CD74HC374 - Octal D-Type Flip-Flop, 3-State | Texas Instruments
MPN: CD74HC374 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.29 | $29.00 |
| 500 | $0.24 | $120.00 |
| 1,000 | $0.19 | $190.00 |
Drop-in alternatives for CD74HC374 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74HC374N
β Drop-Inπ Reference alternative (not in catalog)
SN74HC374DWR
β Drop-Inπ Reference alternative (not in catalog)
CD74HCT374M96
β Drop-Inπ Reference alternative (not in catalog)
MC74HC374ADWR2
β Drop-Inπ Reference alternative (not in catalog)
74HC374D
β Drop-Inπ Reference alternative (not in catalog)
TC74HC374AF
β Drop-Inπ Reference alternative (not in catalog)
CD74HC374 Maximum Ratings & Electrical Characteristics
| Function | Octal D-Type Flip-Flop with 3-State Outputs |
| Technology Family | HC |
| Number of Channels | 8 |
| Supply Voltage (Min) | 2 V |
| Supply Voltage (Max) | 6 V |
| Output Type | 3-State |
| Clock Trigger Type | Positive Edge |
| Propagation Delay Time | 15 ns at 5V (typical) |
| Maximum Clock Frequency | 30 MHz at 5V (typical) |
| Output Current (Max) | 5.2 mA at 5V |
| Input Capacitance | 10 pF (typical) |
| Operating Temperature Range | -55C to +125C |
| Package Type | SOIC-20 (DW), PDIP-20 (N), TSSOP-20 (PW) |
| Mounting Type | Surface Mount or Through Hole |
| RoHS Status | Compliant |
CD74HC374 Pin Configuration
| Pin 1 | OE β Output Enable (active low) |
| Pin 2 | 1Q β Flip-flop 1 output |
| Pin 3 | 1D β Flip-flop 1 data input |
| Pin 4 | 2D β Flip-flop 2 data input |
| Pin 5 | 2Q β Flip-flop 2 output |
| Pin 6 | 3Q β Flip-flop 3 output |
| Pin 7 | 3D β Flip-flop 3 data input |
| Pin 8 | 4D β Flip-flop 4 data input |
| Pin 9 | 4Q β Flip-flop 4 output |
| Pin 10 | GND β Ground |
| Pin 11 | CP β Clock input (positive edge triggered) |
| Pin 12 | 5Q β Flip-flop 5 output |
| Pin 13 | 5D β Flip-flop 5 data input |
| Pin 14 | 6D β Flip-flop 6 data input |
| Pin 15 | 6Q β Flip-flop 6 output |
| Pin 16 | 7Q β Flip-flop 7 output |
| Pin 17 | 7D β Flip-flop 7 data input |
| Pin 18 | 8D β Flip-flop 8 data input |
| Pin 19 | 8Q β Flip-flop 8 output |
| Pin 20 | VCC β Positive supply voltage |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
CD74HC374 is suitable for 6 applications: Microprocessor Systems, Data Storage Registers, Address Decoding, Bus Interfacing, Digital Signal Processing, Communication Interfaces.
Microprocessor Systems
The CD74HC374 is used in microprocessor systems for data latching and bus interfacing. Its 3-state outputs allow multiple devices to share a common data bus without contention. The positive-edge-triggered flip-flops capture data synchronously with the system clock, ensuring reliable data transfer. With a propagation delay of 15 ns and a clock frequency of 30 MHz, it supports high-speed processors. The wide supply voltage range (2V-6V) makes it compatible with both 3.3V and 5V logic, and the high drive capability (15 LSTTL loads) ensures robust bus driving.
Recommended
Data Storage Registers
The CD74HC374 can be used as an 8-bit data storage register in digital systems. The flip-flops store data on the rising edge of the clock, providing a stable output for subsequent logic. The 3-state outputs allow the register to be disconnected from the bus when not in use, preventing bus conflicts. With a typical propagation delay of 15 ns, it is suitable for high-speed data paths. The device operates from 2V to 6V, making it ideal for battery-powered and low-voltage applications. Its low power consumption (CMOS) is an advantage in power-sensitive designs.
Recommended
Address Decoding
In memory and peripheral interfacing, the CD74HC374 can be used to latch address lines. The 3-state outputs allow the address bus to be shared between multiple devices. The positive-edge-triggered flip-flops ensure that address data is captured at the correct time. The device's high drive capability (15 LSTTL loads) allows it to drive multiple memory chips. With a maximum clock frequency of 30 MHz, it supports fast address decoding. The wide supply voltage range (2V-6V) ensures compatibility with various logic families.
