My Inquiry
My Account
Microchip Technology ATF1500AL-20AC
- Part No.:
- ATF1500AL-20AC
- Manufacturer:
- Microchip Technology
- Package:
- 44-TQFP
- Datasheet:
-
ATF1500AL-20AC.pdf
- Description:
- IC CPLD 32MC 20NS 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,440
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATF1500AL-20AC from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 32 macrocells, 32 I/O pins, and 4 dedicated global control inputs. It delivers 7.5 ns maximum pin-to-pin delay, supports registered operation up to 125 MHz with internal feedback, and features automatic 3 mA standby current for low-power embedded control applications.
For engineers reviewing the ATF1500AL-20AC datasheet, ATF1500AL-20AC pinout, ATF1500AL-20AC application, or ATF1500AL-20AC equivalent, key selection criteria include its TQFP-44 package, Flash-based reprogrammability, pin-keeper input/I/O capability, programmable slew rate per output, and industrial-grade temperature support when paired with -20AI variant.
Technical Context
The ATF1500AL-20AC implements a fully connected global bus architecture feeding all 32 macrocells with 68-bit signal availability (32 I/O + 4 dedicated inputs + 32 buried feedbacks), enabling flexible logic placement without pinout changes. Each macrocell integrates five product terms, OR/XOR/cascade logic, D/T/latch-configurable flip-flops, and individual output enable/slew control.
It supports both global clock (CLK pin) and product-term clocks, with asynchronous reset (GCLR) and dual active-low output enables (OE1/OE2). The device includes power-down mode via PD pin (active-high), automatic standby current reduction, and programmable pin-keeper circuits to eliminate floating inputs and external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Density | 32 macrocells with 5 product terms each, supporting up to 40-term sum logic via cascade chains |
| Max Pin-to-Pin Delay | 7.5 ns - enables reliable timing closure in 40+ MHz synchronous designs |
| Max Registered Speed | 125 MHz with internal feedback - suitable for high-speed state machines and data path control |
| Standby Current | 3 mA (typical) - reduces system power during idle periods without external control |
| I/O Count | 32 bidirectional I/O pins + 4 dedicated inputs (CLK, GCLR, OE1, OE2) - provides flexible interface routing |
| Supply Voltage | 5 V ± 5% - compatible with legacy TTL/CMOS logic families and industrial 5 V rails |
| Operating Temperature | 0°C to 70°C (Commercial) - validated for stable operation in office and lab environments |
Pinout & Package
ATF1500AL-20AC is housed in a 44-lead Thin Quad Flatpack (TQFP) package, measuring 10 mm × 10 mm with 0.8 mm lead pitch and 1.0 mm body thickness (JEDEC MS-026 ACB compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–11, 13–22, 24–33, 35–44 | I/O | Bidirectional logic buffers with programmable pin-keeper, slew rate, and output enable |
| 12, 23, 34 | GND | Ground reference for core and I/O circuitry - three dedicated pins reduce ground bounce |
| 24, 36 | VCC | +5 V supply for core logic and I/O drivers - dual pins improve power delivery integrity |
| 43 | CLK | Global clock input - drives all macrocell flip-flops on rising edge; supports product-term clocking |
| 42 | GCLR | Active-low global register reset - asynchronously clears all macrocell flip-flops |
| 41, 40 | OE1, OE2 | Active-low output enables - individually assignable per macrocell or globally asserted |
| 39 | PD | Active-high power-down control - reduces ICC to <10 mA; latches outputs and internal states |
Key Features
| Feature | Design Value |
|---|---|
| Flash-based reprogrammability | 100 program/erase cycles with 20-year data retention - enables field updates and design iteration without hardware change |
| Programmable slew rate per I/O | Slow (default) or fast switching selectable per macrocell - reduces EMI on non-critical signals while preserving speed where needed |
| Pin-keeper circuitry | Configurable on all I/O and input pins - prevents floating states and eliminates need for external pull-up resistors |
| Security fuse | Single-programmable fuse blocking JEDEC file readback - protects intellectual property in production units |
