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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VCC Supply voltage; the most positive potential on the device. All data pins are defined as a three-state type, controlled by the OE pin. The different device types listed in the table can be used to override the automatic device selection by the software. Compiler software will transparently set these architecture bits from the pin definitions, so the user should not need to directly manipulate these architecture bits.
In complex mode pin 1 and pin 11 become dedicated inputs and use the feedback paths of pin 19 and pin 12 respectively.
IIK Input diode current; the current flowing into chraacteristics device at a specified input voltage. 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.
The counter may be preset by the asynchronous parallel load capability of the circuit.
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, characteristic, Fig.
Device inputs are conditioned to establish a LOW level at the output. In these families are included several HEB family circuits which do not have TTL counterparts, and some special circuits. All brand or product names are trademarks or registered trademarks of their respective holders.
VOH HIGH level output voltage; the range of voltages at an output terminal with a specified output loading and supply voltage. The chip is in the active mode, if CS is low. In simple mode all feedback paths of the output pins are routed via the adjacent pins.
Lab 9 in this note.
HCMOS family characteristics FAMILY SPECIFICATIONS
While in the read cycle, the WE pin is set to high and the OE pin is set to low to define the data pins as the output state.
Registered outputs chaacteristics eight product terms per output. IS Analog switch leakage current; the current flowing into an analog switch at a specified voltage across the switch and VCC. The development software configures all of the architecture control bits and checks for proper pin usage automatically. Negative current characterisfics defined as conventional current flow out of a device. ON-resistance; the effective ON-state resistance of an analog switch, at a specified voltage across the switch and gcmos load.
Chagacteristics of this feedback path usage, pin 19 and pin 12 do not have the feedback option in this mode. Information present on the parallel data inputs D0 to D3 is loaded into the counter and appears on the outputs Hcms to Q3 regardless of the conditions of the clock inputs when the parallel load PL input is LOW.
These device types are listed in the table below. These pins cannot be configured as dedicated inputs in the registered mode. Device inputs are conditioned to establish a HIGH level at the output.
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.
HCMOS – Wikipedia
These are stress ratings only. A read occurs during the overlap of a low CS and a high WE 2.
Details of each of these modes are illustrated in the following pages. The Data hhcmos of the HT is designed as a tri-state type. These two global and 16 individual architecture bits define all possible configurations in a GAL16V8. For further details, refer to the compiler software manuals. March 17 CI Input capacitance; the capacitance measured at a terminal connected to an input of a device.
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. The device can be cleared at any time by the asynchronous master reset input MR ; it may also be loaded in parallel by activating the asynchronous parallel load input PL.
IO Output source or sink current: 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. Most compilers have the ability to automatically select the device type, generally based on the register usage and output enable OE usage.
When using compiler software to configure the device, the user must pay special attention to the following restrictions in each mode. OE may be both high and low in a write cycle 3.
HCMOS family characteristics FAMILY SPECIFICATIONS
CPD Power dissipation capacitance; the capacitance used to determine the dynamic power dissipation per logic function, when no extra load is provided to the device. Applications requiring reversible operation must make the reversing decision while the activating clock is HIGH to avoid erroneous counts. Analog terms IOK Output diode current; the current flowing into a device at a specified output voltage.
Multistage counters will not be fully synchronous, since there is a slight delay time characteristicd added for each stage that is added. CL Output load capacitance; the capacitance connected to an output terminal including jig and probe capacitance.
Register usage on the device forces the software to choose the registered mode.