Overview
The SN74HC373N is an 8-bit transparent D-type latch produced by Texas Instruments. This component 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 device features eight high-current latches in a single package, with full parallel access for loading data. The latch-enable (LE) input controls the latching of the outputs, and an output-enable (OE) input allows the outputs to be placed in a high-impedance state, which is useful for bus applications without the need for interface or pullup components.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| Operating Temperature Range | -40 | 85 | °C | |
| High-Level Input Voltage (VIH) at VCC = 6V | 4.2 | 4.2 | V | |
| Low-Level Input Voltage (VIL) at VCC = 6V | 1.8 | 1.8 | V | |
| Input Current (II) | 1 | µA | ||
| Output Drive at 5V | ±6 | mA | ||
| Propagation Delay Time (tpd) at VCC = 6V | 13 | 38 | ns | |
| Power Dissipation Capacitance per Latch | 100 | pF |
Key Features
- Wide operating voltage range of 2 V to 6 V.
- High-current 3-state true outputs can drive up to 15 LSTTL loads.
- Low power consumption, 80 µA max ICC.
- Typical propagation delay time (tpd) of 13 ns at VCC = 6 V.
- ±6 mA output drive at 5 V.
- Low input current of 1 µA max.
- Eight high-current latches in a single package.
- Full parallel access for loading data.
Applications
- Buffer registers: Suitable for buffering data in digital systems.
- I/O ports: Can be used to implement input/output ports with 3-state outputs.
- Bidirectional bus drivers: Capable of driving bus lines without interface or pullup components.
- Working registers: Useful in applications requiring temporary storage of data.
Q & A
- What is the operating voltage range of the SN74HC373N?
The operating voltage range is from 2 V to 6 V.
- How many latches are included in the SN74HC373N?
The device includes eight high-current latches in a single package.
- What is the maximum output drive current at 5 V?
The maximum output drive current is ±6 mA at 5 V.
- What is the typical propagation delay time (tpd) at VCC = 6 V?
The typical propagation delay time is 13 ns at VCC = 6 V.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input places the outputs in either a normal logic state or the high-impedance state.
- What is the maximum power consumption (ICC) of the SN74HC373N?
The maximum power consumption is 80 µA.
- What is the operating temperature range for the SN74HC373N?
The operating temperature range is from -40°C to 85°C.
- Can the SN74HC373N drive highly capacitive loads?
Yes, the device is designed to drive highly capacitive or relatively low-impedance loads.
- How does the latch-enable (LE) input function?
While the LE input is high, the Q outputs follow the D inputs. When LE is taken low, the Q outputs are latched at the levels set up at the D inputs.
- What is the power dissipation capacitance per latch?
The power dissipation capacitance per latch is 100 pF.
