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NXP USA Inc. MC44BS374T1EFR2
- Part No.:
- MC44BS374T1EFR2
- 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
MC44BS374T1EFR2 - PLL-Tuned Audio/Video RF Modulator
The MC44BS374T1 family integrates a programmable RF oscillator, PLL, sound subcarrier and audio/video modulation for legacy television-output equipment. This customer record identifies the EF 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 | MC44BS374T1 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 |
| Base-family TV output level | 75 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 MC44BS374T1EF 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 MC44BS374T1EF in its cross-reference. The original family sheet states that R2 is the tape-and-reel suffix, but does not individually list the EF 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, EF 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 base variant differ from MC44BS374T1A?
Yes. The family sheet lists 75 dBµV typical for the base version and 82 dBµV typical for the A version.
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 EF legacy base code. Confirm the full EF/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.
MC44BS374T1EFR2 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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