LC75700T Key Scanning IC Overview The LC75700T is a key scanning LSI that accepts input from up to 30 keys www.onsemi.com and can control up to four general purpose output ports. Therefore it can reduce the number of lines to the front panel in application systems. Features Key input function for up to 30 keys. General-purpose output ports for up to four pins. A key scan is performed only when a key is pressed, and thus power dissipation is reduced. Serial data I/O supports CCB* format communication with the system controller. Switching between the key scan output port and general purpose output TSSOP20 4.4x6.5 / TSSOP20 (225 mil) port functions can be controlled by the control data. The RES pin is provided. This pin disables key scanning, and forces the general-purpose output ports to the low level. RC oscillator circuit ORDERING INFORMATION Device Package Shipping (Qty / Packing) TSSOP20(225mil) LC75700T-MPB-E 70 / Fan-Fold (Pb-Free) TSSOP20(225mil) LC75700T-TLM-E 2000 / Tape &Reel (Pb-Free) TSSOP20(225mil) LC75700TS-MPB-E 70 / Fan-Fold (Pb-Free) TSSOP20(225mil) LC75700TS-TLM-E 2000 / Tape &Reel (Pb-Free) For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. LC75700T Specifications Absolute Maximum Ratings at Ta = 25C, V = 0 V SS Parameter Symbol Conditions Ratings Unit Maximum supply voltage V max V 0.3 to +7.0 V DD DD V 1 CE, CL, DI, RES 0.3 to +7.0 IN Input voltage V V 2 OSC, KI1 to KI5 0.3 to V + 0.3 IN DD V 1 DO 0.3 to +7.0 OUT Output voltage V V 2 OSC, KS1 to KS6, P1 to P4 0.3 to V + 0.3 OUT DD I 1 KS1 to KS6 1 OUT Output current mA I 2 P1 to P4 5 OUT Allowable power dissipation Pd max Ta = 85C 150 mW Operating temperature Topr 40 to +85 C Storage temperature Tstg 50 to +150 C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. Allowable Operating Ranges at Ta = 40 to +85C, V = 0 V SS Ratings Parameter Symbol Conditions Unit min typ max Supply voltage V V 2.7 5.0 5.5 V DD DD V 1 CE, CL, DI, RES 0.8 V 5.5 IH DD Input high level voltage V V 2 KI1 to KI5 0.6 V V IH DD DD Input low level voltage V CE, CL, DI, RES, KI1 to KI5 0 0.2 V V IL DD Recommended external resistance Rosc OSC 39 k Recommended external capacitance Cosc OSC 1000 pF Guaranteed oscillator range fosc OSC 19 38 76 kHz Low level clock pulse width tL CL See figure 1. 160 ns High level clock pulse width tH CL See figure 1. 160 ns Data setup time tds DI, CL See figure 1. 160 ns Data hold time tdh DI, CL See figure 1. 160 ns CE wait time tcp CE, CL See figure 1. 160 ns CE setup time tcs CE, CL See figure 1. 160 ns CE hold time tch CE, CL See figure 1. 160 ns DO output delay time tdc DO R = 4.7 k , C = 10 pF*1 See figure 1. 1.5 s PU L DO rise time tdr DO R = 4.7 k , C = 10 pF*1 See figure 1. 1.5 s PU L Note: *1. Since DO is an open-drain output, these times depend on the values of the pull-up resistor R and the load capacitance C . PU L Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. www.onsemi.com 2