74ACT2708PC Fairchild Semiconductor, 74ACT2708PC Datasheet - Page 4

• Manufacturer Part Number: 74ACT2708PC
• Description: IC MEMORY FIRST OUT 64X9 28-DIP
• Manufacturer: Fairchild Semiconductor
• Series: 74ACTr

Specifications of 74ACT2708PC

• Function: Asynchronous, Synchronous
• Memory Size: 576 (9 x 64)
• Data Rate: 60MHz
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Access Time: -
• Other names: 74ACT2708

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MODES OF OPERATION
Mode 1: Shift in Sequence for FIFO Empty to Full
Sequence of Operation
1. Input Ready is initially HIGH; HF and FULL flags are
2. Shift-In is set HIGH, and data is loaded into the FIFO.
3. Input Ready (IR) goes LOW propagation delay t
Note: SO and OE are LOW; MR is HIGH.
LOW. The FIFO is empty and prepared for valid data.
OR is LOW indicating that the FIFO is not yet ready to
output data.
Data has to be settled t
and held t
SI goes HIGH: input stage is busy.
h
after.
s
before the falling edge of SI
FIGURE 1. Modes of Operation Mode 1
IR
after
4
4. Shift-In is set LOW; IR goes HIGH indicating the FIFO
5. The process is repeated through the 64th data word.
is ready for additional data. Data just shifted-in arrives
at output propagation delay t
HIGH propagation delay t
cating the FIFO has valid data on its outputs. HF goes
HIGH propagation delay t
FIFO is no longer empty.
On the rising edge of the 33rd SI, FULL flag goes HIGH
propagation delay t
FIFO. HF goes LOW propagation delay t
ing edge of the 64th pulse indicating that the FIFO is
full. Any further shift-ins are disabled.
IHF
after SI, indicating a half-full
IOR
IE
after SI falls, indicating the
OD5
after SI goes LOW, indi-
after SI falls. OR goes
IF
after the ris-