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CDCE421 数据表(PDF) 11 Page - Texas Instruments |
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CDCE421 数据表(HTML) 11 Page - Texas Instruments |
11 / 24 page PACKAGE (QFN24) NC VCC 15 14 13 RGEPACKAGE (TOP VIEW) CDCE421 NC 1 2 3 SDATA 4 NC 5 NC 18 NC 17 VCC 16 NC NC CE NC P0024-05 6 PIN DESCRIPTIONS CDCE421 www.ti.com..................................................................................................................................................... SCAS842B – APRIL 2007 – REVISED JANUARY 2009 The CDCE421 is available in a QFN 24-pin package. The QFN package footprint is illustrated in Figure 5, as well as the pad locations and numbers. Figure 5. Pinout of the CDCE421 QFN-24 Package Table 2 shows the pin descriptions for the CDCE421 QFN-24 package. Table 2. CDCE421 Pin Descriptions TERMINAL TERMINAL ESD TYPE DESCRIPTION NAME NO. PROTECTION Chip enable CE = 1: enable the device and the outputs. CE 1 I Y CE = 0: disable all current sources; in LVDS mode, LVDSP = LVDSN = Hi-Z; in LVPECL mode, LVPECLP = LVPECLN = Hi-Z. GND 8, 9 GND Y Ground 2, 4–6, No connect 11–15, Do not connect these pins. Leave them floating. 18–20, 23,24 High-speed negative differential LVPECL or LVDS outputs. (Outputs are OUTN 7 O Y enabled by CE and selected by the EEPROM configuration registers.) High-speed positive differential LVPECL or LVDS outputs. (Outputs are OUTP 10 O Y enabled by CE and selected by the EEPROM configuration registers.) SDATA 3 I Y Programming pin using TI proprietary interface protocol VCC 16, 17 Power Y 3.3-V power supply In crystal input mode, connect XIN1 to one end of the crystal and XIN2 to the XIN 1 21 I Y other end of the crystal. In LVCMOS input single-ended driven mode, XIN1 XIN 2 22 GND/NC N (pin 21) acts as an input reference, and XIN2 should connect to GND or it can be left unconnected. Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): CDCE421 |
类似零件编号 - CDCE421_15 |
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类似说明 - CDCE421_15 |
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