Catalog > Semiconductors > Integrated Circuits Integrated Circuit Integrated Circuit PSB8591 DTMF CIRCUIT - DUAL TONE MULTI-FREQUENCY GENERATOR 20PIN DIP 58.14 ZAR inc for 1 Each 3 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Specifications Case DIP20 Type SemiConductor Manufacturer Siemens Semiconductors Oper. Temp (°C) Min -20 Oper. Temp (°C) Max. 75 Pinout Equivalence Number 20-97 No. of Pins 20 Surface Mounted Yes/No NO