SN74HC138N Electronic IC Chips 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SN54HC138, SN74HC138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

• Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems

• Wide Operating Voltage Range of 2 V to 6 V

• Outputs Can Drive Up To 10 LSTTL Loads

• Low Power Consumption, 80-μA Max ICC

• Typical tpd = 15 ns

• ±4-mA Output Drive at 5 V

• Low Input Current of 1 μA Max

• Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception descri

description

The ’HC138 devices are designed to be used in high-performance memory-decoding or datarouting applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

The conditions at the binary-select inputs at the three enable inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage range, V_CC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V

Input clamp current, I_IK (V_I < 0 or V_I > V_CC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA

Output clamp current, I_OK (V_O < 0 or V_O > V_CC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . ±20 mA

Continuous output current, I_O (V_O = 0 to V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 mA

Continuous current through V_CC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA

Package thermal impedance, θ_JA (see Note 2): D package  . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W

                                                                           DB package  . . . . . . . . . . . . . . . . . . . . . . . . 82°C/W

                                                                           N package  . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W

                                                                           NS package  . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W

                                                                           PW package  . . . . . . . . . . . . . . . . . . . . . . . 108°C/W

Storage temperature range, Tstg  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

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