| Backward software compatibility | Fully supported by ATF1500/L design tools - allows reuse of legacy HDL and fitting flows |
Applications
| Industrial Control Logic | Legacy System Emulation |
|---|---|
Use Scenario: Replacing discrete TTL/SSI logic and older PLDs in PLC I/O modules and motion controller sequencers. IC Role / Device Role / Timing Role: Configurable glue logic implementing address decoding, bus arbitration, and state-machine control with deterministic 7.5 ns propagation. Use Value: Reduces BOM count and PCB area versus discrete solutions while maintaining 5 V tolerance and industrial temperature margin via -20AI variant. |
Use Scenario: Emulating obsolete PAL/GAL devices in avionics maintenance test equipment requiring field-reprogrammable logic. IC Role / Device Role / Timing Role: Pin-compatible replacement with Flash non-volatility - retains configuration across power cycles without battery backup. Use Value: Eliminates obsolescence risk and enables firmware-driven logic updates without board redesign or socket replacement. |
| Power Management Sequencing | Test Equipment Signal Conditioning |
Use Scenario: Coordinating startup/shutdown sequences for multi-rail power supplies in telecom line cards and base station subsystems. IC Role / Device Role / Timing Role: Synchronized control hub using GCLR for safe reset coordination and OE-controlled tri-state isolation of enable lines. Use Value: Ensures strict voltage ramp ordering and fault-safe shutdown via registered logic with 125 MHz timing margin. |
Use Scenario: Level-shifting, signal inversion, and timing alignment of digital stimulus/response channels in automated test systems. IC Role / Device Role / Timing Role: High-speed combinatorial logic block with programmable slew control to match channel skew and minimize jitter. Use Value: Achieves sub-10 ns timing precision across 32 channels while reducing crosstalk through controlled edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPLD applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATF1502AS-10AU | Pin-compatible upgrade with 10 ns tPD, green RoHS-compliant PLCC/TQFP, and enhanced ESD rating (2000 V HBM) | Supports industrial temperature range (-40°C to +85°C) out-of-box; requires no layout change | Select when long-term supply continuity, RoHS compliance, and extended temperature operation are required |
| XCR3064XL-10VQ44C | 64-macrocell Xilinx CoolRunner-II CPLD with 3.3 V core, 5 V tolerant I/O, and 10 ns tPD | Higher density and lower static power (10 µA), but requires level translation for pure 5 V systems | Select when migrating to modern low-power architectures with mixed-voltage I/O and longer product lifecycle |
Compared with ATF1500AL-20AC, ATF1502AS-10AU offers guaranteed industrial temperature support and RoHS compliance in same footprint, while XCR3064XL-10VQ44C provides double the logic capacity and microamp-level standby at the cost of 5 V system integration complexity.
Availability
ATF1500AL-20AC is available at Aetrix Electronics and suitable for industrial control logic, legacy system emulation, power management sequencing, and test equipment signal conditioning requiring stable component supply and full traceability.
Supply support for ATF1500AL-20AC 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 legacy PLD product support, quality assurance, and documentation for industrial and aerospace customers.
The ATF1500A(L) family was designed for 5 V system integration, offering Flash-based reprogrammability, low-power standby, and pin-keeper functionality to replace TTL, SSI, MSI, and classic PLDs in cost-sensitive embedded control.
FAQ
What is the maximum operating frequency of the ATF1500AL-20AC in registered mode?
The ATF1500AL-20AC supports registered operation up to 125 MHz when using internal feedback paths, as confirmed by fMAX = 1/(tSFS + tCFS) = 125 MHz in the -20 speed grade. This performance is achievable with proper PCB layout, 5 V ±5% supply, and ambient temperatures within 0°C to 70°C. The ATF1500AL-20AC achieves this using its fully connected global bus and optimized macrocell cascade structure.
Does the ATF1500AL-20AC require an external programmer, and what file format does it use?
