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74HC4094D

8-bit shift-and-store register, 3-state outputs, cascade capable, SOIC-16

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Manufacturer Part：

74HC4094D

Package：

SOIC-16 (9.9 x 3.9 x 1.5 mm)

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Description

Product Overview

The 74HC4094D from NXP is an 8-stage serial-in/serial or parallel-out shift-and-store bus register with 3-state outputs. It operates from 2V to 6V with separate shift and storage register clocks in a 16-pin SOIC package.

Key Specifications

Function 8-Stage Shift-and-Store Bus Register
Bits 8
Supply Voltage 2V to 6V (HC)
Output Type 3-State
Propagation Delay 19ns at 5V (typ)
Max Clock Frequency 86MHz at 5V
Output Drive +/-4mA at 5V
Operating Temperature -40 to 125 C

Features

  • 8-bit serial-in, serial or parallel-out shift register
  • Separate shift register and storage register clocks
  • Two serial outputs (QS1, QS2) for cascading
  • 3-state parallel outputs for bus sharing
  • Strobe input transfers shift data to storage register
  • Output enable control (OE) for 3-state operation
  • Input clamp diodes for overvoltage protection

Applications

  • Serial-to-parallel data conversion
  • LED display driving with cascaded registers
  • Remote control holding registers
  • GPIO expansion via serial interface
  • Display multiplexing

The 74HC4094D from NXP (formerly Nexperia) is an 8-stage serial-in/serial or parallel-out shift register with a storage register and 3-state outputs. It features separate clocks for the shift and storage registers, providing flexible data management. The device has a serial data input (D) and two serial outputs (QS1 and QS2) that enable daisy-chain cascading of multiple devices. QS1 outputs data on the rising clock edge for fast cascading, while QS2 outputs on the falling edge for slow-edge compatibility. Data is shifted through the register on LOW-to-HIGH transitions of the clock (CP) input, and transferred to the storage register when the strobe (STR) input is HIGH. The 3-state parallel outputs are controlled by the output enable (OE) pin, allowing connection to shared bus lines. Operating from 2V to 6V with CMOS input levels, the 74HC4094D is specified for -40 to 125 C in a 16-pin SOIC package.

The 74HC4094D operates as a serial-to-parallel converter with intermediate storage. Key subsystems include: (1) 8-Stage Shift Register – on each rising edge of CP, data at the D input is shifted into the first stage, and existing data shifts one position toward the last stage; (2) Storage Register – when STR is HIGH, the contents of the shift register are transferred to the storage register; this allows the shift register to be loaded while the storage register holds the previous data on the outputs; (3) 3-State Output Buffers – when OE is HIGH, the storage register data appears on QP0-QP7; when OE is LOW, all outputs are in high-impedance state; (4) Cascading Outputs – QS1 provides data from the last shift register stage on the rising CP edge for fast-edge cascading; QS2 provides the same data on the falling CP edge for slow-edge cascading; (5) Input Clamp Diodes – protect inputs from voltage excursions beyond the supply rails.

Pin Name Type Function
1 STR Input Strobe (transfer shift to storage)
2 D Input Serial data input
3 CP Input Clock input (rising edge shifts)
4-7 QP0-QP3 Output Parallel outputs 0-3 (3-state)
8 VSS Power Ground
9-10 QS1/QS2 Output Serial cascade outputs
11-14 QP7-QP4 Output Parallel outputs 7-4 (3-state)
15 OE Input Output enable (active high)
16 VDD Power Supply voltage (2V to 6V)
  • Serial-to-parallel conversion: expanding MCU GPIO via 3-wire serial interface
  • LED display driving: cascading multiple 74HC4094D for large LED matrices
  • Remote control holding registers: maintaining output states in remote control applications
  • Display multiplexing: driving 7-segment or LED bar displays with minimal MCU pins
  • Industrial control: output expansion for PLC and relay driver applications
Manufacturer Part Number Package Notes
TI CD74HC4094EE4 SOIC-16 Pin-compatible, TI version
Nexperia 74HCT4094D SOIC-16 TTL input levels version
TI SN74HC595DWR SOIC-16 Similar 8-bit shift register
onsemi MC74HC4094ADWR2G SOIC-16 Pin-compatible alternative
Nexperia 74HC4094DB SSOP-16 Smaller body width package
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