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Microchip Technology AT27C512R-70TC
- Part No.:
- AT27C512R-70TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C512R-70TC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
AT27C512R-70TC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply operation, and JEDEC-standard 28-lead TSOP package. It delivers high-speed firmware storage for microprocessor systems without wait states and supports commercial temperature range (0°C to 70°C).
For engineers reviewing the AT27C512R-70TC datasheet, AT27C512R-70TC pinout, AT27C512R-70TC application, or AT27C512R-70TC equivalent, key selection considerations include its 45 ns tACC timing grade, 100 µA max standby current, dual-control CE/OE interface, and Rapid™ programming at 100 µs/byte - critical for embedded boot code and legacy system upgrades.
Technical Context
The AT27C512R-70TC implements a CMOS-based OTP EPROM architecture with two-line control (CE and OE/VPP), enabling bus contention prevention in shared-memory systems. Its address space spans A0–A15 (16-bit), supporting full 64K-byte random access with TTL/CMOS-compatible I/O levels.
Programming uses a dedicated VPP mode (13.0 V ±0.25 V on OE/VPP pin) with 100 µs CE pulses and integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0D). The device features 2,000V ESD protection and 200 mA latchup immunity, meeting industrial reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time (tACC) | 70 ns max - guarantees compatibility with 14 MHz Z80 or 12.5 MHz 8086 systems without wait states |
| VCC Supply | 5V ±10% - single-supply operation eliminates need for auxiliary voltage rails |
| Standby Current (ISB1) | 100 µA max - enables low-power retention in battery-backed or intermittent-use systems |
| Active Current (ICC) | 20 mA max at 5 MHz - supports sustained burst reads in real-time control loops |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time by >90% vs. legacy EPROMs |
| ESD Protection | 2,000V HBM - ensures robustness during board handling and in-circuit programming |
Pinout & Package
AT27C512R-70TC is housed in a 28-lead Thin Small Outline Package (TSOP, Type 1, JEDEC MO-153), 8.10 mm × 13.7 mm footprint, 1.2 mm height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 64K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; CMOS/TTL-compatible drive strength |
| CE | Chip Enable | Active-low chip select; controls device enable/disable and power state transitions |
| OE/VPP | Output Enable / Programming Voltage | Dual-function pin: OE during read; 13 V programming voltage input during Rapid™ programming |
| GND | Ground Reference | Signal and power ground return path; requires local 0.1 µF ceramic decoupling |
| VCC | Power Supply | +5V ±10% main supply; must be applied simultaneously with or before OE/VPP |
| NC | No Connect | Pins 1, 2, 21, 22, 27, 28 - electrically isolated; no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - cuts production burn-in time vs. standard EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device ID (0x0D) readable via A9/A0 toggling - enables automated programmer validation |
| Two-Line Control Architecture | Independent CE and OE/VPP pins - prevents bus contention and allows flexible memory mapping in multi-peripheral systems |
| High-Reliability CMOS Process | 2,000V ESD rating and 200 mA latchup immunity - suitable for industrial environments with noisy power rails |
| JEDEC-Standard Packaging | 28-lead TSOP (28T) footprint - direct drop-in replacement for legacy 27C512 variants in space-constrained PCBs |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to initialization code upon power-up. Use Value: Eliminates reliance on external EEPROM or flash, reducing BOM count and avoiding wear-out concerns in unattended 24/7 operation. |
Use Scenario: Hosting immutable startup routines and interrupt vectors for Z80, 8051, or 68000-based embedded controllers in avionics and medical equipment. IC Role / Device Role / Timing Role: Primary read-only instruction memory with guaranteed tACC ≤ 70 ns - meets tight timing budgets of legacy CPU buses. Use Value: Ensures zero-wait-state execution of critical boot code, improving system reliability over reprogrammable alternatives subject to corruption. |
| Automotive Instrument Cluster Calibration Data | Test Equipment PROM Replacement |
Use Scenario: Holding calibrated display offsets and sensor compensation tables in automotive digital dashboards across -40°C to +85°C industrial temp range. IC Role / Device Role / Timing Role: OTP storage for safety-critical calibration constants; accessed only during power-on self-test (POST). Use Value: Prevents field tampering or accidental overwrite while maintaining AEC-Q100-aligned reliability (latchup immunity, ESD robustness). |
Use Scenario: Replacing obsolete 27C512 devices in automated test equipment (ATE) pattern generators and logic analyzers requiring long-term firmware stability. IC Role / Device Role / Timing Role: Pin-compatible firmware repository delivering consistent 70 ns read latency across decades of deployed units. Use Value: Enables lifecycle continuity without PCB redesign - same 28T footprint, identical timing, and JEDEC-compliant signal levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-70PC | Same die, 28-lead PDIP package (28P6); 0.600" width, through-hole mounting | Suitable for prototyping, legacy repair, or sockets where surface-mount is not feasible | Select when manual assembly, rework, or socket-based testing is required |
| AT27C512R-70RC | Same die, 28-lead SOIC package (28R); 0.330" width, gull-wing leads | Offers higher thermal dissipation than TSOP; preferred for convection-cooled industrial boards | Select for improved thermal performance in enclosed enclosures or high-ambient environments |
Compared with AT27C512R-70TC, the AT27C512R-70PC provides mechanical robustness and ease of replacement in serviceable systems, while AT27C512R-70RC offers better thermal management and solder-joint reliability - all three share identical timing, programming behavior, and functional pinout.
