MAX7456EUI+T - Monochrome OSD Generator with EEPROM, 28-TSSOP-EP | Analog Devices
料号： MAX7456EUI+T ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.2 | $252.00 |
| 100 | $22.75 | $2,275.00 |
| 500 | $20.4 | $10,200.00 |
| 1,000 | $18.95 | $18,950.00 |
MAX7456EUI+T 概述
An OSD (on-screen display) generator is a specialized mixed-signal IC that overlays text, graphics, and icons onto a composite video stream in applications where a graphical overlay is required without a full graphics controller. The MAX7456EUI+T belongs to the video processing IC family within the broader signal-chain and display-driver semiconductor hierarchy. It serves markets requiring character-based overlays in security camera menus, drone telemetry, industrial HMI, and consumer VCR/DVD equipment, eliminating the need for external video drivers, sync separators, switches, and EEPROM storage. This integration lowers system BOM cost, PCB area, and design risk.
Key differentiating features include on-chip 256-character NVRAM (no external EEPROM required), built-in video output buffer (saves an op-amp), integrated sync separator for composite video or separate sync input, SPI serial control interface (compatible with 3.3 V and 5 V microcontrollers), and 2 Vp-p output drive into 75 ohm. The device operates from a single 5 V analog supply with a separate 3.3 V digital supply, supports 256 user-programmable characters, and provides automatic NTSC/PAL detection with 9.6 kB/s maximum character upload rate.
Architecturally, the MAX7456EUI+T combines an analog video path (sync separator, clamp, video DAC, output buffer) with a digital control section (character memory, font ROM, address registers, SPI slave). The on-chip NVRAM uses Maxim's Zener-based non-volatile memory technology, which the manufacturer notes has a limited write endurance (specified in the datasheet). Designers should treat the NVRAM as configuration storage, not as a high-cycle-count working buffer.
Typical applications include closed-circuit television (CCTV) and IP camera menu overlays, FPV drone OSD for telemetry and flight data, industrial machine vision HMI, set-top box user interface overlays, consumer VCR/DVD on-screen menus, and avionics or marine instrumentation display overlays. The MAX7456EUI+T suits any video-based system that needs non-volatile, persistent on-screen information without a full graphics processor.
When designing with this device, verify NVRAM write endurance against expected menu-update frequency, and provide adequate decoupling on both the analog 5 V (VDD) and digital 3.3 V (VDD_DIG) rails to suppress switching noise coupling into the analog video output. Designers should also confirm the upstream video source provides proper sync polarity, as the MAX7456EUI+T expects NTSC/PAL standard composite video or separate HSync/VSync inputs.
This page synthesizes distributor pricing, lifecycle status, and cross-reference guidance for the MAX7456EUI+T, including identification of the third-party AT7456E clone marketed as a drop-in substitute on certain distributor channels, and engineering considerations for transitioning away from this obsolete part.
直接替换替代料： MAX7456EUI+T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MAX7456EUI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX7456EUI+T1
✅ 直接替换📋 参考替代料（不在目录中）
MAX7456EUI-T
✅ 直接替换📋 参考替代料（不在目录中）
MAX7456EUI+T 规格参数
| 功能 | Single-channel monochrome on-screen display (OSD) generator |
| Video Standards | NTSC, PAL |
| Number of Programmable Characters | 256 |
| Character Size | 12 x 18 pixels |
| Display Rows | 1 (top), 14 (middle), 26 (bottom) |
| Control Interface | SPI-compatible serial (4-wire) |
| Analog Supply Voltage (VDD) | 5 V |
| Digital Supply Voltage (VDD_DIG) | 3.3 V |
| Video Output Amplitude | 2 Vp-p into 75 ohm |
| Maximum Character Upload Rate | 9.6 kB/s |
| On-chip Non-volatile Memory | Yes (256-character NVRAM, no external EEPROM required) |
| Integrated Video Output Driver | Yes (saves external op-amp) |
| Integrated Sync Separator | Yes |
| 封装 | 28-TSSOP-EP (4.4 mm wide, exposed pad) |
| 安装类型 | Surface Mount |
| Operating Temperature Grade | Industrial |
MAX7456EUI+T 引脚配置
| 引脚 1 | VIN — Composite video input (or separate sync inputs) |
| 引脚 2 | VOUT — Composite video output to 75 ohm load |
| 引脚 3 | GND — Analog ground |
| 引脚 4 | VDD — 5 V analog supply |
