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Renesas 74CBTLV3244QG
- Part No.:
- 74CBTLV3244QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CBTLV3244QG.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
74CBTLV3244QG from Renesas Electronics is a low-voltage octal bus switch with dual 4-channel bi-directional switches, 5Ω on-resistance at 3.3V, VCC range of 2.3V–3.6V, and industrial temperature operation (−40°C to +85°C), used for high-speed 3.3V bus isolation and asynchronous data bus communication.
For engineers reviewing the 74CBTLV3244QG datasheet, 74CBTLV3244QG pinout, 74CBTLV3244QG application, or 74CBTLV3244QG equivalent, key selection criteria include OE-controlled channel enable/disable timing (tEN ≤ 4 ns), off-state isolation (IOFF ≤ 50 µA), over-voltage tolerance (−0.5V to +4.6V), and QSOP-20 package compatibility with legacy '244 logic footprints.
Technical Context
The 74CBTLV3244QG implements two independent 4-bit bi-directional bus switches, each controlled by a dedicated active-low Output Enable (1OE, 2OE). Switching is fully symmetrical: signal flow direction (A↔B) is determined solely by external voltage sources, not internal logic.
It features power-off isolation (IOFF ≤ 50 µA when VCC = 0), over-voltage tolerant I/Os (VI/O up to +4.6V regardless of VCC), and latch-up immunity exceeding 100 mA per JEDEC JESD78. No level-shifting or direction control logic is integrated - it operates as a passive, voltage-transparent analog switch array.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - supports core 2.5V and 3.3V logic domains without external regulators |
| RON (Typ.) | 5Ω at VCC = 3V, IO = 24mA - enables <100ps propagation delay (tPD ≤ 0.25ns) into 50pF loads |
| tEN / tDIS | 1–4.5ns - allows sub-nanosecond bus enable/disable for high-frequency burst-mode transfers |
| IOFF (Max) | 50µA at VCC = 0 - ensures robust signal isolation during hot-swap or partial-power-down sequences |
| VI/O Range | −0.5V to +4.6V - permits safe interfacing with mixed-supply systems and transient overvoltage events |
| ESD Rating | 2000V HBM, 200V MM - exceeds JEDEC JS-001/JS-002 for board-level handling in industrial environments |
Pinout & Package
74CBTLV3244QG is packaged in a 20-pin Quarter-Size Small Outline Package (QSOP, PCG20), 7.2mm × 5.3mm body, 0.65mm pitch, with exposed pad not present. Pin numbering follows standard '244 logic layout for drop-in replacement capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low enable inputs - drive low to connect corresponding A/B ports; tie to VCC via pullup for power-up high-impedance safety |
| 2–5, 11–14 | 1A1–1A4 / 2A1–2A4 | Port A bidirectional I/Os - electrically identical to Port B; no internal direction control |
| 6–9, 15–18 | 1B1–1B4 / 2B1–2B4 | Port B bidirectional I/Os - fully symmetric with Port A; RON matches across all 8 channels |
| 10, 20 | GND / VCC | Power terminals - decoupling capacitor (0.1µF) required between pins 10 and 20, close to device |
Key Features
| Feature | Design Value |
|---|---|
| PINOUT COMPATIBILITY | Matches standard '244 logic pin assignment - enables direct PCB replacement without layout changes |
| POWER-OFF ISOLATION | IOFF ≤ 50 µA when VCC = 0 - prevents back-driving and leakage between powered/unpowered subsystems |
| OVER-VOLTAGE TOLERANCE | I/Os withstand −0.5V to +4.6V regardless of VCC state - eliminates need for external clamping diodes |
| LATCH-UP IMMUNITY | Exceeds 100 mA per JEDEC JESD78 - ensures robustness in noisy industrial power environments |
Applications
| PCI Express Slot Interposer | Industrial PLC Backplane Isolation |
|---|---|
Use Scenario: Inserting a diagnostic or protocol analyzer module between PCIe root complex and endpoint without disrupting link training. IC Role / Device Role / Timing Role: Bidirectional, low-latency (tPD ≤ 0.25ns), transparent bus switch enabling live traffic pass-through while isolating fault domains. Use Value: Maintains PCIe Gen3 signal integrity with <5Ω RON and <6pF CIO(OFF), avoiding re-timing or protocol-aware logic. | Use Scenario: Segregating 24V I/O modules from 3.3V controller logic in modular PLC racks subject to ESD and surge transients. IC Role / Device Role / Timing Role: Voltage-tolerant (−0.5V to +4.6V) bus switch providing galvanic isolation during hot-swap and power sequencing. Use Value: Eliminates need for discrete protection circuitry while supporting >100k insertion cycles under industrial vibration. |
| Memory Subsystem Address Multiplexing | Test Access Port (TAP) Bus Sharing |
Use Scenario: Sharing a single DDR3 address/command bus among multiple memory controllers in redundant server architectures. IC Role / Device Role / Timing Role: Low-RON (5Ω typ.), low-CIO(OFF) (6pF) switch enabling sub-ns timing margin preservation across shared traces. Use Value: Avoids clock skew and setup/hold violations caused by added buffer latency or capacitance in multiplexed paths. | Use Scenario: Allowing JTAG boundary-scan access to multiple ASICs on a single test bus without physical disconnection. IC Role / Device Role / Timing Role: OE-gated bi-directional switch enabling time-multiplexed TCK/TMS/TDI/TDO routing with minimal added jitter. Use Value: Supports IEEE 1149.1 compliance at 25MHz+ scan rates due to tEN/tDIS ≤ 4.5ns and matched A/B path delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3244PWR | Same functional spec, TSSOP-20 (PGG20) package; 0.65mm pitch, slightly larger footprint than QSOP | Preferred where board space allows larger thermal mass or existing TSSOP land patterns exist | Select when thermal dissipation >128mA continuous channel current is required or TSSOP assembly infrastructure is standardized |
| 74LVC244APW | 3-state buffer (not analog switch); higher propagation delay (tPD ≈ 5ns), no power-off isolation, lower VI/O tolerance (−0.5V to VCC+0.3V) | Suitable only for simple unidirectional buffering where OE-controlled high-Z suffices | Choose only if directionality is fixed and over-voltage tolerance is not required - not a functional substitute for bidirectional isolation |
Compared with SN74CBTLV3244PWR and 74LVC244APW, the 74CBTLV3244QG uniquely delivers true bidirectional analog switching with power-off isolation and extended I/O voltage range - critical for hot-plug, mixed-supply, and high-reliability bus sharing where signal transparency and fault containment are mandatory.
