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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For analog switches, e. Details of each of these modes are illustrated in the following pages.
HCMOS family characteristics FAMILY SPECIFICATIONS
IIK Input diode current; the current flowing into a device at a specified input voltage. Lab 9 in this note. Data should be ready before the rising edge of the WE pin according to the timing of the writing cycle. A read occurs during the overlap of a low CS and a high WE 2.
The development software configures all of the architecture control bits and checks for proper pin usage automatically. A fwmily cycle occurs during the overlap of a low CS and a low WE 2. The counter may be preset by the asynchronous parallel load capability of the circuit. 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. Information present on the parallel data inputs D0 to D3 is loaded into the counter and chaaracteristics on the outputs Q0 to Q3 regardless of the characteristiics of the clock inputs when the parallel load PL input is LOW.
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. These device types are listed in the table below.
74HCT Datasheet pdf – HCMOS family characteristics – Philips
Compiler software will transparently set these architecture bits from the pin definitions, so the user should not need to directly manipulate these architecture bits. Charscteristics doing so, the fxmily inner most pins pins 15 and 16 will not have the feedback option as these pins are always configured as dedicated combinatorial output. 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 to the device.
Functional operation of this device at these or any other conditions above those vharacteristics in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extended periods may affect device reliability. VH Hysteresis voltage; difference between the trigger levels, when applying a positive and a negative-going input signal.
VCC Supply voltage; the most positive potential on the device. 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.
VOH HIGH level output voltage; charactefistics range of voltages at an output terminal with a specified output loading and supply voltage. Register usage on the device forces the software to choose the registered mode. CS Switch capacitance; the capacitance of a terminal to a switch of an analog device. Negative current is defined as conventional current flow out of a device. In simple mode all feedback paths of the output pins characterustics routed via the adjacent pins.
These two global and 16 individual architecture bits define all possible configurations in a GAL16V8. OE may be both high and low in a write cycle chxracteristics. It is operated from a power supply of 2 to 6 V. 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. March 17 CI Input capacitance; the capacitance measured at a terminal connected to an input of a device.
Device inputs are conditioned to establish a LOW level at the output. IS Analog switch leakage current; the current flowing into an analog switch at a specified voltage across the switch ramily VCC. H stands for high level L stands for low level.
Most compilers have the ability to automatically select the device type, generally based on the register usage and output enable OE usage. ON-resistance; the effective ON-state resistance of an analog switch, at a specified voltage across the switch and output load. It is organized with words of 8 bits in length, and operates with a single 5V power supply.
The specifications and information herein are subject to change without notice. Registered outputs have eight product terms per output. The software will choose the simple mode only when all outputs are dedicated combinatorial without OE control. When using compiler software to configure the device, the user must pay special attention to the following restrictions in each mode.
The different device types listed in the table can be used to override the automatic device selection by the software. All brand or product names are trademarks or registered trademarks of their respective holders. VOL LOW level output voltage; the range of voltages at an output terminal with a specified output loading and supply voltage. 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.
These are stress ratings only. In complex mode pin 1 and pin 11 become dedicated inputs and use the feedback paths of pin 19 and pin 12 respectively. 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.