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CD4094BE

8-bit SIPO shift register with output latch, 3-state, CMOS 3-18V, PDIP-16

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Pieza del fabricante：

CD4094BE

Paquete：

PDIP-16 (19.3 x 9.4 x 4.57mm, 2.54mm pitch, through-hole)

Marca：

Categorías de productos：

Circuitos integrados IC, Circuitos integrados de interfaz

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Descripción

Productos

The CD4094BE from Texas Instruments is an 8-bit serial-in parallel-out shift register with 3-state output latch and cascade outputs — the CMOS equivalent of the 74HC595 for 3V-18V systems in a 16-pin PDIP package.

Especificaciones

Función	8-bit serial-in parallel-out shift register with output latch
Technology	CD4000B CMOS
Tensión de alimentación	3V to 18V
Serial Input	DATA (single input)
Outputs	Q1-Q8 (latched parallel outputs, 3-state)
Cascade Outputs	QS (sync), QS’ (async) for cascading
Output Enable	OE (active HIGH enables outputs)
Strobe	STROBE (active HIGH, transfers shift register to output latch)
Max Clock Frequency	6MHz @ VDD=10V
Temperatura de funcionamiento	-55°C to +125°C
Paquete	PDIP-16 (19.3 x 9.4mm)

Características

8-bit shift register with separate output latch
3-state outputs (can be bus-connected)
Two cascade outputs: QS (synchronous) and QS’ (asynchronous)
Output enable for bus applications
Flicker-free display driving (latch holds output during shift)
3V-18V wide supply range

Aplicaciones

Flicker-free LED display driving
GPIO expansion (2 MCU pins → 8 outputs)
Bus-oriented output ports
Multi-digit display multiplexing

Introducción del producto:CD4094BE Presentación del producto

The CD4094BE from Texas Instruments is an 8-bit serial-in parallel-out shift register with a separate output latch and 3-state outputs — essentially the CMOS version of the 74HC595. The key advantage over the simpler CD4014/74164 is the output latch: the shift register and output latch are separate, so data can be shifted in without disturbing the current output display. Only when STROBE goes HIGH is the shift register data transferred to the output latch, updating the outputs simultaneously. This eliminates the flicker that occurs with the 74164 where outputs change as data shifts through. The 3-state outputs (controlled by OE) allow multiple CD4094s to share a common output bus. The two cascade outputs (QS synchronous with clock, QS’ asynchronous) allow daisy-chaining: QS or QS’ connects to the DATA input of the next CD4094, creating 16, 24, or more outputs from just 3 MCU pins (DATA, CLK, STROBE). The wide 3V-18V supply range makes the CD4094 suitable for battery and multi-voltage systems. The BE suffix denotes the PDIP-16 package.

Principio de funcionamiento:CD4094BE Principio de funcionamiento

The CD4094BE has two separate registers: an 8-bit shift register and an 8-bit output latch. On each rising CLK edge, the DATA input is shifted into the first stage of the shift register, and all other stages shift one position toward Q8. The QS output provides the data being shifted out (after Q8) for cascading — QS changes on the rising clock edge (synchronous), while QS’ changes on the falling clock edge (asynchronous, one-half clock cycle early). The output latch holds the current display data independently of the shift register. When STROBE goes HIGH, the shift register contents are copied to the output latch, updating Q1-Q8 simultaneously. When STROBE is LOW, the output latch holds its previous value regardless of shift register changes. The OE (output enable) controls the 3-state outputs: when OE=HIGH, Q1-Q8 drive the bus; when OE=LOW, Q1-Q8 go to high-impedance (tri-state). To write 8 bits: (1) Shift in 8 bits of data on DATA while clocking 8 times (STROBE=LOW, OE=HIGH); (2) Pulse STROBE HIGH to transfer data to output latch; (3) Outputs update instantly and simultaneously. To cascade: QS or QS’ → DATA of next CD4094; shared CLK and STROBE; one 8-bit transfer updates all chips.

Descripción de la clavija:CD4094BE Definición y funciones de las clavijas

Pin	Nombre	Tipo	Descripción
1	QS’	Salida	Cascade output (asynchronous, rising on falling CLK)
2	QS	Salida	Cascade output (synchronous, changes on rising CLK)
3	Q8	Salida	Parallel output bit 8 (MSB, 3-state)
4	Q7	Salida	Parallel output bit 7 (3-state)
5	Q6	Salida	Parallel output bit 6 (3-state)
6	Q5	Salida	Parallel output bit 5 (3-state)
7	Q4	Salida	Parallel output bit 4 (3-state)
8	VSS	Potencia	Suelo
9	Q3	Salida	Parallel output bit 3 (3-state)
10	Q2	Salida	Parallel output bit 2 (3-state)
11	Q1	Salida	Parallel output bit 1 (LSB, 3-state)
12	OE	Entrada	Output enable (HIGH = outputs active, LOW = high-Z)
13	STROBE	Entrada	Latch strobe (HIGH = transfer shift register to output latch)
14	DATA	Entrada	Entrada de datos serie
15	CLK	Entrada	Clock (positive edge)
16	VDD	Potencia	Supply (3V to 18V)

Application Scenarios:In which products and applications isCD4094BE usado

8-LED Display (Flicker-Free): MCU: DATA, CLK, STROBE; shift 8 bits (STROBE=LOW); pulse STROBE HIGH; all 8 LEDs update simultaneously; no flicker
24-Output Expansion: Three CD4094s; QS → DATA of next; shared CLK, STROBE, OE; shift 24 bits; pulse STROBE; 24 outputs from 3 MCU pins
Bus Output Port: OE controlled by address decoder; CD4094 outputs on shared bus; only one CD4094 drives bus at a time (3-state)
Multi-Digit 7-Segment: 3 CD4094s for 3 digits; shift segment data; STROBE updates all digits simultaneously; no ghosting

Alternative Models:What chips are recommended as replacements for CD4094BE

Modelo	Fabricante	Diferencia clave	Paquete	Supply
CD4094BM	TI	SOIC-16 surface-mount version with identical logic function and 3-18V range	SOIC-16	3-18V
CD4094BE	TI	Through-hole DIP version for prototyping and legacy board repair	DIP-16	3-18V
HEF4094BT	NXP	Pin-compatible CMOS version with improved ESD protection and 3-15V supply	SOIC-16	3-15V
MC144094BDR2G	onsemi	Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option	SOIC-16	3-18V
74HC595D	TI/Nexperia	HC CMOS version with higher speed and 2-6V supply for modern logic systems	SOIC-16	2-6V
74HC595N	TI/Nexperia	HC CMOS through-hole version for prototyping with 2-6V supply range	DIP-16	2-6V
74HCT595D	Nexperia	HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems	SOIC-16	4.5-5.5V

CD4094 is the CMOS 4000-series 8-stage serial shift register with output latches operating over the wide 3-18V supply range. The HEF4094 (NXP) and MC144094 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC595 HC/HCT families offer significantly faster propagation delay and lower power consumption at 2-6V. Surface-mount versions use the BM/M suffix (SOIC); through-hole versions use the BE suffix (DIP).