Yes, the ATF1500AL-20AC requires an external ISP-capable programmer such as the Atmel ICE or third-party JTAG programmers supporting IEEE 1149.1. It uses standard JEDEC JESD-30 and JESD-71 file formats for configuration programming. The ATF1500AL-20AC supports in-system programming via its JTAG port, eliminating the need for socketed programming before assembly.
How does the pin-keeper feature function on the ATF1500AL-20AC, and can it be disabled?
The ATF1500AL-20AC includes programmable pin-keeper circuits on all I/O and input pins that retain the last driven logic state (high or low) when the pin becomes floating. This feature is enabled or disabled per-pin in the design source file during compilation - no external components are needed. When disabled, standard termination practices apply. The ATF1500AL-20AC pin-keeper eliminates DC power waste from pull-up resistors and prevents noise-induced glitches.
What is the purpose of the PD pin on the ATF1500AL-20AC, and how does it affect device behavior?
The PD (Power-Down) pin on the ATF1500AL-20AC is an active-high control input that places the device into a low-current standby mode (<10 mA) when asserted. In this state, all internal logic states and output levels are latched and held, and input transitions (except PD itself) are ignored. The PD function must be enabled in the design file; once enabled, the PD pin cannot serve as a general-purpose logic input or output, though its macrocell resources remain usable for foldback logic. The ATF1500AL-20AC enters this mode only when PD is high and exits within 1 µs after PD returns low.
Is the ATF1500AL-20AC compatible with industrial temperature requirements, and what is the alternative if needed?
The ATF1500AL-20AC is specified for commercial temperature range (0°C to 70°C). For industrial operation (-40°C to +85°C), the direct alternative is ATF1500AL-20AI - identical logic and pinout but qualified across the extended range. Both share the same 7.5 ns tPD, 3 mA standby current, and Flash architecture. The ATF1500AL-20AC itself is not rated for industrial temperatures, and derating is not recommended per manufacturer guidance.
ATF1500AL-20AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- ATF15xx
- Package/Case:
- 44-TQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Programmable Type:
- In System Programmable (min 100 program/erase cycles)
- Delay Time tpd(1) Max:
- 20 ns
- Voltage Supply - Internal:
- 4.75V ~ 5.25V
- Number of Logic Elements/Blocks:
- -
- Number of Macrocells:
- 32
- Number of Gates:
- -
- Number of I/O:
- 32
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-TQFP (10x10)
ATF1500AL-20AC FAQ
1.How can I place an order for ATF1500AL-20AC through Aetrix?
Please submit a Request for Quotation (RFQ) for ATF1500AL-20AC 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 ATF1500AL-20AC reliable?
The price and inventory of ATF1500AL-20AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1500AL-20AC is usually 5 days.
3.What payment methods are accepted for ATF1500AL-20AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1500AL-20AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATF1500AL-20AC?
ATF1500AL-20AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATF1500AL-20AC 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 ATF1500AL-20AC?
For technical support, including ATF1500AL-20AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1500AL-20AC requirements.
6.How does Aetrix verify that ATF1500AL-20AC is sourced from the original manufacturer or authorized distributors?
All ATF1500AL-20AC 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 ATF1500AL-20AC meets industry standards.
7.What is the process for return or replacement of ATF1500AL-20AC?
All ATF1500AL-20AC units undergo pre-shipment inspection (PSI). If there is an issue with ATF1500AL-20AC, 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 ATF1500AL-20AC part is unused and in its original packaging.
Return procedure for ATF1500AL-20AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATF1500AL-20AC Tags
-
5M40ZE64C5N
Intel
-
ATF1502ASV-15AU44
Microchip Technology
-
5M80ZE64C5N
Intel
-
5M80ZT100C5N
Intel
-
ATF1502AS-10AU44
Microchip Technology
-
ATF1502AS-10JU44
Microchip Technology
-
5M80ZE64I5N
Intel
-
5M80ZT100I5N
Intel
-
LC4032V-75TN48C
Lattice Semiconductor Corporation
-
ATF1504ASV-15AU44
Microchip Technology
-
ATF1504AS-10JU44
Microchip Technology
-
5M160ZE64C5N
Intel
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
