EF, FF
FLAG VALID
FIFO Products
03/04/99–LDS.8C201/2/3/4-H
6
LOGIC [ LOGIC DEVICES INCORPORATED ]
