DM74ALS257M

Mounting Style : SMD/SMT
Package / Case : SOIC-16
Supply Voltage - Max : 5.5 V
Supply Voltage - Min : 4.5 V
Number of Bits : 4
Packaging : Tube
Product : Decoders, Encoders, Multiplexers & Demultiplexers
Maximum Operating Temperature : + 70 C
Number of Lines (Input / Output) : 1 / 2
Propagation Delay Time : 12 ns at 4.5 V to 5.5 V
Logic Family : 74ALS


Features:

·  Switching specifications at 50 pF
·  Switching specifications guaranteed over full temperature and VCC range
·  Advanced oxide-isolated, ion-implanted Schottky TTL process
·  Functionally and pin for pin compatible with Schottky
   and low power Schottky TTL counterpart
·  Improved AC performance over Schottky and low power
   Schottky counterparts
·  3-STATE buffer-type outputs drive bus lines directly
·  Expand any data input point
·  Multiplex dual data buses
·  General four functions of two variables (one variable is common)
·  Source programmable counters


Pinout




Specifications

Supply Voltage........................................................... 7V
Input Voltage .............................................................7V
Voltage Applied to Disabled Output ........................5.5V
Operating Free Air Temperature Range ....0°C to +70°C
Storage Temperature Range ...............-65°C to +150°C
Typical qJA
N Package ......................................................73.0°C/W
M Package ....................................................102.0°C/W
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.


Description

These DM74ALS257M data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four 3- STATE outputs that can interface directly with data lines of bus-organized systems. A 4-bit word selected from one of two sources is routed to the four outputs. The DM74ALS257M presents true data whereas the DM74ALS258 presents inverted data to minimize propagation delay time.

This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses. It also permits the use of standard TTL registers for data retention throughout the system.

Parameters:

Technical/Catalog Information	DM74ALS257M
Vendor	Fairchild Semiconductor
Category	Integrated Circuits (ICs)
Circuit	4 x 2:1
Independent Circuits	1
Mounting Type	Surface Mount
Current - Output High, Low	2.6mA, 24mA
Package / Case	16-SOIC
Packaging	Tube
Type	Data Selector/Multiplexer
Voltage Supply Source	Single Supply
Operating Temperature	0°C ~ 70°C
Voltage - Supply	4.5 V ~ 5.5 V
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	DM74ALS257M DM74ALS257M