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STMicroelectronics 74LCX373MTR
- Part No.:
- 74LCX373MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX373MTR.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
74LCX373MTR from STMicroelectronics is an octal D-type transparent latch with non-inverting 3-state outputs, 5V-tolerant I/O, and operation at 2.0–3.6 V. It features 8.0 ns max propagation delay at VCC = 3.0 V, ±24 mA output drive, symmetrical output impedance, and latch-enable + output-enable control logic. Used in 3.3V bus interface and data buffering where 5V legacy signal compatibility is required.
For engineers reviewing the 74LCX373MTR datasheet, 74LCX373MTR pinout, 74LCX373MTR application, or 74LCX373MTR equivalent, key selection criteria include 5V-tolerant input/output capability, 3-state output timing (tPZL/tPHZ ≤ 8.5 ns), latch enable setup/hold timing (tS = 2.5 ns, th = 1.5 ns), and SO-20 package thermal and mechanical compliance.
Technical Context
The 74LCX373 implements a dual-control transparent latch architecture: LE determines data transparency vs. latching, while OE independently enables/disables all eight Q outputs into high-impedance state. Its sub-micron C2MOS process enables 3.3V-speed parity with 5V AC/ACT families while reducing ICC to 10 µA typical.
All inputs and outputs feature integrated protection diodes rated for ±50 mA DC current and ESD immunity >2 kV HBM. The device guarantees PCI bus signaling levels at 24 mA drive, with balanced tPLH ≅ tPHL and output skew ≤1.0 ns across all eight channels under 3.0–3.6 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.0 V to 3.6 V - supports mixed-voltage system interfacing with 1.5 V data retention during power-down |
| tPD (D→Q) | 8.0 ns max at VCC = 3.0 V - matches 5V AC/ACT speed at lower voltage, enabling drop-in replacement in timing-critical buffers |
| IOL / IOH | ±24 mA min at VCC = 3.0–3.6 V - drives standard PCI loads without external buffers |
| 5V Tolerance | Inputs and outputs withstand 0–5.5 V - allows direct connection to 5V buses without level shifters |
| Output Skew | ≤1.0 ns - ensures simultaneous edge alignment across all 8 outputs for synchronous bus capture |
| Power-Down Leakage | 10 µA max ICC at VI/VO = 5.5 V - prevents back-driving and signal corruption when VCC = 0 V |
Pinout & Package
74LCX373MTR is supplied in a 20-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-013, with 1.27 mm pitch, 12.6–13.0 mm body length, and 10.0–10.65 mm body width. Thermal resistance θJA ≈ 110 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Active-Low Output Enable) | Global 3-state control: low = normal Q output; high = high-Z - enables bus sharing without contention |
| 2,5,6,9,12,15,16,19 | D0–D7 (Data Inputs) | Asynchronous data inputs tolerant to 0–5.5 V - accept 5V logic levels while powered from 3.3V supply |
| 3,4,7,8,13,14,17,18 | Q0–Q7 (3-State Outputs) | Non-inverting latched outputs with ±24 mA drive and 5V tolerance - directly drive 5V TTL/CMOS loads |
| 11 | LE (Latch Enable) | Transparent latch control: high = Q follows D; low = Q holds last D value - provides precise data capture timing |
| 10 | GND | Reference ground for all I/O and internal logic - must be low-inductance connection to minimize switching noise |
| 20 | VCC | Primary supply pin (2.0–3.6 V) - powers internal logic and output drivers; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Supports direct interconnection with 5V systems without level translation circuitry or risk of damage |
| Symmetrical Output Drive | |IOH| = IOL = 24 mA min ensures matched rise/fall times and reduced bus skew in multi-drop configurations |
| Power-Down Protection | Input/output clamping diodes remain active even when VCC = 0 V - prevents back-powering and latch-up during hot-swap |
| Latch-Up Immunity | >500 mA per JESD17 - eliminates risk of destructive latch-up in noisy industrial environments |
| PCI Bus Compliance | Guaranteed 24 mA drive at 3.3 V meets PCI Local Bus Specification Rev. 2.2 electrical requirements |
Applications
| Industrial PLC Backplane Interface | Embedded Memory Address Latching |
|---|---|
Use Scenario: Isolating 3.3V microcontroller address/data bus from legacy 5V peripheral modules on a modular I/O rack. IC Role / Device Role / Timing Role: Octal latch captures and holds 8-bit address segment during memory access cycles; OE enables shared bus arbitration. Use Value: Eliminates need for discrete level shifters while maintaining <8.5 ns output enable/disable timing for cycle-accurate bus handshaking. |
Use Scenario: Holding upper address bits for SRAM or Flash memory during multiplexed bus access in ARM Cortex-M4-based controllers. IC Role / Device Role / Timing Role: Transparent latch synchronizes asynchronous address strobes to core clock domain; LE timed to ALE assertion. Use Value: Enables reliable 100 MHz+ bus operation with guaranteed 2.5 ns setup/1.5 ns hold margin relative to LE edge. |
| PCI-Compatible Peripheral Bridge | Low-Power FPGA I/O Expansion |
Use Scenario: Buffering configuration registers between a 3.3V FPGA and 5V PCI slot interface in embedded instrumentation cards. IC Role / Device Role / Timing Role: Bidirectional latch provides 5V-tolerant register read/write path; OE toggled per PCI FRAME# and IRDY# handshake. Use Value: Meets PCI 2.2 DC specs (24 mA drive, 5V tolerance) and AC timing (≤8.5 ns tPZL) without external components. |
