74LVCH244A OCTAL BUFFER/LINE DRIVER WITH BUS HOLD / 3 STATE OUTPUTS Description Pin Assignments The 74LVCH244A provides two 4-bit line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. The device is designed for operation with a power supply range of 1.65V to 3.6V. The inputs are tolerant to 5.5V allowing this device to be used in a mixed voltage environment. The device is fully specified for partial power down applications using I . The I circuitry disables the OFF OFF output preventing damaging current backflow when the device is powered down. Bus hold circuitry holds unused or un-driven inputs at a high or low logic state. The use of external pull-up or pull down resistors is not recommended. Applications Features General Purpose Logic Supply Voltage Range from 1.65V to 3.6V Sinks or Sources 24mA at V = 3V Bus Driving CC CMOS Low Power Consumption Power Down Signal Isolation I Supports Partial-Power Down Operation Wide array of products such as: OFF Inputs or Outputs Accept up to 5.5V PCs, Notebooks, Netbooks, Ultrabooks Inputs Can be Driven by 3.3V or 5V Allowing for Mixed Voltage Networking Computer Peripherals, Hard Drives, CD/DVD Applications ROM Schmitt Trigger Action at All Inputs TV, DVD, DVR, set top box Typical V (Quiet Output Ground Bounce) less than 0.8V with OLP V = 3.3V and T = +25C CC A Typical V (Quiet Output Dynamic VOH) greater than 2.0V OHV with V = 3.3V and T = +25C CC A ESD Protection Tested per JESD 22 Exceeds 200-V Machine Model (A115) Exceeds 2000-V Human Body Model (A114) Exceeds 1000-V Charged Device Model (C101) Latch-Up Exceeds 250mA per JESD 78, Class I Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See 74LVCH244A Ordering Information 74 LVC H244A xxx -13 Logic Device Function Package Packing 74 : Logic Prefix H244 : OCTAL T20 : TSSOP-20 -13 : 13 Tape & Reel BUFFER/LINE Q20 : QFN-20 DRIVER WITH BUS HOLD / 3 STATE OUTPUTS 13 Tape and Reel Package Package Package Part Number Code (Notes 4 & 5) Size Quantity Part Number Suffix 6.4mm X 6.5mm X 1.2mm 74LVCH244AT20-13 T20 TSSOP-20 2500/Tape & Reel -13 0.65 mm lead pitch 2.5mm X 4.5mm X 0.95mm 74LVCH244AQ20-13 Q20 V-QFN4525-20 2500/Tape & Reel -13 0.50 mm lead pitch Notes: 4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at