ST16C450CQ48-F Exar Corporation, ST16C450CQ48-F Datasheet
ST16C450CQ48-F
Specifications of ST16C450CQ48-F
Available stocks
Related parts for ST16C450CQ48-F
ST16C450CQ48-F Summary of contents
Page 1
... CS0 CS1 15 -CS2 16 17 -BAUDOUT Operating temperature Device Status 0° 70° C Active. See the ST16C450CQ48 for new designs. 0° 70° C Active 0° 70° C Active -40° 85° C Active. See the ST16C450IQ48 for new designs. -40° 85° C Active -40° 85° C Active ST16C450 ...
Page 2
... ST16C450 Figure 1, PACKAGE DESCRIPTION, ST16C450 48 Pin TQFP Package N. RCLK 5 N.C. 6 ST16C450CQ48 CS0 CS1 10 11 -CS2 12 -BAUDOUT Rev. 4.20 40 Pin DIP Package N. RESET -OP1 D5 6 -DTR -RTS -OP2 31 RCLK 9 INT 30 N. CS0 CS1 13 25 N.C. 14 -CS2 -BAUDOUT 15 XTAL1 16 XTAL2 17 -IOW 18 IOW 19 GND ...
Page 3
D0-D7 -IOR,IOR -IOW,IOW RESET A0-A2 -AS CS0,CS1 -CS2 -DDIS CSOUT INT Rev. 4.20 Figure 2, BLOCK DIAGRAM Transmit Clock & Baud Rate Generator 3 ST16C450 Shift TX Register Receive Shift RX Register -DTR,-RTS -OP1,-OP2 Modem -CTS Control -RI Logic -CD ...
Page 4
ST16C450 SYMBOL DESCRIPTION Symbol Pin IOR 22 25 CS0 12 14 CS1 13 15 -CS2 14 16 IOW D0-D7 1-8 2-9 GND 20 22 ...
Page 5
SYMBOL DESCRIPTION Symbol Pin 40 44 -IOR 21 24 -IOW 18 20 INT 30 33 CSOUT 24 27 -BAUDOUT 15 17 -DDIS 23 26 -OP1 34 38 RESET 35 39 RCLK 9 10 Rev. 4.20 Signal Pin Description 48 type ...
Page 6
ST16C450 SYMBOL DESCRIPTION Symbol Pin 40 44 -OP2 31 35 VCC 40 44 XTAL1 16 18 XTAL2 -CTS 36 40 -DSR 37 41 -DTR 33 37 Rev. 4.20 Signal Pin Description 48 type 31 O ...
Page 7
SYMBOL DESCRIPTION Symbol Pin -RTS GENERAL DESCRIPTION The ST16C450 provides serial asynchronous receive data synchronization, parallel-to-serial and serial-to- parallel data conversions for both the transmitter and receiver ...
Page 8
ST16C450 FUNCTIONAL DESCRIPTIONS Internal Registers The ST16C450 provides 11 internal registers for monitoring and control. These registers are shown in Table 2 below. These registers function as data holding registers (THR/RHR), interrupt status and control registers (IER/ISR), line status and ...
Page 9
Programmable Baud Rate Generator The ST16C450 supports high speed modem tech- nologies that have increased input data rates by employing data compression schemes. For example a 33.6Kbps modem that employs data compression may require a 115.2Kbps input data rate. A ...
Page 10
ST16C450 Figure 3, EXTERNAL CRYSTAL OSCILLATOR CONNECTION R1 50-120 1.8432 MHz C1 C2 22pF 33pF Loopback Mode The internal loop-back capability allows onboard diag- nostics. In the loop-back mode the normal modem interface pins are disconnected and ...
Page 11
Figure 4, INTERNAL LOOPBACK MODE DIAGRAM D0-D7 -IOR,IOR -IOW,IOW RESET A0-A2 -AS CS0,CS1 -CS2 -DDIS CSOUT INT Rev. 4.20 ST16C450 Transmit Transmit Holding Shift Registers Register Receive Receive Holding Shift Registers Register Clock & Baud Rate Generator ...
Page 12
ST16C450 REGISTER FUNCTIONAL DESCRIPTIONS The following table delineates the assigned bit functions for the twelve ST16C450 internal registers. The as- signed bit functions are more fully defined in the following paragraphs. Table 4, ST16C450 INTERNAL REGISTERS Register ...
