My Inquiry
My Account
NXP Semiconductors N74F545N,602
- Part No.:
- N74F545N,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
N74F545N,602.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,084
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
N74F545N,602 from Philips Semiconductors is an octal bidirectional transceiver with 3-State inputs/outputs, designed for bus-oriented microprocessor and digital communication systems. It features 8-bit bidirectional data flow, 24mA drive on Port A, 64mA drive on Port B, and a typical propagation delay of 4.0ns at 5V. Used in legacy industrial control backplanes and memory expansion interfaces.
For engineers reviewing the N74F545N,602 datasheet, N74F545N,602 pinout, N74F545N,602 application, or N74F545N,602 equivalent, key selection criteria include directional control via T/R input, independent 3-State enable (OE), asymmetric bus drive capability per port, and compatibility with 5V TTL logic families in commercial-temperature systems.
Technical Context
The N74F545N,602 implements a straight-through bidirectional transceiver architecture with separate Transmit/Receive (T/R) and Output Enable (OE) control lines. Directionality is determined solely by T/R: Low enables A→B data flow; High enables B→A. OE is active-low and places both ports into high-impedance state when asserted.
Port A outputs deliver 24mA sink current and support 3.0mA source current; Port B outputs deliver 64mA sink current and support 15mA source current. Input loading is specified as 70µA in both logic states across all data and control pins, enabling low-impact interfacing with upstream drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - operates reliably within standard 5V ±10% TTL supply rails |
| Propagation Delay | 4.0ns typical - ensures sub-5ns timing margin for high-speed 5V bus transfers | Port A Drive | 24mA sink / 3.0mA source - sufficient for driving 15–20 TTL loads on local bus segments |
| Port B Drive | 64mA sink / 15mA source - supports heavier loading on system-wide data buses |
| Input Current | ±40µA max at control pins (OE, T/R) - minimizes loading on address/control bus drivers |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded and industrial control applications |
| Output Disable Time | 2.5–7.5ns - enables fast bus arbitration and multi-master contention resolution |
Pinout & Package
Package: 20-pin plastic DIP (SOT146-1), 300-mil width, through-hole mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A2 | Port A bidirectional data line 2 - connects to local subsystem data bus |
| 2 | A3 | Port A bidirectional data line 3 - shares same direction control and 3-State behavior as A0–A7 |
| 3 | A7 | Port A bidirectional data line 7 - highest-order bit of Port A interface |
| 4 | A5 | Port A bidirectional data line 5 - part of 8-bit parallel path between local and system buses |
| 5 | A4 | Port A bidirectional data line 4 - matches pin assignment of 74F245 but differs in physical layout |
| 6 | A1 | Port A bidirectional data line 1 - used for byte-wide data transfer in memory-mapped I/O |
| 7 | A0 | Port A bidirectional data line 0 - LSB of Port A, commonly tied to data bus D0 |
| 8 | GND | Ground reference - pin 10 is also GND; dual ground pins reduce ground bounce |
| 9 | OE | Active-low output enable - disables both ports simultaneously into high-impedance state |
| 10 | GND | Ground reference - second ground pin improves noise immunity and current return path |
| 11 | T/R | Transmit/Receive control - Low = A→B; High = B→A; determines real-time data direction |
| 12 | A6 | Port A bidirectional data line 6 - supports full 8-bit parallel transfer without multiplexing |
| 13 | B7 | Port B bidirectional data line 7 - connects to main system data bus or memory bus |
| 14 | B6 | Port B bidirectional data line 6 - higher drive strength than corresponding A-line |
| 15 | B5 | Port B bidirectional data line 5 - rated for 64mA sink, suitable for longer trace runs |
| 16 | B4 | Port B bidirectional data line 4 - supports robust signal integrity on shared bus segments |
| 17 | B1 | Port B bidirectional data line 1 - used in legacy ISA-style expansion interfaces |
| 18 | B0 | Port B bidirectional data line 0 - LSB of Port B, typically connected to system bus D0 |
| 19 | B3 | Port B bidirectional data line 3 - benefits from higher drive capability vs. A-side counterparts |
| 20 | VCC | +5V supply - decoupling capacitor required adjacent to pin for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric bus drive capability | Port A (24mA sink) for local subsystems; Port B (64mA sink) for system-level buses - optimizes power and signal integrity per domain |
| Dedicated directional control (T/R) | Single-pin bidirectional flow selection eliminates need for external logic or multiplexers in bus arbitration |
| Low-input-current NPN-base inputs | 70µA max loading on all data and control pins - reduces fan-out burden on upstream drivers |
| Independent 3-State enable (OE) | Active-low OE disables both ports simultaneously - simplifies bus isolation during DMA or interrupt handling |
| Sub-5ns propagation delay | 4.0ns typical at 5V - meets timing requirements for 20+ MHz 5V TTL bus clocking |
Applications
| ISA Bus Expansion Interface | Legacy Memory-Mapped I/O Bridge |
|---|---|
|
Use Scenario: Interfacing 8-bit peripheral controllers (e.g., UARTs, timers) to ISA-compatible motherboard data bus. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing byte-wide transfers between local peripheral bus and 16-bit ISA data bus. Use Value: Enables seamless integration using only one IC per peripheral slot, leveraging asymmetric drive to match ISA bus loading requirements. |
Use Scenario: Connecting microcontroller-based sensor modules to legacy industrial PLC backplanes with memory-mapped addressing. IC Role / Device Role / Timing Role: Translates between microcontroller's internal 8-bit data bus and external 8-bit memory-mapped I/O space. Use Value: Provides deterministic 4.0ns latency and 3-State isolation during address decode cycles, preventing bus contention. |
