Overview
The SN74LS373DWR, produced by Texas Instruments, is an octal D-type transparent latch integrated circuit. This component is part of the 74LS series, known for its low power consumption and high noise immunity. The SN74LS373DWR features 3-state outputs, making it suitable for driving highly capacitive or low-impedance loads in bus-organized systems. It is particularly useful for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (DW) | - |
| Pins | 20 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (VCC) | 5 V | V |
| Input Voltage (VI) | 5.5 V | V |
| Low-Level Output Current (IOL) | 12 mA | mA |
| Data Setup Time (tsu) | 5 ns | ns |
| Data Hold Time (th) | 20 ns | ns |
| Maximum Clock Frequency (fmax) | 35 MHz | MHz |
| Propagation Delay Time (tPLH, tPHL) | 12-18 ns | ns |
| Storage Temperature Range (Tstg) | -65 to 150 °C | °C |
Key Features
- Choice of eight latches or eight D-type flip-flops in a single package
- 3-State bus-driving outputs, allowing direct connection to and driving of bus lines without need for interface or pullup components
- Full parallel access for loading
- Buffered control inputs
- Clock-enable input with hysteresis to improve noise rejection
- P-N-P inputs reduce DC loading on data lines
- Transparent D-type latches: outputs follow data inputs when enable (C or CLK) is high, and latch at the level of the data when enable is low
- Buffered output-control (OC) input to place outputs in normal logic state or high-impedance state
Applications
The SN74LS373DWR is particularly attractive for various applications, including:
- Implementing buffer registers
- I/O ports
- Bidirectional bus drivers
- Working registers
Its 3-state outputs and high noise immunity make it suitable for use in bus-organized systems, where it can drive highly capacitive or low-impedance loads directly.
Q & A
- What is the primary function of the SN74LS373DWR?
The SN74LS373DWR functions as an octal D-type transparent latch or edge-triggered flip-flop, depending on the configuration.
- What is the operating temperature range of the SN74LS373DWR?
The operating temperature range is from 0 to 70°C.
- What is the maximum supply voltage for the SN74LS373DWR?
The maximum supply voltage (VCC) is 5.5 V.
- What is the significance of the 3-state outputs in the SN74LS373DWR?
The 3-state outputs allow the device to drive bus lines directly without the need for interface or pullup components and can be set to a high-impedance state to neither load nor drive the bus lines.
- How does the clock-enable input with hysteresis improve the device's performance?
The clock-enable input with hysteresis improves noise rejection by typically 400 mV, enhancing the device's reliability in noisy environments.
- What types of applications is the SN74LS373DWR suitable for?
The SN74LS373DWR is suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the maximum clock frequency for the SN74LS373DWR?
The maximum clock frequency (fmax) is 35 MHz.
- What is the propagation delay time for the SN74LS373DWR?
The propagation delay time (tPLH, tPHL) is typically between 12 and 18 ns.
- How does the buffered output-control (OC) input function?
The buffered output-control (OC) input allows the outputs to be placed in either a normal logic state or a high-impedance state.
- What is the storage temperature range for the SN74LS373DWR?
The storage temperature range (Tstg) is from -65 to 150°C.
- What package types are available for the SN74LS373DWR?
The SN74LS373DWR is available in a SOIC (DW) package with 20 pins.
