Samsung HT-DL200 Service Manual

Also see for HT-DL200: Instruction manual Instruction manual Instruction manual

Contents

8-2 Samsung Electronics2. 74VHC24474VHC244Octal Buffer/Line Driver with 3-STATE OutputsGeneral DescriptionThe VHC244 is an advanced high speed CMOS octal busbuffer fabricated with silicon gate CMOS technology. Itachieves high speed operation similar to equivalent BipolarSchottky TTL while maintaining the CMOS low power dissi-pation. The VHC244 is a non-inverting 3-STATE buffer hav-ing two active-LOW output enables. These devices aredesigned to be used as 3-STATE memory address drivers,clock drivers, and bus oriented transmitter/receivers.An input protection circuit ensures that 0V to 7V can beapplied to the input pins without regard to the supply volt-age. This device can be used to interface 5V to 3V systemsand two supply systems such as battery back up. This cir-cuit prevents device destruction due to mismatched supplyand input voltages.Features High Speed: tPD = 3.9ns (typ) at VCC = 5V High noise immunity: V NIH = VNIL = 28% V CC (min) Power down protection is provided on all inputs Low noise: V OLP = 0.6V (typ) Low power dissipation: I CC = 4 μA (max) @ T A = 25°C Pin and function compatible with 74HC244Ordering Code:Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ìXî to the ordering code.Logic SymbolIEEE/IECConnection DiagramPin DescriptionsOrder Number Package Number Package Description74VHC244M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300î Wide74VHC244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide74VHC244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide74VHC244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300î WidePin Names DescriptionOE 1 , OE2 3-STATE Output Enable InputsI0 ñI7 InputsO0 ñO 7 3-STATE Outputs