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Microchip Technology 93C56B-E/P
- Part No.:
- 93C56B-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
93C56B-E/P.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,103
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Product details
Overview
93C56B-E/P from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - deployed in automotive body control modules for calibration storage.
For engineers reviewing the 93C56B-E/P datasheet, 93C56B-E/P pinout, 93C56B-E/P application, or 93C56B-E/P equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), 2 ms write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire-based microcontrollers in space-constrained automotive PCBs.
Technical Context
The 93C56B-E/P implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external clock source beyond the host controller's CLK signal. Its instruction set includes READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all executed via 12-clock-cycle sequences for x16 mode, with status polling supported through DO pin high/low transitions.
Unlike C-variant parts, the 93C56B-E/P lacks an ORG pin (NC), permanently configuring memory as 128 × 16-bit. Erase/write initiation uses the rising edge of CLK on the final data bit, not CS falling edge - a timing distinction critical for deterministic firmware timing in safety-critical automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit organized as 128 words × 16 bits - supports direct mapping to 16-bit MCU data buses without software bit-packing. |
| VCC range | 4.5 V to 5.5 V - matches automotive 5 V rail tolerances; POR threshold at 3.8 V prevents spurious writes during brown-out. |
| Write cycle time | 2 ms max - enables deterministic firmware timeout handling; eliminates need for external watchdog supervision during programming. |
| Endurance | 1,000,000 erase/write cycles - sufficient for >10 years of daily recalibration updates in engine control units. |
| Data retention | 200 years at 25°C - exceeds automotive lifetime requirements; validated under JEDEC JESD22-A117 stress conditions. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® and dsPIC® MCUs without protocol translation logic. |
| Temp range | −40°C to +125°C (Automotive E-grade) - qualified per AEC-Q100 Grade 1; supports under-hood deployment. |
Pinout & Package
8-lead PDIP package (P suffix), 0.300" wide, Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 corner identified by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must remain low ≥250 ns between instructions; deselects device into standby but completes ongoing write. |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL minima ensure setup/hold compliance at 3 MHz. |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and data; tied high with pull-up in most automotive designs to prevent floating state. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low; requires external pull-up for status polling. |
| 5 VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling during write verification. |
| 6 NC | No Connection | Internally unconnected; left floating or tied to VSS per layout best practice to reduce EMI susceptibility. |
| 7 NC | No Connection | Same as Pin 6; dual NC pins provide mechanical symmetry and thermal relief in PDIP package. |
| 8 VCC | Power Supply | 4.5–5.5 V input; decoupling capacitor (100 nF X7R) required within 5 mm for stable write operation. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing circuitry or firmware delay loops; 2 ms max cycle ensures predictable interrupt latency. |
| Automatic ERAL before WRAL | Guarantees full-array erasure prior to bulk write - prevents partial-data corruption if WRAL is issued without prior ERAL. |
| Power-on/off data protection | Hardware-level lockout below 3.8 V VCC prevents inadvertent writes during power ramp-up/down - critical for ignition-switched systems. |
| Ready/Busy status on DO | Enables non-blocking polling instead of fixed delays; reduces CPU utilization by >90% vs. worst-case timeout waits. |
| 128 × 16-bit fixed organization | Optimizes storage efficiency for 16-bit sensor calibration tables; avoids software overhead of byte-to-word conversion in 8-bit systems. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Storing fuel injection timing maps and knock sensor calibration coefficients updated during dealer reprogramming. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 16-bit dsPIC33F MCU via Microwire peripheral. Use Value: 200-year retention ensures map integrity over vehicle lifetime; 1M endurance supports >500 dealership flash cycles. | Use Scenario: Retaining door lock actuator position offsets and window auto-reverse thresholds across battery disconnect events. IC Role / Device Role / Timing Role: Calibration storage element with fast 2 ms write enabling real-time learning during service mode. Use Value: −40°C to +125°C rating guarantees operation in trunk-mounted BCM; NC pins simplify routing in dense PCB layouts. |
| Instrument Cluster | Advanced Driver Assistance System (ADAS) |
