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Texas Instruments CD54HC157F
- Part No.:
- CD54HC157F
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
CD54HC157F.pdf
- Description:
- CD54HC157 HIGH SPEED CMOS LOGIC
- Quantity:
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Inventory:4,806
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Product details
Overview
CD54HC157F from Texas Instruments is a military-grade quad 2-input non-inverting multiplexer in 16-lead CERDIP package, operating from 2V to 6V with -55°C to +125°C temperature range, 25mA output drive, and propagation delay of 21ns (typ) at 6V/CL=50pF - used for register-to-bus data routing in aerospace avionics and hardened control systems.
For engineers reviewing the CD54HC157F datasheet, CD54HC157F pinout, CD54HC157F application, or CD54HC157F equivalent, key selection criteria include its wide-temperature CMOS logic compatibility, active-low enable control, common select architecture, and guaranteed operation under extreme thermal stress without derating.
Technical Context
The CD54HC157F implements four independent 2:1 multiplexers sharing one common Select (S) input and one active-low Enable (E) input; each channel routes either I0 or I1 to Y based on S state when E is low. Its HC logic family ensures rail-to-rail voltage transfer, high noise immunity (NIL/NIH = 30% of VCC), and balanced tPLH/tPHL transition times.
It features buffered inputs and outputs, fanout capability of 10 LSTTL loads, and quiescent ICC ≤160µA over full temperature range. The device lacks internal latching or clocking - it is purely combinational, with all timing parameters defined relative to input edge transitions (tr/tf = 6ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with 2V–6V supply - enables direct interface with mixed-voltage systems without level shifters. |
| Operating Temperature | -55°C to +125°C - qualified for military/aerospace applications requiring unbuffered operation across extreme ambient conditions. |
| Propagation Delay | 21ns max at VCC = 6V, CL = 50pF - supports reliable 25MHz+ data switching in synchronous bus architectures. |
| Output Drive | ±25mA per output - sufficient to directly drive multiple LSTTL inputs or short PCB traces without external buffers. |
| Input Thresholds | VIH = 1.5V min (2V), 4.2V min (6V); VIL = 0.5V max (2V), 1.8V max (6V) - provides robust noise margin across full supply range. |
| Power Dissipation | CPD = 62pF - enables accurate dynamic power estimation via PD = VCC² × fi × (CPD + CL) for thermal design. |
| Enable Polarity | Active-low (E) - allows direct connection to system reset or chip-select lines without inverters. |
Pinout & Package
CD54HC157F is housed in a hermetically sealed 16-lead Ceramic Dual In-line Package (CERDIP), rated for high-reliability environments including space and defense platforms. The package features gold-plated leads, glass-sealed body, and MIL-STD-883 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E (Enable) | Active-low global enable - forces all Y outputs low when high; required for bus isolation during standby. |
| 2 | 1I0 | Data input 0 for channel 1 - connects to first source register or signal path. |
| 3 | 1I1 | Data input 1 for channel 1 - connects to second source register or alternate signal path. |
| 4 | 1Y | Non-inverting output for channel 1 - reflects selected input (I0 or I1) with no inversion. |
| 5 | 2I0 | Data input 0 for channel 2 - electrically isolated but functionally identical to 1I0. |
| 6 | 2I1 | Data input 1 for channel 2 - shares same select logic as other channels. |
| 7 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in multi-channel switching. |
| 8 | 2Y | Non-inverting output for channel 2 - synchronized with 1Y, 3Y, and 4Y under common S/E control. |
| 9 | VCC | Positive supply - requires local 0.1µF ceramic decoupling adjacent to pin for stable high-speed operation. |
| 10 | 4I0 | Data input 0 for channel 4 - completes quad configuration; pin order matches standard HC157 layout. |
| 11 | 4I1 | Data input 1 for channel 4 - supports simultaneous 4-bit data selection from dual sources. |
| 12 | 4Y | Non-inverting output for channel 4 - final output in quad set; routed to shared data bus or FPGA interface. |
| 13 | 3I0 | Data input 0 for channel 3 - maintains consistent pin mapping across all four channels. |
| 14 | 3I1 | Data input 1 for channel 3 - enables uniform PCB layout for replicated channel routing. |
| 15 | 3Y | Non-inverting output for channel 3 - provides third parallel output for 4-bit word transfer. |
| 16 | S (Select) | Common 2:1 selector - determines whether I0 or I1 is passed to all Y outputs simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 multiplexing with common control | Reduces component count by consolidating four independent 2:1 switches into single CERDIP IC - simplifies layout and improves inter-channel timing matching. |
| Wide 2V–6V supply range | Eliminates need for dedicated 5V rails in mixed-supply systems - interoperable with 3.3V microcontrollers and legacy 5V peripherals. |
| Guaranteed operation from -55°C to +125°C | Supports deployment in unheated avionics bays or engine-mounted controllers without thermal derating or external heaters. |
| High noise immunity (30% VCC) | Withstands >1.5V noise spikes on 5V systems - critical for reliable operation in electrically noisy aircraft or industrial motor drives. |
| Low quiescent current (≤160µA) | Enables use in battery-backed subsystems where standby power budget is constrained to sub-milliwatt levels. |
| Buffered inputs/outputs | Prevents loading effects between cascaded stages - maintains signal integrity when driving long traces or multiple downstream loads. |
Applications
| Avionics Data Bus Interface | Military Vehicle Control Unit |
|---|---|
Use Scenario: Routing sensor data from redundant analog-to-digital converter pairs to a central flight computer via shared 4-bit parallel bus. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary and backup ADC outputs under command of flight control software. Use Value: Enables real-time failover without bus interruption - all four channels switch synchronously on common S/E, preserving word alignment and timing coherence. |
