My Inquiry
My Account
Texas Instruments CD74FCT244M
- Part No.:
- CD74FCT244M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT244M.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74FCT244M from Texas Instruments is a BiCMOS octal noninverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in 5-V TTL-compatible systems. It features dual 4-bit sections with independent active-low OE controls, 64-mA sink capability per output, 3.7-V limited high-level output swing, and SCR latch-up resistance. Used in address/data bus buffering for microcontroller peripherals and memory expansion.
For engineers reviewing the CD74FCT244M datasheet, CD74FCT244M pinout, CD74FCT244M application, or CD74FCT244M equivalent, key selection criteria include 3-state drive strength, EMI-reducing output voltage clamping, SOIC-20 thermal performance (θJA = 58°C/W), and compatibility with 5-V TTL logic families.
Technical Context
The CD74FCT244M implements a BiCMOS output stage combining bipolar pull-down and CMOS pull-up transistors to clamp VOH at ~3.7 V (two diode drops below VCC), reducing power-bus ringing and ground bounce during simultaneous switching. Its input structure includes buffered inputs with TTL-compatible thresholds (VIL = 0.8 V, VIH = 2 V) and low input capacitance (Ci = 10 pF).
Each of the two 4-bit sections operates independently: when OE is low, A→Y data passes transparently; when OE is high, outputs enter high-impedance state. Propagation delay is 4.5 ns typical (A→Y), enable/disable times are 6 ns/5 ns typical (OE→Y), and quiescent ICC is 8 µA minimum at 5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation across standard 5-V supply tolerances without level-shifting. |
| IOL per Output | 64 mA - Supports direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| VOH Clamping | ≤3.7 V - Limits high-level output swing to reduce EMI and supply rail disturbance during fast switching. |
| tpd (A→Y) | 1.5–6.5 ns - Enables high-speed bus buffering in real-time control and data acquisition timing budgets. |
| θJA | 58°C/W - Confirmed for SOIC (DW) package; enables thermal design for continuous 8-output switching at full load. |
| Input Capacitance | Ci = 10 pF - Minimizes loading on upstream drivers and preserves signal integrity in high-frequency traces. |
| Power Dissipation Cap. | Cpd = 35 pF - Predicts dynamic power consumption under 1-MHz toggle conditions for system-level power budgeting. |
Pinout & Package
CD74FCT244M is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 2.65 mm max height, with 1.27 mm pitch and gull-wing leads. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Section 1 (pins 2–5, 18–15) and Section 2 (pins 13–16, 7–4); tied to VCC via pullup for power-up high-Z safety. |
| 2–5, 18–15 | 1A1–1A4, 1Y1–1Y4 | Section 1 input/output pairs; noninverting path with 3-state control-used for isolated 4-bit data lanes. |
| 13–16, 7–4 | 2A1–2A4, 2Y1–2Y4 | Section 2 input/output pairs; electrically identical to Section 1 but independently enabled-supports dual-bus arbitration. |
| 10, 20 | GND, VCC | Power pins placed diagonally for optimal decoupling; requires local 0.1-µF ceramic capacitor at VCC pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Architecture | Combines bipolar sink + CMOS source to achieve 64-mA drive while limiting VOH to 3.7 V-reducing EMI without sacrificing speed. |
| SCR Latch-Up Resistance | Qualified per JEDEC JESD78; withstands >200 mA IIK and >50 mA IOK-ensures robustness in noisy industrial environments. |
| Controlled Edge Rates | Output slew rate limited by internal design (not external resistors); reduces crosstalk and signal integrity issues on dense PCBs. |
| Input/Output Isolation from VCC | Internal circuitry prevents back-drive current flow into VCC during hot-swap or partial-power-down scenarios. |
| Low Quiescent Power | ICC = 8 µA min at 5.25 V - enables use in always-on subsystems without thermal penalty. |
Applications
| Microcontroller Bus Expansion | Memory Address Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count of an MSP430 or C2000 MCU to drive parallel LCD segments and keypad scan lines. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU port pins from higher-capacitance display bus; OE synchronized to display update cycle. Use Value: 64-mA sink per output drives 10+ LCD segment lines directly; 3.7-V VOH prevents overvoltage stress on 5-V tolerant LCD drivers. |
Use Scenario: Buffering 16-bit address lines between ARM Cortex-M7 and external SRAM/Flash in a real-time motion controller. IC Role / Device Role / Timing Role: Dual-section octal buffer providing matched propagation delay (<6.5 ns) across all address bits to maintain setup/hold timing margins. Use Value: Low tpd variation (±0.5 ns typical) ensures deterministic address valid window; SOIC thermal profile supports sustained 20-MHz bus operation. |
| Industrial I/O Module Backplane | Digital Test Equipment Signal Routing |
|
Use Scenario: Isolating field-side digital inputs (24 V optocoupler outputs) from 5-V PLC CPU backplane in modular I/O chassis. IC Role / Device Role / Timing Role: Level-translating buffer with TTL-compatible inputs accepting 0.8 V/2 V thresholds; OE controlled by module presence detection. Use Value: Input isolation from VCC prevents backfeeding during hot-insertion; SCR-latchup immunity survives transient coupling from adjacent 24-V channels. |
