The XQ1701LCC44M is a high-reliability configuration PROM manufactured by Xilinx, specifically designed for storing FPGA bitstreams in demanding military and aerospace applications. This QML-certified device offers 1 Mbit storage capacity in a rugged 44-pin ceramic LCC package. Engineers seeking dependable Xilinx FPGA configuration solutions will find the XQ1701LCC44M an ideal choice for mission-critical systems.
XQ1701LCC44M Overview and Key Features
The XQ1701LCC44M belongs to Xilinx’s QPro series of configuration PROMs. These devices provide one-time programmable (OTP) memory for storing FPGA configuration data. The XQ1701LCC44M supports both Master Serial and Slave Serial configuration modes, making it versatile for various system architectures.
Primary Features of the XQ1701LCC44M
The XQ1701LCC44M delivers several critical capabilities for high-reliability applications:
- QML-certified manufacturing process ensures consistent quality
- 1,048,576 configuration bits (1 Mbit) storage capacity
- Simple serial interface requiring only one user I/O pin
- Cascadable architecture for longer or multiple bitstreams
- Programmable reset polarity (active High or active Low)
- Fast configuration mode support up to 15.0 MHz
- Military-grade temperature range: -55°C to +125°C
Compatible FPGA Devices
The XQ1701LCC44M supports configuration of multiple Xilinx FPGA families. The table below shows compatible devices and their configuration bit requirements.
| FPGA Device |
Configuration Bits |
PROMs Required |
| XQ4013XL |
393,632 |
1 |
| XQ4036XL |
832,528 |
1 |
| XQ4062XL |
1,433,864 |
2 |
| XQV300 |
1,751,840 |
2 |
| XQV600 |
3,608,000 |
4 |
| XQV1000 |
6,127,776 |
6 |
XQ1701LCC44M Pin Configuration
Understanding the XQ1701LCC44M pinout is essential for proper circuit design. The 44-pin ceramic LCC package provides robust connectivity for configuration signals.
XQ1701LCC44M Pinout Table
| Pin Name |
Pin Number |
Function |
| DATA |
2 |
Serial data output |
| GND |
3, 24 |
Ground connections |
| CLK |
5 |
Clock input |
| RESET/OE |
19 |
Reset and output enable |
| CE |
21 |
Chip enable |
| CEO |
27 |
Chip enable output (cascade) |
| VPP |
41 |
Programming voltage |
| VCC |
44 |
Power supply |
Pin Functions Explained
DATA Pin: This output provides serial configuration data. The pin enters high-impedance state when CE or OE are inactive. During programming operations, DATA functions as bidirectional I/O.
CLK Pin: Each rising edge on CLK increments the internal address counter. Both CE and OE must be active for counter operation.
RESET/OE Pin: This dual-function pin controls address counter reset and data output state. The polarity is programmable, defaulting to active High but preferably configured as active Low for FPGA INIT pin compatibility.
CE Pin: When High, this pin disables the address counter and forces standby mode. This reduces supply current to minimal levels.
CEO Pin: This output enables cascading multiple PROMs. It goes Low when the internal address counter exceeds Terminal Count while CE and OE are active.
XQ1701LCC44M Electrical Specifications
The XQ1701LCC44M operates within strict electrical parameters. Engineers must observe these limits for reliable operation.
DC Characteristics
| Parameter |
Symbol |
Min |
Max |
Unit |
| Supply Voltage |
VCC |
3.0 |
3.6 |
V |
| High-Level Input Voltage |
VIH |
2.0 |
VCC |
V |
| Low-Level Input Voltage |
VIL |
0 |
0.8 |
V |
| High-Level Output Voltage |
VOH |
2.4 |
– |
V |
| Low-Level Output Voltage |
VOL |
– |
0.4 |
V |
| Active Supply Current |
ICCA |
– |
10 |
mA |
| Standby Supply Current |
ICCS |
– |
100 |
µA |
| Input/Output Leakage |
IL |
-10 |
10 |
µA |
AC Timing Characteristics
| Parameter |
Symbol |
Min |
Max |
Unit |
| OE to Data Delay |
TOE |
– |
30 |
ns |
| CE to Data Delay |
TCE |
– |
45 |
ns |
| CLK to Data Delay |
TCAC |
– |
45 |
ns |
| CE/OE to Data Float |
TDF |
– |
50 |
ns |
| Data Hold Time |
TOH |
0 |
– |
ns |
| Clock Period |
TCYC |
67 |
– |
ns |
| CLK Low Time |
TLC |
25 |
– |
ns |
| CLK High Time |
THC |
25 |
– |
ns |
XQ1701LCC44M Operating Modes
The XQ1701LCC44M supports multiple operating configurations. Each mode serves specific system requirements.
Master Serial Mode Operation
In Master Serial mode, the FPGA generates the configuration clock. This clock drives the XQ1701LCC44M, which outputs data synchronously. The FPGA controls the entire configuration sequence automatically.
