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.
|Published (Last):||1 February 2013|
|PDF File Size:||18.48 Mb|
|ePub File Size:||5.41 Mb|
|Price:||Free* [*Free Regsitration Required]|
Documents Flashcards Grammar checker. The family will have the same pin-out hcmo the 74 series and provide the same circuit functions. In these families are included several HEB family circuits which do not have TTL counterparts, and some special circuits. It is operated from a power supply of 2 to 6 V.
For analog switches, e. Negative current is defined as conventional current flow out of a device. IIK Input diode current; the current flowing into a device at a specified input voltage. IO Output source or sink current: VOH HIGH level output voltage; the range of voltages at an output terminal with a charwcteristics output loading and supply voltage. Device inputs are conditioned to establish a HIGH level at the output. VOL LOW level charactreistics voltage; the range of voltages at an output terminal with a specified output loading and supply voltage.
Device inputs are conditioned to establish a LOW level at the output.
74HCT Datasheet pdf – HCMOS family characteristics – Philips
Analog terms IOK Output diode current; the current flowing into a device at a specified output voltage. ON-resistance; the effective ON-state resistance of an analog switch, at a specified voltage across the switch and output load. IS Analog switch leakage current; the current flowing into an analog switch at a specified voltage across the switch and VCC.
GND Supply voltage; for a device with a single charateristics power supply, the most negative power supply, used as the reference level for other voltages; typically ground. VCC Supply voltage; the most positive potential on the device. VH Hysteresis voltage; difference between the trigger levels, when applying a positive and a negative-going input signal.
March 17 CI Input capacitance; the 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. 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. CS Switch characteristicd the capacitance of a terminal to a switch of an analog device.
Applications requiring reversible operation must make the reversing decision while the activating clock is HIGH to avoid erroneous counts.
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. Multistage counters will not be fully synchronous, since there is a slight delay time difference added for each stage that is added.
Only one clock input can be held HIGH at any time, or erroneous operation will result. 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. The counter may be preset by the asynchronous parallel load capability of the circuit.
Information present on the parallel data inputs D0 to D3 is loaded into the counter chraacteristics appears on the outputs Q0 to Q3 regardless of the conditions of the clock inputs when the parallel load PL input is LOW. 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. Sequence Clear reset outputs to zero ; load preset to binary thirteen; count up cuaracteristics fourteen, fifteen, terminal count up, zero, one and two; count down to one, zero, terminal count down, fifteen, Fig.
It is organized with words of 8 bits in length, and operates with a single 5V power supply.
HCMOS – Wikipedia
The Data bus of the Characterisyics is designed as a famiky type. The chip is in the active mode, if CS is low. These are stress ratings only. 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. A read occurs during the overlap of a low CS and a high WE 2.
A write cycle occurs during the overlap of a low CS and a low WE 2.
OE may be both high and low in a write cycle charxcteristics. During a write cycle, the data pins are defined as the input state by setting the WE pin to low. Data should be ready before the rising edge of the WE pin according to the timing of the writing cycle.
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. 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.
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. All brand or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice. There are three global OLMC configuration modes possible: Details of each of these modes are illustrated in the following pages. These two global and 16 individual architecture bits define all possible configurations in a GAL16V8.
HCMOS family characteristics FAMILY SPECIFICATIONS
The information given on these architecture bits is only to give a better understanding of the device. Compiler software will transparently set these architecture bits from the pin definitions, so the user should not need to directly manipulate these architecture bits. These device types are listed in the table below. Most compilers have the ability to automatically select the device type, generally based on the register usage tamily output enable OE usage.
Register usage on the device forces the software to choose the registered mode. All combinatorial outputs with OE controlled by the product term will force the software to choose the complex mode. The software will choose the simple mode only when all outputs are dedicated combinatorial without OE control.
The different device types listed in the table can be used to override the automatic device selection by the software. For further details, refer to the compiler software manuals. These pins cannot be configured as dedicated inputs in the charracteristics mode. In complex mode pin 1 and pin 11 become dedicated inputs and use the feedback characetristics of pin 19 and pin 12 respectively. Because of this feedback path usage, pin 19 and pin 12 do not have the feedback option in this mode.
In simple mode all feedback paths of the output pins are routed via the adjacent pins. 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.
When using compiler software to configure the device, the user must pay special attention to the following restrictions in each mode.
Registered outputs have eight product terms per output. All registered macrocells share common clock and output enable control pins. The development software configures all of the architecture control bits and checks for proper pin usage automatically.
Lab 9 in this note.