Analog Devices Inc./Maxim Integrated MAX9955BDCCB+D

Overview

The MAX9955BDCCB+D from Maxim Integrated is a high-speed dual comparator/terminator IC designed for automated test equipment (ATE) signal conditioning. It integrates two independent comparators with programmable cable-droop compensation, 55ps input rise/fall time, 190ps minimum pulse width, and dual 50Ω buffered terminators per channel-enabling precise timing capture in DDR3/GDDR4 memory ATE systems.

For engineers reviewing the MAX9955BDCCB+D datasheet, MAX9955BDCCB+D pinout, MAX9955BDCCB+D application, or MAX9955BDCCB+D equivalent, key selection criteria include its -1.1V to +3.6V comparator input range, ±50mA terminator overcurrent protection, die temperature monitoring output, and compatibility with doubly terminated 0.4V_P-P CML interfaces.

Technical Context

The MAX9955BDCCB+D implements two fully independent comparator channels, each with differential open-collector outputs, internal 50Ω termination resistors, and separate high/low reference inputs (CHV_/CLV_). Each channel includes dedicated cable-droop compensation inputs (COS_/COL_) with fixed 50ps and 1.5ns time constants for high- and low-frequency peaking.

Its integrated terminator buffers accept DTV_ reference voltage and deliver 50Ω source impedance with ±50mA current limiting and latched OVL flag indication. The device uses bipolar process technology, features an exposed die paddle thermally connected to VEE, and supports die temperature monitoring via the TEMP pin with 10mV/°C slope and 3.52V nominal output at +70°C.

Key Specifications

Pinout & Package

MAX9955BDCCB+D is housed in a 64-pin TQFP-IDP (inverted die paddle) package measuring 10mm × 10mm with 0.5mm pitch. The top-side exposed paddle is internally connected to VEE and provides enhanced thermal dissipation for high-power ATE operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed comparator/terminator applications.

Compared with MAX9955BDCCB+D, the MAX9957ETL+ offers identical timing performance and thermal monitoring but trades dual independent DUT inputs for input multiplexing-while the LMH7322MA/NOPB lacks integrated termination, cable compensation, and die temperature sensing entirely, requiring significant external support circuitry for ATE use.

Availability

MAX9955BDCCB+D is available at Aetrix Electronics and suitable for high-performance memory ATE, SOC test equipment, and parametric memory characterization systems requiring stable component supply, guaranteed long-term availability, and traceable sourcing.

Supply support for MAX9955BDCCB+D 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for test and measurement, communications, and industrial applications.

The MAX9955BDCCB+D belongs to Maxim's high-speed ATE interface product line, engineered specifically for automated memory test systems requiring sub-nanosecond timing accuracy, integrated signal conditioning, and thermal-aware operation.

FAQ

What is the operating temperature range for the MAX9955BDCCB+D die junction?

The MAX9955BDCCB+D is specified for internal die temperature operation from +50°C to +90°C. Its integrated TEMP pin provides a calibrated analog voltage (3.52V nominal at +70°C, +10mV/°C slope) to monitor actual junction temperature in real time-critical for thermal derating in high-density ATE loadboards where ambient cooling is limited.

How does the MAX9955BDCCB+D implement cable-droop compensation?

The MAX9955BDCCB+D implements cable-droop compensation using two independent analog inputs per channel: COS_ (short-duration boost, 50ps time constant) and COL_ (long-duration boost, 1.5ns time constant). These inputs adjust peaking amplitude in the DUT_ signal path to counteract high-frequency loss in test cables-verified to restore waveform fidelity in 2-meter RG174 configurations as shown in typical operating characteristics.

What is the function of the OVL pin on the MAX9955BDCCB+D?

The OVL pin on the MAX9955BDCCB+D is an open-drain overcurrent flag that latches high when either channel's terminator buffer exceeds ±50mA output current. It remains asserted until the RST pin is pulsed low, which resets the latch and closes the buffer output switch-providing fail-safe current limiting for protection of DUT and tester hardware during abnormal test conditions.

Can the MAX9955BDCCB+D be used with CML logic families?

Yes, the MAX9955BDCCB+D is explicitly designed for compatibility with doubly terminated 0.4V_P-P CML interfaces. Its differential open-collector comparator outputs (CH_/NCH_, CL_/NCL_) feature internal 50Ω termination to VCCOH_/VCCOL_, delivering nominal 800mV_P-P swing-halving to 400mV_P-P when paired with external 50Ω destination termination, matching standard CML receiver thresholds.

What package type and thermal features does the MAX9955BDCCB+D use?

The MAX9955BDCCB+D uses a 64-pin TQFP-IDP (inverted die paddle) package (10mm × 10mm, 0.5mm pitch) with an exposed paddle on the top surface. This paddle is internally connected to VEE and serves as the primary thermal path-enabling efficient heat removal in high-power ATE applications where static power dissipation reaches 850mW per channel at 2Gbps.