8-Bit Serial In/Parallel Out Shift Register IC - 74HC164
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The 74HC Series 74HC164 IC utilizes advanced silicon-gate CMOS technology. It has high noise immunity and low consumption of standard CMOS integrated circuits. It also offers speeds comparable to low-power Schottky devices. This 8-bit shift register has gated serial inputs and CLEAR.
Each register bit is a D-type master/slave flip-flop. Inputs A & B permit complete control over the incoming data. A LOW at either or both inputs inhibits the entry of new data and resets the first flip-flop to the low level at the next clock pulse. A high level of one input enables the other input which will then determine the state of the first flip-flop.
Data at the serial inputs may be changed while the clock is HIGH or LOW, but only information meeting the setup and hold time requirements will be entered. Data is serially shifted in and out of the 8-bit register during the positive-going transition of the clock pulse. Clear is independent of the clock and accomplished by a low level at the CLEAR input. The 74HC logic family is functionally as well as pin-out compatible with the standard 74LS logic family. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and the ground.
|
Pin no. |
Pin name |
The main function |
|
1 |
A |
Gated Serial Input 1 |
|
2 |
B |
Gated Serial Input 2 |
|
3,4,5,6,10,11,12,13 |
Parallel Output (A-H) |
Parallel Output Pins |
|
9 |
CLR |
Clear 1 Active-Low |
|
7 |
GND |
Ground Pin |
|
8 |
CLK |
Clock |
|
14 |
VCC |
Power Input Pin |
| Supply Voltage (VCC) | 2-6V |
| DC Input or Output Voltage (VIN, VOUT) | 0 Vcc |
| Operating Temperature Range (TA) ?4 | -40 to 85°C |
| Input Rise or Fall Times VCC = 2.0V | 1000 ns |
| Input Rise or Fall Times VCC = 4.5V | 500 ns |
| Input Rise or Fall Times VCC = 6.0V | 400 ns |
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