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KS8995MAL
Electronics Part Number
KS8995MAL-WXManufacturer
Nuvoton Technology Corporation
KS8995MAL
Description
10/100 Integrated Switch IC, PQFP-128Inventory
581 Pcs New Original In Stock
10/100 integrated switch, 128-PQFP 14x20; integrated PHY; for network appliances.
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Minimum 1
Minimum 1
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Technical Specifications
Category
Interface, Voice Record and Playback
Manufacturer
Nuvoton Technology Corporation
Packaging
-
Operating Temperature
0°C ~ 70°C (TA)
Mounting Type
Through Hole
Package / Case
28-DIP (0.600", 15.24mm)
Series
ChipCorder®
Features
Auto Mute
Base Product Number
ISD4002
Product Status
Active
Voltage - Supply
2.7 V ~ 3.3 V
Duration
3 Min
Supplier Device Package
28-DIP
Interface
SPI
Output Signal
Analog - Single Ended
Input Signal
Analog - Differential
Sampling Frequency
5.3kHz
Filter Pass Band
2.3kHz
Messaging
Multiple
Oscillator Type
Internal/External
Data Sheet Document (D)
Datasheets
Download ISD4002-180PY Product Specification (PDF)
HTML Datasheet
ISD4002-180PY-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
I4218PY
Standard Package
15
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Frequently Asked Questions (FAQ)
When designing in the ISD4002-180PY, how can I ensure signal integrity when using long analog input
To maintain signal integrity with the ISD4002-180PY in noisy environments, use shielded twisted-pair cabling for analog differential inputs and keep trace lengths as short as possible. Add RC low-pass filtering (cutoff ~5kHz) near the ISD4002-180PY's AUD and INV AUD pins to suppress high-frequency noise without affecting the 5.3kHz sampling bandwidth. Route analog traces away from digital or switching signals, and ensure a solid ground plane under the ISD4002-180PY's analog section to minimize coupled interference. Avoid sharing power rails with high-current loads to prevent supply-induced distortion in recorded voice quality.
Can I replace a failing ISD4002-180PY with the AT24C64B-10SI-2.7 in an existing voice messaging circ
No, the AT24C64B-10SI-2.7 is not a functional replacement for the ISD4002-180PY—it is a 64K I²C EEPROM without voice recording, playback, or analog signal path support. The ISD4002-180PY includes an analog front-end, anti-aliasing/reconstruction filters, and SPI-controlled playback logic. Attempting substitution would require a complete redesign, including external DACs, amplifiers, and firmware. For drop-in alternatives, consider the ISD4003-180Y—same SPI interface, 28-DIP package, but with extended duration (up to 4 minutes). Always verify pin compatibility, voltage levels, and message management in legacy voice applications.
What are the risks of using an external crystal oscillator instead of the ISD4002-180PY's internal o
Using an external oscillator with the ISD4002-180PY offers tighter frequency stability but introduces risks: mismatched clock frequencies (e.g., >1% deviation) can stretch or compress playback duration and shift pitch, making speech unnatural. The ISD4002-180PY's internal oscillator is factory-trimmed for 5.3kHz sampling; external clocks must match within ±0.5%. Also, poor PCB layout of the external clock trace may couple noise into the analog supply, increasing THD. Use a low-jitter CMOS oscillator, place it near the ISD4002-180PY’s XCLK pin, and decouple with 100nF + 10μF to avoid artifacts in recorded voice output.
How does operating the ISD4002-180PY near the 2.7V lower supply limit impact audio output amplitude
Operating the ISD4002-180PY at 2.7V can reduce analog output swing by up to 15% compared to 3.3V, lowering speaker volume and signal-to-noise ratio. At low battery levels, this may require external amplification or automatic gain control. Additionally, internal regulator headroom decreases, increasing susceptibility to ripple from RF sections or motors. To mitigate, use a low-dropout voltage regulator (e.g., TLV70233) with high PSRR, monitor supply via a microcontroller ADC, and implement early warning for battery replacement. Avoid direct connection to lithium-primary cells without regulation to ensure stable operation over the ISD4002-180PY’s 0–70°C range.
