2 ACTIVE-LOW AND 1 ACTIVE-HIGH ENABLE INPUT, SCHOTTKY-CLAMPED FOR HIGH PERFORMANCE
Family:
AS
Input Conditioning:
STANDARD
JESD-30 Code:
R-PDSO-G16
JESD-609 Code:
e4
Length:
9.9 mm
Load Capacitance (CL):
50 pF
Logic IC Type:
3-LINE TO 8-LINE DECODER
Max I(ol):
0.048 A
Moisture Sensitivity Level:
1
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:
SOP
Package Equivalence Code:
SOP16,.25
Package Shape:
RECTANGULAR
Package Style:
SMALL OUTLINE
Packing Method:
TUBE
Peak Reflow Temperature (Cel):
260
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:
1.75 mm
Supply Voltage-Max (Vsup):
5.5 V
Supply Voltage-Min (Vsup):
4.5 V
Supply Voltage-Nom (Vsup):
5 V
Surface Mount:
YES
Technology:
TTL
Temperature Grade:
COMMERCIAL
Terminal Finish:
Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form:
GULL WING
Terminal Pitch:
1.27 mm
Terminal Position:
DUAL
Time@Peak Reflow Temperature-Max (s):
30
Width:
3.9 mm
SN74AS138D Frequently Asked Questions (FAQs)
The maximum frequency of operation for the SN74AS138D 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 SN74AS138D 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 SN74AS138D 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 SN74AS138D can operate with a 3.3V power supply, but it's recommended to use a 5V power supply for optimal performance. If using a 3.3V power supply, ensure that the input signals are compatible with the device's input voltage levels and that the output voltage levels meet the requirements of the downstream devices.
When not in use, the enable inputs (G1, G2A, and G2B) should be tied to VCC through a pull-up resistor to prevent floating inputs and ensure proper operation. This is especially important when the device is in a high-impedance state.
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SN74AS138D 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.