DS1488 Quad Line Driver IC DS 1488

Description: DS1488 Quad Line Driver IC DS 1488

DS1488 Quad Line Driver July 1999 DS14 88 Quad Line Driver General Description The DS1488 is a quad line driver which converts standard TTL input logic levels through one stage of inversion to output levels which meet EIA Standard RS- 232D and CCITT Recommendation V.24. Features Current limited output : ± 10 mA type Power-off source impedance: 300Ω min Simple.

Features:

• Part: DS1488M
• Category: Interface and Interconnect => RS-232 (EIA-232)
• Title: RS-232 Serial Port
• Description: DS1488 – Quad Line Driver,
• Pin : 14
• Converts Standard TTL Input Logic to RS-232 Output Standards
• Simple Slew Rate Control with External Capacitor
• Flexible Operating Supply Range
• Current Limit Output
• TTL-Input Compatibility
• Power Off Source Impedance 300ohm Minimum

Applications:

By connecting a capacitor to each driver output the slew rate can be controlled utilizing the output current limiting characteristics of the DS1488. For a set slew rate the appropriate capacitor value may be calculated using the following relationship C = ISC (T/V) where C is the required capacitor, ISC is the short circuit current value, and V/T is the slew rate

RS-232C specifies that the output slew rate must not exceed 30V per microsecond. Using the worst case output short circuit current mA in the above equation, calculations result in a required capacitor 400 pF connected to each output. See Typical Performance Characteristics.

Package Include:

• 1 x MT8870D Integrated DTMF Receiver IC