US431L/431AL

2-2

Rev. 1.2

5/11/98

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

Reference Voltage

Vref

°C

1.228

1.240

1.252

V

US431L

1.221

1.240

1.259

Reference Voltage

Vref

°C

1.234

1.240

1.246

V

US431AL

1.228

1.240

1.252

Vref deviation over full

Vref(dev)

4

12

mV

temperature range

Note 1

Ratio of Vref change to

-1.5

-2.7

mV/V

Cathode voltage change

Reference pin current

Ω , R2=open

0.15

0.5

uA

Iref deviation over full

Iref(dev)

Ω , R2=open

0.05

0.3

uA

temperature range

Note 1

Minimum cathode current

55

80

uA

Off state cathode current

Ioff

0.001

0.1

uA

Dynamic impedance

0.25

0.4

Ω

Unless otherwise specified ,these specifications apply over Ta=0 to 70

Ta=25

°C.Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the

ambient temperature.

Note 2 :

Note 1 : The deviation parameters, Vref(dev) and Iref(dev) are

defined as the differences between the maximum and the minimum

values obtained over the rated temperature range. The average full

range temperature coeficient of the reference input voltage is de-

fined as :

ABSOLUTE MAXIMUM RATINGS

ABSOLUTE MAXIMUM RATINGS

Input Voltage (Vin)

.............................................................

7V

Continuous Cathode Current Range ......................................... -20 mA to +20 mA

Reference Current Range ...................................................... -0.05 mA to 3 mA

Storage Temperature Range ................................

-65

°C TO 150°C

Operating Junction Temperature Range ...................... 0

°C TO 150°C

PACKAGE INFORMATION

PACKAGE INFORMATION

5 PIN SOT 23 (L)

3 PIN PLASTIC TO-92 (Z)

8 PIN PLASTIC SOIC (S)

ELECTRICAL SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

α

α

α

Vref

Vref dev

Vref

C

T

Vref

T

Vref can b

A

A

=

°











 ×

°

(

)

(

)

25

10

6

∆

∆

Where:

unit is ppm/ C

is the rated operating free air temperature

of the device.

e positive or negative depending on whether

minimum Vref or maximum Vref, respectively occurs at the

lower temperature.

Thedynamic

VKA

IK

When the d

V

I

R

R

impedance when VKA = Vref is defined as :

Zka0

evice is operating with two external

resistors (see Figure 2), the total dynamic impedance

of the circuit is given by:

Zka

Zka0

=

=

=

× +









∆

∆

∆

∆

1

1

2

3

2

1

4

5

TOP VIEW

Anode

Ref

NC

NC

Cathode

1

2

3

BOTTOM VIEW

Ref

Anode

Cathode

4

3

2

1

5

6

7

8

TOP VIEW

NC

NC

Anode

Anode

NC

NC

Ref

Cathode