CD4034 8-Stage Bidirectional Bus Register

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The CD4034 is an 8-bit CMOS static shift register with two parallel bidirectional data ports (A and B). The IC belongs to the CD4XXX IC series and is designed by using the complementary MOS (CMOS) technology. The output of the IC always comes in TTL, which makes it easy to interface with MCUs and MPUs. All eight register stages are D-type master-slave flip-flops with separate master and slave clock inputs generated internally to allow synchronous or asynchronous data transfer from master to slave. All inputs are protected against damage due to static discharge by diode clamps to VDD and VSS. CD4034 offers a wide variety of features such as high noise immunity and ESD protection.

What is Bus Register?

Bus registers are digital memory circuitry found in various types of equipment & tools such as calculators, computers, and data processing systems. With a shift register, data or bits are entered into the system in a serial or parallel manner. Data entry is done from one direction, and as more data is added, it shifts positions until the data gets to the output end.

CD4034 Key Features

Wide supply voltage range 3.0V to 18V
High noise immunity 0.45 VDD (typ.)
Low power TTL compatibility Fan out of 2 driving 74L or 1 driving 74LS
RCA CD4034B second source

CD4034 Pinout

Pin No	Pin Name	Description
1	B8	DATALINE 8 OF BUS REGISTER B
2	B7	DATALINE 7 OF BUS REGISTER B
3	B6	DATALINE 6 OF BUS REGISTER B
4	B5	DATALINE 5 OF BUS REGISTER B
5	B4	DATALINE 4 OF BUS REGISTER B
6	B3	DATALINE 3 OF BUS REGISTER B
7	B2	DATALINE 2 OF BUS REGISTER B
8	B1	DATALINE 1 OF BUS REGISTER B
9	“A”-EN	“A” ENABLE INPUT
10	S-INPUT	SERIAL INPUT
11	A/B	A OR B INPUT
12	VSS	source supply
13	P/S	Parallel OR Serial INPUT
14	A/S	Asynchronous OR Synchronous INPUT
15	CLK	CLOCK SIGNAL
16	A1	DATALINE 1 OF BUS REGISTER A
17	A2	DATALINE 2 OF BUS REGISTER A
18	A3	DATALINE 3 OF BUS REGISTER A
19	A4	DATALINE 4 OF BUS REGISTER A
20	A5	DATALINE 5 OF BUS REGISTER A
21	A6	DATALINE 6 OF BUS REGISTER A
22	A7	DATALINE 7 OF BUS REGISTER A
23	A8	DATALINE 8 OF BUS REGISTER A
24	VDD	Drain supply

Application

Parallel Input/Parallel Output
- Parallel Input/Serial Output
- Serial Input/Parallel Output
- Serial Input/Serial Output register
Shift right/shift left register
Shift right/shift left with parallel loading
Address register
Buffer register
Bus system register with enable parallel lines at bus side
Double bus register system
Up-down Johnson or ring counter
Pseudo-random code generators
Sample and hold register (storage, counting, display)
Frequency and phase comparator