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Renesas R8A66154SP#T1
- Part No.:
- R8A66154SP#T1
- Manufacturer:
- Renesas
- Category:
- I/O Expanders
- Package:
- -
- Datasheet:
-
R8A66154SP#T1.pdf
- Description:
- 8-BIT I/O EXPANDER
- Quantity:
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Inventory:965
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Product details
Overview
R8A66154SP#T1 from Renesas Electronics is an 8-bit bi-directional I/O expander with integrated LED drive capability, implementing independent serial-in/parallel-out and parallel-in/serial-out shift registers for simultaneous data conversion. It features Schmitt-trigger inputs (DI, CLK, /S, /CS), N-channel open-drain outputs (D1–D8), 24 mA sink current at 4.5 V, and operates across 2.0–6.0 V supply and –40 to +85 °C ambient. It serves as MCU port extender and anode-common LED driver in compact display interfaces.
For engineers reviewing the R8A66154SP#T1 datasheet, R8A66154SP#T1 pinout, R8A66154SP#T1 application, or R8A66154SP#T1 equivalent, key selection criteria include its dual-shift-register architecture, per-pin I/O direction control via serial input, high-current open-drain outputs, wide VCC range, and SOP-16 packaging suitable for space-constrained industrial HMI and LED matrix systems.
Technical Context
The R8A66154SP#T1 integrates two independent CMOS shift registers: Shift Register 1 handles parallel-in/serial-out (PISO) output latching on /CS falling edge, while Shift Register 2 performs serial-in/parallel-out (SIPO) loading on DI during active /CS low. Serial data transfer occurs synchronously to CLK edges - positive edge for DI sampling, negative edge for DO output.
Pin direction (input/output) for D1–D8 is configured dynamically via serial input bits written to Shift Register 2; "H" sets input mode (requiring external pull-up), "L" enables output mode. The /S pin forces all I/O pins and DO into high-impedance state, enabling safe bus sharing and power-down control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V MCUs without level-shifting. |
| Output Sink Current (per pin) | 24 mA at VCC = 4.5 V - drives standard LEDs directly in anode-common configuration without external transistors. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control and display applications. |
| Max Clock Frequency | 1.9 MHz - enables fast serial data throughput for real-time I/O expansion up to ~1.5 Mbps. |
| Input Thresholds | Schmitt-trigger inputs (VT+ = 0.35×VCC, VT− = 0.20×VCC) - provide noise immunity in electrically noisy industrial environments. |
| Propagation Delay | 400 ns (CLK→DO, /CS→D1–D8) - ensures deterministic timing for synchronous MCU firmware coordination. |
| Package | 16-pin SOP (PRSP0016DJ-A) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
Package: 16-pin Small Outline Package (SOP), body width 7.5 mm, lead pitch 1.27 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, 8) | Ground reference | Dual ground pins reduce ground bounce and improve noise margin in high-speed serial operation. |
| DO (Pin 2) | Serial data output | Open-drain output synchronized to CLK negative edge; high-impedance after 8-bit transfer. |
| DI (Pin 3) | Serial data input | Schmitt-trigger input sampled on CLK positive edge; masked after 8 bits received. |
| CLK (Pin 4) | Serial clock input | Schmitt-trigger clock with 260 ns minimum pulse width; controls both PISO and SIPO timing. |
| /CS (Pin 5) | Chip select (active-low) | Falling edge latches parallel data into PISO register; rising edge outputs SIPO data to D1–D8. |
| VCC (Pin 6) | Positive supply | Single supply powers logic core and output drivers; supports 2.0–6.0 V operation. |
| /S (Pin 7) | Set (active-low reset) | Forces DO and D1–D8 into high-impedance - enables safe multi-device bus arbitration and power sequencing. |
| D1–D8 (Pins 9–16) | Parallel I/O terminals | N-ch open-drain outputs; direction set per pin via serial input bit - enables mixed-mode I/O on single bus. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shift registers | Enables concurrent serial data reception (via DI) and transmission (via DO), eliminating I/O bottlenecks in full-duplex MCU communication. |
