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STMicroelectronics M74HCT652RM13TR
- Part No.:
- M74HCT652RM13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HCT652RM13TR.pdf
- Description:
- IC TRANSCVR 8BIT NON-INV 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
M74HCT652RM13TR from STMicroelectronics is an octal bus transceiver and register with 3-state outputs, implementing bidirectional data flow between A and B buses with edge-triggered clocking, real-time or registered transfer selection, and dual-direction enable control. It operates at 55 MHz (typ.) at VCC = 4.5 V, delivers symmetrical 6 mA output drive, supports TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and is used in legacy industrial backplane interfaces requiring synchronized bus isolation.
For engineers reviewing the M74HCT652RM13TR datasheet, M74HCT652RM13TR pinout, M74HCT652RM13TR application, or M74HCT652RM13TR equivalent, key selection considerations include its dual-clock (CAB/CBA) edge-triggered register capability, independent A↔B direction control (GAB/GBA), real-time vs. stored-data select logic (SAB/SBA), and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The device integrates eight D-type flip-flops with separate A-to-B and B-to-A clock inputs (CAB, CBA), enabling asynchronous latching of data on either bus regardless of GAB/GBA state. Select pins SAB and SBA determine whether transceiver outputs reflect live bus signals or registered values - low = real-time, high = stored.
Propagation delays are balanced (tPLH ≅ tPHL), with typical bus-to-bus delay of 30 ns and clock-to-bus delay of 44 ns at VCC = 4.5 V, CL = 50 pF. Output enable/disable times (tPZL/tPLZ) are 35 ns typ., supporting fast bus arbitration in multiplexed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 55 MHz (typ.) at VCC = 4.5 V - defines maximum synchronous clock rate for register updates |
| IOH / IOL | ±6 mA (min.) - ensures robust drive into standard TTL loads without external buffering |
| tPLH / tPHL | 30 ns (typ., bus-to-bus) - enables sub-33 ns cycle timing in bidirectional data paths |
| VIH / VIL | 2.0 V (min.) / 0.8 V (max.) - guarantees interoperability with legacy 5 V TTL logic families |
| ICC (quiescent) | 4 µA (max. at TA = 25°C) - supports low-static-power operation in always-on control modules |
| CPD | 39 pF - used to calculate dynamic current ICC(opr) = CPD × VCC × fIN + ICC/8 per channel |
Pinout & Package
TSSOP-24 package: 24-pin thin shrink small outline package, 0.65 mm pitch, body width 4.4 mm, lead count 24, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CAB) | A-to-B Clock Input | Edge-triggered input capturing A-bus data into internal DFFs on rising edge |
| 2 (SAB) | A-to-B Select Input | Low = real-time A→B transfer; high = registered A→B output from flip-flops |
| 3 (GAB) | A-to-B Enable Input | Active-high control enabling A-bus drivers toward B-bus |
| 4–11 (A1–A8) | A-Bus I/O Terminals | Bidirectional 3-state terminals connecting to A-side system bus |
| 13–20 (B1–B8) | B-Bus I/O Terminals | Bidirectional 3-state terminals connecting to B-side peripheral or memory bus |
| 21 (GBA) | B-to-A Enable Input | Active-high control enabling B-bus drivers toward A-bus |
| 22 (SBA) | B-to-A Select Input | Low = real-time B→A transfer; high = registered B→A output from flip-flops |
| 23 (CBA) | B-to-A Clock Input | Edge-triggered input capturing B-bus data into internal DFFs on rising edge |
| 12 (GND) | Ground Reference | Primary 0 V reference for all logic and I/O circuits |
| 24 (VCC) | Positive Supply | 5 V ±10% supply powering internal logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | CAB and CBA allow asynchronous registration of A-bus and B-bus data without cross-dependency |
| Real-time/register mode select | SAB/SBA pins provide per-direction choice between transparent or latched bus behavior |
| Simultaneous enable support | GAB and GBA both active enables bus-hold reinforcement: outputs mirror inputs while other sources are high-Z |
| ESD-protected inputs | All inputs include diode clamps to VCC/GND, rated for ±2 kV HBM per JEDEC JS-001 |
Applications
| Industrial Backplane Interface | Legacy Memory Expansion Bus |
