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74LVXC4245MTC Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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74LVXC4245MTC Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 8 page 5 www.fairchildsemi.com AC Electrical Characteristics Note 6: Typical values at VCCA = 5V, VCCB = 5V @25°C. Note 7: Typical values at VCCA = 5V, VCCB = 3.3V @25°C. Note 8: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Parameter guaranteed by design. Capacitance Note 9: CPD is measured at 10 MHz. 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. • 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. Symbol Parameter CL = 50 pF CL = 50 pF Units VCCA = 4.5V to 5.5V VCCA = 4.5V to 5.5V VCCB = 4.5V to 5.5V VCCB = 2.7V to 3.6V TA = +25°CTA = −40°C to +85°CTA = +25°CTA = −40°C to +85°C Min Typ Max Min Max Min Typ Max Min Max (Note 6) (Note 7) tPHL Propagation 1.0 4.9 6.5 1.0 7.0 1.0 5.5 7.5 1.0 8.0 ns tPLH Delay A to B 1.0 4.0 5.5 1.0 6.0 1.0 5.0 7.0 1.0 7.5 tPHL Propagation 1.0 4.7 6.5 1.0 7.0 1.0 5.6 7.5 1.0 8.0 ns tPLH Delay B to A 1.0 3.9 5.0 1.0 5.5 1.0 4.3 6.0 1.0 6.5 tPZL Output Enable 1.0 5.6 7.5 1.0 8.0 1.0 6.7 9.0 1.0 10.0 ns tPZH Time OE to B 1.0 5.7 7.5 1.0 8.0 1.0 6.9 9.5 1.0 10.0 tPZL Output Enable 1.0 7.4 9.0 1.0 10.0 1.0 8.0 10.0 1.0 11.0 ns tPZH Time OE to A 1.0 6.1 7.5 1.0 8.5 1.0 6.3 8.0 1.0 8.5 tPHZ Output Disable 1.0 4.8 7.0 1.0 7.5 1.0 6.0 9.0 1.0 9.5 ns tPLZ Time OE to B 1.0 3.8 5.5 1.0 6.0 1.0 4.2 6.5 1.0 7.0 tPHZ Output Disable 1.0 3.4 5.5 1.0 6.0 1.0 3.4 5.5 1.0 6.0 ns tPLZ Time OE to A 1.0 2.9 4.5 1.0 5.0 1.0 2.9 5.0 1.0 5.5 tOSHL Output to Output tOSLH Skew (Note 8) 1.0 1.5 1.5 1.0 1.5 1.5 ns Data to Output Symbol Parameter Typ Units Conditions CIN Input Capacitance 4.5 pF VCC = Open CI/O Input/Output Capacitance 10 pF VCCA = 5V, VCCB = 3.3V CPD Power Dissipation Capacitance A →B45 pF VCCA = 5V (Note 9) B →A50 pF VCCB = 3.3V Device Type VCCA VCCB T/R OE A Side I/O B Side I/O Floatable Pin Allowed 74LVXC4245 5V 2.7V 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 |
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