Renesas 87004AGLF

Overview

87004AGLF from Integrated Device Technology (IDT) is a 1:4 differential-to-LVCMOS/LVTTL zero delay clock generator with fully integrated PLL, supporting input/output frequencies from 15.625 MHz to 250 MHz, 4 LVCMOS/LVTTL outputs (Q0–Q3), and selectable differential inputs (CLK0/nCLK0 or CLK1/nCLK1). It enables precise clock regeneration in telecom line cards and network switches requiring low-jitter timing distribution.

For engineers reviewing the 87004AGLF datasheet, 87004AGLF pinout, 87004AGLF application, or 87004AGLF equivalent, this page delivers verified technical context, pin-level design meaning, real-world application mappings, and validated alternative options for clock tree design, PLL bypass validation, and zero-delay buffer implementation.

Technical Context

The 87004AGLF implements a fully integrated PLL with external feedback path (FB_IN) to achieve true zero-delay clock regeneration - aligning output edges with input reference edges within ±125 ps static phase offset. Its dual differential input pairs accept LVPECL, LVDS, LVHSTL, HCSL, and SSTL signals, while internal bias on nCLK0/nCLK1 enables single-ended LVCMOS/LVTTL operation on CLK0/CLK1.

Programmable dividers (reference, feedback, output) support eight discrete output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8, and ×2/×4/×8 multiplication modes. The PLL_SEL pin provides hardware-controlled PLL bypass for deterministic system debug, routing reference clock directly to output dividers without PLL latency.

Key Specifications

Pinout & Package

87004AGLF is housed in a 24-lead TSSOP (G package), 7.8 mm × 4.4 mm × 0.925 mm body, RoHS-compliant lead-free construction. Pin assignments follow JEDEC MO-153 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock generator applications.

Compared with 87004AGLF, the ICS87002AGLF reduces output count and control granularity but retains identical timing performance and pin-compatible layout; the Si5332A-D-GM offers superior jitter and programmability at the cost of added firmware dependency and non-pin-compatible integration.

Availability

87004AGLF is available at Aetrix Electronics and suitable for telecom infrastructure, network switching, and FPGA-based instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant lead-free packaging.

Supply support for 87004AGLF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The 87004AGLF belongs to IDT's HiPerClockS® family - engineered specifically for high-performance clock distribution in telecom, datacom, and test equipment where deterministic zero-delay regeneration, low jitter, and hardware configurability are mandatory.

FAQ

What is the maximum output frequency supported by the 87004AGLF?

The 87004AGLF supports an output frequency range of 15.625 MHz to 250 MHz, as specified in both AC Characteristics tables (Tables 5A and 5B) under fMAX parameter. This range applies across both 3.3 V and 2.5 V supply configurations and covers common telecom and networking rates including 125 MHz for 10G Ethernet and 250 MHz for high-speed FPGA interfaces. Operation beyond 250 MHz is not guaranteed.

Does the 87004AGLF require an external crystal or oscillator?

No, the 87004AGLF does not require an external crystal or oscillator. It is a PLL-based zero-delay clock generator that uses an external reference clock applied to CLK0/nCLK0 or CLK1/nCLK1 inputs. The device contains a fully integrated VCO (250–500 MHz) and relies on external feedback (FB_IN) for phase alignment - no crystal, TCXO, or XO is needed for basic operation.

How is zero-delay functionality achieved in the 87004AGLF?

Zero-delay functionality in the 87004AGLF is achieved through external feedback: the FB_IN pin must be connected to one of the Q0–Q3 outputs, closing the PLL loop so the phase detector compares input clock edges against regenerated output edges. This configuration minimizes static phase offset to ±125 ps and eliminates cumulative propagation delay - confirmed in the General Description and Block Diagram sections of the datasheet.

Can the 87004AGLF operate with both 3.3 V and 2.5 V supplies simultaneously?

Yes, the 87004AGLF supports independent 3.3 V ±5% or 2.5 V ±5% supplies on VDD (core), VDDA (analog), and VDDO (output) pins. DC Electrical Characteristics Tables 4A and 4B explicitly define parameters for both voltage levels, and the device can mix supplies - e.g., 3.3 V on VDD/VDDA and 2.5 V on VDDO - to match downstream logic I/O standards while maintaining PLL stability.

What is the purpose of the PLL_SEL pin on the 87004AGLF?

The PLL_SEL pin on the 87004AGLF controls whether the internal PLL is active or bypassed. When PLL_SEL = HIGH, the PLL is enabled and performs jitter attenuation and frequency translation. When PLL_SEL = LOW, the reference clock is routed directly to the output dividers (bypass mode), providing deterministic, low-latency clock distribution without PLL lock time or phase transients - essential for system debug and timing margin validation.