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TCM37C14A Datasheet(PDF) 13 Page - Texas Instruments

Part No. TCM37C14A
Description  PCM COMBO WITH PROGRAMMABLE GAIN CONTROL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TCM37C14A Datasheet(HTML) 13 Page - Texas Instruments

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TCM37C14A, TCM37C15A
PCM COMBO WITH PROGRAMMABLE GAIN CONTROL
SLWS018B – JUNE 1996 – REVISED MAY 1998
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
system reliability and design considerations
The TCM37C14A and TCM37C15A system reliability and design considerations are described in the following
paragraphs.
latch-up
Latch-up is possible in all CMOS devices. It is caused by the firing of a parasitic SCR that is present due to the
inherent nature of CMOS. When a latch-up occurs, the device draws excessive amounts of current and will
continue to draw heavy current until power is removed. Latch-up can result in permanent damage to the device
if supply current to the device is not limited.
Even though the devices are heavily protected against latch-up, it is still possible to cause latch-up under certain
conditions in which excess current is forced into or out of one or more terminals. Latch-up can occur when the
positive supply voltage drops momentarily below ground, when the negative supply voltage rises momentarily
above ground, or, possibly, if a signal is applied to a terminal after power has been applied but before the ground
is connected. This can happen if the device is hot inserted into a card with the power applied, or if the device
is mounted on a card that has an edge connector, and the card is hot inserted into a system with the power on.
To help ensure that latch-up does not occur, it is considered good design practice to connect a reverse-biased
Schottky diode with a forward voltage drop of less than or equal to 0.4 V (1N5711 or equivalent) between each
power supply and GND (see Figure 5). If it is possible that a TCM37C14A- or TCM37C15A-equipped card with
an edge connector could be hot inserted into a powered-up system, it is also important to ensure that the ground
edge-connector traces are longer than the power and signal traces, so that the card ground is always the first
to make contact.
VCC
DGND
VBB
Figure 5. Latch-Up Protection Diode Connection


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