ON Semiconductor MC74VHC595MEL 8-Bit Shift Register with Output Latches

The MC74VHC595MEL from ON Semiconductor is a high-performance CMOS 8-bit shift register with output latches that integrate serial and parallel interfaces with high drive capability. This device is particularly designed for low-power and high-speed requirements, making it suitable for a wide range of applications, from consumer electronics to sophisticated industrial control systems.

Constructed with silicon gate CMOS technology, the MC74VHC595MEL offers the benefits of high-speed operation similar to LSTTL combined with the low power consumption of standard CMOS integrated circuits. This makes it an ideal choice for interfacing with microprocessors, microcontrollers, and other logic systems where data needs to be shifted or stored.

The device features an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has 8 parallel 3-state outputs, allowing for convenient expansion of the data bus. The shift register and storage register have separate clocks. Data is shifted on the positive-going transitions of the SH_CP (Shift Register Clock Input) and the data in the storage register is transferred to the output buffer on a positive-going transition of the ST_CP (Storage Register Clock Input).

Additional functionalities include a serial output (Q'S) for cascading purposes, which allows multiple MC74VHC595MEL devices to be connected in series. This feature is particularly useful when more than 8 bits of data need to be shifted and latched. The device also has an output enable input (OE) which, when held high, will force all outputs to a high impedance state, thus allowing multiple outputs to be connected together without the risk of current flowing between them.

The MC74VHC595MEL operates over a broad voltage range from 2V to 5.5V and is available in a surface-mount EIAJ SOIC-16 package. Its robust design ensures reliable operation over an extended temperature range, making it a versatile component in designing digital systems where space is at a premium and reliable performance is required.

In summary, the ON Semiconductor MC74VHC595MEL is a versatile and efficient solution for expanding the output capabilities of digital systems, providing designers with a reliable and high-performance component that is suitable for a wide range of applications.