My Inquiry
My Account
Texas Instruments CY74FCT157CTSOCT
- Part No.:
- CY74FCT157CTSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT157CTSOCT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY74FCT157CTSOCT from Texas Instruments is a quad 2-input multiplexer with 3-state outputs, designed for data routing in TTL- and CMOS-compatible digital systems. It features 4.3 ns propagation delay (max), ±32 mA output drive capability, and operates over –40°C to +85°C. Used in bus multiplexing, function generation, and register-to-bus data selection in industrial control and instrumentation.
For engineers reviewing the CY74FCT157CTSOCT datasheet, CY74FCT157CTSOCT pinout, CY74FCT157CTSOCT application, or CY74FCT157CTSOCT equivalent, key selection criteria include 3-state output timing, Ioff-enabled partial-power-down support, matched rise/fall times, and SOIC-16 package compatibility with legacy FCT logic families.
Technical Context
The CY74FCT157CTSOCT implements four independent 2:1 multiplexers sharing one common select (S) and active-low enable (E) input. Each Y output reflects either I0x or I1x based on S state when E is low; all outputs go high-impedance when E is high.
It uses FCT-family silicon with edge-rate control circuitry to reduce switching noise, supports TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max), and includes Ioff protection enabling safe operation during partial power-down - critical for hot-swap and mixed-voltage system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 4.3 ns max - ensures tight timing budget compliance in 25 MHz+ synchronous bus systems |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs without buffering |
| Supply Voltage (VCC) | 4.75–5.25 V - tightly regulated 5 V operation compatible with legacy TTL supply rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and control applications |
| Ioff Current | ±1 µA at VCC = 0 V - prevents backflow current during partial power-down, protecting powered subsystems |
| Input Thresholds | VIH = 2 V min, VIL = 0.8 V max - fully interoperable with standard TTL logic levels |
| 3-State Enable Time (tPZL/tPHZ) | 4.8 ns max - enables fast bus arbitration and dynamic signal routing |
Pinout & Package
Package: SOIC-16 (DW), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-low output enable | Drives all Y outputs into high-impedance when high; enables concurrent bus sharing |
| 2 (I0a), 3 (I1a), 4 (Ya) | Data inputs and noninverted output (channel A) | Routes selected bit from two sources to shared bus; Ya = I0a if S = L, else I1a |
| 5 (I0b), 6 (I1b), 7 (Yb) | Data inputs and noninverted output (channel B) | Independent 2:1 path synchronized to same S and E controls |
| 8 (GND) | Ground reference | Common return for logic and output current paths; decoupling capacitor placement critical |
| 9 (VCC) | Power supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass near pin |
| 10 (S) | Common data-select input | Single control line determines source selection across all four channels |
| 11 (I0c), 12 (I1c), 13 (Yc) | Data inputs and noninverted output (channel C) | Third identical multiplexer channel, electrically isolated but logically synchronized |
| 14 (I0d), 15 (I1d), 16 (Yd) | Data inputs and noninverted output (channel D) | Fourth channel completing quad configuration; supports full 4-bit word routing |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dv/dt - improves signal integrity in dense PCB layouts |
| Ioff partial-power-down support | Enables safe isolation of unpowered sections in multi-rail systems without external isolation circuitry |
| Matched rise/fall times | Minimizes duty cycle distortion on routed clock or data signals - critical for timing-sensitive applications |
| TTL-compatible input thresholds | Eliminates need for level-shifting when interfacing with legacy 5 V microcontrollers, FPGAs, or ASICs |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC standards for robust handling in manufacturing and field environments |
Applications
| Industrial PLC I/O Multiplexing | Legacy Bus Arbitration |
|---|---|
Use Scenario: Routing sensor data from dual analog input banks to a single ADC interface in programmable logic controllers. IC Role / Device Role / Timing Role: Quad 2:1 selector synchronizing four parallel channels under shared S/E control to minimize control lines. Use Value: Reduces PCB trace count and FPGA I/O usage while maintaining deterministic 4.3 ns routing latency per channel. | Use Scenario: Arbitrating between two memory-mapped peripheral buses sharing one processor data bus in retro-computing hardware. IC Role / Device Role / Timing Role: Bidirectional data path selector enabling time-division access without bus contention. Use Value: 3-state outputs prevent signal collisions; Ioff protects peripherals during processor reset sequences. |
| Function Generator Logic | Register File Data Path |
Use Scenario: Implementing arbitrary 2-variable Boolean functions (e.g., XOR, NAND, implication) in glue logic for FPGA configuration state machines. IC Role / Device Role / Timing Role: Configurable logic block using S as function selector and I0/I1 as variable inputs. Use Value: Generates any 4 of 16 possible 2-input truth tables - replaces discrete gates with predictable 4.3 ns propagation. | Use Scenario: Selecting between primary and shadow register sets during context switching in real-time embedded controllers. IC Role / Device Role / Timing Role: High-speed data path switch moving 4-bit register contents to ALU inputs under clock-synchronized control. Use Value: 64 mA sink drive ensures clean transitions into ALU inputs even with 50 pF load; matched edges preserve setup/hold margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT157CTSOCT | Same pinout, identical timing and drive specs; TI rebranded part number with identical DW package and marking | No functional difference; used interchangeably in new designs and legacy BOMs | Select when sourcing from distributors listing SN74 prefix; identical qualification and reliability data |
| 74AC157M | Higher speed (tPD = 3.5 ns typ), lower drive (24 mA sink), wider VCC range (2–6 V), no Ioff support | Suitable for battery-powered or mixed-voltage systems but lacks partial-power-down safety | Choose only if 5 V-only operation and Ioff are not required; verify layout for increased SSN due to faster edges |
Compared with CY74FCT157CTSOCT, SN74FCT157CTSOCT offers drop-in replacement assurance with identical form-fit-function, while 74AC157M trades Ioff and noise control for broader voltage operation and marginal speed gain - requiring redesign validation for power sequencing and EMI.