Use Scenario: Selecting between two sets of vehicle telemetry registers (engine vs chassis) for transmission over MIL-STD-1553 data bus. IC Role / Device Role / Timing Role: Non-inverting data selector translating dual-register bank contents into unified 4-bit payload for bus controller interface. Use Value: Provides deterministic 21ns max propagation delay - ensures telemetry packet timing remains within MIL-STD-1553 response window constraints. |
| Spacecraft Onboard Computer | Nuclear Power Plant Safety Logic |
Use Scenario: Multiplexing radiation-hardened memory address lines between two independent processor cores accessing shared SRAM. IC Role / Device Role / Timing Role: Address bus selector enabling core-swapping without memory remapping or software intervention. Use Value: CERDIP packaging and -55°C to +125°C rating ensure uninterrupted operation in vacuum and thermal cycling environments aboard satellites. |
Use Scenario: Isolating diagnostic test signals from operational safety-critical I/O modules during periodic self-test sequences. IC Role / Device Role / Timing Role: Active-low enable-controlled gate preventing test signals from propagating to trip circuits unless E is asserted. Use Value: Guaranteed zero-output leakage (<±1µA) and fail-safe low-state outputs when disabled eliminate false triggering risks in Class 1E safety systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC157M | SOIC-16 plastic package, commercial/military temp (-55°C to +125°C), identical electrical specs - lower cost, non-hermetic. | Suitable for ground-based industrial controllers where radiation tolerance and vacuum sealing are not required. | Select CD74HC157M for cost-sensitive terrestrial designs with standard humidity and pressure environments. |
| CD54HCT157F3A | HCT variant: TTL-compatible inputs (VIH ≥ 2V, VIL ≤ 0.8V), 4.5V–5.5V only - no 2V–6V flexibility. | Required when interfacing directly with legacy LSTTL logic families without level translation. | Choose CD54HCT157F3A only when existing system uses strict 5V LSTTL signaling and cannot accommodate HC's wider VCC range. |
Compared with CD74HC157M and CD54HCT157F3A, the CD54HC157F uniquely combines hermetic CERDIP reliability, full 2V–6V operation, and military temperature qualification - making it irreplaceable in mission-critical airborne or spaceborne deployments where package integrity and voltage flexibility are non-negotiable.
Availability
CD54HC157F is available at Aetrix Electronics and suitable for avionics data routing, military vehicle control units, spacecraft onboard computers, and nuclear safety logic systems requiring stable component supply across extended lifecycle commitments.
Supply support for CD54HC157F 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The CD54HC157F belongs to TI's military-grade HC logic family, designed specifically for high-integrity digital signal routing in environments demanding extreme temperature resilience, radiation tolerance, and long-term supply stability.
FAQ
What is the maximum supply voltage rating for CD54HC157F?
The CD54HC157F has an absolute maximum DC supply voltage (VCC) of 7V, but its functional operating range is specified from 2V to 6V. Operation above 6V violates the recommended conditions and may cause excessive current draw or accelerated aging. For reliable long-term use in military systems, TI specifies 6V as the upper limit - the CD54HC157F must not be operated continuously at 7V even if within absolute maximum ratings.
Does CD54HC157F support 3.3V logic interfaces?
Yes, the CD54HC157F fully supports 3.3V operation: its HC logic family guarantees correct functionality at VCC = 3.3V, with VIH(min) = 2.0V and VIL(max) = 1.1V at that voltage - providing >1.2V noise margin. Input thresholds scale with VCC, so the CD54HC157F interfaces cleanly with 3.3V microcontrollers, FPGAs, and peripheral ICs without level shifters or pull-up resistors.
How does the enable pin (E) behave on CD54HC157F?
The CD54HC157F features an active-low enable input (pin 1). When E is high, all four Y outputs (1Y–4Y) are forced low regardless of S or input states - this is a hard-wired disable condition. When E is low, the device becomes operational and Y outputs reflect the selected I0/I1 inputs per the S signal. This behavior ensures safe default-off operation critical for fault-tolerant systems.
Is CD54HC157F pin-compatible with CD54HCT157F3A?
Yes, the CD54HC157F and CD54HCT157F3A share identical 16-pin CERDIP package footprints, pin assignments, and functional block diagrams - they are mechanically and logically interchangeable. However, their input threshold specifications differ: the CD54HC157F accepts 2V–6V supplies with CMOS-compatible inputs, while CD54HCT157F3A requires 4.5V–5.5V and accepts LSTTL input levels. Substitution requires verifying supply voltage and driver compatibility.
What is the typical power dissipation of CD54HC157F at 5V and 1MHz?
At VCC = 5V and input frequency fi = 1MHz, the CD54HC157F dissipates approximately 0.75mW per multiplexer stage. Using the formula PD = VCC² × fi × (CPD + CL), with CPD = 62pF and assuming CL = 15pF (typical PCB trace load), total dynamic power is ~0.75mW. Adding quiescent ICC ≈ 80µA yields <1mW total - well within CERDIP thermal limits for continuous operation in sealed enclosures.
CD54HC157F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD54HC157F FAQ
1.How can I place an order for CD54HC157F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC157F 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 CD54HC157F reliable?
The price and inventory of CD54HC157F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC157F is usually 5 days.
3.What payment methods are accepted for CD54HC157F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC157F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC157F?
CD54HC157F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC157F 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 CD54HC157F?
For technical support, including CD54HC157F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC157F requirements.
6.How does Aetrix verify that CD54HC157F is sourced from the original manufacturer or authorized distributors?
All CD54HC157F 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 CD54HC157F meets industry standards.
7.What is the process for return or replacement of CD54HC157F?
All CD54HC157F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC157F, 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 CD54HC157F part is unused and in its original packaging.
Return procedure for CD54HC157F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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