HCMOS FAMILY CHARACTERISTICS PDF

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HCMOS Hcmos Family Characteristics. GENERAL These family specifications cover the common electrical ratings and characteristics of the entire HCMOS. HCMOS (“high-speed CMOS”) is the set of specifications for electrical ratings and characteristics, forming the 74HC00 family, a part of the series of. the HCMOS data sheets are guaranteed when the circuits are tested according to the conditions stated in the chapter. ‘Family Characteristics’, section ‘Family.

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Details of each of these modes are illustrated in the following pages. GND Supply voltage; for a device with a single negative power supply, the most negative power supply, used chraacteristics the reference level for other voltages; typically ground. It is organized with words of 8 bits in length, and operates with a single 5V power supply.

Because of this feedback path usage, pin 19 and pin 12 do not have the feedback option in this mode. Sequence Clear reset outputs to zero ; load preset to binary thirteen; count up to fourteen, fifteen, terminal count up, zero, one and two; count down to one, zero, terminal count down, fifteen, Fig.

An important subset of the many architecture configurations possible with the GAL16V8 are the PAL architectures listed in the table of the macrocell description section. IO Output source or sink current: The different device types listed in the table can be used to override the automatic device selection by the software.

HCMOS family characteristics FAMILY SPECIFICATIONS

All brand or product names are trademarks or registered trademarks of their respective holders. These device types are listed in the table below. These are stress ratings only. The device can be cleared at any time by characteristcis asynchronous master reset input MR ; it may also be loaded in parallel by activating the asynchronous parallel load input PL.

HCMOS family characteristics FAMILY SPECIFICATIONS

There are three global OLMC configuration modes possible: Information present on the parallel data inputs D0 to D3 is loaded into the hcaracteristics and appears on the outputs Q0 to Q3 regardless of the conditions of the clock inputs when the parallel load PL input is LOW.

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The specifications and information herein are subject to change without notice.

For analog switches, e. CL Output load capacitance; the capacitance connected to an output terminal including jig and probe capacitance. It is operated from a power supply of 2 to 6 V. The development software configures all of the architecture control bits and checks for proper pin usage automatically.

The Data bus of the HT is designed as a tri-state type. Device inputs are conditioned to establish a LOW level at the output. Negative current is defined as conventional current flow out of a device.

During a write cycle, the data pins are defined as the input state by setting the WE pin to low. The information given on these architecture bits is only to give a better understanding of the device. VCC Supply voltage; the most positive potential on the device.

If one of the clock inputs is LOW during and after a reset or load operation, the next LOW-to-HIGH transition of that clock will be interpreted as a legitimate signal and will be counted. The terminal count outputs can be used as the clock input signals to the next higher order circuit in a multistage counter, since they duplicate the clock waveforms.

All data pins are defined as a three-state type, controlled by the OE pin. H stands for high level L stands for low level. A write cycle occurs during the overlap of a low CS and a low WE 2.

For further details, refer to the compiler software manuals.

74HCT Datasheet pdf – HCMOS family characteristics – Philips

Charscteristics counter may be preset by the asynchronous parallel load capability of the circuit. In simple mode all feedback paths of the output pins are routed via the adjacent pins. Analog terms IOK Output diode current; the current flowing charactreistics a device at a specified output voltage. These pins cannot be configured as dedicated inputs in the registered mode. Compiler software will transparently set these architecture bits from the pin definitions, so the user should not need to directly manipulate these architecture bits.

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When using compiler software to configure the device, the user must pay special attention familt the following restrictions in each mode. All combinatorial outputs with OE controlled by the product term will force the software to choose the complex mode. Multistage counters will not be fully synchronous, since there is a slight delay time difference added for each stage that is added.

CS Switch capacitance; the capacitance of a terminal to a switch of an analog device. Documents Flashcards Grammar checker. Applications requiring reversible operation must make the reversing decision while the activating clock is HIGH to avoid erroneous counts.

VOL LOW level output voltage; the range of voltages at an output terminal with a specified output loading and supply voltage.

Data should be ready before the familh edge of the WE pin according to the timing of the writing cycle. In doing so, the two inner most pins pins 15 and 16 will not have the feedback option as these pins are always configured as dedicated combinatorial output. Device inputs are conditioned to establish a HIGH level at the output.

March 17 CI Input capacitance; the capacitance measured at a terminal connected to an input of a device. These two global and 16 individual architecture bits define all possible configurations in a GAL16V8.

Fa,ily Power dissipation capacitance; the capacitance used to determine the dynamic power dissipation per logic function, when no extra load is provided to the device.

Register usage on the device forces the software to choose the registered mode. The software will choose the simple mode only when all outputs are dedicated combinatorial without OE control. The family will have the same pin-out as the 74 series and provide the same circuit functions.