74LS244 Datasheet PDF – Octal 3-STATE Buffer / Line Driver

Part Number: 74LS244

Function: Octal Buffer / Line Driver / Line Receiver

Package: DIP, SOP 20 Pin Type

Manufacturer: Fairchild Semiconductor


The 74LS244, DM74LS244N buffers/line drivers are designed to improve both the performance and PC board density of 3-STATE buffers/drivers employed as memory-address drivers, clock drivers, and bus-oriented ransmitters/receivers.

Featuring 400mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133W.

Pinout and Ordering Information :

74LS244 Pinout and 74LS244 datasheet


1.  3-STATE outputs drive bus lines directly

2.  PNP inputs reduce DC loading on bus lines

3.  Hysteresis at data inputs improves noise margins

4.  Typical IOL (sink current) 24 mA

5.  Typical IOH (source current)  -15 mA

6. Typical propagation delay times :
(1) Inverting 10.5 ns
(2) Noninverting 12 ns

7. Typical enable/disable time 18 ns

8. Typical power dissipation (enabled)
(1) Inverting 130 mW
(2) Noninverting 135 mW

Part Number: DM74LS244WM, DM74LS244SJ,DM74LS244N

74LS244 Datasheet PDF

74LS244 Fairchild pdf