MAXIM MAX613CPD

The MAX613/MAX614 contain switches for the VPP supply-voltage lines for Personal Computer Memory Card International Association (PCMCIA) Release 2.0 card slots. These ICs also contain level-translator outputs to switch the PCMCIA card VCC. The MAX613 allows digital control of two separate VPP lines that can be switched between 0V, VCC, +12V, and high impedance. It also includes level shifters that allow the control of N-channel power MOSFETs for connecting and disconnecting the slot VCC supply voltage. The MAX614 controls a single VPP supply-voltage line and includes one level shifter in an 8-pin package. The MAX613/MAX614 allow simple switching of PCMCIA card VPP to 0V, +5V, and +12V. On-chip power MOSFETs connect AVPP and BVPP to either GND, VCCIN, or VPPIN. The AVPP0 and AVPP1 control logic inputs determine AVPP’s state. Likewise, BVPP0 and BVPP1 control BVPP. AVPP and BVPP can also be programmed to be high impedance. Each PCMCIA card slot has two VPP voltage inputs labeled VPP1 and VPP2. Typically, VPP1 supplies the flash chips that store the low-order byte of the 16-bit words, and VPP2 supplies the chips that contain the high-order byte. Programming the high-order bytes separately from the low-order bytes may be necessary to minimize +12V current consumption. A single 8-bit flash chip typically requires at most 30mA of +12V VPP current during erase or programming. Thus, systems with less than 60mA current capability from +12V cannot program two 8-bit flash chips simultaneously, and need separate controls for VPP1 and VPP2. Use the MAX614 for single-slot applications that do not require a separate VPP1 and VPP2. To prevent VPP overshoot resulting from parasitic inductance in the +12V supply, the VPPIN bypass capacitor’s value must be at least 10 times greater than the capacitance from AVPP or BVPP to GND; the AVPP and BVPP bypass capacitors must be at least 0.01μF. The MAX613/MAX614 contain level shifters that simplify driving external power MOSFETs to switch PCMCIA card VCC. While a PCMCIA card is being inserted into the socket, the VCC pins on the card edge connector should be powered down to 0V to prevent “hot insertion” that may damage the PCMCIA card. The MAX613/MAX614 MOSFET drivers are open drain. Their rise time is controlled by an external pull-up resistor, allowing slow turnon of VCC power to the PCMCIA card.

• Logic Compatible with Industry-Standard PCMCIA Digital Controllers: Intel 82365SL, Intel 82365SL DF, Vadem VG-365, Vadem VG-465, Vadem VG-468, Cirrus Logic CL-PD6710, Cirrus Logic CL-PD6720
• 0V/VCC/+12V/High-Impedance VPP Outputs
• Internal 1.6Ω VPP Power Switches
• 10μA Quiescent Supply Current
• Break-Before-Make Switching
• VCC Switch Control

• Notebook and Palmtop Computers
• Personal Organizers
• Digital Cameras
• Handiterminals
• Bar-Code Readers