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NXP USA Inc. MC44BS374T1AEFR2
- Part No.:
- MC44BS374T1AEFR2
- Manufacturer:
- NXP USA Inc.
- Category:
- Specialized ICs
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Description:
- IC NTSC/PAL MODULATOR 16SOIC
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
MC44BS374T1AEFR2 - PLL-Tuned Audio/Video RF Modulator
The MC44BS374T1A family integrates a programmable RF oscillator, PLL, sound subcarrier and audio/video modulation for legacy television-output equipment. This customer record identifies the AEF variant with an R2 ordering suffix in a 16-pin SOIC package.
Manufacturer family data and a later NXP legacy-part cross-reference support the base device; verify the complete ordering suffix against device markings and original purchasing documentation.
Overview
The MC44BS374T1A accepts baseband video and audio and produces a modulated RF television output. Its integrated VCO and programmable RF PLL set the output channel through a high-speed I2C-compatible interface. A second PLL selects the sound subcarrier. The family supports multiple broadcast-system configurations using the same basic external circuit.
Key Advantages
On-chip UHF oscillator and PLL reduce external tuned components.
Selectable 4.5, 5.5, 6.0 and 6.5 MHz sound subcarriers.
I2C-compatible interface programs channel and modulation functions.
Video test pattern and 1 kHz audio test signal aid system checks.
Feature Summary
- PAL/NTSC audio/video RF modulator with integrated VCO.
- UHF channel 21-69 operation; VHF output is possible through internal dividers.
- High-speed I2C-compatible control, specified up to 800 kHz.
- Programmable picture-to-sound carrier ratio and test-pattern functions.
- Logic output port at pin 3 and programmable standby mode.
- Transient RF output inhibit during PLL acquisition at power-on.
Package & Footprint
The database lists 16-SOIC (0.154", 3.90mm Width); the package registry normalizes this to 16-SOIC and names /upload/package/16-SOIC.jpg. The original manufacturer family sheet calls the package SO16NB. Compare the complete SO16NB dimensions and pin-1 orientation with the board footprint before substitution.
- Verify body width and lead pitch against SO16NB drawing.
- Place supply decoupling close to the relevant ground pins.
- Locate the RF PLL loop-filter components close to VCCD as directed in the manufacturer application diagram.
The local package JPG is absent and the production image URL returns HTTP 404; this detail must remain unpublished.
Pin Functions
The following assignments are from the original MC44BS374T1/374T1A SO16 pin table.
I2C-compatible clock and data.
Logic output port and crystal connection.
Ground and audio pre-emphasis capacitor.
Audio input and sound-PLL loop filter.
Video input and main analog supply.
Analog ground and RF television output.
Output-stage supply and RF PLL loop filter.
Digital supply and digital ground.
Consult the original pin graphic and electrical tables before wiring.
Key Specifications
| Device family | MC44BS374T1A PLL-tuned audio/video RF modulator |
|---|---|
| Operating supply voltage | 4.5 to 5.5 V; 5.0 V typical |
| Operating ambient temperature | 0 to +70°C |
| Active supply current | 42 to 58 mA; 50 mA typical under stated test conditions |
| Standby supply current | 3 to 7 mA; 5 mA typical under stated test conditions |
| UHF range | Channels 21-69 |
| VHF possibility | 30-450 MHz through internal dividers, subject to configuration |
| Sound subcarrier selections | 4.5, 5.5, 6.0 and 6.5 MHz |
| I2C-compatible bus | Up to 800 kHz; 3.3 V and 5 V interface compatible |
| A-family TV output level | 82 dBµV typical at the manufacturer's stated conditions |
| Video modulation depth | 82% typical |
| Package family | 16-pin SO16NB / database 16-SOIC |
Typical values are not guaranteed limits. The 6 V supply figure in the source is an absolute maximum, not a normal operating setting.
Replacement Considerations
NXP's later MC44CC373/374 document cross-references the MC44BS374T1AEF legacy base code, but its successor devices are not assumed to be pin-compatible. Check the RF output, power rails, I2C register behavior, package drawing and pin mapping before any redesign. No unverified LCDChip substitute link is provided.
Manufacturer Information
The original Motorola/Freescale MC44BS374T1/374T1A advance datasheet (Rev. 1.2, November 2003) describes the family and SO16NB pins. NXP's later MC44CC373/374 datasheet explicitly names legacy MC44BS374T1AEF in its cross-reference. The original family sheet states that R2 is the tape-and-reel suffix, but does not individually list the AEF package code; verify this complete legacy order code against label and traceability records.
Applications
Generate television-channel RF output from composite audio/video.
Provide modulated RF output for compatible television inputs.
Use the built-in video and audio test functions during integration.
Service existing designs built around this modulator family.
Quality & Authenticity
Verify full part marking, AEF base code, R2 reel labeling, SO16NB outline and lot traceability. An unmarked 16-pin modulator should not be treated as interchangeable merely because its footprint fits.
FAQ
What controls the RF channel?
The I2C-compatible interface programs the integrated RF PLL and oscillator.
Does the A variant differ from the base MC44BS374T1?
Yes. The family sheet lists a higher typical TV output level for the A version: 82 rather than 75 dBµV.
Can a later MC44CC part be installed directly?
Do not assume so. Compare the complete pinout, programming and electrical requirements first.
Engineering Notice
Use the original MC44BS374T1/374T1A datasheet for design limits and pins, and the later NXP cross-reference only to identify the AEF legacy base code. Confirm the full AEF/R2 ordering suffix with supplier traceability. The required production 16-SOIC JPG is missing (HTTP 404), so keep this page in review with isRed=0 until the asset and rendered page are verified.
MC44BS374T1AEFR2 Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- NXP USA Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- NTSC/PAL Modulator
- Applications:
- Audio/Video, VCR's, Set-Top Boxes
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Grade:
- -
- Qualification:
- -
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