74hct7403 NXP Semiconductors, 74hct7403 Datasheet - Page 22

• Manufacturer Part Number: 74hct7403
• Description: 4-bit X 64-word Fifo Register; 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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
handbook, full pagewidth
4-Bit x 64-word FIFO register; 3-state
COMPOSITE
DATA INPUT
DATA INPUT
Fig.18 Expanded FIFO for increased word length; 64 words x 10 bits.
FLAG
DIR
MR
SI
4
4
SI
SI
DIR
DIR
MR
MR
D n
D n
7403
7403
22
MGA678
DOR
DOR
Q n
SO
OE
SO
OE
Q n
4
4
SO
OE
DATA OUTPUT
DATA OUTPUT
COMPOSITE
FLAG
DOR
74HC/HCT7403
Product specification