規格
| 屬性 | 價值 |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | 74LS |
| Part Status | Active |
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High Low | 15mA, 24mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount |
概述
Description
SN74LS541DWR is an octal (8-bit) D-type transparent latch with 3-state outputs from TI’s 74LS TTL family.
Key points
- D inputs: D0–D7; Q outputs: Q0–Q7.
- Control: LE (Latch Enable) and G (Output Enable).
- Operation: When LE is HIGH, Q mirrors D (transparent latch). When LE goes LOW, Q holds the last latched value. When G enables, the outputs go to a high-impedance state (tri-state) for bus sharing.
- Power and package: typically 5 V (4.5–5.5 V), 20-pin package (DWR variant denotes TI’s packaging/board form).
- Timing: Latch propagation delays are in the tens of nanoseconds range (datasheet gives exact figures).
- Typical uses: data buffering, bus interfacing, temporary storage, and address/data latching in microprocessor systems.
Note: For exact pinout, timing, and electrical specs, consult the SN74LS541DWR datasheet.
Key points
- D inputs: D0–D7; Q outputs: Q0–Q7.
- Control: LE (Latch Enable) and G (Output Enable).
- Operation: When LE is HIGH, Q mirrors D (transparent latch). When LE goes LOW, Q holds the last latched value. When G enables, the outputs go to a high-impedance state (tri-state) for bus sharing.
- Power and package: typically 5 V (4.5–5.5 V), 20-pin package (DWR variant denotes TI’s packaging/board form).
- Timing: Latch propagation delays are in the tens of nanoseconds range (datasheet gives exact figures).
- Typical uses: data buffering, bus interfacing, temporary storage, and address/data latching in microprocessor systems.
Note: For exact pinout, timing, and electrical specs, consult the SN74LS541DWR datasheet.
Features
Here are the main features of SN74LS541DWR:
- 8-bit D-type transparent latch with tri-state outputs
- Latch Enable (LE): when HIGH, Q follows D; when LOW, Q holds its value
- Output Enable (OE): active-low; enables all 8 outputs; OE HIGH → outputs go to high-impedance
- 5V supply; TTL-compatible inputs (LS family = low-power Schottky)
- Suitable for bus buffering and data/address latching due to 3-state outputs
- Commercial temperature range (typical for standard LS devices)
- Available in standard TI packaging variants (DWR suffix indicates the specific package/handling per TI catalog)
Note: Exact timing specs (propagation delays, setup/hold) are in the datasheet; this summarizes the functional features.
- 8-bit D-type transparent latch with tri-state outputs
- Latch Enable (LE): when HIGH, Q follows D; when LOW, Q holds its value
- Output Enable (OE): active-low; enables all 8 outputs; OE HIGH → outputs go to high-impedance
- 5V supply; TTL-compatible inputs (LS family = low-power Schottky)
- Suitable for bus buffering and data/address latching due to 3-state outputs
- Commercial temperature range (typical for standard LS devices)
- Available in standard TI packaging variants (DWR suffix indicates the specific package/handling per TI catalog)
Note: Exact timing specs (propagation delays, setup/hold) are in the datasheet; this summarizes the functional features.
Pinout
- Pin count: 20 pins (DIP, SN74LS541DWR; also available in other packages).
- Function: Octal buffer/driver with 3-state (tri-state) outputs. It provides eight non-inverting buffers (A0–A7 to Y0–Y7) whose outputs can be placed in high-impedance state via a common enable control.
- Function: Octal buffer/driver with 3-state (tri-state) outputs. It provides eight non-inverting buffers (A0–A7 to Y0–Y7) whose outputs can be placed in high-impedance state via a common enable control.
Manufacturer
- Manufacturer: Texas Instruments (TI)
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and integrated circuits (analog and digital chips), one of the largest semiconductor manufacturers in the world.
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and integrated circuits (analog and digital chips), one of the largest semiconductor manufacturers in the world.
Application
SN74LS541DWR is an 8-bit, non-inverting buffer/driver with tri-state outputs. Typical applications:
- Buffering an 8-bit data or address bus between a microprocessor/microcontroller and memory or peripherals
- Shared-bus interfaces with enable control to prevent contention
- Bus isolation and fan-out expansion to drive multiple inputs
- Signal buffering to reduce loading/noise on critical digital paths
- General-purpose 8-bit line driver in digital systems requiring controllable tri-state outputs.
- Buffering an 8-bit data or address bus between a microprocessor/microcontroller and memory or peripherals
- Shared-bus interfaces with enable control to prevent contention
- Bus isolation and fan-out expansion to drive multiple inputs
- Signal buffering to reduce loading/noise on critical digital paths
- General-purpose 8-bit line driver in digital systems requiring controllable tri-state outputs.
Package
20-pin DIP package (Plastic DIP, 0.300" wide).
