E649APJ datasheet(4/16 Pages) SEMTECH

Part #	E649APJ

Description	Octal Pin Electronics Driver/Receiver

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Manufacturer	SEMTECH [Semtech Corporation]

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Revision 5 / October 21, 2002

www .semtech.com

TEST AND MEASUREMENT PRODUCTS

Edge649

Circuit Description

Driver Description

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).

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

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

the driver into a high state (DUT = V

HIGH), and DATA IN

low forces the driver low (DUT = V

LOW).

Figure 2. Driver Functionality

VHIGH and VLOW

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).

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.

Figure 3.

Simplified Model of the

Unbuffered Output Stage

Table 1. Power Supply Requirement

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R

e

d

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C

d

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s

e

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T

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n

a

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p

u

S

r

e

w

o

P

s

n

o

i

t

i

d

n

o

C

V

5

.

6

+

=

<

T

U

D

=

<

V

0V

0

.

3

=

<

D

L

O

H

S

E

R

H

T

=

<

V

1

.

0V

5

.

6

+

=

C

V

0

=

E

V

8

+

=

<

T

U

D

=

<

V

0V

5

.

4

=

<

D

L

O

H

S

E

R

H

T

=

<

V

1

.

0V

8

+

=

C

V

0

=

E

V

1

+

=

<

T

U

D

=

<

V

0V

5

.

7

=

<

D

L

O

H

S

E

R

H

T

=

<

V

1

.

0V

1

+

C

V

0

=

E

V

8

+

=

<

T

U

D

=

<

V

3

-V

5

.

4

=

<

D

L

O

H

S

E

R

H

T

=

<

V

9

.

2

-V

8

+

=

C

V

3

-

=

E

V

VHIGH

VLOW

DUT

DATA IN

DVR EN*

VHIGH

VLOW

DUT

DATA IN

DVR EN*

VHIGH

VLOW

DUT

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