TPS2201DF datasheet(20/23 Pages) TI

20 / 23 page

TPS2201, TPS2201Y

DUAL-SLOT PC CARD POWER-INTERFACE SWITCHES

FOR PARALLEL PCMCIA CONTROLLERS

SLVS094B – AUGUST 1994 – REVISED AUGUST 1995

6–20

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

logic input and outputs (continued)

A_Vpp _PGM

A_Vpp_VCC

A_VCC_3

A_VCC_5

B_Vpp _PGM

B_Vpp_VCC

B_VCC_3

B_VCC_5

Cirrus Logic

CL-PD6720

To CPU

GND

A_VPP_PGM

A_VPP_VCC

A_VCC3

A_VCC5

B_VPP_PGM

B_VPP_VCC

B_VCC3

B_VCC5

APWR_GOOD

TPS2201

Vpp _Valid

BPWR_GOOD

Figure 24. Logic Connections to CL-PD6720

Intel’s 82365SLDF controller uses active-high control logic for VCC selection, which requires connecting the

82365SLDF’s 3-V control outputs (A_VCC_EN0, B_VCCEN0) to the TPS2201’s 5-V control inputs (A_VCC5,

B_VCC5) and the 5-V control outputs (AVCC_EN1, B_VCC_EN1) to the 3-V control inputs (A_VCC3, B_VCC3),

as illustrated in Figure 25. Examination of the control logic tables on page 16 will confirm that these connections

will in fact select the correct output voltage. An alternative approach would be to invert the Intel VCC control logic

signals before routing them to the TPS2201.

The separate Vpp power-good indicators of the TPS2201 can be connected directly to the Intel controller as

shown in Figure 25.

Cirrus Logic defines a (1, 1) on the VCC select lines to be the PC Card no connect state; Intel chose (0, 0) to

select this state. As the tables show, either combination switches the VCC outputs to 0 V. The decision to provide

0 V versus a high impedance for the no connect state eliminates potential charging at the switch-to-card

interface. Feedback from the PC Card design community favors this approach.

Vpp logic allows for 0-V or high-impedance output for no connect (0, 0) or reserved (1, 1) logic inputs, respectively

(refer to AVPP and BVPP control-logic tables on page 16). Both the Cirrus Logic and Intel controllers interface

directly with the Vpp control inputs of the TPS2201.

The shutdown input of the TPS2201, SHDN, when held at a logic low places all VCC and Vpp outputs in a

high-impedance state and reduces chip quiescent current to 1

µA to conserve battery power.

An overcurrent output (OC) is provided to indicate an overcurrent condition in any of the VCC or Vpp supplies

(see discussion above).

ESD protection

All TPS2201 inputs and outputs incorporate ESD-protection circuitry designed to withstand a 2-kV

human-body-model discharge as defined in MIL-STD-883C. The VCC and Vpp outputs can be exposed to

potentially higher discharges from the external environment through the PC card connector. Bypassing the

outputs with 0.1-

µF capacitors protects the devices from discharges up to 10 kV.

TPS2201DF датащи(PDF) 20 Page - Texas Instruments

TPS2201DF датащи(HTML) 20 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

датащи скачать

ссылки URL