Datasheet
DS1685/DS1687 3V/5V Real-Time Clocks 
2 of 34 
ORDERING INFORMATION 
PART*  TEMP RANGE 
VOLTAGE 
(V) 
PIN-PACKAGE  TOP MARK* 
DS1685-3+  0°C to +70°C  3  24 PDIP (0.600”)  DS1685-3 
DS1685-5+  0°C to +70°C  5  24 PDIP (0.600”)  DS1685-5 
DS1685-5IND+  -40°C to +85°C  5  24 PDIP (0.600”)  DS1685-5 
DS1685E-3+  0°C to +70°C  3  24 TSSOP (0.173”)   DS1685E-3 
DS1685E-5+  0°C to +70°C  5  24 TSSOP (0.173”)  DS1685E 
DS1685EN-3+  -40°C to +85°C  3  24 TSSOP (0.173”)  DS1685E-3 
DS1685EN-5+  -40°C to +85°C  5  24 TSSOP (0.173”)  DS1685E 
DS1685E-3+T&R  0°C to +70°C  3  24 TSSOP (0.173”)/Tape & Reel  DS1685E-3 
DS1685E-5+T&R  0°C to +70°C  5  24 TSSOP (0.173”)/Tape & Reel  DS1685E 
DS1685EN-3+T&R  -40°C to +85°C  3  24 TSSOP (0.173”)/Tape & Reel  DS1685E-3 
DS1685EN-5+T&R  -40°C to +85°C  5  24 TSSOP (0.173”) /T&R  DS1685E 
DS1685Q-3+  0°C to +70°C  3  0B28 PLCC  DS1685Q-3 
DS1685Q-5+  0°C to +70°C  5  28 PLCC  DS1685Q-5 
DS1685QN-3+  -40°C to +85°C  3  28 PLCC  DS1685Q-3 
DS1685QN-5+  -40°C to +85°C  5  28 PLCC  DS1685Q-5 
DS1685Q-3+T&R  0°C to +70°C  3  28 PLCC/Tape & Reel  DS1685Q-3 
DS1685Q-5+T&R  0°C to +70°C  5  28 PLCC/Tape & Reel  DS1685Q-5 
DS1685S-3+  0°C to +70°C  3  24 SO (0.300”)  DS1685S-3 
DS1685S-5+  0°C to +70°C  5  1B24 SO (0.300”)  DS1685S-5 
DS1685S-3+T&R  0°C to +70°C  3  24 SO (0.300”)/Tape & Reel  DS1685S-3 
DS1685S-5+T&R  0°C to +70°C  5  24 SO (0.300”)/Tape & Reel  DS1685S-5 
DS1687
-3+  0°C to +70°C  3  24 EDIP (0.740”)  DS1687-3 
DS1687-5+  0°C to +70°C  5  24 EDIP (0.740”)  DS1687-5 
DS1687-3IND+  -40°C to +85°C  3  24 EDIP (0.740”)  DS1687-3 
DS1687-5IND+  -40°C to +85°C  5  24 EDIP (0.740”)  DS1687-5 
+Denotes a lead(Pb)-free/RoHS-compliant device. A “+” anywhere on the top mark indicates a lead-free/RoHS-compliant device. 
*An “N” or “IND” denotes an industrial temperature grade device. 
TYPICAL OPERATING CIRCUIT 










