74LVC646A

General description

The 74LVC646A is a high-performance, low-power, low-voltage, Si-gate CMOS device and superior to most advanced CMOS compatible TTL families.

Inputs can be driven from either 3.3 V or 5 V devices. In 3-state operation, outputs can handle 5 V. This feature allows the use of these devices as translators in a mixed 3.3 V and 5 V environment.

The 74LVC646A consists of non-inverting bus transceiver circuits with 3-state outputs, D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the internal registers. Data on the A or B bus will be clocked in the internal registers, as the appropriate clock (CPAB or CPBA) goes to a HIGH logic level. Output enable (OE) and direction (DIR) inputs are provided to control the transceiver function. In the transceiver mode, data present at high-impedance port may be stored in either the A or B register, or in both. With the select source inputs (SAB and SBA) stored and real-time (transparent mode) data can be multiplexed. The direction (DIR) input determines which bus will receive data when OE is active (LOW). In the isolation mode (OE = HIGH), A data may be stored in the B register and/or B data may be stored in the A register. When an output function is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two buses A or B may be driven at a time.

Features

• 5 V tolerant inputs/outputs for interfacing with 5 V logic
• Supply voltage range from 1.2 V to 3.6 V
• Complies with JEDEC standard JESD8-B/JESD36
• CMOS low-power consumption
• Direct interface with TTL levels
• 8-bit octal transceiver with D-type latch
• Back-to-back registers for storage
• Separate controls for data flow in each direction
• Supports partial power-down applications; inputs/outputs are high-impedance when V_CC = 0 V
• ESD protection:
• HBM EIA/JESD22-A114-B exceeds 2000 V
• MM EIA/JESD22-A115-A exceeds 200 V.
• Specified from -40 Cel to +85Cel and -40 Cel to +125 Cel.

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Block diagrams/pinning

Design support

Application Notes

AN240; Interfacing 3 Volt and 5 Volt Applications (1995-09-15)

AN263; Power considerations when using CMOS and BiCMOS logic devices (2002-02-05)

Parametrics/similar products

Similar products
74LVC646A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

Print / Email

• Print this information
• Email this information

Disclaimers

• General product disclaimer
• Quality and reliability disclaimer