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Microchip Technology AT27C020-70TC
- Part No.:
- AT27C020-70TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-70TC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,972
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Product details
Overview
AT27C020-70TC from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM optimized for fast read access and low-power operation in embedded firmware storage applications. It features 55 ns read access time, 5V ±10% supply, and operates across commercial temperature range (0°C to 70°C). Its TSOP-32 package supports space-constrained PCB layouts in microcontroller-based systems requiring nonvolatile program memory.
For engineers reviewing the AT27C020-70TC datasheet, AT27C020-70TC pinout, AT27C020-70TC application, or AT27C020-70TC equivalent, key selection considerations include verified 55 ns tACC timing, 100 µA max standby current, JEDEC-standard TSOP packaging, Rapid™ programming compatibility, and CMOS/TTL I/O interface compliance.
Technical Context
The AT27C020-70TC implements a two-line control architecture using CE and OE for bus contention prevention and supports both standard read and rapid programming modes with dedicated VPP (12.0 V ±0.5 V) and PGM strobe inputs. Its address decoding covers A0–A17 (18-bit), enabling full 256K-byte addressing without external latching.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200 mA latch-up immunity, and integrates an electronic product identification code accessible via A9/VH and A0 toggling - enabling automated programmer recognition of manufacturer (0x1E) and device code (0x86).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8); provides sufficient capacity for boot code or firmware images in 8-bit microcontroller systems. |
| Read Access Time (tACC) | 70 ns max; ensures compatibility with 10–14 MHz Z80, 8051, and 68K-family processors without wait states. |
| VCC Supply | 5V ±10%; eliminates need for dedicated voltage regulators in legacy 5V logic systems. |
| Standby Current (ISB1) | 100 µA max (CMOS CE); enables low-power retention in battery-backed or intermittently powered systems. |
| Active Current (ICC) | 25 mA max at 5 MHz; supports sustained read bursts without thermal derating in compact enclosures. |
| Programming Voltage (VPP) | 12.0 V ±0.5 V; requires external high-voltage supply during programming, isolated from VCC per datasheet sequencing rules. |
| Operating Temperature | 0°C to 70°C (Commercial); validated for use in office equipment, industrial HMIs, and consumer electronics enclosures. |
Pinout & Package
AT27C020-70TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, JEDEC MO-142 BD), 10.16 mm × 20.0 mm footprint, 1.2 mm max height, gull-wing leads, pitch 0.5 mm. Pin 1 marked by notch or index dot; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit parallel address bus; fully decodes 256K locations; TTL/CMOS compatible thresholds (VIL ≤0.8 V, VIH ≥2.0 V). |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when OE or CE inactive; VOL ≤0.4 V @ 2.1 mA. |
| CE | Chip Enable | Active-low chip select; controls device enable/disable; must be stable before address setup to meet tCES ≥2 µs. |
| OE | Output Enable | Active-low output gate; enables data drivers only when CE is also active; tOE = 30 ns max for -70 speed grade. |
| PGM | Program Strobe | Active-low programming pulse input; triggers 100 µs ±5% write cycle when VPP = 12 V and CE = VIL. |
| VPP | Programming Voltage | 12.0 V ±0.5 V input; must be applied after VCC and removed before VCC; requires 0.1 µF ceramic bypass to GND. |
| VCC | Power Supply | +5V ±10% main supply; powers logic and outputs; ICC = 25 mA max during active read at 5 MHz. |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic capacitor placement adjacent to pins 16 and 32 per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop; reduces production burn-in duration and improves yield traceability. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x86) readable via A9/VH + A0 toggle; enables automatic algorithm selection in universal programmers. |
| Two-Line Control (CE/OE) | Independent chip and output enables eliminate bus contention during partial memory mapping or shared data bus configurations. |
| JEDEC-Standard Packages | TSOP-32 (32T) variant matches industry-standard footprint; allows drop-in replacement in existing designs using PLCC or PDIP variants. |
| High-Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latch-up immunity ensure robustness in manual handling and noisy industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers where field updates are rare but long-term data retention is critical. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; accessed via 8-bit data bus and 18-bit address lines during cold start and watchdog reset recovery. Use Value: 70 ns tACC eliminates wait-state insertion on 8 MHz 80C51 derivatives, preserving real-time scan cycle integrity. |
Use Scenario: Providing boot code for 8-bit microcontrollers in medical diagnostic instruments requiring regulatory-compliant firmware immutability. IC Role / Device Role / Timing Role: OTP EPROM used as primary boot ROM; initialized at power-on reset; no runtime writes permitted post-deployment. Use Value: One-time programmability prevents accidental corruption or malicious reprogramming, satisfying IEC 62304 Class B software safety requirements. |
| Automated Test Equipment (ATE) Configuration Memory | Point-of-Sale Terminal BIOS Storage |
|
Use Scenario: Holding calibration constants and test sequence definitions in benchtop ATE systems where firmware changes occur only during factory recalibration. IC Role / Device Role / Timing Role: Static configuration store accessed during initialization; read-only during functional test execution. Use Value: 100 µA max ISB1 enables low-quiescent power draw during idle periods between test runs, reducing thermal load in dense rack-mounted units. |