Use Scenario: Saving odometer value and warning light history logs that survive ignition cycling and low-battery conditions. IC Role / Device Role / Timing Role: Tamper-resistant event logger using hardware write-protection (EWDS/EWEN) sequence. Use Value: Power-on protection at 3.8 V prevents odometer corruption during cranking voltage sag; 128×16 structure aligns with display controller word access. | Use Scenario: Holding camera lens focus calibration parameters updated during factory alignment and field recalibration. IC Role / Device Role / Timing Role: Secure parameter store accessed only during boot or maintenance mode via dedicated SPI-to-Microwire bridge. Use Value: Automotive-grade qualification (AEC-Q100) ensures reliability in vibration-prone mounting locations; 4.5–5.5 V range matches ADAS domain controller rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-I/P | 2.5–5.5 V VCC range; Industrial (−40°C to +85°C) grade only; same 128×16 organization and pinout. | Lacks automotive temperature qualification; unsuitable for under-hood or powertrain use. | Select when cost-sensitive industrial designs operate within 2.5–5.5 V and do not require AEC-Q100 compliance. |
| AT25128B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V, 128 Kbit capacity; no Ready/Busy pin - relies on WIP flag polling. | Higher density but incompatible protocol; requires MCU firmware rewrite and additional GPIO for chip select. | Choose only when migrating to SPI infrastructure and needing >2 Kbit capacity; not drop-in compatible. |
Compared with 93LC56B-I/P, the 93C56B-E/P provides guaranteed operation up to +125°C and tighter VCC minima for automotive robustness; versus AT25128B-MAHL-T, it retains Microwire compatibility and deterministic 2 ms write timing without SPI protocol overhead.
Availability
93C56B-E/P is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and body control modules requiring stable component supply across extended product lifecycles.
Supply support for 93C56B-E/P 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
Microchip Technology Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed specifically for cost-sensitive, space-constrained automotive and industrial systems requiring reliable nonvolatile storage with minimal external components and legacy Microwire interface support.
FAQ
What is the memory organization of the 93C56B-E/P?
The 93C56B-E/P has a fixed 128 × 16-bit organization (2 Kbit total), with no ORG pin - unlike C-variants, it does not support x8/x16 configuration. This structure delivers native 16-bit word access ideal for dsPIC® and other 16-bit microcontrollers used in automotive control applications.
Does the 93C56B-E/P require an external pull-up resistor on the DO pin?
Yes, the 93C56B-E/P DO pin requires an external pull-up resistor (typically 4.7 kΩ to VCC) to reliably detect Ready/Busy status during erase/write cycles. Without it, the High-Z output cannot be interpreted as logic high, risking firmware timeout failures during status polling.
What is the minimum VCC required for write operations on the 93C56B-E/P?
The 93C56B-E/P requires VCC ≥ 4.5 V for all write, erase, ERAL, and WRAL operations. Its power-on reset (POR) threshold is 3.8 V, meaning write commands issued below 4.5 V will be ignored or result in incomplete programming - a hardware safeguard against brown-out corruption.
How does the 93C56B-E/P differ from the 93C56C-E/P in terms of pin functionality?
The 93C56B-E/P has pins 6 and 7 marked NC (no internal connection), while the 93C56C-E/P uses pin 6 as ORG for x8/x16 configuration. This makes the 93C56B-E/P pinout incompatible with ORG-driven designs and eliminates configuration flexibility - but simplifies layout by removing ORG routing and pull-up/pull-down requirements.
Is the 93C56B-E/P RoHS compliant and lead-free?
Yes, the 93C56B-E/P is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on its PDIP leads. This meets EU Directive 2011/65/EU and is verified in Microchip's DS21794G datasheet revision G (2011), ensuring environmental compliance for global automotive and industrial shipments.
93C56B-E/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
93C56B-E/P FAQ
1.How can I place an order for 93C56B-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-E/P 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 93C56B-E/P reliable?
The price and inventory of 93C56B-E/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56B-E/P is usually 5 days.
3.What payment methods are accepted for 93C56B-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-E/P?
93C56B-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-E/P 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 93C56B-E/P?
For technical support, including 93C56B-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-E/P requirements.
6.How does Aetrix verify that 93C56B-E/P is sourced from the original manufacturer or authorized distributors?
All 93C56B-E/P 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 93C56B-E/P meets industry standards.
7.What is the process for return or replacement of 93C56B-E/P?
All 93C56B-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-E/P, 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 93C56B-E/P part is unused and in its original packaging.
Return procedure for 93C56B-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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