
REF19x Series 
TABLE OF CONTENTS 
Specifications.....................................................................................3
Electrical Characteristics—REF191 @ T
A
 = 25°C....................3
Electrical Characteristics—REF191 @ 40°C ≤ T
A 
≤ +85°C..4
Electrical Characteristics—REF191 @ 40°C ≤ T
A
 ≤+125°C.5
Electrical Characteristics—REF192 @ T
A
 = 25°C....................5
Electrical Characteristics—REF192 @ 40°C ≤ T
A
 ≤ +85°C..6
Electrical Characteristics—REF192 @ 40°C ≤ T
A
 ≤ +125°C 6
Electrical Characteristics—REF193 @ T
A
 = 25°C....................7
Electrical Characteristics—REF193 @ 40°C ≤ T
A
 ≤ +85°C..7
Electrical Characteristics—REF193 @ T
A
 ≤ 40°C ≤ +125°C 8
Electrical Characteristics—REF194 @ T
a
 = 25°C.....................8
Electrical Characteristics—REF194 @ 40°C ≤ T
A
 ≤ +85°C..9
Electrical Characteristics—REF194 @ 40°C ≤ T
A
 ≤ +125°C 9
Electrical Characteristics—REF195 @ T
A
 = 25°C..................10
Electrical Characteristics—REF195 @ 40°C ≤ T
A
 ≤ +85°C 10
Electrical Characteristics—REF195 @ 40°C ≤ T
A
 ≤ +125°C
.......................................................................................................11
Electrical Characteristics—REF196 @ T
A
 = 25°C..................11
Electrical Characteristics—REF196 @ 40°C ≤ T
A
 ≤ +85°C 12
Electrical Characteristics—REF196 @ 40°C ≤ T
A
 ≤ +125°C
.......................................................................................................12
Electrical Characteristics—REF198 @ T
A
 = 25°C..................13
Electrical Characteristics—REF198 @ 40°C ≤ T
A
 ≤ +85°C 13
Electrical Characteristics—REF198 @ 40°C ≤ T
A
 ≤ 
+
125°C
.......................................................................................................14
Rev. I | Page 2 of 28 
Wafer Test Limits........................................................................ 14
Absolute Maximum Ratings ......................................................... 15
Thermal Resistance.................................................................... 15
ESD Caution................................................................................ 15
Typical Performance Characteristics........................................... 16
Applications..................................................................................... 19
Output Short-Circuit Behavior ................................................ 19
Device Power Dissipation Considerations.............................. 19
Output Voltage Bypassing......................................................... 19
Sleep Mode Operation............................................................... 19
Basic Voltage Reference Connections ..................................... 19
Membrane Switch-Controlled Power Supply......................... 19
Current-Boosted References with Current Limiting............. 20
Negative Precision Reference without Precision Resistors... 20
Stacking Reference ICs for Arbitrary Outputs....................... 21
Precision Current Source.......................................................... 21
Switched Output 5 V/3.3 V Reference..................................... 22
Kelvin Connections.................................................................... 22
Fail-Safe 5 V Reference.............................................................. 23
Low Power, Strain Gage Circuit ............................................... 24
Outline Dimensions....................................................................... 25
Ordering Guide .......................................................................... 26
REVISION HISTORY
9/06—Rev. H to Rev. I  
Updated Format..................................................................Universal 
Changes to Table 25 .......................................................................15 
Changes to Figure 6........................................................................16 
Changes to Figure 10, Figure 12, Figure 14, and Figure 16.......17 
Changes to Figure 18......................................................................18 
Changes to Figure 20......................................................................19 
Changes to Figure 23......................................................................20 
Changes to Figure 25......................................................................21 
Updated Outline Dimensions.......................................................25 
Changes to Ordering Guide..........................................................26 
6/05—Rev. G to Rev. H 
Updated Format..................................................................Universal 
Changes to Caption in Figure 7....................................................16 
Updated Outline Dimensions.......................................................25 
Changes to Ordering Guide..........................................................26 
7/04—Rev. F to Rev. G 
Changes to Ordering Guide.............................................................4 
3/04—Rev. E to Rev. F 
Updated Absolute Maximum Rating..............................................4 
Changes to Ordering Guide.......................................................... 14 
Updated Outline Dimensions....................................................... 24 
1/03—Rev. D to Rev. E 
Changes to Figure 3 and Figure 4................................................. 15 
Changes to Output Short Circuit Behavior................................. 17 
Changes to Figure 20...................................................................... 17 
Changes to Figure 24...................................................................... 19 
Updated Outline Dimensions....................................................... 23 
1/96—Revision 0: Initial Version