74HCT244N NXP

74HC244; 74HCT244 Octal buffer/line driver; 3-state Rev. 4 24 September 2012 Product data sheet 1. General description The 74HC244; 74HCT244 is an 8-bit buffer/line driver with 3-state outputs. The device can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of V . CC 2. Features and benefits Input levels: For 74HC244: CMOS level For 74HCT244: TTL level Octal bus interface Non-inverting 3-state outputs Complies with JEDEC standard no. 7 A ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Multiple package options Specified from 40 Cto +85 C and 40 Cto +125 C 3. Ordering information Table 1. Ordering information Type number Package Temperature range Name Description Version 74HC244N 40 Cto+125 C DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1 74HCT244N 74HC244D 40 Cto+125 C SO20 plastic small outline package; 20 leads; SOT163-1 body width 7.5 mm 74HCT244D 74HC244DB 40 Cto+125 C SSOP20 plastic shrink small outline package; 20 leads; SOT339-1 body width 5.3 mm 74HCT244DB 74HC244PW 40 Cto+125 C TSSOP20 plastic thin shrink small outline package; 20 leads; SOT360-1 body width 4.4 mm 74HCT244PW 74HC244BQ 40 C to +125 C DHVQFN20 plastic dual-in-line compatible thermal enhanced SOT764-1 very thin quad flat package; no leads; 20 terminals; 74HCT244BQ body 2.5 4.5 0.85 mm74HC244; 74HCT244 NXP Semiconductors Octal buffer/line driver; 3-state 4. Functional diagram 1A0 1Y0 2 18 1A1 1Y1 4 16 1Y2 1A2 6 14 1A3 1Y3 8 12 1OE 1 2A0 2Y0 17 3 2A1 2Y1 15 5 2A2 2Y2 13 7 2Y3 2A3 11 9 2OE 19 mna875 Fig 1. Functional diagram 1 EN 2 17 18 3 18 2 1A0 1Y0 2A0 2Y0 16 4 4 15 14 16 5 6 1A1 1Y1 2A1 2Y1 8 12 6 13 14 7 1A2 2A2 1Y2 2Y2 19 EN 8 12 11 9 1A3 1Y3 2A3 2Y3 11 9 1 19 7 1OE 2OE 13 mna874 15 5 17 3 mna873 Fig 2. Logic symbol Fig 3. IEC logic symbol 74HC_HCT244 All information provided in this document is subject to legal disclaimers. NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 24 September 2012 2 of 18