74hct7030 NXP Semiconductors, 74hct7030 Datasheet - Page 20

• Manufacturer Part Number: 74hct7030
• Description: 9-bit X 64-word Fifo Register; 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
December 1990
9-bit x 64-word FIFO register; 3-state
(1) HC : V
Fig.21 FIFO to FIFO communication; output timing under full condition.
HCT: V
M
M
= 50%; V
= 1.3 V; V
I
I
= GND to V
= GND to 3 V.
CC
.
20
Notes to Fig.21
1. FIFO
2. Unload one word from FIFO
3. DIR
4. DOR
5. DOR
6. DIR
SI
shifting in new data as empty
location bubbles-up.
SO pulse applied, results in DOR
pulse.
(bubble-up delay after SO
data is loaded into FIFO
result of the DIR pulse, data is
shifted out of FIFO
indicates the output stage of
FIFO
complete.
indicates valid data is again
available at FIFO
SI
bubble-up of empty location.
delay after SO
location is present at input stage
of FIFO
B
B
held HIGH in anticipation of
B
is held HIGH, awaiting
A
A
A
A
A
and SO
goes HIGH; (bubble-up
74HC/HCT7030
and SI
and SI
and FIFO
is busy, shift-in to FIFO
A
.
Product specification
A
B
B
A
pulse HIGH;
go LOW; flag
go HIGH; flag
LOW) an empty
B
A
initially full,
A
output stage,
.
B
B
as a
LOW)
B
;
B
is