Key connections for Master Serial mode:
- PROM DATA output connects to FPGA DIN input
- FPGA CCLK output drives PROM CLK input
- FPGA INIT output drives PROM RESET/OE input
- FPGA DONE or LDC output drives PROM CE input
Slave Serial Mode Operation
Slave Serial mode requires an external clock source. Both the XQ1701LCC44M and FPGA receive clock signals from the same external source. This mode provides greater system control over configuration timing.
Cascade Configuration for Multiple PROMs
When larger storage is needed, multiple XQ1701LCC44M devices can be cascaded. The CEO output of the first PROM connects to the CE input of the next. All CLK and DATA lines are shared across the chain.
XQ1701LCC44M Absolute Maximum Ratings
Never exceed these absolute maximum ratings. Exceeding these values may permanently damage the XQ1701LCC44M.
| Parameter |
Symbol |
Rating |
Unit |
| Supply Voltage (VCC) |
VCC |
-0.5 to +4.0 |
V |
| Programming Voltage |
VPP |
-0.5 to +12.5 |
V |
| Input Voltage |
VIN |
-0.5 to VCC+0.5 |
V |
| High-Z Output Voltage |
VTS |
-0.5 to VCC+0.5 |
V |
| Storage Temperature |
TSTG |
-65 to +150 |
°C |
XQ1701LCC44M Truth Table
Understanding the control input behavior helps ensure proper XQ1701LCC44M operation.
| RESET |
CE |
Address Counter |
DATA |
CEO |
ICC Mode |
| Inactive |
Low |
Increment (if < TC) |
Active |
Low/High |
Active |
| Active |
Low |
Held Reset |
High-Z |
High |
Active |
| Inactive |
High |
No Change |
High-Z |
High |
Standby |
| Active |
High |
Held Reset |
High-Z |
High |
Standby |
XQ1701LCC44M Ordering Information
The XQ1701LCC44M follows Xilinx’s standard ordering format. Multiple variants serve different application requirements.
Part Number Breakdown
| Part Number |
Package |
Grade |
Temperature Range |
| XQ1701LCC44M |
44-pin Ceramic LCC |
Military |
-55°C to +125°C |
| XQ1701LSO20N |
20-pin SOIC |
Military Plastic |
-55°C to +125°C |
| XQR1701LCC44V |
44-pin Ceramic LCC |
QPro-Plus Rad-Hard |
-55°C to +125°C |
Military Standard SMD Numbers
For military procurement, use these Standard Microcircuit Drawing numbers:
| SMD Number |
Device |
Package |
| 5962-9951401QYA |
XQ1701L |
44-pin CLCC, Solder Dip |
| 5962-9951401NXB |
XQ1701L |
20-pin SOIC, Solder Plate |
Radiation-Hardened Alternative: XQR1701L
For space and high-radiation environments, Xilinx offers the XQR1701L variant. This radiation-hardened version provides enhanced protection against ionizing radiation.
XQR1701L Radiation Specifications
| Parameter |
Description |
Value |
Unit |
| TID |
Total Ionizing Dose |
>50 |
krad(Si) |
| SEL |
Single Event Latch-up |
0 |
cm²/Device |
| SEU |
Single Event Bit Upset |
0 |
cm²/Bit |
| SEFI |
Single Event Functional Interrupt |
1.2e-5 |
cm²/Device |
The XQR1701L uses epitaxial silicon fabrication. This technology provides immunity to Single Event Latch-up at LET values exceeding 120 MeV·cm²/mg.
Design Considerations for XQ1701LCC44M
Successful XQ1701LCC44M implementation requires attention to several design factors.
Power Supply Requirements
The VPP pin must connect to VCC during normal read operation. Leaving VPP floating causes unpredictable behavior. This connection is essential for reliable temperature-stable operation.
Reset Polarity Selection
Configure RESET/OE polarity during programming. Active Low reset allows direct connection to the FPGA INIT pin. This connection ensures proper address counter reset during any reconfiguration event.
Standby Power Management
Driving CE High puts the XQ1701LCC44M into low-power standby mode. This reduces supply current to 100 µA maximum. Use this feature when configuration is complete to minimize system power consumption.
Programming Support for XQ1701LCC44M
The XQ1701LCC44M supports programming through multiple methods. Xilinx Alliance and Foundation development tools generate compatible programming files.
Supported Programming Methods
- Xilinx HW-130 Programmer
- Third-party universal programmers
- Standard Hex format file generation from development tools
Ensure you use the correct programming algorithm. Using an incorrect algorithm can permanently damage the device.
Conclusion
The XQ1701LCC44M provides reliable FPGA configuration storage for military and aerospace applications. Its QML certification, wide temperature range, and cascade capability make it suitable for demanding environments. Engineers can achieve simple, robust FPGA configuration using this proven Xilinx solution.
For complete application support and additional technical documentation, contact your authorized Xilinx distributor.
