���������������������������������������������������������������� Maxim Integrated Products 21

MAX19005

Quad, Ultra-Low-Power,

200Mbps ATE Drivers/Comparators

Passive Load

The IC channels each feature a passive load consisting

of a buffered input voltage (LDV_) connected to DUT_

through two resistive paths (Figure 2). Each path con-

nects to DUT_ individually by a switch controlled through

the serial interface. Programming options include none

(load disconnected), either, or both paths connected.

The loads facilitate fast open/short testing in conjunction

with the comparator, and pullup of open-drain DUT_ out-

puts. See Table 3.

Parametric Switches

Each of the four IC channels provide force-and-sense

paths for connection of a PMU or other DC resource to

the device-under-test (Figure 2). Both force and sense

switches are simultaneously controlled through the serial

interface providing maximum application flexibility. PMU_

and DUT_ are provided on separate pins, allowing

designs that do not require the parametric switch feature

to avoid the added capacitance of PMU_. It also allows

PMU_ to connect to DUT_, either directly or with an

impedance-matching network. See Table 4.

Low-Leakage Mode (LLEAK_)

Asserting LLEAK_ through the serial port places the

IC into a very-low-leakage state. See the Electrical

Characteristics section. This mode is convenient for mak-

ing IDDQ and PMU measurements without the need for

an output disconnect relay. LLEAK_ control is indepen-

dent for each channel.

When DUT_ is driven with a high-speed signal while

LLEAK_ is asserted, the leakage current momentari-

ly increases beyond the limits specified for normal

operation. The low-leakage recovery specification in

the Electrical Characteristics section indicates device

behavior under this condition.

X = Don’t care.

Table 4. PMU Switch Logic

Table 3. Passive Load Logic

Figure 4. Complementary 50I Comparator Outputs

Table 2. Comparator Logic

INTERNAL CONTROL BITS

PASSIVE LOAD

STATUS

LOAD EN

HIGH�

LOAD EN

LOW�

0

0

Disconnect

0

1

375I load connect

1

0

750I load connect

1

1

750I || 375I

load connect

EXTERNAL

CONNECTION

INTERNAL

CONTROL BIT

PMU SWITCH

STATUS

SWEN

PMU EN�

0

X

Open

1

0

Open

1

1

Short

CONDITION

CMPH�

CMPL�

DUT_ < CHV_

DUT_ < CLV_

0

0

DUT_ < CHV_

DUT_ > CLV_

0

1

DUT_ > CHV_

DUT_ < CLV_

1

0

DUT_ > CHV_

DUT_ > CLV_

1

1

COMPHI

CHV_

DUT_

CLV_

COMPLO

50I

CMPH_

50I

CMPL_

MAX19005