Part A
83940DYILF
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 3437 個数
- Package
- LQFP-32
- Series
- クロックタイミング - クロックバッファ、ドライバ
Replacement verdict
Compatible functional replacement candidate
The 83940DYI-01LF is a functionally compatible replacement candidate for the 83940DYILF, sharing the same device family, package, and core clock distribution architecture. Both parts are pin-to-pin compatible and differ only in specified output frequency range and AC timing characteristics. Designers should validate the target operating frequency and jitter budget against the specific application requirements before substituting.
Package Type
High match
Pin Configuration
High match
Output Frequency Range
Validation required
AC Timing Characteristics
Validation required
Parts at a glance
Part B
83940DYI-01LF
ルネサス エレクトロニクス アメリカ株式会社
- Lifecycle
- Active
- Stock
- 3459 個数
- Package
- LQFP-32
- Series
- クロックタイミング - クロックバッファ、ドライバ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 83940DYILF | 83940DYI-01LF | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics America Inc | Renesas Electronics America Inc | Same manufacturer ensures consistent quality, support, and documentation for both parts. |
| Series | 83940 | 83940 | Belonging to the same product series indicates shared architecture and similar application targets. |
| Package / Case | 32-LQFP | 32-LQFP | Identical package allows drop-in replacement on the same PCB footprint without layout changes. |
| Supplier Device Package | 32-LQFP (7x7) | 32-LQFP (7x7) | Same body size and lead pitch ensure mechanical compatibility in existing designs. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting method is required for assembly compatibility on the target board. |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | Matching industrial temperature range ensures both parts work in the same environmental conditions. |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V | Identical supply range means the same power rail can drive either device without modification. |
| Number of Circuits | 1 | 1 | Same circuit count confirms equivalent channel capacity for the target application. |
| Output Type | LVCMOS, LVTTL | LVCMOS, LVTTL | Matching output logic levels ensure interoperability with downstream components. |
| Input Type | LVCMOS, LVTTL | LVCMOS, LVTTL | Same input thresholds allow the same upstream driver to feed either device. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 83940DYILF | 83940DYI-01LF |
|---|---|---|
| Supplier | - | Flip Electronics,Renesas Electronics America Inc |
| 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 | LVCMOS, LVPECL, LVTTL, SSTL |
| Output | LVCMOS, LVTTL | LVCMOS, LVTTL |
| Frequency - Max | 250 MHz | 175 MHz |
| Voltage - Supply | 2.375V ~ 3.465V | 2.375V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the 83940DYILF and the 83940DYI-01LF?
The 83940DYILF and 83940DYI-01LF are both IDT (now Renesas) 3.3V LVCMOS clock fanout buffers in a 32-lead LQFP package. The primary difference is the device configuration variant: the 83940DYI-01LF is a factory-programmed or configuration-specific version of the base 83940DYILF, with a different default output enable/disable state or output configuration. Designers must consult the respective datasheets to confirm the exact configuration differences before substituting one for the other.
Are the 83940DYILF and 83940DYI-01LF pin-to-pin compatible?
Yes. Both devices are offered in the same 32-lead LQFP package with the same pinout. However, pin-to-pin compatibility does not guarantee functional equivalence, because the internal configuration and default output states may differ between the two variants.
What is the operating supply voltage for these devices?
Both the 83940DYILF and 83940DYI-01LF operate from a 3.3V nominal supply (VDD = 3.3V ± 5%), consistent with the IDT 83940 family of LVCMOS clock fanout buffers.
How many outputs do the 83940DYILF and 83940DYI-01LF provide?
Both devices are 1-to-16 LVCMOS clock fanout buffers, providing 16 single-ended LVCMOS outputs from a single input. This makes them suitable for clock distribution in systems requiring multiple synchronized clock loads.
Can the 83940DYI-01LF be used as a drop-in replacement for the 83940DYILF?
Not necessarily. Although both share the same package and pinout, the "-01" suffix indicates a different configuration variant. The default output enable states, output polarity, or other programmable features may differ. A drop-in replacement is only valid after verifying that the configuration of the 83940DYI-01LF matches the requirements of the 83940DYILF in the target design.
What is the maximum operating frequency of these clock buffers?
The 83940 family is specified for operation up to 250 MHz, depending on supply voltage, load conditions, and output configuration. Designers should verify the maximum frequency in the specific device datasheet under their actual operating conditions.
What package type do the 83940DYILF and 83940DYI-01LF use?
Both devices are housed in a 32-lead LQFP (Low-profile Quad Flat Package), designated by the "LF" suffix in the part number, which also indicates Pb-free (RoHS-compliant) construction.
Are the 83940DYILF and 83940DYI-01LF RoHS compliant?
Yes. The "LF" suffix in both part numbers indicates Pb-free, RoHS-compliant packaging, consistent with Renesas/IDT environmental specifications for these devices.