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E649

Octal Pin Electronics Driver/Receiver

Semtech Corporation 

Edge649

TEST AND MEASUREMENT PRODUCTS

Circuit Description

Driver Description

VHIGH and VLOW

VHIGH

VLOW

DATA IN

DUT

VHIGH and VLOW define the logical “1” and “0” levels of

the DUT driver and can be adjusted anywhere over the

range determined by VCC and VEE. Table 1 documents

the relationship between the analog power to supplies

(VCC and VEE), the driver range (VHIGH and VLOW), and

the comparator threshold range (VTHRESHOLD).

DVR EN*

Figure 1. Driver Diagram

As shown in Figure 1, Edge649 supports programmable

high and low levels and tristate per channel. There are

no shared lines between any drivers. The DVR EN* and

DATA IN signals are TTL compatible inputs that control

the driver (see Figure 2).

The VHIGH and VLOW inputs are unbuffered in that they

also provide the driver output current (see Figure 3), so

the source of VHIGH and VLOW must have ample current

drive capability.

VHIGH

With DVR EN* high, the DUT driver goes into a high

impedance state. With DVR EN* low, DATA IN high forces

DUT

the driver into a high state (DUT = VHIGH), and DATA IN

low forces the driver low (DUT = VLOW).

DVR EN*

DATA IN

DUT

VHIGH

VLOW

Figure 2. Driver Functionality

VLOW

Figure 3.

Simplified Model of the

Unbuffered Output Stage

Drive/Receive

Common Mode Range

0V <= DUT <= +6.5V

Threshold

Range

0.1V <= THRESHOLD <= 3.0V

0V <= DUT <= +8V

0.1V <= THRESHOLD <= 4.5V

0V <= DUT <= +11V

0.1V <= THRESHOLD <= 7.5V

-3V <= DUT <= +8V

-2.9V <= THRESHOLD <= 4.5V

Revision 5 / October 21, 2002

Table 1. Power Supply Requirement

4

Power Supply

Conditions

VCC = +6.5V

VEE = 0V

VCC = +8V

VEE = 0V

VCC + 11V

VEE = 0V

VCC = +8V

VEE = -3V

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