|---|---|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver with register hold capability synchronizing burst transfers across mismatched clock domains. Use Value: Eliminates need for external latch ICs by storing address strobes and data during slot arbitration cycles. | Use Scenario: Interfacing 8-bit microcontroller to parallel EEPROM or SRAM modules with shared data/address lines. IC Role / Device Role / Timing Role: Octal 3-state buffer with clocked register enabling clean separation of read/write phases and address latching. Use Value: Reduces PCB trace count by reusing same bus lines for address setup and data transfer via controlled direction switching. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Multiplexing stimulus signals between multiple DUT channels in boundary-scan test systems. IC Role / Device Role / Timing Role: Registered transceiver providing glitch-free signal routing with precise edge-aligned capture. Use Value: Enables deterministic sampling of DUT responses using CAB/CBA clocks aligned to test pattern generator edges. | Use Scenario: Controlling relay banks and sensor inputs in factory-floor functional testers with fixed-timing sequences. IC Role / Device Role / Timing Role: Synchronized bus interface holding control word states during mechanical actuation delays. Use Value: Maintains stable relay driver outputs during solenoid settling time using internal DFF storage instead of software polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT652N | DIP-24 package only; no TSSOP option; identical AC/DC specs and pinout | Preferred for through-hole prototyping or legacy wave-soldered assemblies | Select when board assembly uses DIP sockets or manual soldering processes |
| 74LCX652M | Lower VCC range (2.0–3.6 V); higher speed (tPLH = 22 ns typ.); not TTL-input compatible | Requires level-shifting for 5 V TTL systems; suited for mixed-voltage 3.3 V subsystems | Choose only if migrating to 3.3 V logic and redesigning input interface circuitry |
Compared with SN74HCT652N and 74LCX652M, M74HCT652RM13TR uniquely combines 5 V TTL compatibility, TSSOP-24 footprint, and dual-clock register functionality - making it the sole drop-in replacement for space-constrained industrial boards requiring legacy signal integrity.
Availability
M74HCT652RM13TR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory expansion buses, automated test fixture control, and boundary-scan signal routing requiring stable component supply across extended temperature ranges (−55 °C to +125 °C).
Supply support for M74HCT652RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
M74HCT652RM13TR belongs to the HCT logic family - engineered for 5 V TTL-compatible operation with CMOS power efficiency, targeting industrial control, instrumentation, and legacy system upgrades where pin-for-pin compatibility and wide temperature resilience are critical.
FAQ
What is the function of the SAB and SBA pins?
SAB and SBA are select inputs that determine whether transceiver outputs reflect real-time bus signals (low state) or data stored in internal D-type flip-flops (high state). When SAB = L, A-bus outputs show live B-bus data; when SAB = H, they show data previously latched on CAB's rising edge. SBA operates identically for B-bus outputs using CBA.
Can M74HCT652RM13TR operate at 3.3 V?
No - the device is specified only for VCC = 4.5 V to 5.5 V. At 3.3 V, VIH minimum (2.0 V) exceeds 60% of VCC, violating input threshold requirements, and output drive (IOH/IOL) falls below guaranteed 6 mA specification. Operation outside recommended conditions risks metastability and bus contention.
How does simultaneous assertion of GAB and GBA affect bus behavior?
When both GAB and GBA are high, the A and B buses enter a "bus-hold" mode: each side's outputs reinforce their own inputs. If all other drivers on both buses are high-impedance, the buses retain their last driven state - effectively acting as passive latches without clocking, useful for maintaining bus state during arbitration pauses.
Is there a recommended decoupling strategy for this device?
Yes - place one 100 nF X7R ceramic capacitor between VCC (pin 24) and GND (pin 12) within 5 mm of the TSSOP-24 package. For systems with >10 MHz clock activity, add a 10 nF capacitor in parallel. Avoid shared vias between decoupling caps and signal return paths to prevent ground bounce during 6 mA output transitions.
M74HCT652RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
M74HCT652RM13TR FAQ
1.How can I place an order for M74HCT652RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HCT652RM13TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of M74HCT652RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT652RM13TR is usually 5 days.
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6.How does Aetrix verify that M74HCT652RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HCT652RM13TR 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 M74HCT652RM13TR meets industry standards.
7.What is the process for return or replacement of M74HCT652RM13TR?
All M74HCT652RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT652RM13TR, 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 M74HCT652RM13TR part is unused and in its original packaging.
Return procedure for M74HCT652RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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