Recommended
Bus Interfacing
The CD74HC374 is ideal for bus interfacing in systems with multiple peripherals. Its 3-state outputs allow the device to be isolated from the bus when not selected, preventing data corruption. The positive-edge-triggered flip-flops synchronize data with the bus clock, ensuring reliable communication. With a propagation delay of 15 ns, it supports high-speed bus protocols. The device can drive up to 15 LSTTL loads, making it suitable for heavily loaded buses. Its operating voltage range of 2V to 6V allows use in both 3.3V and 5V systems.
Recommended
Digital Signal Processing
In DSP systems, the CD74HC374 can be used for data buffering and synchronization. The flip-flops capture data on the rising edge of the clock, aligning data with the processing clock. The 3-state outputs allow multiple data sources to share a common bus. With a maximum clock frequency of 30 MHz, it supports moderate-speed DSP operations. The low power consumption of CMOS technology is beneficial in portable DSP applications. The wide supply voltage range (2V-6V) provides flexibility in system design.
Recommended
Communication Interfaces
The CD74HC374 is used in communication interfaces for data latching and buffering. Its 3-state outputs allow the device to be shared among multiple communication channels. The positive-edge-triggered flip-flops ensure data is captured at the correct timing. With a propagation delay of 15 ns, it supports high-speed serial and parallel communication. The device can drive 15 LSTTL loads, making it suitable for driving line drivers and receivers. Its operating voltage range of 2V to 6V is compatible with common logic levels.
Recommended
Recommended Products Summary
Engineering reference data for CD74HC374 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74HC374N | SN74HC374DWR | CD74HCT374M96 | MC74HC374ADWR2 | 74HC374D | TC74HC374AF |
|---|---|---|---|---|---|---|---|
| Package | SOIC-20, PDIP-20, TSSOP-20 | PDIP-20 | SOIC-20 | SOIC-20 | SOIC-20 | SOIC-20 | SOP-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | NXP Semiconductors | Toshiba |
| Supply Voltage Range | 2V to 6V | 2V to 6V | 2V to 6V | 4.5V to 5.5V | 2V to 6V | 2V to 6V | 2V to 6V |
| Propagation Delay (typ) | 15 ns at 5V | 15 ns at 5V | 15 ns at 5V | 15 ns at 5V | 15 ns at 5V | 15 ns at 5V | 15 ns at 5V |
| Max Clock Frequency | 30 MHz at 5V | 30 MHz at 5V | 30 MHz at 5V | 30 MHz at 5V | 30 MHz at 5V | 30 MHz at 5V | 30 MHz at 5V |
| Output Drive (LSTTL loads) | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Input Compatibility | CMOS | CMOS | CMOS | TTL | CMOS | CMOS | CMOS |
| Operating Temperature Range | -55C to +125C | -55C to +125C | -55C to +125C | -55C to +125C | -55C to +125C | -40C to +125C | -40C to +85C |
Key Differentiators
- Wide supply voltage range (2V to 6V) (vs CD74HCT374M96)
- High output drive capability (15 LSTTL loads) (vs TC74HC374AF)
- Wide operating temperature range (-55C to +125C) (vs 74HC374D)
Design Notes
The CD74HC374 operates from 2V to 6V. Ensure the supply voltage is within this range and stable. Use a 0.1uF decoupling capacitor close to the VCC pin and a 10uF bulk capacitor on the power rail to minimize noise. The device's low power consumption (CMOS) makes it suitable for battery-powered applications, but consider the dynamic power dissipation at high clock frequencies.
Place the CD74HC374 close to the bus or data lines it interfaces with to minimize trace lengths and reduce signal integrity issues. Use a solid ground plane and route the clock (CP) signal with controlled impedance if possible. Keep the OE pin properly terminated to avoid floating inputs. For high-speed operation, match trace lengths for data and clock lines to prevent skew.
Avoid bus contention by ensuring that only one device drives the bus at a time. The OE pin must be controlled correctly; when OE is high, the outputs are high-impedance, so other devices can drive the bus. Ensure the clock input is clean and free of glitches to prevent false triggering. Use Schmitt trigger buffers if the clock signal is noisy. Also, do not exceed the maximum clock frequency of 30 MHz to avoid timing violations.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified. Lead-free per TI's environmental data.
