74F646SCX

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74F646SCX is a low-power octal bus transceiver, part of the F family series of logic devices byFairchild Semiconductor. It is a logic device that is designed to transmit digital bus signals between two systems operating at different data rates and voltages. This transceiver serves as both a transmitter and a receiver by providing a layer of digital isolation between the two systems.

The device ismade of a low-voltage-tolerant, fast, open-collector bus transceiver. This transceiver comprises of two 8-bit bidirectional bus transceivers with separate output-enable pins and enables for each of the two transceivers. The output of the transceiver is connected to the ground through a pull-down resistor, allowing for greater impedance and voltage stability.

74F646SCX can be used in many different applications, such as in a shared bus interface, data communication, industrial control, and memory interface. This product has ESD protection on the input and output pins, allowing for low stress in high voltage and transient conditions. It also has a maximum propagation delay of 7.0 ns and a wide operating temperature range of -40°C to 85°C.

The device supports an existing 1.65 to 3.6V voltage range while being able to accept 1.8 to 5.5V input and deliver a 5V output. It is also built with open-drain outputs, allowing for increased noise suppression in noisy environments. It also features dual enable inputs that can be combined, allowing for faster data transmission. The 74F646SCX can easily handle current levels up to 12 mA through a single package.

The 74F646SCX works on the principle of active bus receivers and buffers. It utilizes two 8-bit bus transceivers, one on each side of the receiver-buffer. These two transceivers work independently, without affecting the other one, thus enabling quick and reliable transmission of the digital data. The two transceivers in the device also reduce the total power consumption. Each transceiver consists of a 2-stage CMOS amplifier, a TTL level converter, and a complementary open-collector circuit.

When a logic 1 is applied to the enable (ENABLE A or ENABLE B), the TTL and the CMOS stages of the corresponding bus transceiver will transmit the incoming digital data serially on the output pin. When the enable is deactivated, all their outputs will be in the high impedance state, effectively isolating the output from the input.

The output of the bus transceiver is connected to the ground through a pull-down resistor, allowing for greater output impedance and voltage stability. Additionally, the 74F646SCX features ESD protection on both its input and output pins to protect the device from high voltage and transient conditions.

The 74F646SCX is an octal bus transceiver that is used in many different applications, such as in shared bus interface, communication, industrial control, and memory interface. It supports differential power levels with a wide operating temperature range and is built with open-drain outputs for increased noise suppression in noisy environments. Additionally, it works on the principle of active bus receivers and buffers, utilizing two 8-bit bus transceivers and two enable controls to control its operation.

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