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74LVXC3245QSC Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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74LVXC3245QSC Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 9 page www.fairchildsemi.com 6 Power Up Considerations To insure the system does not experience unnecessary ICC current draw, bus contention, or oscillations during power up, the following guidelines should be adhered to (refer to Table 1): • Power up the control side of the device first. This is the VCCA side. • OE should ramp with or ahead of VCCA. This will help guard against bus contention. • The Transmit/Receive control pin (T/R) should ramp with VCCA, this will ensure that the A Port data pins are con- figured as inputs. With VCCA receiving power first, the A I/O Port should be configured as inputs to help guard against bus contention and oscillations. • A side data inputs should be driven to a valid logic level. This will prevent excessive current draw. The above steps will ensure that no bus contention or oscil- lations, and therefore no excessive current draw occurs during the power up cycling of these devices. These steps will help prevent possible damage to the translator devices and potential damage to other system components. TABLE 1. Low Voltage Translator Power Up Sequencing Table Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual Supply CMOS Translating Transceivers. Configurable I/O Application for PCMCIA Cards Block Diagram The LVXC3245 is a 24-pin dual supply device well suited for PCMCIA configurable I/O applications. Ideal for low power notebook designs, the LVXC3245 consumes less than 1 mW of quiescent power in all modes of operation. The LVXC3245 meets all PCMCIA I/O voltage require- ments at 5V and 3.3V operation. By tying VCCB of the LVXC3245 to the card voltage supply, the PCMCIA card will always experience rail to rail output swings, maximizing the reliability of the interface. The VCCA pin on the LVXC3245 must always be tied to a 3V power supply. This voltage connection provides internal references needed to account for variations in VCCB. When connected as in the figure above, the LVXC3245 meets all the voltage and current requirements of the ISA bus stan- dard (IEEE P996). Device Type VCCA VCCB T/R OE A Side I/O B Side I/O Floatable Pin Allowed 74LVXC3245 3V 3V to 5.5V ramp ramp logic outputs yes, VCCB and B (power up 1st) configurable with VCCA with VCCA 0V or VCCA I/O’s w/ OE HIGH |
Similar Part No. - 74LVXC3245QSC_09 |
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Similar Description - 74LVXC3245QSC_09 |
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