Availability
CY74FCT157CTSOCT is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface modules, and register-file data-path designs requiring stable component supply, long-term lifecycle support, and guaranteed SOIC-16 packaging consistency.
Supply support for CY74FCT157CTSOCT 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, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial qualification.
The CY74FCT157CTSOCT belongs to the FCT logic family - engineered for noise-immune, high-drive 5 V TTL-compatible operation in mission-critical industrial and automotive-adjacent systems.
FAQ
What is the maximum propagation delay of the CY74FCT157CTSOCT at 5 V?
The CY74FCT157CTSOCT has a maximum propagation delay of 4.3 ns (tPLH/tPHL) under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to +85°C). This value applies to both I→Y and S→Y paths and is measured with CL = 50 pF load. The CY74FCT157CTSOCT meets this spec across its full industrial temperature range.
Does the CY74FCT157CTSOCT support partial power-down operation?
Yes, the CY74FCT157CTSOCT includes Ioff circuitry that disables outputs and limits current to ±1 µA when VCC = 0 V, preventing damaging backflow current during partial power-down. This feature is explicitly validated in the datasheet and allows safe integration into multi-rail systems where other components remain powered while the CY74FCT157CTSOCT is unpowered.
Is the CY74FCT157CTSOCT pin-compatible with older FCT-series multiplexers?
Yes, the CY74FCT157CTSOCT is function, pinout, and drive compatible with earlier FCT logic devices including CY74FCT157T and CY54FCT157T. Its SOIC-16 (DW) footprint matches standard 5 V FCT multiplexers, and electrical characteristics (VOH/VOL, VIH/VIL, drive strength) are maintained within FCT family specifications - enabling direct replacement in existing designs.
What is the output drive capability of the CY74FCT157CTSOCT?
The CY74FCT157CTSOCT provides 64 mA maximum sink current (IOL) and 32 mA maximum source current (IOH) per output, verified at VCC = 4.75–5.25 V and TA = –40°C to +85°C. This drive strength supports fanout to multiple TTL inputs or direct driving of moderate capacitive loads up to 50 pF without external buffers.
Can the CY74FCT157CTSOCT be used in systems with mixed 3.3 V and 5 V logic?
The CY74FCT157CTSOCT is a 5 V-only device (VCC = 4.75–5.25 V) with TTL-compatible inputs, so it accepts 3.3 V logic-high signals (VIH min = 2 V) safely. However, its outputs swing to ~3.3 V VOH (typ) and cannot directly drive 3.3 V–only inputs requiring >2.4 V VIH without verification. For robust mixed-voltage interfacing, level-shifting or buffer validation per application is recommended - the CY74FCT157CTSOCT itself does not support dual-supply operation.
CY74FCT157CTSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 32mA, 64mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CY74FCT157CTSOCT FAQ
1.How can I place an order for CY74FCT157CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT157CTSOCT 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 CY74FCT157CTSOCT reliable?
The price and inventory of CY74FCT157CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT157CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT157CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT157CTSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT157CTSOCT?
CY74FCT157CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT157CTSOCT 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 CY74FCT157CTSOCT?
For technical support, including CY74FCT157CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT157CTSOCT requirements.
6.How does Aetrix verify that CY74FCT157CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT157CTSOCT 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 CY74FCT157CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT157CTSOCT?
All CY74FCT157CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT157CTSOCT, 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 CY74FCT157CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT157CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY74FCT157CTSOCT Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
