74HC7403 Datasheet, PDF (22/28 Pages) NXP Semiconductors – 4-Bit x 64-word FIFO register; 3-state

Philips Semiconductors
4-Bit x 64-word FIFO register; 3-state
Product specification
74HC/HCT7403
handbook, full pagewidth
DATA INPUT
4
COMPOSITE
DIR
FLAG
SI
MR
Dn
Qn
4
DIR DOR
7403
SI
SO
MR
OE
DATA OUTPUT
COMPOSITE
DOR
FLAG
SO
OE
DATA INPUT
4
DIR DOR
SI
SO
7403
MR
OE
Dn
Qn
4
MGA678
DATA OUTPUT
Fig.18 Expanded FIFO for increased word length; 64 words x 10 bits.
Note to Fig.18
The “7403” is easily expanded to increase word length. Composite DIR and DOR flags are formed with the addition of
an AND gate. The basic operation and timing are identical to a single FIFO, with the exception of an added gate delay
on the flags.
September 1993
22