Overview
Information | Quad UART with a Dual Foot Print Interface |
---|---|
Data Bus Interface | Intel, Motorola |
# of Channels | 4 |
Max Data Rate 5V (Mbps) | 1.5 |
Max Data Rate 3.3V (Mbps) | 0.5 |
Max Data Rate 2.5V (Mbps) | na |
Max Data Rate 1.8V (Mbps) | na |
Tx FIFO (Bytes) | 1 |
Rx FIFO (Bytes) | 1 |
Auto Flow Control | |
Auto RS-485 Half-Duplex Control | |
Multidrop (9-bit) Mode | |
Fractional Baud Rate Generator | |
Power Down Mode | |
Supply Voltage Range VCC (V) | 2.97 to 5.5 |
Auto RTS/CTS | |
Package | PLCC-68 |
FIFO Level Counters | |
Selectable/ Programable Trigger Levels | |
IrDA Sup | |
5V Tolerant Inputs | |
Max UART/GPIO Input Voltage (V) | VCC |
Max UART/GPIO Output Voltage (V) | VCC |
Temperature Range (°C) | -40 to 85 |
The ST16C454 is a universal asynchronous receiver and transmitter (UART) with a dual foot print interface. The 454 is an enhanced UART with data rates up to 1.5Mbps and software compatible to ST16C450. Onboard status registers provide the user with error indications and operational status, modem interface control. System interrupts may be tailored to meet user requirements. An internal loop-back capability allows onboard diagnostics.
The ST16C454 offer an additional 68 mode which allows easy integration with Motorola, and other popular microprocessors. The 454 combines the package interface modes of the ST16C454 and ST68C454 series on a single integrated chip.
- Software compatibility with the Industry Standard 16C450
- 1.5 Mbps transmit/receive operation (24MHz)
- Independent transmit and receive control
- Software selectable Baud Rate Generator
- Modem control signals (-CTS, -RTS, -DSR, -DTR, -RI, -CD)
- Programmable character lengths (5, 6, 7, 8)
- Even, odd, or no parity bit generation and detection
- Internal loop-back diagnostics
- TTL compatible inputs, outputs
- Low power
- Pb-Free, RoHS Compliant Versions Offered
- Portable Appliances
- Telecommunication Network Routers
- Ethernet Network Routers
- Cellular Data Devices
- Factory Automation and Process Controls
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | st16454 Datasheet | 3.3.1 | August 2005 | 176.9 KB |
Application Notes | DAN-108, UART Crystal Oscillator Design Guide | 1.0.0 | March 2000 | 218.1 KB |
Application Notes | DAN-107, Interfacing 16Cxxx UARTs to a CPU | 1.0.0 | August 1999 | 32.4 KB |
Application Notes | AN-454, ST16C454 Application Example | 1.0.0 | February 1997 | 77.7 KB |
Application Notes | General UART Application Note | 1.0.0 | December 1996 | 39.8 KB |
User Guides & Manuals | Evaluation Board User's Manual | 2.0.0 | August 2003 | 17.3 KB |
Product Brochures | Interface Brochure | November 2023 | 3.7 MB | |
Schematics & Design Files | ISA Eval Board Schematic | 1.1.0 | September 2007 | 187.4 KB |
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Suggested Replacement | PDN |
---|---|---|---|---|---|---|
ST16C454CJ68-F | PLCC68 | 0 | 70 | OBS | ST16C554DCJ68-F | |
ST16C454CJ68TR-F | PLCC68 | 0 | 70 | OBS | ST16C554DCJ68TR-F | |
ST16C454IJ68-F | PLCC68 | -40 | 85 | OBS | ST16C554DIJ68-F | |
ST16C454IJ68TR-F | PLCC68 | -40 | 85 | OBS | ST16C554DIJ68TR-F |
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Packaging
Notifications
FAQs & Support
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Please check that all the following conditions are satisfied first.
- no interrupts pending (ISR bit-0 = 1)
- modem inputs are not toggling (MSR bits 0-3 = 0)
- RX input pin is idling HIGH • divisor (the value in DLL register) is non-zero
- TX and RX FIFOs are empty
Be sure sleep mode bit has been set to 1. If there are multiple UART channels, the sleep conditions must be true for all channels.
See more on Sleep Mode in AN204 UART Sleep Mode.
Yes. Note: some devices do have powersave mode. If UART goes into powersave mode, then the registers are not accessible.
See more on Sleep Mode in AN204 UART Sleep Mode.
Read LSR register to check whether the UART receives the data or not.
- If LSR value is 0x60, it means that either UART receiver FIFO doesn’t receive the data or the data in receiver FIFO has been read out before the read of LSR.
- If LSR value is 0x00, it means data is still in the THR (clock doesn’t oscillate to transmit data).
- If LSR value is 0xFF, it means either UART is in powersave mode or UART is powered off. For those devices with powersave mode, be sure that UARTS are not in powersave mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
- Check whether the register set can be accessed.
- Check whether the crystal is oscillating fully.
- Check whether the data can be transmitted in internal loopback mode.
See more on Sleep Mode in AN204 UART Sleep Mode.