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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 VCC = 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
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74LVC646AD | 74LVC646AD | 9352 506 00112 | Volume production | SOT137-1
(SO24) | Tube | Standard Marking | 74LVC646AD
| week 13, 2005 |
| 74LVC646AD | 74LVC646AD-T | 9352 506 00118 | Volume production | SOT137-1
(SO24) | Reel Pack, SMD, 13" | Standard Marking | 74LVC646AD
| week 13, 2005 |
| 74LVC646ADB | 74LVC646ADB | 9352 505 80112 | Volume production | SOT340-1
(SSOP24) | Tube | Standard Marking | 74LVC646ADB
| week 12, 2005 |
| 74LVC646ADB | 74LVC646ADB-T | 9352 505 80118 | Volume production | SOT340-1
(SSOP24) | Reel Pack, SMD, 13" | Standard Marking | 74LVC646ADB
| week 12, 2005 |
| 74LVC646APW | 74LVC646APW | 9352 505 90112 | Volume production | SOT355-1
(TSSOP24) | Tube | Standard Marking | 74LVC646APW
| week 10, 2005 |
| 74LVC646APW | 74LVC646APW-T | 9352 505 90118 | Volume production | SOT355-1
(TSSOP24) | Reel Pack, SMD, 13" | Standard Marking | 74LVC646APW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74LVC646AD | 9352 506 00112 | 0.9100 | not available | |||||
| 74LVC646AD | 9352 506 00118 | 0.9100 | Order samples | |||||
| 74LVC646ADB | 9352 505 80112 | 0.9100 | not available | |||||
| 74LVC646ADB | 9352 505 80118 | 0.9100 | Order samples | |||||
| 74LVC646APW | 9352 505 90112 | 0.9100 | not available | |||||
| 74LVC646APW | 9352 505 90118 | 0.9100 | Order samples |
Technical documents
Application Notes
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74LVC646AD | SOT137-1
(SO24) | 3.3V Transceiver/Register (3-State) | 250 | 3.9@3.3V | 1.2-3.6 | Low Power or Battery Applications | TTL | +/- 24 mA |
| 74LVC646ADB | SOT340-1
(SSOP24) | 3.3V Transceiver/Register (3-State) | 250 | 3.9@3.3V | 1.2-3.6 | Low Power or Battery Applications | TTL | +/- 24 mA |
| 74LVC646APW | SOT355-1
(TSSOP24) | 3.3V Transceiver/Register (3-State) | 250 | 3.9@3.3V | 1.2-3.6 | Low Power or Battery Applications | TTL | +/- 24 mA |
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.
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