M74HC597B1R

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M74HC597B1R Logic - Shift Registers

The M74HC597B1R is a versatile, high-speed, 8-bit serial-in/parallel-out shift register with a storage register designed for low-voltage (2.7V to 5.5V) and helpful in applications requiring a wide range of connectors. It requires an external shift-register clock (SRCLK) and an additional storage register clock (RCLK). This device is ideally suited for designs that must interface with 3-state buffers, latches, and bus hold circuits.

M74HC597B1R Features

• High-speed operation (typical tpd = 17ns)
• Low-power dissipation (typical ICC = 1µA)
• Shift register has 8-bit serial-in, parallel-out configuration with gated D-type flip-flops
• Data stored in internal storage register on the low-to-high transition of RCLK
• Data shifted out of register on the positive-going transition of SRCLK
• Inputs accept Voltages up to 5.5V
• ESD protection: Human body model > 2000V
• Package Options: SOT-23-6 and SOP-16

M74HC597B1R Application Field

The M74HC597B1R is an application specific version of the M74HC597 and is specially designed to operate at low supply voltages. It offers improved performance with low power consumption.

It is suitable for applications such as keyboards/encoders, clock/data distribution, security systems, switching/spointer/monitoring systems, sensory systems, for AD/DA conversion, and for voltage/signal timing regulation. A general purpose version of the M74HC597 is also available, the M74HC597.

M74HC597B1R Working Principle

The M74HC597B1R consists of an 8-bit storage register with access to the storage register via RCLK and an 8-bit shift register with data transfer into and out of the shift register via the SRCLK. The device also contains two control pins (CE1 and CE2). An active low logic level on either or both of the control pins disables data transfer and/or storage register clock.

Data is written into the storage register on the low-to-high transition of RCLK provided that CE2 is a low logic level. On the high-to-low transition of CE2 the RCLK is ignored and data will not be written into the register. Data is shifted out of the shift register on the positive-going transition of the SRCLK provided that both CE1 and CE2 are low logic levels.

Data from the serial input (DS) is latched on the rising edge of the shift Register Clock (SRCLK) input. On the falling edge of the Storage Register Clock (RCLK) the data in the shift register is transferred to the storage register, and is made available at the outputs (Q0 to Q7). The CE1 and CE2 pins provide two levels of clock gating which further enhance the flexibility of the device.

Summary

The M74HC597B1R is a high-speed, 8-bit serial-in/parallel-out shift register with a storage register designed for low-voltage (2.7V-5.5V). It is suitable for applications such as keyboards/encoders, clock/data distribution, security systems, switching/monitoring systems, sensory systems, for AD/DA conversion, and for voltage/signal timing regulation. Its working principle is based on two control pins (CE1 and CE2) used to disable data transfer or storage register clock, and data is written into the storage register on the low-to-high transition of RCLK. Data is shifted out of the shift register on the positive-going transition of the SRCLK provided that both CE1 and CE2 are low logic levels.

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