74F657 Datasheet | National Semiconductor

Description The ’F657 contains eight non-inverting buffers with TRI-STATE outputs and an 8-bit parity generator checker It is intended for bus-oriented applications The buffers have a guaranteed current sinking capability of 24 m A (20 m A mil) at the A port and 64 m A (48 m A mil) at the B port Features Y 300 Mil 24-pin slimline DIP Y bines ’F245 and ’F280A functions in one package Y TRI-STATE outputs Y B Outputs sink 64 m A (48 m A mil) Y 12 m A source current B side Y Input diodes for termination effects mercial 74F657SPC 75F657SC (Note 1) Military 54F657SDM (Note 2) 54F657FM (Note 2) 54F657LM (Note 2) Package Number N24C J24F M24B W24C E28A Package Description 24-Lead (0 300 Wide) Molded Dual-In-Line 24-Lead (0 300 Wide) Ceramic Dual-In-Line 24-Lead (0 300 Wide) Molded Small Outline JEDEC 24-Lead Cerpack 24-Lead Ceramic Leadless Chip Carrier Type C Note 1 Devices also available in 13 reel Use suffix e SCX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB Logic Symbols IEEE IEC TL F 9584 - 1 TL F 9584 - 5 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 9584 RRD-B30M75 Printed in U S A Connection Diagrams Pin Assignment for DIP SOIC and Flatpak Pin Assignment for LCC Obsolete TL F 9584 - 3 TL F 9584- 2 Unit Loading Fan Out 54F 74F Pin Names Description UL HIGH LOW Input IIH IIL Output IOH IOL A0 - A7 B0 - B7 TR OE PARITY ODD EVEN ERROR Data Inputs TRI-STATE Outputs Data Inputs TRI-STATE Outputs Transmit Receive Input Enable Input Parity Input TRI-STATE Output ODD EVEN Parity Input Error Output 4 5 0 15 150 40 (33...