M74HCT648

M74HCT646 M74HCT648 HCT646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE) HCT648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.) . . . . . . . HIGH SPEED fMAX = 60 MHz (TYP.) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.) AT TA = 25 °C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.8V (MAX) OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE IOH= IOL = 6 mA (MIN.) BALANCED PROPAGATION DELAYS tPLH = tPHL PIN AND FUNCTION COMPATIBLE WITH 54/74LS646/648 B1R (Plastic Package) M1R (Micro Package) ORDER CODES : M74HCTXXXM1R M74HCTXXXB1R DESCRIPTION The M74HCT646/648 are high speed CMOS OCTAL BUS TRANSCEIVERS AND REGISTERS, 2 (3-STATE) fabricated in silicon gate C MOS technology. They have the same high speed performance of LSTTL combined with true CMOS low power consumption. These devices consist of bus transceiver circuits with 3-state output, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus will be clocked into the registers on the lowto-high transition of the appropriate 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 multiplex stored and real-time (transparent mode) data. The direction control determines ...