参数资料
| 型号： | XR16V554IVTR-F |
| 厂商： | Exar Corporation |
| 文件页数： | 5/43页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO 16B QUAD 64LQFP |
| 标准包装： | 1,000 |
| 特点： | * |
| 通道数： | 4，QUART |
| FIFO's： | 16 字节 |
| 规程： | RS232 |
| 电源电压： | 2.25 V ~ 3.6 V |
| 带自动流量控制功能： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页当前第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页
XR16V554/554D
13
REV. 1.0.3
2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
TABLE 5: TXRDY# AND RXRDY# OUTPUTS IN FIFO AND DMA MODE FOR CHANNELS A-D
PINS
FCR BIT-0=0
(FIFO DISABLED)
FCR BIT-0=1 (FIFO ENABLED)
FCR BIT-3 = 0
(DMA MODE DISABLED)
FCR BIT-3 = 1
(DMA MODE ENABLED)
RXRDY#
LOW = 1 byte
HIGH = no data
LOW = at least 1 byte in FIFO
HIGH = FIFO empty
HIGH to LOW transition when FIFO reaches the
trigger level, or timeout occurs
LOW to HIGH transition when FIFO empties
TXRDY#
LOW = THR empty
HIGH = byte in THR
LOW = FIFO empty
HIGH = at least 1 byte in FIFO
LOW = FIFO has at least 1 empty location
HIGH = FIFO is full
2.7
Crystal Oscillator or External Clock Input
The V554 includes an on-chip oscillator (XTAL1 and XTAL2) to produce a clock for both UART sections in the
device. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a
system clock to the Baud Rate Generators (BRG) section found in each of the UART. XTAL1 is the input to the
oscillator or external clock buffer input with XTAL2 pin being the output. Caution: the XTAL1 input is not 5V
tolerant. For programming details, see “Section 2.8, Programmable Baud Rate Generator” on page 13.
FIGURE 5. TYPICAL CRYSTAL CONNECTIONS
C1
22-47pF
C2
22-47pF
14.7456
MHz
XTAL1
XTAL2
R=300K to 400K
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins. Typical oscillator connections are shown
in Figure 5. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate
generator for standard or custom rates. For further reading on oscillator circuit please see application note
DAN108 on EXAR’s web site.
2.8
Programmable Baud Rate Generator
Each UART has its own Baud Rate Generator (BRG) for the transmitter and receiver. The BRG further divides
this clock by a programmable divisor between 1 and (216 - 0.0625) in increments of 0.0625 (1/16) to obtain a
16X sampling rate clock of the serial data rate. The sampling rate clock is used by the transmitter for data bit
shifting and receiver for data sampling. The BRG divisor defaults to the maximum baud rate (DLL = 0x01 and
DLM = 0x00) upon power up and reset. Programming the Baud Rate Generator Registers DLL and DLM
provides the capability for selecting the operating data rate. Table 6 shows the standard data rates available
with a 24MHz crystal or external clock at 16X clock rate. If the pre-scaler is used (MCR bit-7 = 1), the output
data rate will be 4 times less than that shown in Table 6.
相关PDF资料 |
PDF描述 |
|---|---|
| XR16V564IJ-F | IC UART FIFO 32B QUAD 68PLCC |
| XR16V598IQ100-F | IC UART FIFO 16B OCTAL 100QFP |
| XR16V654DIV-F | IC UART FIFO 64B QUAD 64LQFP |
| XR16V698IQ100-F | IC UART FIFO 32B OCTAL 100QFP |
| XR16V794IV-F | IC UART FIFO 64B QUAD 64LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XR16V564 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.25V TO 3.6V QUAD UART WITH 32-BYTE FIFO |
| XR16V564_07 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.25V TO 3.6V QUAD UART WITH 32-BYTE FIFO |
| XR16V564D | 制造商:EXAR 制造商全称:EXAR 功能描述:2.25V TO 3.6V QUAD UART WITH 32-BYTE FIFO |
| XR16V564DIV | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| XR16V564DIV-0A-EB | 功能描述:UART 接口集成电路 Supports V564 64 ld LQFP, ISA Interface RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。