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TL16C552FNG4 データシート(PDF) 5 Page - Texas Instruments |
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TL16C552FNG4 データシート(HTML) 5 Page - Texas Instruments |
5 / 33 page TL16C552 DUAL ASYCHRONOUS COMMUNICATIONS ELEMENT WITH FIFO SLLS102B − DECEMBER 1990 − REVISED MARCH 1996 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 Terminal Functions (continued) TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION STB 55 I/O Printer strobe. STB is an open-drain line that provides communication between the TL16C552 and the printer. When it is active (low), it provides the printer with a signal to latch the data currently on the parallel port. This terminal has an internal pullup resistor to VDD of approximately 10 kΩ. TRI 2 I 3-state control. TRI controls the 3-state control of all I/O and output terminals. When TRI is asserted, all I/O and outputs become high impedance, allowing board level testers to drive the outputs without overdriving the internal buffers. This terminal is level sensitive, is a CMOS input, and is pulled down with an internal resistor that is approximately 5 k Ω. TXRDY0, TXRDY1 22, 42 O Transmitter ready. TXRDY0 and TXRDY1 are transmitter ready signals. Two types of DMA signaling are available. Either can be selected using FCR3 when operating in the FIFO mode. Only DMA mode 0 is allowed when operating in the TL16C450 mode. Single-transfer DMA (a transfer is made between CPU bus cycles) is supported by mode 0. Multiple transfers that are made continuously until the transmitter FIFO has been filled are supported by mode 1. Mode 0. When in the FIFO mode (FCR0=1, FCR3=0) or in the TL16C450 mode (FCR0=0) and there are no characters in the transmitter holding register or transmitter FIFO, TXRDY are active (low). Once TXRDY is activated (low), it goes inactive after the first character is loaded into the holding register of transmitter FIFO. Mode 1. TXRDYx goes active (low) if in the FIFO mode (FCR0=1) when FCR3=1 and there are no characters in the transmitter FIFO. When the transmitter FIFO is completely full, TXRDYx goes inactive (high). VDD 23, 40, 64 Power supply. VDD is the power supply requirement is 5 V ± 5%. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VDD (see Note 1) −0.5 V to VDD + 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range, VI −0.5 V to 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output voltage range, VO −0.5 V to VDD + 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous total power dissipation 500 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA −10 °C to 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg −65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † 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 ground (VSS). recommended operating conditions MIN NOM MAX UNIT Supply voltage, VDD 4.75 5 5.25 V Clock high-level input voltage, VIH(CLK) 2 VDD V Clock low-level input voltage, VIL(CLK) − 0.5 0.8 V High-level input voltage, VIH 2 VDD V Low-level input voltage, VIL − 0.5 0.8 V Clock frequency, fclock 8 MHz Operating free-air temperature range, TA 0 70 °C |
同様の部品番号 - TL16C552FNG4 |
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同様の説明 - TL16C552FNG4 |
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