G574SA データシートの表示（PDF） - Global Mixed-mode Technology Inc
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G574SA Datasheet PDF : 16 Pages
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Global Mixed-mode Technology Inc.
G574
During power up, the G574 controls the rise time of
the VCC and VPP outputs and limits the current into a
faulty card or connector. If a short circuit is applied
after power is established (e.g., hot insertion of a bad
card), current is initially limited only by the impedance
between the short and the power supply. In extreme
cases, as much as 10A to 15A may flow into the short
before the current limiting of the G574 engages. If the
VCC or VPP outputs are driven below ground, the G574
may latch nondestructively in an off state. Cycling
power will reestablish normal operation.
Overcurrent limiting for the VCC outputs is designed to
activate, if powered up, into a short in the range of
0.8A to 2.2A. The VPP outputs limit from 120mA to
450mA. The protection circuitry acts by linearly limiting
the current passing through the switch rather than ini-
tiating a full shutdown of the supply. Shutdown occurs
only during thermal limiting.
Thermal limiting prevents destruction of the IC from
overheating if the package power-dissipation ratings are
exceeded. Thermal limiting disables all power outputs
(both A and B slots) until the device has cooled.
Logic Input and Outputs
The serial interface consists of DATA, CLOCK, and
LATCH leads. The data is clocked in on the positive
leading edge of the clock (see Figure 2 and 3 ). The bit
(D0 through D10 serial data word is loaded during the
positive edge of the latch signal. The latch signal
should occur before the next positive leading edge of
the block.
The shutdown bit of the data word places all VCC and
VPP outputs in a high-impedance state and reduces
chip quiescent current to 2µA to conserve battery
power.
The G574 serial interface is designed to be compatible
with serial-interface PCMCIA controllers and current
PCMCIA and Japan Electronic Industry Development
Association (JEIDA) standards.
An overcurrent output ( OC ) is provided to indicate an
overcurrent condition in any of the VCC or VPP outputs
as previously discussed.
Functional Block Diagram
G574
15
3.3V
3.3V 16
3.3V 17
1
5V
2
5V
30
5V
7
12V
12V 24
29
19
3
4
5
6
14
18
S1
S2
CS
S3
CS
S4
S5
CS
S6
CS
S7
S8
CS
S9
CS
S10
CS
S11
S12
CS
S13
CS
S14
CS
9 AVCC
10 AVCC
11 AVCC
8 AVPP
20
BVCC
21 BVCC
22 BVCC
23
BVPP
Internal
Current Monitor
MODE
STBY
DATA
CLOCK
LATCH
RESET
RESET
OC
GND
T h e rm a l
12
Both 12V pins m ust be connected together.
Ver: 1.2
Jul 28, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
13
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