There are no models available for this part yet.
Overview of DM74LS491N by National Semiconductor Corporation
Note: Data for a part may vary between manufacturers. You can filter for manufacturers on the top of the page next to the part image and part number.
- Distributor Offerings: ( 2 listings )
- Number of FFF Equivalents: ( 7 replacements )
- CAD Models: ( Request Part )
- Number of Functional Equivalents: ( 7 options )
- Part Data Attributes ( Available )
- Reference Designs: ( Not Available )
Where used in Applications:
Education and Research
Space Technology
Aerospace and Defense
Automotive
Price & Stock for DM74LS491N by National Semiconductor Corporation
| Part # | Manufacturer | Description | Stock | Price | Buy | ||
|---|---|---|---|---|---|---|---|
| Quest Components | BINARY COUNTER, LS SERIES, SYNCHRONOUS, POSITIVE EDGE TRIGGERED, 10-BIT, BIDIRECTIONAL, TTL, PDIP24 | 51 |
|
$6.5000 / $15.0000 | Buy Now | ||
| Quest Components | BINARY COUNTER, LS SERIES, SYNCHRONOUS, POSITIVE EDGE TRIGGERED, 10-BIT, BIDIRECTIONAL, TTL, PDIP24 | 24 |
|
$10.0000 / $15.0000 | Buy Now |
CAD Models for DM74LS491N by National Semiconductor Corporation
Part Data Attributes for DM74LS491N by National Semiconductor Corporation
|
|
|
|---|---|
|
Rohs Code
|
No
|
|
Part Life Cycle Code
|
Obsolete
|
|
Ihs Manufacturer
|
NATIONAL SEMICONDUCTOR CORP
|
|
Package Description
|
DIP, DIP24,.3
|
|
Reach Compliance Code
|
unknown
|
|
HTS Code
|
8542.39.00.01
|
|
Additional Feature
|
6 MIDDLE BITS CAN BE SET H/L AS A GROUP
|
|
Count Direction
|
BIDIRECTIONAL
|
|
Family
|
LS
|
|
JESD-30 Code
|
R-PDIP-T24
|
|
JESD-609 Code
|
e0
|
|
Length
|
31.915 mm
|
|
Load Capacitance (CL)
|
50 pF
|
|
Load/Preset Input
|
YES
|
|
Logic IC Type
|
BINARY COUNTER
|
|
Max Frequency@Nom-Sup
|
12500000 Hz
|
|
Max I(ol)
|
0.024 A
|
|
Mode of Operation
|
SYNCHRONOUS
|
|
Number of Bits
|
10
|
|
Number of Functions
|
1
|
|
Number of Terminals
|
24
|
|
Operating Temperature-Max
|
75 °C
|
|
Operating Temperature-Min
|
|
|
Output Characteristics
|
3-STATE
|
|
Package Body Material
|
PLASTIC/EPOXY
|
|
Package Code
|
DIP
|
|
Package Equivalence Code
|
DIP24,.3
|
|
Package Shape
|
RECTANGULAR
|
|
Package Style
|
IN-LINE
|
|
Power Supply Current-Max (ICC)
|
180 mA
|
|
Propagation Delay (tpd)
|
30 ns
|
|
Qualification Status
|
Not Qualified
|
|
Seated Height-Max
|
5.08 mm
|
|
Supply Voltage-Max (Vsup)
|
5.25 V
|
|
Supply Voltage-Min (Vsup)
|
4.75 V
|
|
Supply Voltage-Nom (Vsup)
|
5 V
|
|
Surface Mount
|
NO
|
|
Technology
|
TTL
|
|
Temperature Grade
|
COMMERCIAL EXTENDED
|
|
Terminal Finish
|
TIN LEAD
|
|
Terminal Form
|
THROUGH-HOLE
|
|
Terminal Pitch
|
2.54 mm
|
|
Terminal Position
|
DUAL
|
|
Trigger Type
|
POSITIVE EDGE
|
|
Width
|
7.62 mm
|
|
fmax-Min
|
12.5 MHz
|
Alternate Parts for DM74LS491N
This table gives cross-reference parts and alternative options found for DM74LS491N. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of DM74LS491N, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.
| Part Number | Description | Manufacturer | Compare |
|---|---|---|---|
| DM54LS491J | LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, CDIP24, SKINNY, CERAMIC, DIP-24 | Texas Instruments | DM74LS491N vs DM54LS491J |
| DM54LS491J | IC LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, CDIP24, SKINNY, CERAMIC, DIP-24, Counter | National Semiconductor Corporation | DM74LS491N vs DM54LS491J |
| DM74LS491J | LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, CDIP24, SKINNY, CERAMIC, DIP-24 | Texas Instruments | DM74LS491N vs DM74LS491J |
| DM74LS491AN | LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, PDIP24, SKINNY, PLASTIC, DIP-24 | Texas Instruments | DM74LS491N vs DM74LS491AN |
| DM54LS491J/883 | LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, CDIP24, SKINNY, CERAMIC, DIP-24 | Texas Instruments | DM74LS491N vs DM54LS491J/883 |
| DM74LS491AN | IC LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, PDIP24, SKINNY, PLASTIC, DIP-24, Counter | National Semiconductor Corporation | DM74LS491N vs DM74LS491AN |
| DM74LS491N | LS SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT BIDIRECTIONAL BINARY COUNTER, PDIP24, SKINNY, PLASTIC, DIP-24 | Texas Instruments | DM74LS491N vs DM74LS491N |