74HC7404D datasheet(6/28 Pages) PHILIPS

6 / 28 page

September 1993

Philips Semiconductors

Product speciﬁcation

5-Bit x 64-word FIFO register; 3-state

74HC/HCT7404

FUNCTIONAL DESCRIPTION

The DIR flag indicates the input stage

status, either empty and ready to

receive data (DIR = HIGH) or full and

busy (DIR = LOW). When DIR and SI

are HIGH, data present at D0 to D4 is

shifted into the input stage; once

complete DIR goes LOW. When SI is

set LOW, data is automatically shifted

to the output stage or to the last

empty location. A FIFO which can

receive data is indicated by DIR set

HIGH.

A DOR flag indicates the output stage

status, either data available

(DOR = HIGH) or busy

(DOR = LOW). When SO and DOR

are HIGH, data is available at the

outputs (Q0 to Q4). When SO is LOW

new data may be shifted into the

output stage, once complete DOR is

set LOW.

Expanded Format (see Fig.18)

The DOR and DIR signals are used to

allow the ‘7404’ to be cascaded. Both

parallel and serial expansion is

possible. Serial expansion is only

possible with typical devices.

Parallel Expansion

Parallel expansion is accomplished

by logically ANDing the DOR and DIR

signals to form a composite signal.

Serial Expansion

Serial expansion is accomplished by:

• tying the data outputs of the first

device to the data inputs of the

second device

• connecting the DOR pin of the first

device to the SI pin of the second

device

• connecting the SO pin of the first

device to the DIR pin of the second

device.

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: parallel outputs, bus driver; serial output, standard ICC category: MSI

Output capability: driver 8 mA

ICC category: LSI

Voltages are referenced to GND (ground = 0 V).

DC CHARACTERISTICS FOR 74HC

SYMBOL

PARAMETER

Tamb °C

UNIT

TEST CONDITION

+25

−40 to +85 −40 to +125

VCC

(V)

OTHER

MIN

TYP

MAX

MIN

MAX

MIN

MAX

VOH

HIGH level

output voltage

3.98

5.48

4.32

5.81

−

3.84

5.34

−

3.70

5.20

−

4.5

VIH

VIL

IO = −8 mA

IO = −10 mA

VOL

LOW level

output voltage

−

0.15

0.26

−

0.33

−

0.4

4.5

VIH

VIL

IO = 8 mA

IO = 10 mA

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