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TB5D2HLDR Datasheet(PDF) 4 Page - Texas Instruments |
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TB5D2HLDR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 21 page www.ti.com SWITCHING CHARACTERISTICS, 5-V NOMINAL SUPPLY TB5D1M, TB5D2H SLLS579C – SEPTEMBER 2003 – REVISED JANUARY 2008 THIRD STATE—A TB5D1M (or TB5D2H) driver produces pseudo-ECL levels, and has a third-state mode, which is different than a conventional TTL device. When a TB5D1M (or TB5D2H) driver is placed in the third state, the base of the output transistors is pulled low, bringing the outputs below the active-low level of standard PECL devices. [For example: The TB5D1M low output level is typically 2.7 V, while the third state output level is less than 0.1 V.] In a bidirectional, multipoint, bus application, the driver of one device, which is in its third state, may be back driven by another driver on the bus whose voltage in the low state is lower than the third-stated device. This could come about due to differences in the driver's independent power supplies. In this case, the device in the third state controls the line, thus clamping the line and reducing the signal swing. If the difference voltage between the independent driver power supplies is small, this consideration can be ignored. Again using the TB5D1M driver as an example, a typical supply voltage difference between separate drivers of > 2 V can exist without significantly affecting the amplitude of the signal. over recommended operating conditions unless otherwise noted parameter test conditions min typ(1) max unit tP1 Propagation delay time, input high to output(2) 1.2 2 CL = 5 pF, See Figure 1 and ns Figure 3 tP2 Propagation delay time, input low to output(2) 1.2 2 ΔtP Capacitive delay 0.01 0.03 ns/pF Propagation delay time, tPHZ 7 12 high-level-to-high-impedance output Propagation delay time, tPLZ 7 12 low-level-to-high-impedance output CL = 5 pF, See Figure 2 and ns Figure 3 Propagation delay time, tPZH 5 12 high-impedance-to-high-level output Propagation delay time, tPZL 4 12 high-impedance-to-low-level output tskew1 Output skew, |tP1 - tP2| 0.15 0.3 tshew2 Output skew, |tPHH - tPHL|, |tPLH - tPLL| 0.15 1.1 CL = 5 pF, See Figure 1 and ns Figure 3 tskew(pp) Part-to-part skew(3) 0.1 1 Δtskew Output skew, difference between drivers(4) 0.3 tTLH Rise time (20% - 80%) 0.7 2 CL = 5 pF, See Figure 1 and ns Figure 3 tTHL Fall time (80% - 20%) 0.7 2 (1) All typical values are at 25C and with a 5-V supply. (2) Parameters tP1 and tP2 are measured from the 1.5 V point of the input to the crossover point of the outputs (see Figure 1). (3) tskew(pp) is the magnitude of the difference in differential propagation delay times, tP1 or tP2, between any specified outputs of two devices when both devices operate with the same supply voltage, at the same temperature, and have identical packages and test circuits. (4) Δtskew is the magnitude of the difference in differential skew tskew1 between any specified outputs of a single device. 4 Submit Documentation Feedback Copyright © 2003–2008, Texas Instruments Incorporated Product Folder Link(s): TB5D1M TB5D2H |
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