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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All data pins are defined as a three-state type, controlled by the OE pin. These two global and 16 individual architecture characteeistics define all possible configurations in a GAL16V8.
Applications requiring reversible operation must make the reversing decision while the activating clock is HIGH to avoid erroneous counts. Multistage counters will not be fully synchronous, since there is a slight delay time difference added for each stage that is added. Documents Flashcards Grammar checker.
HCMOS family characteristics FAMILY SPECIFICATIONS
There are three global OLMC configuration modes possible: The software will choose the simple mode only when all outputs are dedicated combinatorial without OE control. All combinatorial outputs with OE controlled by the product term will force the software to choose the complex mode.
GND Supply voltage; for hdmos device with a single negative power supply, the most negative power charxcteristics, used as the reference level for other voltages; typically ground. In simple mode all feedback paths of the output pins are routed via the adjacent pins.
These device types are listed in the table below. Details of each of these modes are illustrated in the following pages. Data should be ready before the rising edge of the WE pin according characteriistics the timing of the writing cycle. March 17 CI Input capacitance; fharacteristics capacitance measured at a terminal connected to an input of a device.
CL Output load capacitance; the capacitance connected to an output terminal including jig and probe capacitance. Analog terms IOK Output diode current; the current flowing into a device at a specified output voltage.
74HCT Datasheet pdf – HCMOS family characteristics – Philips
Characteriatics LOW level output voltage; the range of voltages at an output terminal with a specified output loading and supply voltage. A write cycle occurs during the overlap of a low CS and a low WE 2.
The device can be cleared at any time characterisyics the asynchronous master reset input MR ; it may also be loaded in parallel by activating the asynchronous parallel load input PL.
Information present on the parallel data inputs D0 to D3 is loaded into the counter and appears on the outputs Q0 to Q3 regardless of the conditions of the clock inputs when the parallel load PL input is LOW. While in the read cycle, the WE pin is set to high and the OE pin is set to low characteristivs define the charaacteristics pins as the output state. Only one clock input can be held HIGH at any time, or erroneous operation will result.
In complex mode pin 1 and pin 11 become dedicated inputs and use the feedback paths of pin 19 and pin 12 respectively.
VCC Supply voltage; the most positive potential on the device. For analog switches, e. The Data bus of the HT is designed as a tri-state type. Device inputs are conditioned to establish a HIGH level at the output. VOH HIGH level output voltage; the charcateristics of voltages at an output terminal with a specified output loading and supply voltage.
When using compiler software chraacteristics configure the device, the user must pay special attention to the following restrictions in each mode. Fsmily software will transparently set these architecture bits from the pin definitions, so the user should not need to directly manipulate these architecture bits.
IS Analog switch leakage current; the current flowing into an analog switch at a specified voltage across the switch and VCC.
Device inputs are conditioned to establish a LOW level at the output. VH Hysteresis voltage; difference between the trigger levels, when applying a positive and a negative-going input signal. These are stress ratings only. Registered outputs have eight product terms per output. H stands for high level L stands for low level.
These pins cannot be configured as dedicated inputs in the registered mode. A read occurs during the overlap of a low CS and a high WE 2. Because of this feedback path usage, pin 19 and pin 12 do not have the feedback option in this mode. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extended periods may affect device reliability.
HCMOS family characteristics FAMILY SPECIFICATIONS
The different device types listed in the table can be used to override the automatic device selection by the software. CS Switch capacitance; the capacitance of a terminal to a switch of an analog device. In these families are included several HEB family circuits which do not have TTL counterparts, and some special circuits. The counter may be preset by the asynchronous parallel load capability of the circuit.
The information given on these architecture bits is only to give a better understanding of the device.
Most compilers have the ability to automatically select the device type, generally based ffamily the register usage and output enable OE usage. 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 registered macrocells share common clock and output enable control pins. CPD Power dissipation capacitance; the capacitance used to determine the dynamic power dissipation per logic function, when no extra load is provided characterietics the device.
The specifications and information herein are subject to change without notice. For further details, refer to the compiler software manuals. IO Output source or sink current: 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.
IIK Input diode current; the current flowing into a device at a specified input voltage. The family will have the same pin-out as the 74 series and provide the same circuit functions. The development software configures all of the architecture control bits and checks for proper pin usage automatically.