ICS291PGT Clock/Frequency Synthesizer Equivalent & Substitute Parts

Part Overview

The ICS291PGT is a Clock/Frequency Synthesizer IC manufactured by Renesas Electronics Corporation, designed for 200MHz operation in a 20-TSSOP surface mount package. This component integrates a Phase-Locked Loop (PLL) with bypass capability, supporting both clock and crystal inputs with CMOS output configuration.

The ICS291PGT is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term production requirements for applications utilizing this clock synthesis function.

Key Parameters

Parameter	Value
Frequency - Max	200MHz
Voltage - Supply	3.135V ~ 3.465V
Operating Temperature	0°C ~ 70°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Type	Clock/Frequency Synthesizer
PLL Configuration	Yes with Bypass
Input Type	Clock, Crystal
Output Type	CMOS
Ratio - Input:Output	1:6
Divider/Multiplier	Yes/Yes
Number of Circuits	1
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the ICS291PGT is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Maximum Frequency: 200MHz
Supply Voltage Range: 3.135V ~ 3.465V
Operating Temperature Range: 0°C ~ 70°C
Package Type: 20-TSSOP (0.173", 4.40mm Width)
Functional Type: Clock/Frequency Synthesizer with PLL and Bypass
Input Configuration: Clock and Crystal support
Output Configuration: CMOS
Input:Output Ratio: 1:6
Divider/Multiplier Capability: Yes/Yes

The substitute part 291PGLFT meets all mandatory matching parameters, confirming direct functional and electrical equivalence for the ICS291PGT application.

Parameter Comparison

Parameter	ICS291PGT (Main Part)	291PGLFT (Substitute)	Match Status
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	Match
Category	Clock/Timing	Clock/Timing	Match
Type	Clock/Frequency Synthesizer	Clock/Frequency Synthesizer	Match
Series	VersaClock®	VersaClock®	Match
Frequency - Max	200MHz	200MHz	Match
Voltage - Supply	3.135V ~ 3.465V	3.135V ~ 3.465V	Match
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Match
Package / Case	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	Match
PLL Configuration	Yes with Bypass	Yes with Bypass	Match
Input Type	Clock, Crystal	Clock, Crystal	Match
Output Type	CMOS	CMOS	Match
Ratio - Input:Output	1:6	1:6	Match
Divider/Multiplier	Yes/Yes	Yes/Yes	Match
Number of Circuits	1	1	Match
Mounting Type	Surface Mount	Surface Mount	Match
Product Status	Obsolete	Active	Upgrade
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Upgrade

Engineering Selection Recommendations

The 291PGLFT represents a direct functional equivalent to the ICS291PGT with significant compliance advantages. Both parts share identical electrical specifications, frequency performance, supply voltage requirements, operating temperature range, and package configuration.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The ICS291PGT carries obsolete status, indicating discontinued manufacturing and limited long-term availability. The 291PGLFT maintains active product status with current manufacturing support.

From a compliance perspective, the 291PGLFT achieves ROHS3 compliance, whereas the ICS291PGT is RoHS non-compliant. This compliance upgrade aligns with current environmental and regulatory requirements for electronic component procurement.

Both parts maintain identical REACH and ECCN classifications, confirming equivalent regulatory treatment for export and supply chain purposes.

Frequently Asked Questions (FAQ)

Q: Can the 291PGLFT directly replace the ICS291PGT in existing designs?

A: Yes. The 291PGLFT provides direct functional replacement. All electrical parameters, frequency specifications, supply voltage requirements, operating temperature range, and package configuration are identical. Pin-to-pin compatibility is maintained within the 20-TSSOP package.

Q: What is the significance of the product status difference between these parts?

A: The ICS291PGT is classified as obsolete, indicating Renesas has discontinued manufacturing. The 291PGLFT maintains active status with ongoing production support. For new designs or long-term production requirements, the 291PGLFT ensures sustained component availability.

Q: Does the RoHS3 compliance of the 291PGLFT affect electrical performance?

A: No. RoHS3 compliance reflects manufacturing process and material composition standards, not electrical performance. The 291PGLFT delivers identical electrical specifications and frequency performance as the ICS291PGT.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts utilize the identical 20-TSSOP (0.173", 4.40mm Width) package with matching pinout configuration. No PCB layout modifications are required for substitution.

Q: What input and output configurations are supported by the 291PGLFT?

A: The 291PGLFT supports Clock and Crystal inputs with CMOS output configuration, identical to the ICS291PGT. The 1:6 input-to-output ratio and integrated divider/multiplier functionality are preserved.

Q: Is the PLL bypass capability maintained in the 291PGLFT?

A: Yes. The 291PGLFT includes PLL with bypass capability, matching the ICS291PGT configuration. This feature enables flexible clock synthesis operation across various application requirements.

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