TL/F/9507
54F/74F257A
Quad
2-Input
Multiplexer
with
TRI-STATE
Outputs
November 1994
54F/74F257A
Quad 2-Input Multiplexer with TRI-STATE Outputs
General Description
The ’F257A is a quad 2-input multiplexer with TRI-STATE
outputs. Four bits of data from two sources can be selected
using a Common Data Select input. The four outputs pres-
ent the selected data in true (non-inverted) form. The out-
puts may be switched to a high impedance state with a
HIGH on the common Output Enable (OE) input, allowing
the outputs to interface directly with bus-oriented systems.
Features
Y
Multiplexer expansion by tying outputs together
Y
Non-inverting TRI-STATE outputs
Y
Input clamp diodes limit high-speed termination effects
Y
Guaranteed 4000V minimum ESD protection
Commercial Military
Package
Package Description
Number
74F257APC N16E 16-Lead (0.300 Wide) Molded Dual-In-Line
54F257ADM (Note 2) J16A 16-Lead Ceramic Dual-In-Line
74F257ASC (Note 1) M16A 16-Lead (0.150 Wide) Molded Small Outline, JEDEC
74F257ASJ (Note 1) M16D 16-Lead (0.300 Wide) Molded Small Outline, EIAJ
54F257AFM (Note 2) W16A 16-Lead Cerpack
54F257ALL (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Note 1: Devices also available in 13 reel. Use suffix e SCX and SJX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB.
Logic Symbols Connection Diagrams
TL/F/9507–3
IEEE/IEC
TL/F/9507–5
Pin Assignment
for DIP, SOIC and Flatpak
TL/F/9507–1
Pin Assignment
for LCC
TL/F/9507–2
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.