What reliability concerns should I address when deploying ISD4002-180PY-based systems in field appli
The ISD4002-180PY uses multi-level analog storage with no wear-leveling, so repeated playback does not degrade memory—but repeated recording cycles do. If your application involves frequent re-recording, limit writes to <10,000 cycles (per datasheet endurance spec) to avoid cell leakage or noise buildup. For long-term reliability, avoid thermal cycling extremes; keep ambient temperature below 60°C to prevent diffusion in floating-gate structures. Also, protect the SPI interface with TVS diodes (e.g., SMAJ3.3A) on SCLK and MOSI lines to prevent ESD damage in service. Design with margin: use a preamp with soft clipping to avoid overdriving ISD4002-180PY's input and distorting stored samples.
When designing in the ISD4002-180PY, how can I ensure signal integrity when using long analog input
To maintain signal integrity with the ISD4002-180PY in noisy environments, use shielded twisted-pair cabling for analog differential inputs and keep trace lengths as short as possible. Add RC low-pass filtering (cutoff ~5kHz) near the ISD4002-180PY's AUD and INV AUD pins to suppress high-frequency noise without affecting the 5.3kHz sampling bandwidth. Route analog traces away from digital or switching signals, and ensure a solid ground plane under the ISD4002-180PY's analog section to minimize coupled interference. Avoid sharing power rails with high-current loads to prevent supply-induced distortion in recorded voice quality.
Can I replace a failing ISD4002-180PY with the AT24C64B-10SI-2.7 in an existing voice messaging circ
No, the AT24C64B-10SI-2.7 is not a functional replacement for the ISD4002-180PY—it is a 64K I²C EEPROM without voice recording, playback, or analog signal path support. The ISD4002-180PY includes an analog front-end, anti-aliasing/reconstruction filters, and SPI-controlled playback logic. Attempting substitution would require a complete redesign, including external DACs, amplifiers, and firmware. For drop-in alternatives, consider the ISD4003-180Y—same SPI interface, 28-DIP package, but with extended duration (up to 4 minutes). Always verify pin compatibility, voltage levels, and message management in legacy voice applications.
What are the risks of using an external crystal oscillator instead of the ISD4002-180PY's internal o
Using an external oscillator with the ISD4002-180PY offers tighter frequency stability but introduces risks: mismatched clock frequencies (e.g., >1% deviation) can stretch or compress playback duration and shift pitch, making speech unnatural. The ISD4002-180PY's internal oscillator is factory-trimmed for 5.3kHz sampling; external clocks must match within ±0.5%. Also, poor PCB layout of the external clock trace may couple noise into the analog supply, increasing THD. Use a low-jitter CMOS oscillator, place it near the ISD4002-180PY’s XCLK pin, and decouple with 100nF + 10μF to avoid artifacts in recorded voice output.
How does operating the ISD4002-180PY near the 2.7V lower supply limit impact audio output amplitude
Operating the ISD4002-180PY at 2.7V can reduce analog output swing by up to 15% compared to 3.3V, lowering speaker volume and signal-to-noise ratio. At low battery levels, this may require external amplification or automatic gain control. Additionally, internal regulator headroom decreases, increasing susceptibility to ripple from RF sections or motors. To mitigate, use a low-dropout voltage regulator (e.g., TLV70233) with high PSRR, monitor supply via a microcontroller ADC, and implement early warning for battery replacement. Avoid direct connection to lithium-primary cells without regulation to ensure stable operation over the ISD4002-180PY’s 0–70°C range.
What reliability concerns should I address when deploying ISD4002-180PY-based systems in field appli
The ISD4002-180PY uses multi-level analog storage with no wear-leveling, so repeated playback does not degrade memory—but repeated recording cycles do. If your application involves frequent re-recording, limit writes to <10,000 cycles (per datasheet endurance spec) to avoid cell leakage or noise buildup. For long-term reliability, avoid thermal cycling extremes; keep ambient temperature below 60°C to prevent diffusion in floating-gate structures. Also, protect the SPI interface with TVS diodes (e.g., SMAJ3.3A) on SCLK and MOSI lines to prevent ESD damage in service. Design with margin: use a preamp with soft clipping to avoid overdriving ISD4002-180PY's input and distorting stored samples.
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Sep 15 2026
