EXAR ST16C450CP

Mfr. Part

ST16C450CP

Manufacturer

XR (Exar). Y-IC is a quality distributor for XR products, and we will provide you with the best products and services

Detailed Description

Single-channel asynchronous UART (16C450-class), 5 V supply, PC/AT compatible. Standard 8-bit parallel host bus interface, programmable baud rate generator, modem control lines, and interrupt logic. Package is through-hole PDIP-40. This 16C450 type has a 1-byte transmit/receive buffer (no deep FIFO), making it simple, predictable, and easy to integrate. Suitable for legacy serial COM ports and embedded systems that require a classic 16450/16550-compatible UART behavior

Key Features

100% 16C450 register set and behavior (PC/AT compatible)

8-bit host data bus; address decode for internal registers (A0–A2)

Programmable baud rate generator using a standard crystal or external clock

Typical 1.8432 MHz crystal support; high-speed operation with faster input clocks (up to the vendor’s maximum, commonly supporting high baud rates)

Configurable data word length (5 to 8 bits), parity (even/odd/none), and stop bits (1 or 2)

Modem control and status: RTS, CTS, DTR, DSR, DCD, RI

Programmable interrupts; single interrupt output to host

Loopback test mode

TXD and RXD serial pins; BAUDOUT and RCLK support signals

Compatible with many legacy software drivers and operating systems

Key Advantages

Simple, proven UART core for deterministic serial communication

Drop-in replacement option for many 16450/16C450 DIP-40 sockets

Wide ecosystem, broad software support, and easy bring-up

Ideal for cost-sensitive or legacy systems that do not need deep FIFOs

Through-hole PDIP-40 for easy prototyping, repair, and low-volume production

Packaging

Type: Through-hole PDIP-40 (0.6 inch row spacing)

Material: Molded epoxy plastic body, copper lead frame with tin finish (RoHS status varies by lot; confirm when ordering)

Size (typical PDIP-40): body length ~52.3 mm, body width ~13.0–14.0 mm, body height ~3.5–5.0 mm; lead pitch 2.54 mm; row spacing 15.24 mm

Pin configuration (16450 standard style):

- Data bus: D0–D7

- Address: A0–A2

- Control: CS/Chip Select, RD/Read, WR/Write, MR/RESET

- Serial: TXD, RXD

- Modem control/status: RTS, CTS, DTR, DSR, DCD, RI

- Clock and timing: XIN, XOUT (crystal pins), RCLK (receiver clock), BAUDOUT

- Interrupt: INTRPT/INT

Thermal characteristics (typical for PDIP-40 class): operating ambient 0 to +70°C (commercial C-grade), storage -65 to +150°C; θJA commonly ~60–80°C/W (boardand airflow-dependent)

Electrical properties (typical 5 V TTL/CMOS levels):

- VCC 4.75 V to 5.25 V

- VIH ≥ 2.0 V; VIL ≤ 0.8 V; VOH ≥ 2.4 V; VOL ≤ 0.4 V at standard loads

- Input clock with 1.8432 MHz crystal typical; higher external clocks supported per datasheet (enabling higher baud rates)

- Supply current typically in the single-digit mA range in active mode (exact figures per datasheet)

Lifecycle

Status: Mature legacy product family. Availability may be limited by package and lot. Some distributors list 16C450-class DIP devices as NRND or discontinued. Y-IC can help verify current status for ST16C450CP specifically

Direct or close equivalents (check pinout, voltage, and timing before use):

- TI TL16C450N (PDIP-40, 5 V)

- NXP SC16C450N (PDIP-40, 5 V)

- National/NS PC16450DN (PDIP-40, 5 V; legacy)

- WD16C450 and compatible 16450-family parts (legacy)

Enhanced pin-compatible alternatives with FIFOs (superset functionality; often a practical upgrade):

- XR16C550CP (Exar/XR, PDIP-40, 16-byte FIFO)

- TI TL16C550C (PDIP-40, 16-byte FIFO)

- NXP SC16C550B (various packages; check DIP availability)

If you need exact, current lifecycle confirmation or vetted pin-compatible alternatives, contact Y-IC sales via our website. We will provide detailed cross-reference guidance and availability options

Key Application Areas

Legacy PC COM-port implementations and ISA/embedded designs

Industrial control, SCADA, PLC serial links

POS terminals, ticketing, kiosks

Instrumentation, data loggers, lab equipment

Modems and telecom cards requiring modem control signals

Routers, gateways, and console ports

CNC and factory automation with RS-232/RS-485 transceivers

Datasheet

Y-IC hosts the most authoritative datasheet for ST16C450CP on our product page. We recommend downloading it directly from this page to get exact electrical limits, timing, pinouts, and application notes

Request for Quotation Now

In stock quantity reference: 2615 pieces available now at Y-IC. Act fast. Get a Quote today on our website to lock in pricing and lead time. Limited Time Offer. Need help choosing an alternative or upgrade? Learn More on the product page or chat with our sales team for immediate support