Use Scenario: Expanding I/O count on battery-powered FPGA-based sensor nodes by latching GPIO status before deep-sleep mode. IC Role / Device Role / Timing Role: Data latch retains critical I/O states during VCC ramp-down; 1.5 V data retention preserves configuration across power cycles. Use Value: Reduces system wake-up latency by eliminating re-initialization of external peripherals after sleep recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC373PW,118 (Nexperia) | Lower VCC range (1.65–3.6 V); 6.5 ns tPD at 3.3 V; no 5V tolerance on outputs (inputs only) | Requires external clamping for 5V bus driving; suitable only for 3.3V-only systems with tighter timing budgets | Select when 5V output drive is unnecessary and propagation delay is prioritized over voltage flexibility |
| SN74LVCH16373A (TI) | 16-bit, 3.3V-only (1.65–3.6 V); 5.6 ns tPD; no 5V tolerance; TSSOP-48 package | Designed for wide-bus parallel interfaces (e.g., memory expansion); incompatible pinout and voltage domain | Choose for higher-density 16-bit latching where board space permits larger package and 5V tolerance is not needed |
Compared with 74LVC373PW and SN74LVCH16373A, the 74LCX373MTR uniquely combines 5V-tolerant I/O, SO-20 footprint, and PCI-compliant 24 mA drive - making it the only option for retrofitting 5V legacy bus segments into 3.3V designs without redesign.
Availability
74LCX373MTR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, embedded memory address latching, and PCI-compatible peripheral bridge circuits requiring stable component supply and long-term obsolescence management.
Supply support for 74LCX373MTR 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, specializing in automotive, industrial, and power management ICs with broad analog, digital, and mixed-signal portfolios.
The 74LCX logic family was engineered for 3.3V system integration with 5V legacy compatibility, targeting high-speed, low-power bus interface and data capture applications in industrial control and communications infrastructure.
FAQ
Can 74LCX373MTR operate with VCC = 2.5 V while interfacing to a 5V microcontroller?
Yes. The device operates across 2.0–3.6 V and tolerates 0–5.5 V on all inputs and outputs regardless of VCC. At VCC = 2.5 V, output drive drops to ±12 mA (per datasheet Table 3), sufficient for short traces to 5V CMOS loads but not full PCI bus loading. Input thresholds remain valid (VIH = 2.0 V, VIL = 0.8 V).
What is the maximum clock frequency supported for LE-controlled latching?
The 74LCX373MTR does not use a clock; it is edge-triggered only by LE transitions. Maximum effective data rate depends on LE pulse width (≥3.3 ns min) and setup/hold timing (tS = 2.5 ns, th = 1.5 ns). With proper timing margins, it reliably captures data up to ~100 MHz LE toggle rate in high-speed bus applications.
Does the 74LCX373MTR require external pull-up resistors on OE or LE pins?
No. OE and LE are CMOS-compatible active-low inputs with ±5 µA leakage (max) and defined VIH/VIL thresholds. Pull-ups are unnecessary unless system-level noise immunity requires forced default state; if used, 10–100 kΩ values are typical and do not affect AC timing.
How does the 74LCX373MTR handle simultaneous switching of all eight outputs?
Dynamic output noise is controlled via specified VOLP (±0.8 V) and VOLV (−0.8 V) limits under CL = 50 pF load. The device's symmetrical drive strength and low output capacitance (12 pF typ.) minimize ground bounce and crosstalk. Decoupling (100 nF ceramic near VCC/GND) is mandatory for full 8-bit switching at 100 MHz-equivalent edges.
74LCX373MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 2V ~ 3.6V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 1.5ns
- Current - Output High, Low:
- 24mA, 24mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74LCX373MTR FAQ
1.How can I place an order for 74LCX373MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX373MTR 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 74LCX373MTR reliable?
The price and inventory of 74LCX373MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX373MTR is usually 5 days.
3.What payment methods are accepted for 74LCX373MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX373MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX373MTR?
74LCX373MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX373MTR 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 74LCX373MTR?
For technical support, including 74LCX373MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX373MTR requirements.
6.How does Aetrix verify that 74LCX373MTR is sourced from the original manufacturer or authorized distributors?
All 74LCX373MTR 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 74LCX373MTR meets industry standards.
7.What is the process for return or replacement of 74LCX373MTR?
All 74LCX373MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX373MTR, 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 74LCX373MTR part is unused and in its original packaging.
Return procedure for 74LCX373MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LCX373MTR Tags
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SN74AHC573PWR
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SN74HCT573DWR
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74VHC573MTCX
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MC74LCX573DTR2G
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74AUP1G373GW,125
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NC7SZ373P6X
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