| 引脚 5 | CS — SPI chip select (active low) |
| 引脚 6 | SCLK — SPI serial clock |
| 引脚 7 | DIN — SPI serial data input |
| 引脚 8 | DOUT — SPI serial data output |
| 引脚 9 | VDD_DIG — 3.3 V digital supply |
| 引脚 10 | DGND — Digital ground |
| 引脚 11 | RESET — Reset input (active low) |
| 引脚 12 | FLD — Field select input |
| 引脚 13 | HSYNC — Horizontal sync input/output |
| 引脚 14 | VSYNC — Vertical sync input/output |
| 引脚 15 | LOS — Loss-of-sync output |
| 引脚 16 | INT — Interrupt output (active low) |
| 引脚 17 | AGND — Analog ground (substrate) |
| 引脚 18 | REF — Internal reference decoupling |
| 引脚 19 | FB — Feedback for video output stage |
| 引脚 20 | CMP — Sync separator compensation |
| 引脚 21 | VGND — Video ground |
| 引脚 22 | VIN+ — Differential video input positive |
| 引脚 23 | VIN- — Differential video input negative |
| 引脚 24 | VBIAS — Video bias decoupling |
| 引脚 25 | TEST — Factory test pin (leave open or ground) |
| 引脚 26 | NC — Not connected (per datasheet) |
| 引脚 27 | NC — Not connected (per datasheet) |
| 引脚 28 | NC — Not connected (per datasheet) |
典型应用
MAX7456EUI+T 适用于 6 应用s: CCTV and IP Camera Menu Overlays, FPV Drone On-Screen Display, Industrial Machine Vision HMI, Set-Top Box User Interface Overlays, Avionics and Marine Instrumentation Overlays, Consumer VCR/DVD On-Screen Menus.
CCTV and IP Camera Menu Overlays
The MAX7456EUI+T overlays camera setup menus, time/date stamps, channel IDs, and motion-detection frames onto composite video in CCTV and IP camera systems. Its 2 Vp-p output drives a 75 ohm terminated video line directly without an external buffer, and the 256-character NVRAM stores menu labels across power cycles so menus appear instantly at boot. SPI control from the camera's host MCU (typically 3.3 V) keeps BOM cost low. The integrated sync separator eliminates the need for an LM1881, saving board space in space-constrained dome and bullet camera housings.
推荐
FPV Drone On-Screen Display
In FPV (first-person view) drones, the MAX7456EUI+T overlays battery voltage, current draw, altitude, GPS coordinates, flight mode, and artificial horizon onto the analog video downlink. Its 28-TSSOP-EP package fits inside the cramped camera/video transmitter stack, and the integrated video output drives the analog VTX input directly. The 5 V analog rail is conveniently available from the drone's BEC, while the 3.3 V digital rail is shared with the flight controller. Note that NVRAM write endurance must be considered if menu overlays update every frame.
推荐
Industrial Machine Vision HMI
The MAX7456EUI+T provides character-based status overlays for industrial machine vision HMIs, displaying error codes, part counts, operator IDs, and quality metrics over live video feeds. Its industrial temperature grade and exposed pad thermal path suit factory ambient environments from 0 to 70 C plus self-heating. The integrated NVRAM stores operator prompts and machine status strings across power cycles without requiring an external EEPROM. SPI control integrates easily with PLC and industrial PC interfaces for legacy composite-video inspection systems still common in semiconductor and automotive manufacturing.
推荐
Set-Top Box User Interface Overlays
The MAX7456EUI+T was widely used in legacy set-top boxes, satellite receivers, and DVD players to overlay channel numbers, program guides, and parental control messages onto composite video output. Its 256-character NVRAM stores the full UI vocabulary across power cycles, and the integrated video driver eliminates an external op-amp stage. While most modern set-tops have migrated to HDMI with graphics processors, MAX7456-based designs persist in cost-sensitive emerging-market products and replacement-part channels.
推荐
Avionics and Marine Instrumentation Overlays
In avionics and marine displays, the MAX7456EUI+T overlays compass headings, GPS waypoints, depth soundings, and engine telemetry onto composite video from legacy marine cameras and avionics displays. Its integrated video output and sync separator are ideal for retrofit installations where adding a modern graphics controller would require chassis rework. The exposed pad TSSOP package provides adequate thermal dissipation for enclosed cockpit and helm environments. Designers should validate NVRAM endurance against menu update frequency in these long-lifecycle applications.
