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ST16C2550CQ48 Datasheet

  • ST16C2550CQ48

  • DUAL UART WITH 16-BYTE TRANSMIT AND RECEIVE FIFO’S

  • 34頁

  • EXAR   EXAR

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DUAL UART WITH 16-BYTE TRANSMIT
AND RECEIVE FIFO聮S
ST16C2550
DESCRIPTION
The ST16C2550 (2550) is a dual universal asynchronous receiver and transmitter (UART). The ST16C2550 is
an improved version of the NS16C550 UART with higher operating speed and lower access time. The 2550
provides enhanced UART functions with 16 byte FIFO聮s, a modem control interface, and data rates up to 1.5Mbps.
Onboard status registers provide the user with error indications and operational status. System interrupts and
modem control features may be tailored by external software to meet specific user requirements. An internal loop-
back capability allows onboard diagnostics. Independent programmable baud rate generators are provided to
select transmit and receive clock rates from 50 Bps to 1.5 Mbps. The Baud rate generator can be configured for
either crystal or external clock input. The 2550 is available in a 40-pin plastic-DIP, 44-pin PLCC, and 48-pin TQFP
packages. The 40 pin package does not offer TXRDY and RXRDY pins (DMA Signal monitoring). Otherwise the
three package versions are the same. The 2550 is functionally compatible with the 16C2450. The 2550 is
fabricated in an advanced CMOS process to achieve low drain power and high speed requirements.
FEATURES
鈥?/div>
Pin and functionally compatible to ST16C2450/
Software compatible with INS8250, NS16C550
鈥?/div>
1.5Mbps transmit/receive operation (24MHz
Max.)
鈥?/div>
16 byte transmit FIFO to reduce the bandwidth
requirement of the external CPU.
鈥?/div>
16 byte receive FIFO with error flags to reduce the
bandwidth requirement of the external CPU.
鈥?/div>
Independent transmit and receive UART control
鈥?/div>
Four selectable Receive FIFO interrupt trigger
levels
鈥?/div>
Modem control signals (-CTS, -RTS, -DSR, -DTR,
-RI, -CD, and Software controllable line break)
鈥?/div>
Programmable character lengths (5, 6, 7, 8) with
Even, odd, or no parity
鈥?/div>
Status report register
鈥?/div>
Crystal or external clock input
鈥?/div>
460.8 Kbps transmit/receive operation with 7.3728
MHz crystal or external clock source
鈥?/div>
TTL compatible inputs, outputs
PLCC Package
-TXRDYA
-DSRA
41
44
43
42
D5
D6
D7
RXB
RXA
-TXRDYB
TXA
TXB
-OPB
-CSA
-CSB
7
8
9
10
11
12
13
14
15
16
17
XTAL1 18
XTAL2 19
-IOW 20
-CDB 21
GND 22
-RXRDYB 23
-IOR 24
-DSRB 25
-RIB 26
-RTSB 27
-CTSB 28
40
6
5
4
3
2
1
-CTSA
-CDA
VCC
-RIA
D4
D3
D2
D1
D0
39
38
37
36
35
RESET
-DTRB
-DTRA
-RTSA
-OPA
-RXRDYA
INTA
INTB
A0
A1
A2
ST16C2550CJ44
34
33
32
31
30
29
ORDERING INFORMATION
Part number
ST16C2550CP40 40
ST16C2550CJ44 44
ST16C2550CQ48 48
Pins Package
PDIP
PLCC
TQFP
Operating temperature
0擄 C to + 70擄 C
0擄 C to + 70擄 C
0擄 C to + 70擄 C
Part number
ST16C2550IP40
ST16C2550IJ44
ST16C2550IQ48
40
44
48
Pins Package
PDIP
PLCC
TQFP
Operating temperature
-40擄 C to + 85擄 C
-40擄 C to + 85擄 C
-40擄 C to + 85擄 C
Rev. 3.20
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017

ST16C2550CQ48相關(guān)型號(hào)PDF文件下載

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