Overview
The SN74HCT573DWR, produced by Texas Instruments, is an octal transparent D-type latch with 3-state outputs. This device is designed to drive highly capacitive or relatively low-impedance loads, making it suitable for various applications such as buffer registers, I/O ports, bidirectional bus drivers, and working registers. The latch-enable (LE) input allows the Q outputs to respond to the data (D) inputs when high, and latch the data when low. Additionally, a buffered output-enable (OE) input can place the outputs in a high-impedance state, which is useful for bus lines without the need for interface or pullup components.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 4.5 | 5 | 5.5 |
| VIH (High-Level Input Voltage) | V | 2 | 2 | |
| VIL (Low-Level Input Voltage) | V | 0.8 | 0.8 | |
| IOH (Output Current High) | mA | -20 | -6 | |
| IOL (Output Current Low) | mA | 20 | 6 | |
| ICC (Supply Current) | μA | 8 | 80 | |
| tpd (Propagation Delay D to Q) | ns | 21 | 32 | |
| tsu (Setup Time, Data before LE↓) | ns | 9 | 14 | |
| th (Hold Time, Data after LE↓) | ns | 5 | 5 | |
| TJ (Junction Temperature) | °C | 150 | ||
| Tstg (Storage Temperature) | °C | -65 | 150 | |
| Package Type | SOIC (20 pins) | |||
| Body Size (Nominal) | mm | 12.80 x 7.50 |
Key Features
- Operating voltage range of 4.5V to 5.5V
- High-Current 3-State Outputs capable of driving bus lines directly or up to 15 LSTTL loads
- Low power consumption with a maximum supply current (ICC) of 80 μA
- Typical propagation delay (tpd) of 21ns
- ±6-mA output drive at 5V
- Low input current of 1 μA maximum
- Inputs are TTL-Voltage compatible
- Bus-structured pinout
Applications
The SN74HCT573DWR is particularly suitable for implementing:
- Buffer registers
- I/O ports
- Bidirectional bus drivers
- Working registers
Q & A
- What is the operating voltage range of the SN74HCT573DWR?
The operating voltage range is from 4.5V to 5.5V.
- What is the typical propagation delay of the SN74HCT573DWR?
The typical propagation delay (tpd) is 21ns.
- What is the maximum supply current (ICC) of the SN74HCT573DWR?
The maximum supply current (ICC) is 80 μA.
- What are the high-level and low-level input voltage ranges for the SN74HCT573DWR?
The high-level input voltage (VIH) is 2V, and the low-level input voltage (VIL) is 0.8V.
- What is the output drive capability of the SN74HCT573DWR at 5V?
The output drive capability is ±6 mA at 5V.
- What is the maximum junction temperature for the SN74HCT573DWR?
The maximum junction temperature (TJ) is 150°C.
- What types of applications is the SN74HCT573DWR suitable for?
The device is suitable for buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the package type and body size of the SN74HCT573DWR?
The package type is SOIC (20 pins), and the body size is 12.80 mm x 7.50 mm.
- How does the output-enable (OE) input function in the SN74HCT573DWR?
The OE input can place the outputs in either a normal logic state or a high-impedance state, without affecting the internal operations of the latches.
- What is the setup time and hold time for the data input relative to the latch-enable (LE) input?
The setup time (tsu) is 9-14 ns, and the hold time (th) is 5 ns.