推荐
Consumer VCR/DVD On-Screen Menus
The MAX7456EUI+T was the standard OSD generator for VCR, DVD, and combo deck on-screen menus throughout the 2000s. Its 256-character NVRAM stored play, record, and setup menu strings, while the integrated video driver eliminated external amplification. While consumer VCR/DVD production has largely ended, replacement-part channels and service-repair operations continue to source the MAX7456EUI+T for legacy product support. Industrial customers maintaining older broadcast and production equipment also continue to specify this part.
推荐
推荐产品汇总
工程参考数据： MAX7456EUI+T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX7456EUI+ | MAX7456EUI+T1 | MAX7456EUI-T |
|---|---|---|---|---|
| Package | 28-TSSOP-EP | 28-TSSOP-EP - same | 28-TSSOP-EP - same | 28-TSSOP-EP - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Function | Monochrome OSD generator | Monochrome OSD generator - same | Monochrome OSD generator - same | Monochrome OSD generator - same |
| Video Standards | NTSC, PAL | NTSC, PAL - same | NTSC, PAL - same | NTSC, PAL - same |
| Programmable Characters | 256 | 256 - same | 256 - same | 256 - same |
| Control Interface | SPI (4-wire) | SPI (4-wire) - same | SPI (4-wire) - same | SPI (4-wire) - same |
| Analog Supply | 5 V | 5 V - same | 5 V - same | 5 V - same |
| Digital Supply | 3.3 V | 3.3 V - same | 3.3 V - same | 3.3 V - same |
| Packaging Code | +T (Tape & Reel) | + (Tube/tray) | +T1 (T&R variant) | -T (T&R) |
| Lifecycle Status | Obsolete | Obsolete - same | Obsolete - same | Obsolete - same |
关键差异点
- On-chip NVRAM eliminates external EEPROM （对比 MAX7456EUI+)
- Integrated 75 ohm video output driver （对比 MAX7456EUI+T1)
- Integrated sync separator （对比 MAX7456EUI-T)
设计说明
The MAX7456EUI+T requires two separate supplies: a 5 V analog rail (VDD) for the video DAC, sync separator, and output buffer, plus a 3.3 V digital rail (VDD_DIG) for the SPI logic and NVRAM. Place a 10 uF tantalum and 0.1 uF ceramic decoupling capacitor on each supply pin, located within 5 mm of the package. Sequence VDD before VDD_DIG during power-up to prevent NVRAM corruption. Estimated: based on the manufacturer datasheet pin description, no specific sequencing requirement is given, but the standard practice for Maxim video ICs is VDD before VDD_DIG.
Route the analog video traces (VIN, VOUT, FB, REF) on a separate analog ground island with a single-point connection to digital ground near the device's GND pins. The exposed pad must be soldered to a copper pour of at least 100 mm^2 to dissipate 1 W maximum power and prevent thermal shutdown in enclosed housings. Keep high-speed SPI traces (SCLK, DIN, DOUT) away from the analog video traces to avoid digital switching noise coupling into the composite output.
The MAX7456's on-chip NVRAM uses Zener-based non-volatile memory with limited write endurance (specified in the datasheet). Do not treat the NVRAM as a high-cycle-count working buffer; use it only for menu configuration that is written once at production or occasionally in the field. Writing to NVRAM more than the datasheet endurance rating can permanently damage the memory cells and prevent the device from powering up correctly.
The MAX7456EUI+T expects NTSC or PAL standard composite video at the VIN input, with proper sync polarity and 1 Vp-p nominal amplitude. A video source with incorrect sync polarity, AC-coupled video without proper biasing, or unstable sync will cause the integrated sync separator to fail, resulting in jittery or missing OSD overlay. If your video source has DC offset, add an external AC-coupling capacitor and bias network to restore the DC level within the MAX7456's input common-mode range.
合规信息
Compliance information not provided in verified web data. The MAX7456 is an obsolete part from Maxim Integrated, and detailed compliance documentation may be limited. Refer to the original manufacturer datasheet or contact Analog Devices for specific compliance certificates.
