參數(shù)資料
型號： TL16C554I
廠商： Texas Instruments, Inc.
英文描述： ASYNCHRONOUS COMMUNICATIONS ELEMENT
中文描述： 異步通信元
文件頁數(shù)： 5/33頁
文件大?。?/td> 478K
代理商： TL16C554I
TL16C554, TL16C554I
ASYNCHRONOUS COMMUNICATIONS ELEMENT
SLLS165D – JANUARY 1994 – REVISED JULY 1998
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
NAME
FN
NO.
PN
NO.
I/O
DESCRIPTION
INTA, INTB,
INTC, INTD
15, 21,
49, 55
27, 34,
67, 74
O
External interrupt output. The INTx outputs go high (when enabled by the interrupt register) and
inform the CPU that the ACE has an interrupt to be serviced. Four conditions that cause an interrupt
to be issued are: a receiver error, receiver data available or timeout (FIFO mode only), transmitter
holding register empty, and an enabled modem status interrupt. The interrupt is disabled when it is
serviced or as the result of a master reset.
IOR
52
70
I
Read strobe. A low level on IOR transfers the contents of the TL16C554 data bus to the external CPU
bus.
IOW
18
31
I
Write strobe. IOW allows the CPU to write into the selected address by the address register.
RESET
37
53
I
Master reset. When active, RESET clears most ACE registers and sets the state of various signals.
The transmitter output and the receiver input is disabled during reset time.
RIA, RIB,
RIC, RID
8, 28,
42, 62
18, 43,
58, 3
I
Ring detect indicator. A low on RIx indicates the modem has received a ring signal from the telephone
line. The condition of this signal can be checked by reading bit 6 of the modem status register.
RTSA, RTSB,
RTSC, RTSD
14, 22,
48, 56
26, 35,
66, 75
O
Request to send. When active, RTSx informs the modem or data set that the ACE is ready to receive
data. Writing a 1 in the modem control register sets this bit to a low state. After reset, this terminal
is set high. These terminals have no affect on the transmit or receive operation.
RXA, RXB
RXC, RXD
7, 29,
41, 63
17, 44,
57, 4
I
Serial input. RXx is a serial data input from a connected communications device. During loopback
mode, the RXx input is disabled from external connection and connected to the TXx output internally.
RXRDY
38
54
O
Receive ready. RXRDY goes low when the receive FIFO is full. It can be used as a single transfer
or multitransfer.
TXA, TXB
TXC, TXD
17, 19,
51, 53
29, 32,
69, 72
O
Transmit outputs. TXx is a composite serial data output that is connected to a communications
device. TXA, TXB, TXC, and TXD are set to the marking (high) state as a result of reset.
TXRDY
39
55
O
Transmit ready. TXRDY goes low when the transmit FIFO is full. It can be used as a single transfer
or multitransfer function.
VCC
13, 30,
47, 64
5, 25,
45, 65
Power supply
XTAL1
35
50
I
Crystal input 1 or external clock input. A crystal can be connected to XTAL1 and XTAL2 to utilize the
internal oscillator circuit. An external clock can be connected to drive the internal clock circuits.
XTAL2
36
51
O
Crystal output 2 or buffered clock output (see XTAL1).
absolute maximum ratings over free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
Input voltage range at any input, V
I
Output voltage range, V
O
Continuous total power dissipation at (or below) 70
°
C
Operating free-air temperature range, T
A
: TL16C554
–0.5 V to 7 V
–0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TL16C554I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage levels are with respect to GND.
–0.5 V to V
CC
+ 3 V
500 mW
–0
°
C to 70
°
C
–40
°
C to 85
°
C
–65
°
C to 150
°
C
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TL16C554IFN 功能描述:UART 接口集成電路 Quad UART with 16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C554IFNG4 功能描述:UART 接口集成電路 Quad UART w/16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C554IFNR 功能描述:UART 接口集成電路 Quad UART with 16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C554IFNRG4 功能描述:UART 接口集成電路 Quad UART w/16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C554IPN 功能描述:UART 接口集成電路 Qd UART w/16b FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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