Use Scenario: Storing secure bootloader and hardware initialization routines in retail POS terminals deployed globally with multi-region firmware variants. IC Role / Device Role / Timing Role: Primary firmware image storage; mapped to reset vector address; verified via checksum prior to application code execution. Use Value: Integrated product ID code allows automated version verification during manufacturing flash programming, preventing mix-ups between regional SKUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120DC | 256K × 8 OTP EPROM, 120 ns tACC, 28-pin PDIP only, no integrated ID code, VPP = 21 V. | Slower access limits use with >8 MHz CPUs; higher VPP complicates programming infrastructure; lacks auto-ID for programmer compatibility. | Select when legacy 28-pin socket compatibility is mandatory and 120 ns timing suffices for target MCU clock. |
| MX27C256-12PC | 256K × 8 OTP EPROM, 120 ns tACC, 28-pin PDIP, VPP = 21 V, no Rapid™ algorithm or ID code. | No rapid programming support increases production time; no ID code requires manual algorithm selection; incompatible TSOP footprint. | Choose only for cost-sensitive, low-volume replacements where existing 28-pin sockets and 21 V programmers are already deployed. |
Compared with AM27C256B-120DC and MX27C256-12PC, the AT27C020-70TC delivers 1.7× faster read access, built-in identification for automated programming, and JEDEC-standard TSOP-32 packaging - making it preferable for new designs targeting compact layouts and production efficiency.
Availability
AT27C020-70TC is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller platforms, and embedded instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for AT27C020-70TC 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
Atmel Corporation was a U.S.-based semiconductor designer specializing in microcontrollers, nonvolatile memory, and wireless solutions before its acquisition by Microchip Technology in 2016.
The AT27C020 belongs to Atmel's 27C-series OTP EPROM family, engineered for reliable firmware storage in cost-sensitive, high-volume embedded systems where reprogrammability is unnecessary and data integrity over decades is essential.
FAQ
What is the maximum read access time specified for the AT27C020-70TC?
The AT27C020-70TC 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 applies specifically to the -70 speed grade, distinguishing it from slower variants like -90 or -120. The AT27C020-70TC achieves this performance while maintaining full compatibility with TTL and CMOS logic families.
Does the AT27C020-70TC support in-system programming?
No, the AT27C020-70TC does not support in-system programming. It is a one-time programmable (OTP) EPROM requiring external high-voltage (12.0 V ±0.5 V) programming equipment with precise VPP sequencing relative to VCC. Programming must occur off-board using dedicated EPROM programmers that implement the Rapid™ algorithm; the AT27C020-70TC lacks internal charge pumps or ISP circuitry.
What package type is used for the AT27C020-70TC?
The AT27C020-70TC uses a 32-lead Plastic Thin Small Outline Package (TSOP), designated JEDEC MO-142 BD, with 0.5 mm lead pitch and 10.16 mm × 20.0 mm body dimensions. This surface-mount package replaces through-hole alternatives like PDIP and PLCC, enabling higher board density in space-constrained applications where the AT27C020-70TC is deployed.
How is the product identification code accessed on the AT27C020-70TC?
The AT27C020-70TC's integrated product identification code is accessed by asserting A9 at VH (11.5–12.5 V) while holding A1–A17 low and toggling A0 between VIL and VIH. This selects either the Manufacturer ID byte (0x1E) or Device Code byte (0x86) on O0–O7. The AT27C020-70TC uses this feature to enable automatic algorithm detection in industry-standard programmers without manual configuration.
What are the recommended decoupling capacitors for the AT27C020-70TC?
Per the AT27C020-70TC datasheet, a 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND as close as possible to pins 16 and 32. For systems with multiple AT27C020-70TC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values stabilize supply transients during CE transitions and prevent non-conformance due to voltage excursions.
AT27C020-70TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K 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:
- 32-TSOP
AT27C020-70TC FAQ
1.How can I place an order for AT27C020-70TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-70TC 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 AT27C020-70TC reliable?
The price and inventory of AT27C020-70TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-70TC is usually 5 days.
3.What payment methods are accepted for AT27C020-70TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-70TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-70TC?
AT27C020-70TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-70TC 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 AT27C020-70TC?
For technical support, including AT27C020-70TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-70TC requirements.
6.How does Aetrix verify that AT27C020-70TC is sourced from the original manufacturer or authorized distributors?
All AT27C020-70TC 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 AT27C020-70TC meets industry standards.
7.What is the process for return or replacement of AT27C020-70TC?
All AT27C020-70TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-70TC, 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 AT27C020-70TC part is unused and in its original packaging.
Return procedure for AT27C020-70TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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