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PCF8564ACX9/1,005 Equivalent & Substitute Parts
Part Overview
The PCF8564ACX9/1,005 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, featuring I2C 2-Wire Serial interface. This die-format component provides timekeeping with alarm capability, leap year support, square wave output, and watchdog timer functionality. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Part Number | PCF8564ACX9/1,005 |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (24 hr) |
| Date Format | YY-MM-DD-dd |
| Voltage Supply Range | 1V ~ 5.5V |
| Current - Timekeeping (Max) | 0.6µA ~ 0.75µA @ 2V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | Die |
| Features | Alarm, Leap Year, Square Wave Output, Watchdog Timer |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the PCF8564ACX9/1,005 is determined by the following critical parameters:
Interface Compatibility: I2C 2-Wire Serial protocol is mandatory for all substitutes.
Functional Features: Alarm and Leap Year support are required core features. Square Wave Output presence varies among substitutes but does not preclude substitution.
Time/Date Format: 24-hour time format and YY-MM-DD-dd date format are standard across all substitutes.
Voltage Operating Range: The original part operates 1V ~ 5.5V. Substitutes with overlapping or extended voltage ranges are acceptable, provided minimum operating voltage does not exceed the original specification.
Temperature Range: Operating temperature -40°C ~ 85°C is maintained across all substitutes.
Package Consideration: The original part is a die format. Substitutes are available in standard surface-mount packages (8-SOIC, 8-TSSOP/8-MSOP, 20-SOIC), which require integration into a carrier or module for direct replacement but are functionally equivalent.
Compliance: ROHS3 compliance and REACH unaffected status are consistent across all substitutes.
Parameter Comparison
| Parameter | PCF8564ACX9/1,005 | PCF8564AU/10AB/1,0 | DS1307Z+ | DS1338U-18+T&R | DS1338U-33+ | DS1339U-2+T&R | DS1340Z-3+ | DS1340Z-33+T&R | DS3232SN# | ISL12026IBZ-T | ISL12057IUZ-T |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | NXP USA Inc. | NXP USA Inc. | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Renesas Electronics Corporation | Renesas Electronics Corporation |
| Interface | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Voltage Supply Range | 1V ~ 5.5V | 1V ~ 5.5V | 4.5V ~ 5.5V | 1.71V ~ 5.5V | 3V ~ 5.5V | 1.8V ~ 5.5V | 2.7V ~ 5.5V | 2.97V ~ 5.5V | 2.3V ~ 5.5V | 2.7V ~ 5.5V | 1.8V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Alarm Feature | Yes | Yes | No | Yes | Yes | Yes | No | No | Yes | Yes | Yes |
| Leap Year Support | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Square Wave Output | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | No | No |
| Package Type | Die | Die | 8-SOIC | 8-TSSOP/8-MSOP | 8-TSSOP/8-MSOP | 8-TSSOP/8-MSOP | 8-SOIC | 8-SOIC | 20-SOIC | 8-SOIC | 8-TSSOP/8-MSOP |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitute - Same Manufacturer: PCF8564AU/10AB/1,0 is the direct NXP equivalent with identical electrical specifications and active product status. This part maintains all original features including alarm, leap year, square wave output, and watchdog timer functionality. Voltage supply range (1V ~ 5.5V) and operating temperature (-40°C ~ 85°C) are identical. The primary difference is packaging format (die vs. bulk), which does not affect functional compatibility.
Recommended Alternatives - Extended Feature Set: DS1338U-18+T&R and DS1338U-33+ from Analog Devices Inc./Maxim Integrated provide active product status with extended voltage supply range (1.71V ~ 5.5V and 3V ~ 5.5V respectively) and identical operating temperature range. Both include alarm, leap year, and square wave output features. These parts include NVSRAM (56B) not present in the original specification.
Low-Power Alternative: ISL12057IUZ-T from Renesas Electronics Corporation offers the lowest timekeeping current (0.65µA @ 1.8V) among substitutes. Operating voltage range is 1.8V ~ 3.6V, which is narrower than the original part. This substitute is suitable for ultra-low-power applications where the reduced voltage range is acceptable.
High-Integration Alternative: DS3232SN# from Analog Devices Inc./Maxim Integrated provides integrated TCXO/Crystal oscillator and expanded SRAM (236B), eliminating external crystal requirements. Operating voltage (2.3V ~ 5.5V) and temperature range (-40°C ~ 85°C) are compatible. This part is available in 20-SOIC package.
All substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can PCF8564AU/10AB/1,0 directly replace PCF8564ACX9/1,005 in existing designs?
A: Functionally yes, with packaging consideration. Both are NXP parts with identical electrical specifications, interface protocol, and feature set. The original part is die format; the substitute is bulk packaging. Direct die-to-die replacement requires the substitute to be integrated into a carrier or module matching the original die footprint and pinout.
Q: What is the key difference between DS1338U-18+T&R and DS1338U-33+?
A: Both are identical DS1338 base parts with different voltage supply specifications. DS1338U-18+T&R operates 1.71V ~ 5.5V; DS1338U-33+ operates 3V ~ 5.5V. Selection depends on minimum supply voltage requirement in the application. Both maintain -40°C ~ 85°C operating temperature and include 56B NVSRAM.
Q: Why does ISL12057IUZ-T have a narrower voltage range than the original part?
A: ISL12057IUZ-T is optimized for low-power operation (0.65µA @ 1.8V) with operating range 1.8V ~ 3.6V. This narrower range reflects the design focus on ultra-low-power applications. Selection of this substitute requires verification that the application's supply voltage remains within 1.8V ~ 3.6V.
Q: Are all substitutes I2C 2-Wire Serial compatible?
A: Yes. All listed substitutes use I2C 2-Wire Serial interface protocol identical to the original PCF8564ACX9/1,005. Protocol-level compatibility is maintained across all substitutes.
Q: Which substitute provides the closest feature match to the original part?
A: PCF8564AU/10AB/1,0 provides exact feature parity: alarm, leap year, square wave output, and watchdog timer. All other substitutes omit watchdog timer functionality. DS1338 and DS1339 series omit watchdog timer but add NVSRAM. ISL12026 and ISL12057 omit both watchdog timer and square wave output.
Q: What is the significance of active product status for substitutes?
A: All listed substitutes carry active product status, ensuring ongoing availability, manufacturing support, and compliance updates. The original PCF8564ACX9/1,005 is obsolete, making active substitutes necessary for long-term design support and procurement continuity.
Q: Can DS3232SN# be used in applications requiring external crystal oscillator?
A: DS3232SN# includes integrated TCXO/Crystal oscillator, eliminating the need for external crystal components. This reduces board space and component count compared to designs using external crystals. The integrated oscillator does not preclude use in applications designed for external crystals; the external crystal connection is simply not utilized.
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