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M74HC646 Fiches technique(PDF) 1 Page - STMicroelectronics |
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M74HC646 Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 12 page M74HC646 M74HC648 October 1993 HC648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.) HC646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE) B1R (Plastic Package) ORDER CODES : M74HCXXXM1R M74HCXXXB1R M1R (Micro Package) INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN CONNECTIONS (top view) GAB, GAB, CAB, A, B SAB, SBA, CBA . HIGH SPEED fMAX = 73 MHz (TYP.) AT VCC =5 V . LOW POWER DISSIPATION ICC =4 µA (MAX.) AT TA =25 °C . HIGH NOISE IMMUNITY VNIH =VNIL =28 % VCC (MIN.) . OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS . SYMMETRICAL OUTPUT IMPEDANCE IOH=IOL = 6 mA (MIN.) . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS646/648 DESCRIPTION The M74HC646/648 are high speed CMOS OCTAL BUS TRANSCEIVERS AND REGISTERS, (3- STATE) fabricated in silicon gate C 2MOS technol- ogy. They have the same high speed performance of LSTTL combined with true CMOS low power con- sumption. These devices consist of bus transceiver circuits with 3-state output, D-type flip-flops, and control cir- cuitry arranged for multiplexed transmission of data directly from the input bus or from the internal reg- isters. Data on the A or B bus will be clocked into the registers on the low-to-high transition of the appro- priate clock pin (Clock AB - or Clock BA). Enable (G) and direction (DIR) pins are provided to control the transceiver functions. In the transceiver mode, data present at the high-impedance port may be stored in either register or in both. The select controls (Select AB select BA) can multi- plex stored and real-time (transparent mode) data. The direction control determines which bus will re- ceive data when enable G is active (low). In the isolation mode (enable G high), ”A” data may be stored in one register and/or ”B” data may be stored in the other register. When an output function is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two buses, A or B, may be driven at a time. All inputs are equipped with protection circuits 1/12 |
Numéro de pièce similaire - M74HC646 |
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Description similaire - M74HC646 |
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