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SN74GTLPH32912ZKFR Datasheet(PDF) 7 Page - Texas Instruments |
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SN74GTLPH32912ZKFR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 17 page www.ti.com Recommended Operating Conditions (1) (2) (3) (4) SN74GTLPH32912 36-BIT LVTTL-TO-GTLP UNIVERSAL BUS TRANSCEIVER SCES379A – JANUARY 2002 – REVISED MAY 2005 MIN NOM MAX UNIT VCC, Supply voltage 3.15 3.3 3.45 V BIAS VCC GTL 1.14 1.2 1.26 VTT Termination voltage V GTLP 1.35 1.5 1.65 GTL 0.74 0.8 0.87 VREF Reference voltage V GTLP 0.87 1 1.1 B port VTT VI Input voltage V Except B port VCC 5.5 B port VREF + 0.05 VIH High-level input voltage V Except B port 2 B port VREF – 0.05 VIL Low-level input voltage V Except B port 0.8 IIK Input clamp current –18 mA IOH High-level output current A port –24 mA A port 24 IOL Low-level output current mA B port 50 ∆t/∆v Input transition rise or fall rate Outputs enabled 10 ns/V ∆t/∆V CC Power-up ramp rate 20 µs/V TA Operating free-air temperature –40 85 °C (1) All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. (2) Proper connection sequence for use of the B-port I/O precharge feature is GND and BIAS VCC = 3.3 V first, I/O second, and VCC = 3.3 V last, because the BIAS VCC precharge circuitry is disabled when any VCC pin is connected. The control and VREF inputs can be connected anytime, but normally are connected during the I/O stage. If B-port precharge is not required, any connection sequence is acceptable, but generally, GND is connected first. (3) VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded. (4) VREF can be adjusted to optimize noise margins, but normally is two-thirds VTT. TI-OPC circuitry is enabled in the A-to-B direction and is activated when VTT > 0.7 V above VREF. If operated in the A-to-B direction, VREF should be set to within 0.6 V of VTT to minimize current drain. 7 |
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