Availability
AT27C512R-70TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive instrument cluster calibration data requiring stable component supply and long-term obsolescence support.
Supply support for AT27C512R-70TC 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 acquired Atmel in 2016 and maintains full technical and supply chain continuity for the AT27C512R family, including legacy OTP EPROMs.
The AT27C512R product line was designed for reliable, non-volatile firmware storage in cost-sensitive, high-reliability embedded systems where reprogrammability is unnecessary and data integrity is paramount.
FAQ
What is the maximum read access time specified for the AT27C512R-70TC?
The AT27C512R-70TC has a maximum read access time (tACC) of 70 ns under standard operating conditions (VCC = 5V ±10%, TA = 0°C to 70°C). This value is guaranteed across the commercial temperature range and reflects the worst-case delay from address valid to valid data output when both CE and OE/VPP are asserted low.
Does the AT27C512R-70TC support in-system programming?
No, the AT27C512R-70TC does not support in-system programming. It is a one-time programmable (OTP) EPROM requiring external UV-erasable or dedicated EPROM programmers. Programming must be performed before soldering, using 13.0 V ±0.25 V on the OE/VPP pin and 100 µs CE pulses per byte - not compatible with ISP protocols like SPI or JTAG.
What is the function of the OE/VPP pin on the AT27C512R-70TC?
The OE/VPP pin on the AT27C512R-70TC serves a dual role: during normal read operation, it functions as Output Enable (active-low); during programming, it accepts 13.0 V ±0.25 V as the VPP programming voltage. The pin must never be driven to intermediate voltages - strict sequencing (VCC applied before/with OE/VPP) is required to prevent damage.
Can the AT27C512R-70TC be used as a direct replacement for older 27C512 variants?
Yes, the AT27C512R-70TC is functionally and pin-compatible with earlier 27C512 devices in the same package (e.g., 28T TSOP), provided the 70 ns speed grade meets system timing. It retains identical pinout, address/data organization, and CE/OE control - but adds Rapid™ programming and enhanced ESD/latchup specs not present in first-generation parts.
What decoupling capacitance is recommended for stable operation of the AT27C512R-70TC?
A 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND, as close as possible to the AT27C512R-70TC's pins. For systems with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor should also be added near the array's power entry point - both are mandatory to suppress transient excursions during CE-driven active-to-standby transitions.
AT27C512R-70TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT27C512R-70TC FAQ
1.How can I place an order for AT27C512R-70TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70TC 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 AT27C512R-70TC reliable?
The price and inventory of AT27C512R-70TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70TC is usually 5 days.
3.What payment methods are accepted for AT27C512R-70TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70TC?
AT27C512R-70TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70TC 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 AT27C512R-70TC?
For technical support, including AT27C512R-70TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70TC requirements.
6.How does Aetrix verify that AT27C512R-70TC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70TC 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 AT27C512R-70TC meets industry standards.
7.What is the process for return or replacement of AT27C512R-70TC?
All AT27C512R-70TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70TC, 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 AT27C512R-70TC part is unused and in its original packaging.
Return procedure for AT27C512R-70TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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