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74LVX3245WM 데이터시트(PDF) 5 Page - Fairchild Semiconductor |
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74LVX3245WM 데이터시트(HTML) 5 Page - Fairchild Semiconductor |
5 / 9 page 5 www.fairchildsemi.com Capacitance Symbol Parameter Typ Units Conditions CIN Input Capacitance 4.5 pF VCC = Open CI/O Input/Output 15 pF VCCA = 3.3V Capacitance VCCB = 5.0V CPD Power Dissipation A → B 55 pF VCCB = 5.0V Capacitance (Note 9) B → A 40 VCCA = 3.3V Note 9: CPD is measured at 10 MHz 8-Bit Dual Supply Translating Transceiver The LVX3245 is a dual supply device capable of bidirec- tional signal translation. This level shifting ability provides an efficient interface between low voltage CPU local bus with memory and a standard bus defined by 5V I/O levels. The device control inputs can be controlled by either the low voltage CPU and core logic or a bus arbitrator with 5V I/O levels. Manufactured on a sub-micron CMOS process, the LVX3245 is ideal for mixed voltage applications such as notebook computers using 3.3V CPU's and 5V peripheral devices. Power Up Considerations To insure that the system does not experience unneces- sary 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. • 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 Device Type VCCA VCCB T/R OE A Side I/O B Side I/O Floatable Pin Allowed 74LVX3245 3V 5V ramp ramp logic outputs No (power up 1st) configurable with VCCA with VCCA 0V or VCCA Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual Supply CMOS Translating Transceivers. |
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