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Texas Instruments SN74HCS237DR
- Part No.:
- SN74HCS237DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCS237DR.pdf
- Description:
- HIGH SPEED CMOS LOGIC 3-TO-8 LIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
SN74HCS237DR from Texas Instruments is a 3-to-8 line decoder/demultiplexer with latched address inputs, Schmitt-trigger inputs, and dual strobe control (G0 active-high, G1 active-low). It operates from 2 V to 6 V, delivers ±7.8 mA output drive at 6 V, supports –40°C to +125°C ambient temperature, and features typical ICC of 100 nA. It enables memory device selection on shared data buses using minimal GPIO resources.
For engineers reviewing the SN74HCS237DR datasheet, SN74HCS237DR pinout, SN74HCS237DR application, or SN74HCS237DR equivalent, key selection criteria include latch-enable polarity (active-low LE), Schmitt-trigger hysteresis (ΔVT = 0.6–1.6 V), output enable logic (dual strobes), and SOIC-16 package compatibility with industrial temperature operation.
Technical Context
The SN74HCS237DR implements a CMOS-based 3:8 decoder with integrated address latches controlled by an active-low latch enable (LE) signal. When LE is low, the device functions as a standard one-of-eight decoder; when LE is high, it holds the last valid address state regardless of A2–A0 transitions.
Two independent strobe inputs-G0 (active-high) and G1 (active-low)-provide flexible output gating: either strobe asserted forces all eight outputs (Y0–Y7) low. Outputs are push-pull, CMOS-compatible, and normally low except for the selected channel, which goes high when enabled and addressed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - Enables direct interface with 3.3 V and 5 V logic systems without level shifters. |
| Output Drive | ±7.8 mA at 6 V - Sufficient to directly drive multiple standard CMOS inputs or small LED loads. |
| Input Hysteresis | 0.6–1.6 V (ΔVT) - Rejects noise up to ±800 mV peak-to-peak on slow-rising/falling address lines. |
| Quiescent Current | Typical ICC = 100 nA - Supports ultra-low-power battery-backed or always-on industrial control nodes. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive, motor drives, and industrial PLC environments. |
| Propagation Delay | 6–17 ns (tpd) at 6 V - Ensures timing-critical address decoding in sub-50 MHz digital subsystems. |
| Input Leakage | ±100 nA max at 6 V - Minimizes voltage droop on high-impedance address bus traces. |
Pinout & Package
SN74HCS237DR is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27 mm pitch and gull-wing leads compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | A0, A1, A2 | Binary address select inputs - Determine which of Y0–Y7 is activated when LE is low and strobes permit. |
| 4 | LE | Latch enable, active-low - Latches current A2–A0 state when high; enables real-time decoding when low. |
| 5 | G1 | Strobe input 1, active-low - Disables all outputs (forces low) when asserted; used for hierarchical enable chaining. |
| 6 | G0 | Strobe input 0, active-high - Disables all outputs when deasserted (low); complements G1 for flexible gating logic. |
| 7, 9–15 | Y7–Y0 | Active-high decoded outputs - Only one output is high per valid address; all others remain low unless strobed. |
| 8 | GND | Ground reference - Must be low-impedance connection to minimize switching noise coupling. |
| 16 | VCC | Positive supply - Requires local 0.1 µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables reliable decoding of slow or noisy address signals (e.g., from mechanical switches or long cables) without external hysteresis circuitry. |
| Latched address inputs | Allows asynchronous address hold during bus contention or controller interrupt latency, preserving output state across CPU cycles. |
| Dual strobe control (G0/G1) | Supports cascaded decoding architectures and demultiplexing modes - e.g., use G0 as data input while A2–A0 select channel. |
| Ultra-low ICC | Reduces system standby power in always-on applications such as sensor hubs or watchdog controllers where continuous decoding is required. |
| Industrial temperature range | Eliminates need for derating or thermal monitoring in harsh environments like factory automation or outdoor infrastructure. |
Applications
| Memory Address Decoding | Chip Select Logic for Flash/EEPROM |
|---|---|
Use Scenario: Microcontroller with limited GPIO routes address bits to multiple memory devices sharing a common data bus. IC Role / Device Role / Timing Role: SN74HCS237DR decodes 3-bit address to assert individual chip select (CS) lines, enabling read/write access to one memory IC at a time. Use Value: Reduces required MCU pins from 8 dedicated CS lines to just 3 address + 2 strobe lines, simplifying BOM and layout. | Use Scenario: Industrial PLC uses external SPI or parallel EEPROM for configuration storage, requiring selective activation among multiple non-volatile devices. IC Role / Device Role / Timing Role: SN74HCS237DR acts as a programmable chip select arbiter, isolating EEPROM banks during firmware updates to prevent corruption. Use Value: Prevents simultaneous write conflicts and ensures atomic sector programming via hardware-enforced mutual exclusion. |
| Peripheral Multiplexing | Legacy Bus Interface Expansion |
Use Scenario: Embedded gateway connects legacy UART peripherals (modems, sensors) over shared RS-232/485 lines using discrete enable control. IC Role / Device Role / Timing Role: SN74HCS237DR routes transmit/receive enables to up to eight UART transceivers based on host command. Use Value: Eliminates software polling delays by providing deterministic, hardware-level peripheral arbitration with sub-20 ns latency. | Use Scenario: Retro-computing project interfaces modern microcontroller to vintage ISA-style expansion slots requiring 8-channel device selection. IC Role / Device Role / Timing Role: SN74HCS237DR replaces obsolete 74LS237 in ISA address decode logic, supporting 5 V tolerant operation and noise immunity. Use Value: Maintains functional equivalence while improving reliability in electrically noisy retro-systems with unshielded cabling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder with latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS137DR | Same family, but lacks address latches; LE input absent - only combinational decoding. | Cannot hold address state during bus contention; unsuitable for systems requiring asynchronous latch behavior. | Select SN74HCS137DR only if real-time address tracking suffices and latch functionality is unnecessary. |
| 74LVC138AD,118 | 3.3 V only (1.65–3.6 V), no Schmitt triggers, higher ICC (~1 µA typ), no latch enable. | Requires clean, fast-rising address signals; incompatible with 5 V systems or noisy industrial environments. | Choose 74LVC138AD,118 for cost-sensitive 3.3 V-only designs where noise immunity and wide VCC are not required. |
Compared with SN74HCS137DR and 74LVC138AD,118, the SN74HCS237DR uniquely combines latch capability, Schmitt-trigger noise rejection, and 2–6 V operation - making it the only option for robust, voltage-flexible, asynchronous address decoding in industrial edge nodes.
