SN74AS153NSR

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SN74AS153NSR application field and working principle

The SN74AS153NSR is a dual 4-line-to-1-line data selector/multiplexer logic device from Texas Instruments that is typically used in logic-signal switching applications. The SN74AS153NSR device finds its most common applications in data and address multiplexing, data routing, data security, and programmable logic controllers (PLC). It is available in the 14-PDIP (plastic dual-in-line package) and SOIC (small-outline integrated circuit) versions.

Features of the SN74AS153NSR

• Receives four binary inputs and provides an output.
• Guaranteed power-up and power-down switching.
• Guaranteed output with POWER OFF.
• Output is buffered.
• Available in 14-PDIP (plastic dual-in-line package) and SOIC (small-outline integrated circuit) versions.
• Power supply voltage: VDD = 3.3 V.
• Operating temperature range: 0°C to +70°C.
• Maximum propagation delay time: 35 ns.
• Slew rate: 0.9 V/ns.
• Output drive: 32 mA.
• Latch-up protection: greater than 250 mA.

Working Principle of the SN74AS153NSR

The SN74AS153NSR is a dual 4-line-to-1-line data selector/multiplexer logic device. It includes two independent 4-channel multiplexers that can independently select one data word of four bits each from two sources. The SN74AS153NSR devices have select inputs (S0, S1), enable inputs (E), four data inputs (D0-D3) for each multiplexer and four complementary outputs (Q0-Q3) for each multiplexer. Data at the inputs (D0-D3) are enabled when the select inputs (S0, S1) are both, and the enable input (E) is taken Low (E = 0). The Q0, Q1, Q2, and Q3 outputs provide four complementary outputs of the selected data and will remain at the previous state when both the S0, S1 inputs are taken High.

The SN74AS153NSR device is designed to provide Full Power Off switching. The OUT1, OUT2 outputs will remain OFF when the E input is taken High (E=1) and the S0, S1 inputs are in any combination. The package for the SN74AS153NSR device includes a filament that burns when excessive current flows through the output and guarantees compliance with UL Class F order code.

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