SN54LS373-SP Texas instruments

SN54LS373-SP

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SN54LS373-SP

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Описание

These 8-bit registers feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The high-impedance 3-state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pullup components. These devices are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches of the LS373 and S373 are transparent D-type latches, meaning that while the enable (C or CLK) input is high, the Q outputs follow the data (D) inputs. When C or CLK is taken low, the output is latched at the level of the data that was set up. The eight flip-flops of the LS374 and S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the logic states that were set up at the D inputs. Schmitt-trigger buffered inputs at the enable/clock lines of the S373 and S374 devices simplify system design as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered output-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. OC\ does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered, even while the outputs are off.

Choice of Eight Latches or Eight D-Type Flip-Flops in a Single Package
3-State Bus-Driving Outputs
Full Parallel Access for Loading
Buffered Control Inputs
Clock-Enable Input Has Hysteresis to Improve Noise Rejection (’S373 and ’S374)
P-N-P Inputs Reduce DC Loading on Data Lines (’S373 and ’S374)

Number of channels	8
Technology family	LS
Supply voltage (min) (V)	4.75
Supply voltage (max) (V)	5.25
Input type	Bipolar
Output type	3-State
Clock frequency (max) (MHz)	35
IOL (max) (mA)	24
IOH (max) (mA)	-2.6
Supply current (max) (µA)	40000
Features	High speed (tpd 10-50ns)
Operating temperature range (°C)	-55 to 125
Rating	Space