| Per-pin I/O direction control | Each D1–D8 pin's mode (input/output) is individually configurable via serial command - no fixed port direction registers required. |
| Anode-common LED drive support | 24 mA sink per pin at 4.5 V allows direct driving of common-anode 7-segment or dot-matrix displays without external drivers. |
| Schmitt-trigger inputs | Input hysteresis (≥15% VCC) rejects EMI and contact bounce in industrial pushbutton or switch interfaces. |
| High-impedance enable (/S) | Hardware-controlled tri-state activation simplifies shared-bus designs and eliminates need for software-driven output disable sequences. |
Applications
| Industrial HMI Keypad Interface | LED Matrix Display Controller |
|---|---|
Use Scenario: A microcontroller with limited GPIO connects to a 4×4 mechanical keypad and status LEDs on a factory control panel. IC Role / Device Role / Timing Role: R8A66154SP#T1 acts as bidirectional I/O expander: reads keypad rows/columns via D1–D8 in input mode and drives status LEDs in output mode, synchronized by /CS and CLK. Use Value: Reduces MCU GPIO usage from 16 to 4 lines (DI, DO, CLK, /CS), while supporting simultaneous key scan and LED update without firmware overhead. |
Use Scenario: Driving a 8×8 common-anode LED dot-matrix display in a programmable logic controller status indicator. IC Role / Device Role / Timing Role: R8A66154SP#T1 serves as column driver - D1–D8 sink current for 8 columns, while row selection is handled externally; /S enables blanking between frames. Use Value: Delivers 24 mA per column at 5 V, enabling bright, uniform LED illumination without external FETs or current-limiting resistors on the sink side. |
| Legacy Bus Signal Translation | Modular Sensor Node Expansion |
Use Scenario: Interfacing a modern 3.3 V MCU to legacy 5 V parallel peripherals (e.g., ADCs, DACs) using level-tolerant serial control. IC Role / Device Role / Timing Role: R8A66154SP#T1 functions as voltage-agile I/O bridge: accepts 3.3 V serial commands and outputs 5 V-compatible logic levels (via VCC = 5 V) to D1–D8. Use Value: Eliminates discrete level shifters; Schmitt inputs tolerate slow-rising 5 V signals, and open-drain outputs interface cleanly with 5 V pull-ups. |
Use Scenario: Adding analog sensor inputs and digital actuator outputs to a wireless sensor node with constrained PCB area. IC Role / Device Role / Timing Role: R8A66154SP#T1 extends MCU I/O for connecting thermistor dividers (D1–D4 as ADC inputs) and relay drivers (D5–D8 as open-drain switches). Use Value: Enables mixed-signal expansion using only 4 serial lines; /S pin allows safe power cycling of sensor subsystems without affecting MCU operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expander with LED drive applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5916IPW | Dedicated constant-current LED sink driver (16-channel, 120 mA max), no bidirectional I/O or shift-register flexibility. | Optimized for high-brightness LED signage; lacks general-purpose GPIO expansion capability. | Choose TLC5916IPW when precise LED current control and higher channel count outweigh need for mixed-mode I/O. |
| MAX7317ATG+ | I²C-interface 16-bit I/O expander with interrupt output and programmable pull-ups; no native LED drive current rating. | Better suited for complex multi-peripheral systems requiring addressable I²C topology and event-driven wake-up. | Choose MAX7317ATG+ when system already uses I²C infrastructure and requires interrupt-based input monitoring over raw serial bandwidth. |
Compared with TLC5916IPW and MAX7317ATG+, the R8A66154SP#T1 uniquely combines serial-bus simplicity, per-pin I/O configurability, and 24 mA LED sink capability in a single 16-pin SOP - making it optimal for cost-sensitive, space-constrained designs needing both general-purpose expansion and direct LED interfacing.