| Microprocessor System Bus Isolation | Digital Communication Protocol Translator |
|
Use Scenario: Isolating Z80 or 8085 CPU data bus from peripheral expansion bus in retro-computing or test equipment designs. IC Role / Device Role / Timing Role: Controlled-direction transceiver enabling CPU-initiated read/write cycles while blocking spurious signals. Use Value: OE and T/R pins allow precise cycle-by-cycle control, supporting wait-state insertion and bus grant protocols. |
Use Scenario: Converting between two independent 8-bit synchronous data streams in protocol-conversion gateways (e.g., Modbus RTU to custom serial framing). IC Role / Device Role / Timing Role: Bidirectional buffer synchronizing data flow between clock domains with independent enable control. Use Value: 24mA/64mA drive supports mixed-voltage signaling and long cable runs without external repeaters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Identical electrical specs and function; differs only in pin assignment (e.g., A6/B6 positions swapped) | Requires PCB layout revision due to non-identical pinout - not drop-in compatible | Select SN74F245N only when redesigning board layout or sourcing from TI-distributed stock |
| 74ACT541PC | CMOS version with 5V-tolerant inputs, lower ICC (20mA typ), but reduced sink drive (24mA on both ports) | Better noise immunity and lower power, but insufficient for 64mA B-port loads in legacy bus systems | Choose 74ACT541PC only for new low-power designs where B-port loading ≤24mA |
Compared with SN74F245N and 74ACT541PC, the N74F545N,602 uniquely delivers asymmetric 24mA/64mA drive in a single 20-pin DIP package, making it irreplaceable in legacy systems requiring high-drive B-port capability without layout change.
Availability
N74F545N,602 is available at Aetrix Electronics and suitable for ISA bus expansion interfaces, legacy memory-mapped I/O bridges, and microprocessor system bus isolation requiring stable component supply and long-term obsolescence management.
Supply support for N74F545N,602 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
Philips Semiconductors (now NXP Semiconductors) is a pioneer in TTL and advanced logic ICs, delivering high-reliability components for industrial, computing, and communications infrastructure since the 1970s.
The 74F logic family-including the N74F545N,602-was engineered for high-speed 5V TTL systems requiring sub-5ns propagation, robust bus drive, and precise 3-State control in commercial-temperature environments.
FAQ
What is the maximum sink current rating for Port B outputs on the N74F545N,602?
The N74F545N,602 specifies a maximum sink current of 64mA per Port B output (B0–B7) under recommended operating conditions. This value is confirmed in the DC Electrical Characteristics table for IOL (Low-level output current) with B0–B7 at VCC = 4.5V and VIH = 2.0V. Exceeding this limit risks thermal overstress and parametric shift.
Does the N74F545N,602 support 3.3V logic interfacing?
No, the N74F545N,602 is a 5V-only TTL device with absolute maximum input voltage of +7.0V and recommended VIH of 2.0V. Its inputs are not 3.3V-tolerant, and operation below VCC = 4.5V violates recommended conditions. For 3.3V systems, level-shifting circuitry or a 3.3V-compatible transceiver such as 74LVC245 must be used alongside the N74F545N,602.
How does the T/R pin control data direction in the N74F545N,602?
In the N74F545N,602, the T/R pin is a dedicated directional control input: when T/R = Low, data flows from Port A to Port B; when T/R = High, data flows from Port B to Port A. This direct mapping eliminates need for external decoding logic and enables real-time bus reversal in protocols like IEEE-488 or custom backplane handshaking.
Is the N74F545N,602 pin-compatible with the SN74F245N?
No, the N74F545N,602 is not pin-compatible with the SN74F245N. Although both perform identical logic functions and share identical DC/AC specifications, Philips' datasheet explicitly states "the only difference being package pin assignment." Pin positions for A6, B6, and several other signals differ, requiring PCB layout modification for substitution.
What is the typical supply current consumption of the N74F545N,602?
The N74F545N,602 has a typical total supply current (ICC) of 87mA at VCC = 5V and Tamb = 25°C, as stated in the Product Specification front page. Under worst-case operating conditions (VCC = 5.5V, all outputs switching), ICC may reach 120mA per the ICCL specification, requiring appropriate decoupling and thermal design.
N74F545N,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
N74F545N,602 FAQ
1.How can I place an order for N74F545N,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F545N,602 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 N74F545N,602 reliable?
The price and inventory of N74F545N,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F545N,602 is usually 5 days.
3.What payment methods are accepted for N74F545N,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F545N,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F545N,602?
N74F545N,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F545N,602 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 N74F545N,602?
For technical support, including N74F545N,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F545N,602 requirements.
6.How does Aetrix verify that N74F545N,602 is sourced from the original manufacturer or authorized distributors?
All N74F545N,602 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 N74F545N,602 meets industry standards.
7.What is the process for return or replacement of N74F545N,602?
All N74F545N,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F545N,602, 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 N74F545N,602 part is unused and in its original packaging.
Return procedure for N74F545N,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
N74F545N,602 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
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…