Availability
74CBTLV3244QG is available at Aetrix Electronics and suitable for industrial PLC backplanes, PCIe interposers, memory subsystem multiplexing, and JTAG bus sharing requiring stable component supply across extended temperature and long production lifecycles.
Supply support for 74CBTLV3244QG 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74CBTLV3244QG belongs to Renesas' CBTLV low-voltage bus switch family, engineered specifically for high-speed, low-latency, bidirectional signal routing in 2.5V/3.3V industrial and communications systems requiring robust isolation and over-voltage resilience.
FAQ
What is the maximum continuous current rating per channel for the 74CBTLV3244QG?
The 74CBTLV3244QG supports a maximum continuous channel current of 128 mA per switch, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state DC conditions with proper PCB thermal design. Exceeding this current may cause irreversible degradation of the on-resistance or thermal runaway. The 74CBTLV3244QG must be operated within this limit across its full industrial temperature range (−40°C to +85°C) to ensure reliability and meet lifetime specifications.
Does the 74CBTLV3244QG require external pull-up resistors on its OE pins?
Yes, external pull-up resistors on 1OE and 2OE are strongly recommended. The 74CBTLV3244QG has no internal pull-ups, and tying OE high through a resistor (typically 4.7kΩ to VCC) ensures the switches remain in high-impedance state during power-up, power-down, or when OE is floating. This prevents unintended bus contention or back-driving, especially critical in systems with staggered power sequencing. The 74CBTLV3244QG datasheet explicitly states this requirement in Note 1 of the Operating Characteristics section.
Can the 74CBTLV3244QG be used to level-shift between 1.8V and 3.3V domains?
No, the 74CBTLV3244QG is not a level shifter. It is a passive analog switch with no internal voltage translation. Its I/Os are over-voltage tolerant (−0.5V to +4.6V), but the signal swing on either side is constrained by the local domain's supply and termination. To interface 1.8V and 3.3V logic, external series resistors or dedicated level-shifting ICs must be used - the 74CBTLV3244QG only passes signals within the voltage bounds imposed by connected drivers and receivers, not across them.
What is the typical on-state resistance (RON) of the 74CBTLV3244QG at 2.5V VCC?
At VCC = 2.5V, the typical on-state resistance (RON) of the 74CBTLV3244QG is 5Ω, measured with VI = 0V and IO = 64mA (per DC Electrical Characteristics table). This value is confirmed across both Port A and Port B channels and remains stable over the full industrial temperature range. The 74CBTLV3244QG maintains RON < 8Ω (max) under these conditions, ensuring minimal voltage drop and signal attenuation in high-speed digital paths.
Is the 74CBTLV3244QG pin-compatible with older 74ACT244 or 74ALS244 devices?
The 74CBTLV3244QG is pin-out compatible with standard '244 logic products, including 74ACT244 and 74ALS244, sharing identical 20-pin QSOP pin assignments (1OE, 1A1–1A4, 1B1–1B4, etc.). However, electrical behavior differs significantly: the 74CBTLV3244QG is a bi-directional analog switch, whereas '244 devices are unidirectional 3-state buffers. Direct substitution requires verifying system-level signal directionality, loading, and timing - the 74CBTLV3244QG cannot replicate output drive strength or logic-level translation of legacy '244s.
74CBTLV3244QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74CBTLV
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74CBTLV3244QG FAQ
1.How can I place an order for 74CBTLV3244QG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3244QG 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 74CBTLV3244QG reliable?
The price and inventory of 74CBTLV3244QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3244QG is usually 5 days.
3.What payment methods are accepted for 74CBTLV3244QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3244QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CBTLV3244QG?
74CBTLV3244QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3244QG 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 74CBTLV3244QG?
For technical support, including 74CBTLV3244QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3244QG requirements.
6.How does Aetrix verify that 74CBTLV3244QG is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3244QG 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 74CBTLV3244QG meets industry standards.
7.What is the process for return or replacement of 74CBTLV3244QG?
All 74CBTLV3244QG units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3244QG, 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 74CBTLV3244QG part is unused and in its original packaging.
Return procedure for 74CBTLV3244QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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