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74LVT646
Datasheet
General description
The LVT646 is a high-performance BiCMOS product designed for VCC operation at 3.3V.
This device consists of bus transceiver circuits with 3-State outputs, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or the internal registers.
Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes High.
Output Enable (OE) and DIR pins are provided to control the transceiver function. In the transceiver mode, data present at the high impedance port may be stored in either the A or B register or both.
The Select (SAB, SBA) pins determine whether data is stored or transferred through the device in real–time. The DIR determines which bus will receive data when the OE is active (Low). In the isolation mode (OE = High), data from Bus A may be stored in the B register and/or data from Bus B 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 busesA or B may be driven at a time. The examples on the next page demonstrate the four fundamental bus management functions that can be performed with the 74LVT646.
Features
- Combines 74LVT245 and 74LVT574 type functions in one device
- Independent registers for A and B buses
- Multiplexed real–time and stored data
- Output capability: +64mA/–32mA
- TTL input and output switching levels
- Input and output interface capability to systems at 5V supply
- Bus-hold data inputs eliminate the need for external pull-up resistors to hold unused inputs
- Live insertion/extraction permitted
- No bus current loading when output is tied to 5V bus
- Latch-up protection exceeds 500mA per JEDEC Std 17
- Power-up 3-State
- Power-up reset
- ESD protection exceeds 2000V per MIL STD 883 Method 3015 and 200V per Machine Model
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74LVT646D | 74LVT646D | 9351 672 00112 | Volume production | SOT137-1
(SO24) | Tube | Standard Marking | 74LVT646D
| week 13, 2005 |
| 74LVT646D | 74LVT646D-T | 9351 672 00118 | Volume production | SOT137-1
(SO24) | Reel Pack, SMD, 13" | Standard Marking | 74LVT646D
| week 13, 2005 |
| 74LVT646DB | 74LVT646DB | 9351 672 10112 | Volume production | SOT340-1
(SSOP24) | Tube | Standard Marking | 74LVT646DB
| week 12, 2005 |
| 74LVT646DB | 74LVT646DB-T | 9351 672 10118 | Volume production | SOT340-1
(SSOP24) | Reel Pack, SMD, 13" | Standard Marking | 74LVT646DB
| week 12, 2005 |
| 74LVT646PW | 74LVT646PW | 9351 777 30112 | Volume production | SOT355-1
(TSSOP24) | Tube | Standard Marking | 74LVT646PW
| week 10, 2005 |
| 74LVT646PW | 74LVT646PW-T | 9351 777 30118 | Volume production | SOT355-1
(TSSOP24) | Reel Pack, SMD, 13" | Standard Marking | 74LVT646PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74LVT646D | 9351 672 00112 | 1.5600 | not available | |||||
| 74LVT646D | 9351 672 00118 | 1.5600 | Order samples | |||||
| 74LVT646DB | 9351 672 10112 | 1.5600 | not available | |||||
| 74LVT646DB | 9351 672 10118 | 1.5600 | Order samples | |||||
| 74LVT646PW | 9351 777 30112 | 1.5600 | not available | |||||
| 74LVT646PW | 9351 777 30118 | 1.5600 | Order samples |
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | No. of Pins | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74LVT646D | SOT137-1
(SO24) | 3.3V Transceiver/Register with Bus Hold (3-State) | 180 | 3.8@3.3V | 2.7-3.6 V | 24 | TTL | -32/+64 mA |
| 74LVT646DB | SOT340-1
(SSOP24) | 3.3V Transceiver/Register with Bus Hold (3-State) | 180 | 3.8@3.3V | 2.7-3.6 V | 24 | TTL | -32/+64 mA |
| 74LVT646PW | SOT355-1
(TSSOP24) | 3.3V Transceiver/Register with Bus Hold (3-State) | 180 | 3.8@3.3V | 2.7-3.6 V | 24 | TTL | -32/+64 mA |
Similar products
74LVT646 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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