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E646ATF Datasheet(PDF) 4 Page - Semtech Corporation |
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E646ATF Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 13 page 4 2000 Semtech Corp. www.semtech.com EDGE HIGH-PERFORMANCE PRODUCTS Edge646 output which series terminates the transmission line to the DUT. In this environment, the driver can withstand a short to any legal DUT voltage for an indefinite period. In a low impedance application with no additional output series resistance, care must be exercised and systems should be designed to check for this condition and tristate the driver if a short is detected. The driver does NOT have on-chip short circuit protection or limitation circuitry. VBB VBB is an analog input which establishes the threshold for all single ended digital input signals. If SW0 EN*, SW1 EN*, or SW2 EN* are more positive than VBB, these inputs are a digital “1". Conversely, if they are more negative than VBB, they are a “0". All digital inputs are wide voltage comparator inputs, so they are technology independent. By establishing the appropriate VBB level for the switch control inputs, and the appropriate differential input levels for the driver digital control inputs, the Edge646 may be driven by TTL, ECL, CMOS, or any custom level circuitry. Figure 1. Driver Digital Inputs Figure 2. Driver Differential Digital Inputs Circuit Description Driver Description The Edge646 driver supports three distinct programmable driver levels; high, low, termination, and high impedance. There are no restrictions between any of these three levels in that all three may vary independently over the entire operating voltage range between VCC and VEE. The DVR EN*, DATA, and VTT EN pins are digital inputs that control the driver (see Table 1). With DVR EN* low, DATA determines whether the driver will force VH or VL at DOUT. With DVR EN* high, VTT EN* controls whether the driver goes into high impedance or drives VTT.. Table 1. Driver Truth Table VH, VL, and VTT VH, VL, and VTT define the logical “1”, “0”, and “termination” levels of the driver and can be adjusted anywhere over the range spanned by VCC to VEE. There is no restriction between VH, VL, and VTT, in that they can all vary independently over the entire voltage range determined by the power supply levels. The VH, VL, and VTT inputs are unbuffered in that they also provide the driver output current, so the sources of these voltages must have ample current drive capability. While VTT is referred to as the termination voltage, it may also be used as a very high “programming” level on many memory devices. Driver Output Protection The Edge646 is designed to operate in a functional testing environment where a controlled impedance (typically 50 Ω) is maintained between the pin electronics and the DUT. In general, there will be an external resistor at the driver * N E R V DN E T T VA T A DT U O D 10 X Z i H 11 X T T V 0X0 L V 0X1 H V SW0 EN* SW1 EN* SW2 EN* VBB DATA DATA* DVR EN* DVR EN VTT EN VTT EN* |
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