2 ACTIVE-LOW AND 1 ACTIVE-HIGH ENABLE INPUT, SCHOTTKY-CLAMPED FOR HIGH PERFORMANCE
Family:
AS
Input Conditioning:
STANDARD
JESD-30 Code:
R-PDIP-T16
JESD-609 Code:
e4
Length:
19.305 mm
Load Capacitance (CL):
50 pF
Logic IC Type:
3-LINE TO 8-LINE DECODER
Max I(ol):
0.048 A
Number of Bits:
8
Number of Functions:
1
Number of Terminals:
16
Operating Temperature-Max:
70 °C
Output Characteristics:
OPEN-COLLECTOR
Output Polarity:
INVERTED
Package Body Material:
PLASTIC/EPOXY
Package Code:
DIP
Package Equivalence Code:
DIP16,.3
Package Shape:
RECTANGULAR
Package Style:
IN-LINE
Packing Method:
TUBE
Power Supply Current-Max (ICC):
20 mA
Prop. Delay@Nom-Sup:
22 ns
Propagation Delay (tpd):
10 ns
Qualification Status:
Not Qualified
Seated Height-Max:
5.08 mm
Supply Voltage-Max (Vsup):
5.5 V
Supply Voltage-Min (Vsup):
4.5 V
Supply Voltage-Nom (Vsup):
5 V
Surface Mount:
NO
Technology:
TTL
Temperature Grade:
COMMERCIAL
Terminal Finish:
Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form:
THROUGH-HOLE
Terminal Pitch:
2.54 mm
Terminal Position:
DUAL
Width:
7.62 mm
SN74AS138N Frequently Asked Questions (FAQs)
The maximum frequency of operation for the SN74AS138N is typically around 100 MHz, but it can vary depending on the specific application and operating conditions. It's recommended to consult the datasheet and perform simulations to determine the maximum frequency for a specific design.
Proper termination for the SN74AS138N involves connecting a pull-up resistor to VCC on the enable inputs (G1, G2A, and G2B) and using a series resistor on the output lines to prevent ringing and overshoot. The value of the pull-up resistor depends on the specific application, but a typical value is around 1 kΩ to 4.7 kΩ.
The SN74AS138N can sink or source up to 24 mA of current per output pin, but it's recommended to limit the current to 16 mA or less to ensure reliable operation and prevent overheating.
Yes, the SN74AS138N can be used in a 3.3V system, but it's recommended to use a voltage regulator or level translator to ensure that the input signals are within the recommended operating range of 4.5V to 5.5V. Additionally, the output voltage may not be fully compatible with 3.3V logic, so additional circuitry may be required to ensure proper operation.
When the enable inputs (G1, G2A, and G2B) are not used, they should be tied to VCC or GND to prevent floating inputs and ensure proper operation. It's recommended to use a pull-up or pull-down resistor to tie the unused inputs to the desired logic level.
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SN74AS138N Overview
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
