Diodes Incorporated 74HCT164S14-13

Overview

74HCT164S14-13 from Diodes Incorporated is an 8-bit serial-in/parallel-out shift register with asynchronous master reset, TTL-compatible CMOS logic, Schmitt-trigger inputs, and SO-14 package. It operates at 4.5–5.5 V, delivers 4 mA output drive, and supports up to 55 MHz clock frequency at 4.5 V for data serialization in microcontroller peripheral expansion.

For engineers reviewing the 74HCT164S14-13 datasheet, 74HCT164S14-13 pinout, 74HCT164S14-13 application, or 74HCT164S14-13 equivalent, this device serves as a low-power, edge-triggered serial-to-parallel interface for LED drivers, address latching, and I/O port expansion where deterministic timing and noise-immune input thresholds are required.

Technical Context

The 74HCT164S14-13 implements an 8-stage D-type flip-flop chain with positive-edge clock (CP) triggering and asynchronous active-low master reset (MR). Serial data enters via logically ANDed inputs DSA and DSB, enabling flexible enable/data gating without external logic.

Each stage propagates data on the rising edge of CP, with Q0–Q7 outputs available simultaneously. Input Schmitt triggers provide 1.2 V typical hysteresis, ensuring robust noise immunity for slow or noisy serial streams, while output VOH/VOL specifications guarantee TTL-level compatibility across temperature ranges.

Key Specifications

Pinout & Package

74HCT164S14-13 is housed in a 14-pin SOIC (SO-14) surface-mount package with 1.27 mm pitch, 8.6 mm × 3.9 mm body, and standard JEDEC MO-002AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with SN74HCT164N and 74HC164PW,118, the 74HCT164S14-13 uniquely combines SO-14 packaging, Schmitt-trigger noise immunity, and industrial-grade ESD protection - making it optimal for compact, noise-prone 5 V embedded systems requiring reliable serial-to-parallel conversion.

Availability

74HCT164S14-13 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller I/O expansion, and address latching applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for 74HCT164S14-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer electronics.

The 74HCT164S14-13 belongs to Diodes' HCT logic family - designed specifically for TTL-compatible 5 V systems requiring low power, noise immunity, and drop-in replacement capability for legacy 74LS devices.

FAQ

Can 74HCT164S14-13 operate at 3.3 V?

No. The 74HCT164S14-13 is specified only for 4.5–5.5 V operation per its Recommended Operating Conditions. At 3.3 V, VIH minimum (2.0 V) exceeds 70% of VCC, violating HCT input threshold design - resulting in unreliable logic recognition and potential metastability. Use 74HC164 or 74LVC164 for true 3.3 V operation.

What happens if both DSA and DSB are driven LOW simultaneously?

When both DSA and DSB are LOW, the internal AND gate forces the serial input to LOW, causing Q0 to load '0' on the next CP rising edge. This behavior is fully defined in the Function Table and enables predictable zero-fill or forced-clear operation without external logic.

Is the master reset (MR) pin debounced internally?

No. MR is a purely asynchronous, unbuffered input with no internal filtering or debouncing. External RC filtering or firmware-controlled synchronization is required if MR is driven by mechanical switches or noisy control signals to prevent unintended resets during contact bounce.

How does the Schmitt-trigger input affect serial data timing margins?

The Schmitt-trigger input increases effective setup/hold time by rejecting sub-threshold noise transients, but does not alter the specified tSU (12 ns) or tH (4 ns) values. Those parameters remain referenced to the 1.3 V switching threshold (VM) - the hysteresis simply ensures the input crosses VM cleanly even with slow or noisy edges.