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SN74HCS596 Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer SN74HCS596
Bauteilbeschribung  SN74HCS596 8-Bit Shift Register With Schmitt-Trigger Inputs and Open-Drain Output Registers
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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Additionally, the outputs of this device are capable of driving larger currents than the device can sustain without
being damaged. It is important for the output power of the device to be limited to avoid damage due to
overcurrent. The electrical and thermal limits defined in the Absolute Maximum Ratings must be followed at all
times.
When placed into the high-impedance state, the output will neither source nor sink current, with the exception of
minor leakage current as defined in the Electrical Characteristics table. In the high-impedance state, the output
voltage is not controlled by the device and is dependent on external factors. If no other drivers are connected to
the node, then this is known as a floating node and the voltage is unknown. A pull-up resistor can be connected
to the output to provide a known voltage at the output while it is in the high-impedance state. The value of the
resistor will depend on multiple factors, including parasitic capacitance and power consumption limitations.
Typically, a 10 kΩ resistor can be used to meet these requirements.
Unused open-drain CMOS outputs should be left disconnected.
8.3.3 CMOS Schmitt-Trigger Inputs
This device includes inputs with the Schmitt-trigger architecture. These inputs are high impedance and are
typically modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics table
from the input to ground. The worst case resistance is calculated with the maximum input voltage, given in the
Absolute Maximum Ratings table, and the maximum input leakage current, given in the Electrical Characteristics
table, using Ohm's law (R = V ÷ I).
The Schmitt-trigger input architecture provides hysteresis as defined by ΔVT in the Electrical Characteristics
table, which makes this device extremely tolerant to slow or noisy inputs. While the inputs can be driven much
slower than standard CMOS inputs, it is still recommended to properly terminate unused inputs. Driving the
inputs with slow transitioning signals will increase dynamic current consumption of the device. For additional
information regarding Schmitt-trigger inputs, please see Understanding Schmitt Triggers.
8.3.4 Clamp Diode Structure
The inputs and outputs to this device have both positive and negative clamping diodes as depicted in Electrical
Placement of Clamping Diodes for Each Input and Output.
CAUTION
Voltages beyond the values specified in the Absolute Maximum Ratings table can cause damage to
the device. The input and output voltage ratings may be exceeded if the input and output clamp-
current ratings are observed.
GND
Logic
Input
Output
VCC
Device
-IIK
+IIK
+IOK
-IOK
Figure 8-2. Electrical Placement of Clamping Diodes for Each Input and Output
8.4 Device Functional Modes
Function Table lists the functional modes of the SN74HCS596.
www.ti.com
SN74HCS596
SCLS840 – AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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