Availability
SN74HCS237DR is available at Aetrix Electronics and suitable for memory address decoding, chip select logic for Flash/EEPROM, peripheral multiplexing, and legacy bus interface expansion requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74HCS237DR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.
The SN74HCS237DR belongs to TI's HCS logic family - designed specifically for low-power, high-noise-immunity applications in industrial automation, automotive subsystems, and IoT edge nodes where reliability under electrical stress is critical.
FAQ
What is the function of the LE pin on the SN74HCS237DR?
The LE (Latch Enable) pin on the SN74HCS237DR is an active-low control that determines whether the device operates in transparent decoding mode or latched mode. When LE is low, the SN74HCS237DR decodes A2–A0 in real time; when LE is high, it holds the last valid address state, maintaining output stability despite changes on the address bus. This behavior is confirmed in the Function Table (Table 8-1) and Section 8.4 of the datasheet.
Does the SN74HCS237DR support 5 V operation?
Yes, the SN74HCS237DR fully supports 5 V operation within its recommended supply range of 2 V to 6 V. At VCC = 5 V, it delivers ±6 mA output drive (per Electrical Characteristics Table 6.5), maintains input hysteresis of 0.4–1.4 V, and meets all timing specifications including tpd ≤ 7 ns (typical). This makes the SN74HCS237DR compatible with legacy 5 V TTL/CMOS systems without level translation.
How do the G0 and G1 strobe inputs interact on the SN74HCS237DR?
On the SN74HCS237DR, G0 is active-high and G1 is active-low; either strobe being asserted disables all outputs (Y0–Y7 forced low). Both must be simultaneously valid (G0 = high, G1 = low) for normal decoded operation. This dual-strobe architecture allows flexible hierarchical enable schemes - for example, G1 can serve as a global disable while G0 selects sub-groups, enabling scalable multi-level decoding trees without additional logic gates.
Can unused inputs on the SN74HCS237DR be left floating?
No, unused inputs on the SN74HCS237DR must not be left floating. Per Section 9.2.1.2 and Layout Guidelines (Section 11.1), all unused inputs - including A2, A1, A0, LE, G0, and G1 - must be tied to a defined logic level (VCC or GND) using direct connection or pull-up/pull-down resistors (e.g., 10 kΩ). Floating inputs cause undefined internal states, increased ICC, and potential oscillation due to Schmitt-trigger sensitivity to intermediate voltages.
What is the maximum capacitive load the SN74HCS237DR can drive while meeting datasheet timing specs?
The SN74HCS237DR is characterized for CL = 50 pF in all timing specifications (Sections 6.6 and 6.7), and the datasheet explicitly recommends keeping total output load capacitance ≤ 50 pF for guaranteed compliance with propagation delay (tpd), setup/hold, and transition time (tt) limits. Exceeding 50 pF increases propagation delay nonlinearly and may cause signal integrity issues - especially at 6 V operation where edge rates are fastest. For heavier loads, buffer stages or series termination should be added.
SN74HCS237DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74HCS237DR FAQ
1.How can I place an order for SN74HCS237DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS237DR 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 SN74HCS237DR reliable?
The price and inventory of SN74HCS237DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS237DR is usually 5 days.
3.What payment methods are accepted for SN74HCS237DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCS237DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCS237DR?
SN74HCS237DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS237DR 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 SN74HCS237DR?
For technical support, including SN74HCS237DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS237DR requirements.
6.How does Aetrix verify that SN74HCS237DR is sourced from the original manufacturer or authorized distributors?
All SN74HCS237DR 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 SN74HCS237DR meets industry standards.
7.What is the process for return or replacement of SN74HCS237DR?
All SN74HCS237DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS237DR, 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 SN74HCS237DR part is unused and in its original packaging.
Return procedure for SN74HCS237DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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