Page 13
Transmit and Receive Holding Register The serial transmitter section consists of an 8-bit Transmit Hold Register (THR) and Transmit Shift Register (TSR). The status of the THR is provided in the Line Status Register (LSR). Writing to the THR transfers ...
Page 14
ST16C450 Table 5, INTERRUPT SOURCE TABLE Priority [ISR] Level Bit-3 Bit-2Bit-1 Bit ISR BIT-0: Logic interrupt is pending and the ISR ...
Page 15
LCR BIT-5 = logic 0, parity is not forced (normal default condition) LCR BIT-5 = logic 1 and LCR BIT-4 = logic 0, parity bit is forced to a logical 1 for the transmit and receive data. LCR BIT-5 = ...
Page 16
ST16C450 LSR BIT-3: Logic framing error (normal default condition). Logic 1 = Framing error. The receive character did not have a valid stop bit(s). LSR BIT-4: Logic break condition (normal default condi- tion) Logic ...
Page 17
Scratchpad Register (SPR) The ST16C450 provides a temporary data register to store 8 bits of user information. ST16C450 EXTERNAL RESET CONDITIONS REGISTERS RESET STATE IER IER BITS 0-7 = logic 0 ISR ISR BIT-0=1, ISR BITS 1-7 = logic 0 ...
Page 18
ST16C450 AC ELECTRICAL CHARACTERISTICS T =0° - 70°C (-40° - +85°C for Industrial grade packages), Vcc=3.3 - 5.0 V ± 10% unless otherwise specified. A Symbol Parameter T ,T Clock pulse duration Oscillator/Clock frequency 3w T Address ...
Page 19
ABSOLUTE MAXIMUM RATINGS Supply range Voltage at any pin Operating temperature Storage temperature Package dissipation DC ELECTRICAL CHARACTERISTICS T =0° - 70°C (-40° - +85°C for Industrial grade packages), Vcc=3.3 - 5.0 V ± 10% unless otherwise specified. A Symbol ...
Page 20
ST16C450 T2w EXTERNAL CLOCK -BAUDOUT 1/2 -BAUDOUT 1/3 -BAUDOUT 1/3> -BAUDOUT Rev. 4.20 T1w T3w Clock timing 20 X450-CK-1 ...
Page 21
T4w -AS T5s A0-A2 Address T6s -CS2 CS1-CS0 T7d T8d -IOR IOR T10d CSOUT T11d -DDIS T12d D0-D7 Rev. 4.20 T5h Valid T6h Valid T7h T7w T9d Active T10d Active T11d Active T12h Data General read timing 21 ST16C450 X450-RD-1 ...
Page 22
ST16C450 T4w -AS T5s A0-A2 Address T6s -CS2 CS1-CS0 T13d T14d -IOW IOW D0-D7 Rev. 4.20 T5h Valid T6h Valid T13h T13w T15d Active T16s T16h Data General write timing 22 X550-WD-1 ...
Page 23
Active IOW -RTS Change of state -DTR -CD -CTS -DSR INT -IOR IOR -RI Rev. 4.20 T17d Change of state Change of state T18d Active T19d Active Modem input/output timing 23 ST16C450 Change of state T18d Active Active Active ...
Page 24
ST16C450 START BIT RX INT -IOR IOR Rev. 4.20 DATA BITS (5- DATA BITS 6 DATA BITS 7 DATA BITS 16 BAUD RATE CLOCK Receive timing 24 STOP BIT D6 D7 PARITY NEXT ...
Page 25
START BIT TX INT -IOW Active IOW Rev. 4.20 DATA BITS (5- DATA BITS 6 DATA BITS 7 DATA BITS T23d 16 BAUD RATE CLOCK Transmit timing 25 ST16C450 STOP BIT D6 D7 ...
Page 26
ST16C450 PACKAGE OUTLINE DRAWING Note: The control dimension is the inch column SYMBOL ...
Page 27
PACKAGE OUTLINE DRAWING Seating Plane Rev. 4.20 48 LEAD THIN QUAD FLAT PACK (TQFP Note: The control dimension is the millimeter column INCHES SYMBOL MIN MAX ...
Page 28
... While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ...