Part A
83940DYILF
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 3437 PCS
- Package
- LQFP-32
- Series
- Horário-Horário - Clock Buffers, Drivers
Replacement verdict
Compatible functional replacement candidate
The 83940DY-01LF and 83940DYILF are functionally compatible clock fanout buffers with matching logic type, channel count, supply voltage, and package footprint. The 83940DYILF offers a wider industrial temperature range, making it a viable replacement candidate for the 83940DY-01LF in most applications, provided the extended temperature capability is acceptable and no application-specific configuration differences apply.
Output Type
High match
Channel Count
High match
Supply Voltage
High match
Operating Temperature
Validation required
Parts at a glance
Part B
83940DY-01LF
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 5782 PCS
- Package
- LQFP-32
- Series
- Horário-Horário - Clock Buffers, Drivers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 83940DY-01LF | 83940DYILF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics | Renesas Electronics | Same manufacturer ensures consistent design lineage and support. |
| Function | Clock fanout buffer / clock distribution | Clock fanout buffer / clock distribution | Identical core function is required for direct substitutability. |
| Package / Case | TSSOP-28 | TSSOP-28 | Same footprint allows drop-in replacement on existing PCB layouts. |
| Number of Outputs | 10 | 10 | Output count must match to preserve clock tree topology. |
| Supply Voltage | 3.3 V | 3.3 V | Matching supply voltage ensures electrical compatibility in the target system. |
| Operating Temperature Range | 0°C to +70°C | -40°C to +85°C | Industrial temperature range affects suitability for harsh or outdoor environments. |
| Grade / Suffix | Commercial grade | Industrial grade | Grade determines environmental robustness and reliability qualification. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting method is required for assembly compatibility. |
| RoHS Status | RoHS compliant | RoHS compliant | Both meet environmental regulations for lead-free manufacturing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 83940DYILF | 83940DY-01LF |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Type | Fanout Buffer (Distribution), Multiplexer | Fanout Buffer (Distribution), Multiplexer |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 2:18 | 2:18 |
| Differential - Input: Output | Yes/No | Yes/No |
| Input | CML, LVCMOS, LVPECL, LVTTL, SSTL | CML, LVCMOS, LVPECL, LVTTL, SSTL |
| Output | LVCMOS, LVTTL | LVCMOS, LVTTL |
| Frequency - Max | 250 MHz | 250 MHz |
| Voltage - Supply | 2.375V ~ 3.465V | 2.375V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 83940DY-01LF and 83940DYILF?
The 83940DY-01LF and 83940DYILF are both IDT (Integrated Device Technology, now Renesas) 3.3V zero-delay clock buffers from the 83940 family, packaged in a 32-pin TQFP (thin quad flat pack). They are designed to distribute low-skew clocks in systems requiring tight timing margins.
What is the difference between the 83940DY-01LF and 83940DYILF?
The primary difference is the operating temperature range. The 83940DY-01LF is specified for the commercial temperature range (0°C to +70°C), while the 83940DYILF is specified for the industrial temperature range (-40°C to +85°C). The "I" in the 83940DYILF part number denotes the industrial temperature grade.
Are the 83940DY-01LF and 83940DYILF functionally interchangeable?
Yes, both devices share the same functional architecture, pinout, and package (32-pin TQFP). They provide the same clock distribution function. The only difference is the guaranteed operating temperature range, so the 83940DYILF can be used in applications requiring the wider industrial range, while the 83940DY-01LF is limited to commercial temperatures.
What is the operating temperature range of each device?
The 83940DY-01LF operates from 0°C to +70°C (commercial grade). The 83940DYILF operates from -40°C to +85°C (industrial grade). These ranges are specified in the respective IDT/Renesas datasheets.
What is the package and pin count for these devices?
Both the 83940DY-01LF and 83940DYILF are offered in a 32-pin TQFP (thin quad flat pack) package. The package code "DY" in the part number indicates this package type.
What is the supply voltage for the 83940DY-01LF and 83940DYILF?
Both devices operate from a 3.3V nominal supply voltage (3.135V to 3.465V), as specified in the IDT 83940 datasheet. They are part of the 3.3V clock distribution family.
Can the 83940DY-01LF be substituted with the 83940DYILF in an existing design?
In most cases, yes, provided the application does not require operation below 0°C or above +70°C. The 83940DYILF is a higher-grade version that covers the commercial range as well. However, always verify that the industrial-grade device meets any other design-specific requirements, such as power consumption or timing, by consulting the manufacturer datasheet.
What is the function of the 83940 family clock buffers?
The 83940 family devices are zero-delay clock buffers that accept a reference clock input and distribute multiple low-skew outputs. They are used in applications such as networking, telecommunications, and computing systems where precise clock distribution is critical. The 83940DY-01LF and 83940DYILF specifically provide a fanout of 10 outputs with selectable input and output configurations.