74HCT244D 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