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74HC7404D Datasheet(PDF) 6 Page - NXP Semiconductors |
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74HC7404D Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 28 page September 1993 6 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) VI 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 − − V V 4.5 6 VIH or VIL IO = −8 mA IO = −10 mA VOL LOW level output voltage − − 0.15 0.15 0.26 0.26 − − 0.33 0.33 − − 0.4 0.4 V V 4.5 6 VIH or VIL IO = 8 mA IO = 10 mA |
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