SCAS295T January 1993 – July 2014 SN54LVC373A , SN74LVC373A
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Simplified Schematic
- 5 Revision History
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 Handling Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics
- 7.6 Timing Requirements, SN54LVC373A
- 7.7 Timing Requirements, SN74LVC373A
- 7.8 Switching Characteristics, SN54LVC373A
- 7.9 Switching Characteristics, SN74LVC373A
- 7.10 Operating Characteristics
- 7.11 Typical Characteristics
- 8 Parameter Measurement Information
- 9 Detailed Description
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
封裝選項
請參考 PDF 數據表獲取器件具體的封裝圖。
機械數據 (封裝 | 引腳)
- DGV|20
- DB|20
- NS|20
- N|20
- DW|20
- PW|20
- RGY|20
散熱焊盤機械數據 (封裝 | 引腳)
- RGY|20
訂購信息
9 Detailed Description
9.1 Overview
While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components.
OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment.
9.2 Functional Block Diagram
9.3 Feature Description
- Wide operating voltage range
- Operates from 1.65 V to 3.6 V
- Allows down voltage translation
- Inputs accept voltages to 5.5 V
- Ioff feature
- Allows voltages on the inputs and outputs when VCC is 0 V
9.4 Device Functional Modes
Table 2. Function Table (Each Latch)
| INPUTS | OUTPUT Q |
||
|---|---|---|---|
| OE | LE | D | |
| L | H | H | H |
| L | H | L | L |
| L | L | X | Q0 |
| H | X | X | Z |