Availability
R8A66154SP#T1 is available at Aetrix Electronics and suitable for industrial HMI, LED display modules, and legacy bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for R8A66154SP#T1 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT applications.
The R8A66154SP#T1 belongs to Renesas' legacy 8-bit peripheral interface IC family, designed specifically for MCU port expansion and LED-centric human-machine interfaces in industrial control equipment.
FAQ
What is the maximum sink current per output pin on the R8A66154SP#T1?
The R8A66154SP#T1 provides 24 mA sink current per D1–D8 pin at VCC = 4.5 V, 15 mA at VCC = 3.0 V, and 8 mA at VCC = 2.0 V. These values are guaranteed under specified test conditions in the REJ03F0285-0100 datasheet and reflect actual drive capability for common-anode LED segments or logic-level switching loads.
Does the R8A66154SP#T1 support true bidirectional serial communication?
Yes, the R8A66154SP#T1 supports concurrent bidirectional serial operation: while DO outputs latched parallel data on CLK negative edges, DI simultaneously samples incoming serial data on CLK positive edges - enabled by its two independent shift registers, as confirmed in the functional description and timing diagrams of the R8A66154SP#T1 datasheet.
How is I/O direction configured for pins D1 through D8 on the R8A66154SP#T1?
I/O direction for each of D1–D8 on the R8A66154SP#T1 is set individually via serial input bits written to Shift Register 2: a "H" bit configures the corresponding pin as high-impedance input (requiring external pull-up), while a "L" bit enables it as N-channel open-drain output - a feature explicitly defined in the DESCRIPTION and OPERATION sections of the R8A66154SP#T1 datasheet.
What package type is used for the R8A66154SP#T1?
The R8A66154SP#T1 uses a 16-pin Small Outline Package (SOP) with Renesas code PRSP0016DJ-A and previous code 16P2X-E. This surface-mount package has 1.27 mm lead pitch, 7.5 mm body width, and complies with JEDEC MS-012 standards, as documented in the PACKAGE OUTLINE section of the R8A66154SP#T1 datasheet.
Can the R8A66154SP#T1 operate from a 3.3 V supply?
Yes, the R8A66154SP#T1 supports 3.3 V operation within its specified 2.0–6.0 V supply range. At VCC = 3.3 V, it delivers 15 mA sink current per output pin and maintains full functionality including Schmitt-trigger inputs, 1.9 MHz max clock rate, and –40 to +85 °C operation - all verified in the RECOMMENDED OPERATING CONDITIONS and ELECTRICAL CHARACTERISTICS tables for R8A66154SP#T1.
R8A66154SP#T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- -
- Interface:
- -
- Interrupt Output:
- -
- Features:
- -
- Output Type:
- -
- Current - Output Source/Sink:
- -
- Clock Frequency:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
R8A66154SP#T1 FAQ
1.How can I place an order for R8A66154SP#T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R8A66154SP#T1 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 R8A66154SP#T1 reliable?
The price and inventory of R8A66154SP#T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R8A66154SP#T1 is usually 5 days.
3.What payment methods are accepted for R8A66154SP#T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R8A66154SP#T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R8A66154SP#T1?
R8A66154SP#T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R8A66154SP#T1 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 R8A66154SP#T1?
For technical support, including R8A66154SP#T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R8A66154SP#T1 requirements.
6.How does Aetrix verify that R8A66154SP#T1 is sourced from the original manufacturer or authorized distributors?
All R8A66154SP#T1 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 R8A66154SP#T1 meets industry standards.
7.What is the process for return or replacement of R8A66154SP#T1?
All R8A66154SP#T1 units undergo pre-shipment inspection (PSI). If there is an issue with R8A66154SP#T1, 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 R8A66154SP#T1 part is unused and in its original packaging.
Return procedure for R8A66154SP#T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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