ST16C450CQ48-F Exar Corporation, ST16C450CQ48-F Datasheet - Page 10

IC UART SINGLE 48TQFP

ST16C450CQ48-F

Manufacturer Part Number
ST16C450CQ48-F
Description
IC UART SINGLE 48TQFP
Manufacturer
Exar Corporation
Type
UARTsr
Datasheet

Specifications of ST16C450CQ48-F

Package / Case
48-TQFP
Features
*
Number Of Channels
1, UART
Fifo's
1 Byte
Voltage - Supply
2.97 V ~ 5.5 V
With False Start Bit Detection
Yes
With Modem Control
Yes
With Cmos
Yes
Mounting Type
Surface Mount
Data Rate
1.5 Mbps
Supply Current
3 mA
Maximum Operating Temperature
0 C
Minimum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Operating Supply Voltage
7 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ST16C450CQ48-F
Manufacturer:
EXAR
Quantity:
1 400
Part Number:
ST16C450CQ48-F
Manufacturer:
Exar Corporation
Quantity:
10 000
ST16C450
Loopback Mode
The internal loop-back capability allows onboard diag-
nostics. In the loop-back mode the normal modem
interface pins are disconnected and reconfigured for
loop-back internally. In this mode MSR bits 4-7 are
also disconnected. However, MCR register bits 0-3
can be used for controlling loop-back diagnostic test-
ing. In the loop-back mode -OP1 and -OP2 in the MCR
register (bits 0-1) control the modem -RI and -CD
inputs respectively. MCR signals -DTR and -RTS (bits
0-1) are used to control the modem -CTS and -DSR
inputs respectively. The transmitter output (TX) and
the receiver input (RX) are disconnected from their
Figure 3, EXTERNAL CRYSTAL OSCILLATOR
Rev. 4.20
CONNECTION
C1
22pF
X1
1.8432 MHz
R2
1M
R1
50-120
C2
33pF
10
associated interface pins, and instead are connected
together internally (See Figure 4). The -CTS, -DSR, -CD,
and -RI are disconnected from their normal modem
control inputs pins, and instead are connected inter-
nally to -DTR, -RTS, -OP1 and -OP2. Loop-back test
data is entered into the transmit holding register via the
user data bus interface, D0-D7. The transmit UART
serializes the data and passes the serial data to the
receive UART via the internal loop-back connection. The
receive UART converts the serial data back into parallel
data that is then made available at the user data
interface, D0-D7. The user optionally compares the
received data to the initial transmitted data for verifying
error free operation of the UART TX/RX circuits.
In this mode , the receiver and transmitter interrupts are
fully operational. The Modem Control Interrupts are also
operational. However, the interrupts can only be read
using lower four bits of the Modem Control Register
(MCR bits 0-3) instead of the four Modem Status
Register bits 4-7. The interrupts are still controlled by
the IER.

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