Use Scenario: Multiplexing stimulus signals from FPGA-based pattern generator to 8 DUT channels in automated test equipment. IC Role / Device Role / Timing Role: 3-state driver enabling one-to-many signal fanout with channel-selective enable; minimal propagation skew maintains vector timing integrity. Use Value: 10-pF input capacitance preserves fast edge fidelity from FPGA outputs; 35-pF Cpd enables accurate power modeling for thermal management of densely packed test boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F244N | Same pinout, TTL-input/outputs; no VOH clamping (VOH ≈ VCC–0.5 V), higher ICC (20 mA typ), no SCR latch-up rating. | Lacks EMI reduction and latch-up immunity; suitable only for legacy TTL-only systems with clean power rails. | Choose SN74F244N only if replacing existing F-series designs where VOH swing and latch-up are not concerns. |
| 74ACT244SCX | CMOS process; rail-to-rail VOH/VOL, 24-mA drive, lower Cpd (20 pF); same SOIC-20 footprint but different pin mapping (OE on pins 1/19 vs. 1/2). | Higher noise margin but lower drive strength; incompatible pinout prevents drop-in replacement. | Select 74ACT244SCX when lower power and rail-swing compatibility outweigh need for 64-mA drive and pin compatibility. |
Compared with SN74F244N and 74ACT244SCX, the CD74FCT244M uniquely delivers 64-mA sink current with EMI-suppressing 3.7-V VOH clamping and verified SCR latch-up immunity-making it the preferred choice for industrial bus interfaces requiring robustness and signal integrity.
Availability
CD74FCT244M is available at Aetrix Electronics and suitable for industrial I/O modules, microcontroller peripheral expansion, and memory interface buffering requiring stable component supply and long-term lifecycle support.
Supply support for CD74FCT244M includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in high-reliability industrial and automotive ICs.
The CD74FCT244M belongs to TI's 74FCT logic family, engineered for 5-V TTL-compatible systems demanding low-noise bus driving, EMI control, and latch-up immunity in harsh electrical environments.
FAQ
What is the maximum output sink current specification for CD74FCT244M?
The CD74FCT244M is rated for 64 mA DC sink current per output pin under recommended operating conditions (VCC = 4.75 V, TA = 25°C). Absolute maximum rating is 70 mA, but sustained operation above 64 mA may exceed thermal limits in SOIC package. This value is confirmed in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of the SCBS722B datasheet.
Does CD74FCT244M support true 5-V TTL input compatibility?
Yes, CD74FCT244M meets standard TTL input thresholds: VIL ≤ 0.8 V (guaranteed low) and VIH ≥ 2.0 V (guaranteed high) across 0°C to 70°C. Its buffered inputs draw only ±0.1 µA at VCC or GND, ensuring compatibility with legacy 74LS and 74F outputs without loading issues.
Why does CD74FCT244M limit VOH to 3.7 V instead of rail-to-rail?
The CD74FCT244M uses a BiCMOS output stage that clamps VOH to approximately two diode drops below VCC (≈3.7 V at 5 V), intentionally reducing output voltage swing. This design minimizes power-bus ringing, VCC bounce, and ground bounce during simultaneous switching-critical for EMI-sensitive industrial and test equipment applications.
Is CD74FCT244M pin-compatible with CD74FCT244ATM96?
No-CD74FCT244M and CD74FCT244ATM96 share the same SOIC-20 (DW) package and pinout, but differ in speed grade and input threshold. CD74FCT244ATM96 has faster tpd (3.8 ns typ vs. 4.5 ns) and tighter VIH/VIL specs (VIH = 2.0 V min, same as CD74FCT244M), but both use identical pin mapping per TI's DW package drawing.
What thermal derating applies to CD74FCT244M at elevated ambient temperatures?
With θJA = 58°C/W in SOIC package, CD74FCT244M's maximum allowable power dissipation decreases linearly above 25°C ambient. At 70°C TA, maximum safe ICC is reduced to ~80 µA (per datasheet ICC max = 80 µA at 5.25 V, 70°C), requiring careful current summation across all eight outputs to avoid exceeding junction temperature limits.
CD74FCT244M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74FCT244M FAQ
1.How can I place an order for CD74FCT244M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT244M on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74FCT244M reliable?
The price and inventory of CD74FCT244M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT244M is usually 5 days.
3.What payment methods are accepted for CD74FCT244M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT244M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT244M?
CD74FCT244M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT244M order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74FCT244M?
For technical support, including CD74FCT244M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT244M requirements.
6.How does Aetrix verify that CD74FCT244M is sourced from the original manufacturer or authorized distributors?
All CD74FCT244M products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74FCT244M meets industry standards.
7.What is the process for return or replacement of CD74FCT244M?
All CD74FCT244M units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT244M, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74FCT244M part is unused and in its original packaging.
Return procedure for CD74FCT244M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74FCT244M Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
